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_PUSH_PENDING 6 95 #define MPTCP_CLEAN_UNA 7 96 97 static inline bool before64(__u64 seq1, __u64 seq2) 98 { 99 return (__s64)(seq1 - seq2) < 0; 100 } 101 102 #define after64(seq2, seq1) before64(seq1, seq2) 103 104 struct mptcp_options_received { 105 u64 sndr_key; 106 u64 rcvr_key; 107 u64 data_ack; 108 u64 data_seq; 109 u32 subflow_seq; 110 u16 data_len; 111 u16 mp_capable : 1, 112 mp_join : 1, 113 dss : 1, 114 add_addr : 1, 115 rm_addr : 1, 116 family : 4, 117 echo : 1, 118 backup : 1; 119 u32 token; 120 u32 nonce; 121 u64 thmac; 122 u8 hmac[20]; 123 u8 join_id; 124 u8 use_map:1, 125 dsn64:1, 126 data_fin:1, 127 use_ack:1, 128 ack64:1, 129 mpc_map:1, 130 __unused:2; 131 u8 addr_id; 132 u8 rm_id; 133 union { 134 struct in_addr addr; 135 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 136 struct in6_addr addr6; 137 #endif 138 }; 139 u64 ahmac; 140 u16 port; 141 }; 142 143 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 144 { 145 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 146 ((nib & 0xF) << 8) | field); 147 } 148 149 struct mptcp_addr_info { 150 sa_family_t family; 151 __be16 port; 152 u8 id; 153 u8 flags; 154 int ifindex; 155 union { 156 struct in_addr addr; 157 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 158 struct in6_addr addr6; 159 #endif 160 }; 161 }; 162 163 enum mptcp_pm_status { 164 MPTCP_PM_ADD_ADDR_RECEIVED, 165 MPTCP_PM_ADD_ADDR_SEND_ACK, 166 MPTCP_PM_RM_ADDR_RECEIVED, 167 MPTCP_PM_ESTABLISHED, 168 MPTCP_PM_SUBFLOW_ESTABLISHED, 169 }; 170 171 enum mptcp_add_addr_status { 172 MPTCP_ADD_ADDR_SIGNAL, 173 MPTCP_ADD_ADDR_ECHO, 174 MPTCP_ADD_ADDR_IPV6, 175 }; 176 177 struct mptcp_pm_data { 178 struct mptcp_addr_info local; 179 struct mptcp_addr_info remote; 180 struct list_head anno_list; 181 182 spinlock_t lock; /*protects the whole PM data */ 183 184 u8 add_addr_signal; 185 bool rm_addr_signal; 186 bool server_side; 187 bool work_pending; 188 bool accept_addr; 189 bool accept_subflow; 190 u8 add_addr_signaled; 191 u8 add_addr_accepted; 192 u8 local_addr_used; 193 u8 subflows; 194 u8 add_addr_signal_max; 195 u8 add_addr_accept_max; 196 u8 local_addr_max; 197 u8 subflows_max; 198 u8 status; 199 u8 rm_id; 200 }; 201 202 struct mptcp_data_frag { 203 struct list_head list; 204 u64 data_seq; 205 u16 data_len; 206 u16 offset; 207 u16 overhead; 208 u16 already_sent; 209 struct page *page; 210 }; 211 212 /* MPTCP connection sock */ 213 struct mptcp_sock { 214 /* inet_connection_sock must be the first member */ 215 struct inet_connection_sock sk; 216 u64 local_key; 217 u64 remote_key; 218 u64 write_seq; 219 u64 snd_nxt; 220 u64 ack_seq; 221 u64 rcv_wnd_sent; 222 u64 rcv_data_fin_seq; 223 int wmem_reserved; 224 struct sock *last_snd; 225 int snd_burst; 226 int old_wspace; 227 u64 snd_una; 228 u64 wnd_end; 229 unsigned long timer_ival; 230 u32 token; 231 int rmem_pending; 232 int rmem_released; 233 unsigned long flags; 234 bool can_ack; 235 bool fully_established; 236 bool rcv_data_fin; 237 bool snd_data_fin_enable; 238 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 239 spinlock_t join_list_lock; 240 struct sock *ack_hint; 241 struct work_struct work; 242 struct sk_buff *ooo_last_skb; 243 struct rb_root out_of_order_queue; 244 struct sk_buff_head receive_queue; 245 struct sk_buff_head skb_tx_cache; /* this is wmem accounted */ 246 int tx_pending_data; 247 int size_goal_cache; 248 struct list_head conn_list; 249 struct list_head rtx_queue; 250 struct mptcp_data_frag *first_pending; 251 struct list_head join_list; 252 struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 253 struct sock *first; 254 struct mptcp_pm_data pm; 255 struct { 256 u32 space; /* bytes copied in last measurement window */ 257 u32 copied; /* bytes copied in this measurement window */ 258 u64 time; /* start time of measurement window */ 259 u64 rtt_us; /* last maximum rtt of subflows */ 260 } rcvq_space; 261 }; 262 263 #define mptcp_lock_sock(___sk, cb) do { \ 264 struct sock *__sk = (___sk); /* silence macro reuse warning */ \ 265 might_sleep(); \ 266 spin_lock_bh(&__sk->sk_lock.slock); \ 267 if (__sk->sk_lock.owned) \ 268 __lock_sock(__sk); \ 269 cb; \ 270 __sk->sk_lock.owned = 1; \ 271 spin_unlock(&__sk->sk_lock.slock); \ 272 