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 20 53 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 54 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 12 55 #define TCPOLEN_MPTCP_ADD_ADDR6 28 56 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 32 57 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 58 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 24 59 #define TCPOLEN_MPTCP_PORT_LEN 4 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_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 169 MPTCP_PM_SUBFLOW_ESTABLISHED, 170 }; 171 172 enum mptcp_addr_signal_status { 173 MPTCP_ADD_ADDR_SIGNAL, 174 MPTCP_ADD_ADDR_ECHO, 175 MPTCP_ADD_ADDR_IPV6, 176 MPTCP_ADD_ADDR_PORT, 177 MPTCP_RM_ADDR_SIGNAL, 178 }; 179 180 struct mptcp_pm_data { 181 struct mptcp_addr_info local; 182 struct mptcp_addr_info remote; 183 struct list_head anno_list; 184 185 spinlock_t lock; /*protects the whole PM data */ 186 187 u8 addr_signal; 188 bool server_side; 189 bool work_pending; 190 bool accept_addr; 191 bool accept_subflow; 192 u8 add_addr_signaled; 193 u8 add_addr_accepted; 194 u8 local_addr_used; 195 u8 subflows; 196 u8 add_addr_signal_max; 197 u8 add_addr_accept_max; 198 u8 local_addr_max; 199 u8 subflows_max; 200 u8 status; 201 u8 rm_id; 202 }; 203 204 struct mptcp_data_frag { 205 struct list_head list; 206 u64 data_seq; 207 u16 data_len; 208 u16 offset; 209 u16 overhead; 210 u16 already_sent; 211 struct page *page; 212 }; 213 214 /* MPTCP connection sock */ 215 struct mptcp_sock { 216 /* inet_connection_sock must be the first member */ 217 struct inet_connection_sock sk; 218 u64 local_key; 219 u64 remote_key; 220 u64 write_seq; 221 u64 snd_nxt; 222 u64 ack_seq; 223 u64 rcv_wnd_sent; 224 u64 rcv_data_fin_seq; 225 int wmem_reserved; 226 struct sock *last_snd; 227 int snd_burst; 228 int old_wspace; 229 u64 snd_una; 230 u64 wnd_end; 231 unsigned long timer_ival; 232 u32 token; 233 int rmem_pending; 234 int rmem_released; 235 unsigned long flags; 236 bool can_ack; 237 bool fully_established; 238 bool rcv_data_fin; 239 bool snd_data_fin_enable; 240 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 241 spinlock_t join_list_lock; 242 struct sock *ack_hint; 243 struct work_struct work; 244 struct sk_buff *ooo_last_skb; 245 struct rb_root out_of_order_queue; 246 struct sk_buff_head receive_queue; 247 struct sk_buff_head skb_tx_cache; /* this is wmem accounted */ 248 int tx_pending_data; 249 int size_goal_cache; 250 struct list_head conn_list; 251 struct list_head rtx_queue; 252 struct mptcp_data_frag *first_pending; 253 struct list_head join_list; 254 struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 255 struct sock *first; 256 struct mptcp_pm_data pm; 257 struct { 258 u32 space; /* bytes copied in last measurement window */ 259 u32 copied; /* bytes copied in this measurement window */ 260 u64 time; /* start time of measurement window */ 261 u64 rtt_us; /* last maximum rtt of subflows */ 262 } rcvq_space; 263 }; 264 265 #define mptcp_lock_sock(___sk, cb) do { \ 266 struct sock *__sk = (___sk); /* silence macro reuse warning */ \ 267 might_sleep(); \ 268 spin_lock_bh(&__sk->sk_lock.slock); \ 269 if (__sk->sk_lock.owned) \ 270 __lock_sock(__sk); \ 271 cb; \ 272 __sk->sk_lock.owned = 1; \ 273 spin_unlock(&__sk->sk_lock.slock); \ 274 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \ 275 local_bh_enable(); \ 276 } while (0) 277 278 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 279 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 280 281 #define mptcp_for_each_subflow(__msk, __subflow) \ 282 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 283 284 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) 285 { 286 return (struct mptcp_sock *)sk; 287 } 288 289 static inline int __mptcp_space(const struct sock *sk) 290 { 291 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_pending); 292 } 293 294 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 295 { 296 const struct mptcp_sock *msk = mptcp_sk(sk); 297 298 return READ_ONCE(msk->first_pending); 299 } 300 301 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 302 { 303 struct mptcp_sock *msk = mptcp_sk(sk); 304 struct mptcp_data_frag *cur; 305 306 cur = msk->first_pending; 307 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 308 list_next_entry(cur, list); 309 } 310 311 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 312 { 313 struct mptcp_sock *msk = mptcp_sk(sk); 314 315 if (!msk->first_pending) 316 return NULL; 317 318 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 319 return NULL; 320 321 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 322 } 323 324 static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk) 325 { 326 struct mptcp_sock *msk = mptcp_sk(sk); 327 328 if (!before64(msk->snd_nxt, READ_ONCE(msk->snd_una))) 329 return NULL; 330 331 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 332 } 333 334 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) 335 { 336 struct mptcp_sock *msk = mptcp_sk(sk); 337 338 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 339 } 340 341 struct mptcp_subflow_request_sock { 342 struct tcp_request_sock sk; 343 u16 mp_capable : 1, 344 mp_join : 1, 345 backup : 1; 346 u8 local_id; 347 u8 remote_id; 348 u64 local_key; 349 u64 idsn; 350 u32 token; 351 u32 ssn_offset; 352 u64 thmac; 353 u32 local_nonce; 354 u32 remote_nonce; 355 struct mptcp_sock *msk; 356 struct hlist_nulls_node token_node; 357 }; 358 359 static