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \ 273 local_bh_enable(); \ 274 } while (0) 275 276 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 277 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 278 279 #define mptcp_for_each_subflow(__msk, __subflow) \ 280 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 281 282 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) 283 { 284 return (struct mptcp_sock *)sk; 285 } 286 287 static inline int __mptcp_space(const struct sock *sk) 288 { 289 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_pending); 290 } 291 292 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 293 { 294 const struct mptcp_sock *msk = mptcp_sk(sk); 295 296 return READ_ONCE(msk->first_pending); 297 } 298 299 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 300 { 301 struct mptcp_sock *msk = mptcp_sk(sk); 302 struct mptcp_data_frag *cur; 303 304 cur = msk->first_pending; 305 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 306 list_next_entry(cur, list); 307 } 308 309 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 310 { 311 struct mptcp_sock *msk = mptcp_sk(sk); 312 313 if (!msk->first_pending) 314 return NULL; 315 316 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 317 return NULL; 318 319 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 320 } 321 322 static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk) 323 { 324 struct mptcp_sock *msk = mptcp_sk(sk); 325 326 if (!before64(msk->snd_nxt, READ_ONCE(msk->snd_una))) 327 return NULL; 328 329 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 330 } 331 332 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) 333 { 334 struct mptcp_sock *msk = mptcp_sk(sk); 335 336 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 337 } 338 339 struct mptcp_subflow_request_sock { 340 struct tcp_request_sock sk; 341 u16 mp_capable : 1, 342 mp_join : 1, 343 backup : 1; 344 u8 local_id; 345 u8 remote_id; 346 u64 local_key; 347 u64 idsn; 348 u32 token; 349 u32 ssn_offset; 350 u64 thmac; 351 u32 local_nonce; 352 u32 remote_nonce; 353 struct mptcp_sock *msk; 354 struct hlist_nulls_node token_node; 355 }; 356 357 static inline struct mptcp_subflow_request_sock * 358 mptcp_subflow_rsk(const struct request_sock *rsk) 359 { 360 return (struct mptcp_subflow_request_sock *)rsk; 361 } 362 363 enum mptcp_data_avail { 364 MPTCP_SUBFLOW_NODATA, 365 MPTCP_SUBFLOW_DATA_AVAIL, 366 MPTCP_SUBFLOW_OOO_DATA 367 }; 368 369 /* MPTCP subflow context */ 370 struct mptcp_subflow_context { 371 struct list_head node;/* conn_list of subflows */ 372 u64 local_key; 373 u64 remote_key; 374 u64 idsn; 375 u64 map_seq; 376 u32 snd_isn; 377 u32 token; 378 u32 rel_write_seq; 379 u32 map_subflow_seq; 380 u32 ssn_offset; 381 u32 map_data_len; 382 u32 request_mptcp : 1, /* send MP_CAPABLE */ 383 request_join : 1, /* send MP_JOIN */ 384 request_bkup : 1, 385 mp_capable : 1, /* remote is MPTCP capable */ 386 mp_join : 1, /* remote is JOINing */ 387 fully_established : 1, /* path validated */ 388 pm_notified : 1, /* PM hook called for established status */ 389 conn_finished : 1, 390 map_valid : 1, 391 mpc_map : 1, 392 backup : 1, 393 rx_eof : 1, 394 can_ack : 1, /* only after processing the remote a key */ 395 disposable : 1; /* ctx can be free at ulp release time */ 396 enum mptcp_data_avail data_avail; 397 u32 remote_nonce; 398 u64 thmac; 399 u32 local_nonce; 400 u32 remote_token; 401 u8 hmac[MPTCPOPT_HMAC_LEN]; 402 u8 local_id; 403 u8 remote_id; 404 405 struct sock *tcp_sock; /* tcp sk backpointer */ 406 struct sock *conn; /* parent mptcp_sock */ 407 const struct inet_connection_sock_af_ops *icsk_af_ops; 408 void (*tcp_data_ready)(struct sock *sk); 409 void (*tcp_state_change)(struct sock *sk); 410 void (*tcp_write_space)(struct sock *sk); 411 412 struct rcu_head rcu; 413 }; 414 415 static inline struct mptcp_subflow_context * 416 mptcp_subflow_ctx(const struct sock *sk) 417 { 418 struct inet_connection_sock *icsk = inet_csk(sk); 419 420 /* Use RCU on icsk_ulp_data only for sock diag code */ 421 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 422 } 423 424 static inline struct sock * 425 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 426 { 427 return subflow->tcp_sock; 428 } 429 430 static inline u64 431 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 