inline struct mptcp_subflow_request_sock * 360 mptcp_subflow_rsk(const struct request_sock *rsk) 361 { 362 return (struct mptcp_subflow_request_sock *)rsk; 363 } 364 365 enum mptcp_data_avail { 366 MPTCP_SUBFLOW_NODATA, 367 MPTCP_SUBFLOW_DATA_AVAIL, 368 MPTCP_SUBFLOW_OOO_DATA 369 }; 370 371 /* MPTCP subflow context */ 372 struct mptcp_subflow_context { 373 struct list_head node;/* conn_list of subflows */ 374 u64 local_key; 375 u64 remote_key; 376 u64 idsn; 377 u64 map_seq; 378 u32 snd_isn; 379 u32 token; 380 u32 rel_write_seq; 381 u32 map_subflow_seq; 382 u32 ssn_offset; 383 u32 map_data_len; 384 u32 request_mptcp : 1, /* send MP_CAPABLE */ 385 request_join : 1, /* send MP_JOIN */ 386 request_bkup : 1, 387 mp_capable : 1, /* remote is MPTCP capable */ 388 mp_join : 1, /* remote is JOINing */ 389 fully_established : 1, /* path validated */ 390 pm_notified : 1, /* PM hook called for established status */ 391 conn_finished : 1, 392 map_valid : 1, 393 mpc_map : 1, 394 backup : 1, 395 rx_eof : 1, 396 can_ack : 1, /* only after processing the remote a key */ 397 disposable : 1; /* ctx can be free at ulp release time */ 398 enum mptcp_data_avail data_avail; 399 u32 remote_nonce; 400 u64 thmac; 401 u32 local_nonce; 402 u32 remote_token; 403 u8 hmac[MPTCPOPT_HMAC_LEN]; 404 u8 local_id; 405 u8 remote_id; 406 407 struct sock *tcp_sock; /* tcp sk backpointer */ 408 struct sock *conn; /* parent mptcp_sock */ 409 const struct inet_connection_sock_af_ops *icsk_af_ops; 410 void (*tcp_data_ready)(struct sock *sk); 411 void (*tcp_state_change)(struct sock *sk); 412 void (*tcp_write_space)(struct sock *sk); 413 414 struct rcu_head rcu; 415 }; 416 417 static inline struct mptcp_subflow_context * 418 mptcp_subflow_ctx(const struct sock *sk) 419 { 420 struct inet_connection_sock *icsk = inet_csk(sk); 421 422 /* Use RCU on icsk_ulp_data only for sock diag code */ 423 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 424 } 425 426 static inline struct sock * 427 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 428 { 429 return subflow->tcp_sock; 430 } 431 432 static inline u64 433 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 434 { 435 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 436 subflow->ssn_offset - 437 subflow->map_subflow_seq; 438 } 439 440 static inline u64 441 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 442 { 443 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 444 } 445 446 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, 447 struct mptcp_subflow_context *subflow) 448 { 449 sock_hold(mptcp_subflow_tcp_sock(subflow)); 450 spin_lock_bh(&msk->join_list_lock); 451 list_add_tail(&subflow->node, &msk->join_list); 452 spin_unlock_bh(&msk->join_list_lock); 453 } 454 455 int mptcp_is_enabled(struct net *net); 456 unsigned int mptcp_get_add_addr_timeout(struct net *net); 457 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 458 struct mptcp_options_received *mp_opt); 459 bool mptcp_subflow_data_available(struct sock *sk); 460 void __init mptcp_subflow_init(void); 461 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 462 void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, 463 struct mptcp_subflow_context *subflow); 464 void mptcp_subflow_reset(struct sock *ssk); 465 466 /* called with sk socket lock held */ 467 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 468 const struct mptcp_addr_info *remote); 469 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 470 471 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 472 struct mptcp_subflow_context *ctx) 473 { 474 sk->sk_data_ready = ctx->tcp_data_ready; 475 sk->sk_state_change = ctx->tcp_state_change; 476 sk->sk_write_space = ctx->tcp_write_space; 477 478 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 479 } 480 481 void __init mptcp_proto_init(void); 482 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 483 int __init mptcp_proto_v6_init(void); 484 #endif 485 486 struct sock *mptcp_sk_clone(const struct sock *sk, 487 const struct mptcp_options_received *mp_opt, 488 struct request_sock *req); 489 void mptcp_get_options(const struct sk_buff *skb, 490 struct mptcp_options_received *mp_opt); 491 492 void mptcp_finish_connect(struct sock *sk); 493 static inline bool mptcp_is_fully_established(struct sock *sk) 494 { 495 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 496 READ_ONCE(mptcp_sk(sk)->fully_established); 497 } 498 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 499 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 500 bool mptcp_finish_join(struct sock *sk); 501 bool mptcp_schedule_work(struct sock *sk); 502 void __mptcp_wnd_updated(struct sock *sk, struct sock *ssk); 503 void __mptcp_data_acked(struct sock *sk); 504 void mptcp_subflow_eof(struct sock *sk); 505 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 506 void __mptcp_flush_join_list(struct mptcp_sock *msk); 507 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 508 { 509 return READ_ONCE(msk->snd_data_fin_enable) && 510 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 511 } 512 513 void mptcp_destroy_common(struct mptcp_sock *msk); 514 515 void __init mptcp_token_init(void); 516 static inline void mptcp_token_init_request(struct request_sock *req) 517 { 518 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 519 } 520 521 int mptcp_token_new_request(struct request_sock *req); 522 void mptcp_token_destroy_request(struct request_sock *req); 523 int mptcp_token_new_connect(struct sock *sk); 524 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 525 struct mptcp_sock *msk); 526 bool mptcp_token_exists(u32 token); 527 struct mptcp_sock *mptcp_token_get_sock(u32 token); 528 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 529 long *s_num); 530 void mptcp_token_destroy(struct mptcp_sock *msk); 531 532 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 533 534 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 535 536 void __init mptcp_pm_init(void); 537 void mptcp_pm_data_init(struct mptcp_sock *msk); 538 void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side); 539 void mptcp_pm_fully_established(struct mptcp_sock *msk); 540 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 541 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 542 void mptcp_pm_subflow_established(struct mptcp_sock *msk, 543 struct mptcp_subflow_context *subflow); 544 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); 545 void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 546 const struct mptcp_addr_info *addr); 547 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 548 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id); 549 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 550 struct mptcp_pm_add_entry * 551 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 552 struct mptcp_addr_info *addr); 553 554 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 555 const struct mptcp_addr_info *addr, 556 bool echo, bool port); 557 int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id); 558 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id); 559 560 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 561 { 562 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 563 } 564 565 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 566 { 567 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 568 } 569 570 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk) 571 { 572 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6); 573 } 574 575 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk) 576 { 577 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT); 578 } 579 580 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 581 { 582 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 583 } 584 585 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 586 { 587 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 588 589 if (family == AF_INET6) 590 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 591 if (!echo) 592 len += MPTCPOPT_THMAC_LEN; 593 if (port) 594 len += TCPOLEN_MPTCP_PORT_LEN; 595 596 return len; 597 } 598 599 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 600 struct mptcp_addr_info *saddr, bool *echo, bool *port); 601 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 602 u8 *rm_id); 603 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 604 605 void __init mptcp_pm_nl_init(void); 606 void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 607 void mptcp_pm_nl_fully_established(struct mptcp_sock *msk); 608 void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk); 609 void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk); 610 void mptcp_pm_nl_add_addr_send_ack(struct mptcp_sock *msk); 611 void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk); 612 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id); 613 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 614 615 static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb) 616 { 617 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 618 } 619 620 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 621 622 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 623 { 624 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 625 } 626 627 static inline bool mptcp_check_fallback(const struct sock *sk) 628 { 629 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 630 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 631 632 return __mptcp_check_fallback(msk); 633 } 634 635 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 636 { 637 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 638 pr_debug("TCP fallback already done (msk=%p)", msk); 639 return; 640 } 641 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 642 } 643 644 static inline void mptcp_do_fallback(struct sock *sk) 645 { 646 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 647 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 648 649 __mptcp_do_fallback(msk); 650 } 651 652 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 653 654 static inline bool subflow_simultaneous_connect(struct sock *sk) 655 { 656 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 657 struct sock *parent = subflow->conn; 658 659 return sk->sk_state == TCP_ESTABLISHED && 660 !mptcp_sk(parent)->pm.server_side && 661 !subflow->conn_finished; 662 } 663 664 #ifdef CONFIG_SYN_COOKIES 665 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 666 struct sk_buff *skb); 667 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 668 struct sk_buff *skb); 669 void __init mptcp_join_cookie_init(void); 670 #else 671 static inline void 672 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 673 struct sk_buff *skb) {} 674 static inline bool 675 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 676 struct sk_buff *skb) 677 { 678 return false; 679 } 680 681 static inline void mptcp_join_cookie_init(void) {} 682 #endif 683 684 #endif /* __MPTCP_PROTOCOL_H */ 685