432 { 433 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 434 subflow->ssn_offset - 435 subflow->map_subflow_seq; 436 } 437 438 static inline u64 439 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 440 { 441 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 442 } 443 444 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, 445 struct mptcp_subflow_context *subflow) 446 { 447 sock_hold(mptcp_subflow_tcp_sock(subflow)); 448 spin_lock_bh(&msk->join_list_lock); 449 list_add_tail(&subflow->node, &msk->join_list); 450 spin_unlock_bh(&msk->join_list_lock); 451 } 452 453 int mptcp_is_enabled(struct net *net); 454 unsigned int mptcp_get_add_addr_timeout(struct net *net); 455 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 456 struct mptcp_options_received *mp_opt); 457 bool mptcp_subflow_data_available(struct sock *sk); 458 void __init mptcp_subflow_init(void); 459 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 460 void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, 461 struct mptcp_subflow_context *subflow); 462 void mptcp_subflow_reset(struct sock *ssk); 463 464 /* called with sk socket lock held */ 465 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 466 const struct mptcp_addr_info *remote); 467 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 468 469 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 470 struct mptcp_subflow_context *ctx) 471 { 472 sk->sk_data_ready = ctx->tcp_data_ready; 473 sk->sk_state_change = ctx->tcp_state_change; 474 sk->sk_write_space = ctx->tcp_write_space; 475 476 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 477 } 478 479 void __init mptcp_proto_init(void); 480 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 481 int __init mptcp_proto_v6_init(void); 482 #endif 483 484 struct sock *mptcp_sk_clone(const struct sock *sk, 485 const struct mptcp_options_received *mp_opt, 486 struct request_sock *req); 487 void mptcp_get_options(const struct sk_buff *skb, 488 struct mptcp_options_received *mp_opt); 489 490 void mptcp_finish_connect(struct sock *sk); 491 static inline bool mptcp_is_fully_established(struct sock *sk) 492 { 493 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 494 READ_ONCE(mptcp_sk(sk)->fully_established); 495 } 496 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 497 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 498 bool mptcp_finish_join(struct sock *sk); 499 bool mptcp_schedule_work(struct sock *sk); 500 void __mptcp_wnd_updated(struct sock *sk, struct sock *ssk); 501 void __mptcp_data_acked(struct sock *sk); 502 void mptcp_subflow_eof(struct sock *sk); 503 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 504 void __mptcp_flush_join_list(struct mptcp_sock *msk); 505 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 506 { 507 return READ_ONCE(msk->snd_data_fin_enable) && 508 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 509 } 510 511 void mptcp_destroy_common(struct mptcp_sock *msk); 512 513 void __init mptcp_token_init(void); 514 static inline void mptcp_token_init_request(struct request_sock *req) 515 { 516 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 517 } 518 519 int mptcp_token_new_request(struct request_sock *req); 520 void mptcp_token_destroy_request(struct request_sock *req); 521 int mptcp_token_new_connect(struct sock *sk); 522 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 523 struct mptcp_sock *msk); 524 bool mptcp_token_exists(u32 token); 525 struct mptcp_sock *mptcp_token_get_sock(u32 token); 526 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 527 long *s_num); 528 void mptcp_token_destroy(struct mptcp_sock *msk); 529 530 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 531 532 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 533 534 void __init mptcp_pm_init(void); 535 void mptcp_pm_data_init(struct mptcp_sock *msk); 536 void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side); 537 void mptcp_pm_fully_established(struct mptcp_sock *msk); 538 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 539 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 540 void mptcp_pm_subflow_established(struct mptcp_sock *msk, 541 struct mptcp_subflow_context *subflow); 542 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); 543 void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 544 const struct mptcp_addr_info *addr); 545 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 546 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id); 547 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 548 struct mptcp_pm_add_entry * 549 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 550 struct mptcp_addr_info *addr); 551 552 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 553 const struct mptcp_addr_info *addr, 554 bool echo); 555 int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id); 556 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id); 557 558 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 559 { 560 return READ_ONCE(msk->pm.add_addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 561 } 562 563 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 564 { 565 return READ_ONCE(msk->pm.add_addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 566 } 567 568 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk) 569 { 570 return READ_ONCE(msk->pm.add_addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6); 571 } 572 573 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 574 { 575 return READ_ONCE(msk->pm.rm_addr_signal); 576 } 577 578 static inline unsigned int mptcp_add_addr_len(int family, bool echo) 579 { 580 if (family == AF_INET) 581 return echo ? TCPOLEN_MPTCP_ADD_ADDR_BASE 582 : TCPOLEN_MPTCP_ADD_ADDR; 583 return echo ? TCPOLEN_MPTCP_ADD_ADDR6_BASE : TCPOLEN_MPTCP_ADD_ADDR6; 584 } 585 586 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 587 struct mptcp_addr_info *saddr, bool *echo); 588 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 589 u8 *rm_id); 590 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 591 592 void __init mptcp_pm_nl_init(void); 593 void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 594 void mptcp_pm_nl_fully_established(struct mptcp_sock *msk); 595 void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk); 596 void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk); 597 void mptcp_pm_nl_add_addr_send_ack(struct mptcp_sock *msk); 598 void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk); 599 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id); 600 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 601 602 static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb) 603 { 604 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 605 } 606 607 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 608 609 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 610 { 611 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 612 } 613 614 static inline bool mptcp_check_fallback(const struct sock *sk) 615 { 616 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 617 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 618 619 return __mptcp_check_fallback(msk); 620 } 621 622 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 623 { 624 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 625 pr_debug("TCP fallback already done (msk=%p)", msk); 626 return; 627 } 628 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 629 } 630 631 static inline void mptcp_do_fallback(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 __mptcp_do_fallback(msk); 637 } 638 639 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 640 641 static inline bool subflow_simultaneous_connect(struct sock *sk) 642 { 643 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 644 struct sock *parent = subflow->conn; 645 646 return sk->sk_state == TCP_ESTABLISHED && 647 !mptcp_sk(parent)->pm.server_side && 648 !subflow->conn_finished; 649 } 650 651 #ifdef CONFIG_SYN_COOKIES 652 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 653 struct sk_buff *skb); 654 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 655 struct sk_buff *skb); 656 void __init mptcp_join_cookie_init(void); 657 #else 658 static inline void 659 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 660 struct sk_buff *skb) {} 661 static inline bool 662 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 663 struct sk_buff *skb) 664 { 665 return false; 666 } 667 668 static inline void mptcp_join_cookie_init(void) {} 669 #endif 670 671 #endif /* __MPTCP_PROTOCOL_H */ 672