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 15 #define MPTCP_SUPPORTED_VERSION 1 16 17 /* MPTCP option bits */ 18 #define OPTION_MPTCP_MPC_SYN BIT(0) 19 #define OPTION_MPTCP_MPC_SYNACK BIT(1) 20 #define OPTION_MPTCP_MPC_ACK BIT(2) 21 #define OPTION_MPTCP_MPJ_SYN BIT(3) 22 #define OPTION_MPTCP_MPJ_SYNACK BIT(4) 23 #define OPTION_MPTCP_MPJ_ACK BIT(5) 24 #define OPTION_MPTCP_ADD_ADDR BIT(6) 25 #define OPTION_MPTCP_ADD_ADDR6 BIT(7) 26 #define OPTION_MPTCP_RM_ADDR BIT(8) 27 #define OPTION_MPTCP_FASTCLOSE BIT(9) 28 #define OPTION_MPTCP_PRIO BIT(10) 29 30 /* MPTCP option subtypes */ 31 #define MPTCPOPT_MP_CAPABLE 0 32 #define MPTCPOPT_MP_JOIN 1 33 #define MPTCPOPT_DSS 2 34 #define MPTCPOPT_ADD_ADDR 3 35 #define MPTCPOPT_RM_ADDR 4 36 #define MPTCPOPT_MP_PRIO 5 37 #define MPTCPOPT_MP_FAIL 6 38 #define MPTCPOPT_MP_FASTCLOSE 7 39 40 /* MPTCP suboption lengths */ 41 #define TCPOLEN_MPTCP_MPC_SYN 4 42 #define TCPOLEN_MPTCP_MPC_SYNACK 12 43 #define TCPOLEN_MPTCP_MPC_ACK 20 44 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22 45 #define TCPOLEN_MPTCP_MPJ_SYN 12 46 #define TCPOLEN_MPTCP_MPJ_SYNACK 16 47 #define TCPOLEN_MPTCP_MPJ_ACK 24 48 #define TCPOLEN_MPTCP_DSS_BASE 4 49 #define TCPOLEN_MPTCP_DSS_ACK32 4 50 #define TCPOLEN_MPTCP_DSS_ACK64 8 51 #define TCPOLEN_MPTCP_DSS_MAP32 10 52 #define TCPOLEN_MPTCP_DSS_MAP64 14 53 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2 54 #define TCPOLEN_MPTCP_ADD_ADDR 16 55 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 56 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 57 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 58 #define TCPOLEN_MPTCP_ADD_ADDR6 28 59 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 60 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 61 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 62 #define TCPOLEN_MPTCP_PORT_LEN 2 63 #define TCPOLEN_MPTCP_PORT_ALIGN 2 64 #define TCPOLEN_MPTCP_RM_ADDR_BASE 4 65 #define TCPOLEN_MPTCP_PRIO 3 66 #define TCPOLEN_MPTCP_PRIO_ALIGN 4 67 #define TCPOLEN_MPTCP_FASTCLOSE 12 68 69 /* MPTCP MP_JOIN flags */ 70 #define MPTCPOPT_BACKUP BIT(0) 71 #define MPTCPOPT_HMAC_LEN 20 72 #define MPTCPOPT_THMAC_LEN 8 73 74 /* MPTCP MP_CAPABLE flags */ 75 #define MPTCP_VERSION_MASK (0x0F) 76 #define MPTCP_CAP_CHECKSUM_REQD BIT(7) 77 #define MPTCP_CAP_EXTENSIBILITY BIT(6) 78 #define MPTCP_CAP_HMAC_SHA256 BIT(0) 79 #define MPTCP_CAP_FLAG_MASK (0x3F) 80 81 /* MPTCP DSS flags */ 82 #define MPTCP_DSS_DATA_FIN BIT(4) 83 #define MPTCP_DSS_DSN64 BIT(3) 84 #define MPTCP_DSS_HAS_MAP BIT(2) 85 #define MPTCP_DSS_ACK64 BIT(1) 86 #define MPTCP_DSS_HAS_ACK BIT(0) 87 #define MPTCP_DSS_FLAG_MASK (0x1F) 88 89 /* MPTCP ADD_ADDR flags */ 90 #define MPTCP_ADDR_ECHO BIT(0) 91 #define MPTCP_ADDR_IPVERSION_4 4 92 #define MPTCP_ADDR_IPVERSION_6 6 93 94 /* MPTCP MP_PRIO flags */ 95 #define MPTCP_PRIO_BKUP BIT(0) 96 97 /* MPTCP socket flags */ 98 #define MPTCP_DATA_READY 0 99 #define MPTCP_NOSPACE 1 100 #define MPTCP_WORK_RTX 2 101 #define MPTCP_WORK_EOF 3 102 #define MPTCP_FALLBACK_DONE 4 103 #define MPTCP_WORK_CLOSE_SUBFLOW 5 104 #define MPTCP_PUSH_PENDING 6 105 #define MPTCP_CLEAN_UNA 7 106 #define MPTCP_ERROR_REPORT 8 107 108 static inline bool before64(__u64 seq1, __u64 seq2) 109 { 110 return (__s64)(seq1 - seq2) < 0; 111 } 112 113 #define after64(seq2, seq1) before64(seq1, seq2) 114 115 struct mptcp_options_received { 116 u64 sndr_key; 117 u64 rcvr_key; 118 u64 data_ack; 119 u64 data_seq; 120 u32 subflow_seq; 121 u16 data_len; 122 u16 mp_capable : 1, 123 mp_join : 1, 124 fastclose : 1, 125 dss : 1, 126 add_addr : 1, 127 rm_addr : 1, 128 mp_prio : 1, 129 family : 4, 130 echo : 1, 131 backup : 1; 132 u32 token; 133 u32 nonce; 134 u64 thmac; 135 u8 hmac[MPTCPOPT_HMAC_LEN]; 136 u8 join_id; 137 u8 use_map:1, 138 dsn64:1, 139 data_fin:1, 140 use_ack:1, 141 ack64:1, 142 mpc_map:1, 143 __unused:2; 144 u8 addr_id; 145 u8 rm_id; 146 union { 147 struct in_addr addr; 148 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 149 struct in6_addr addr6; 150 #endif 151 }; 152 u64 ahmac; 153 u16 port; 154 }; 155 156 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 157 { 158 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 159 ((nib & 0xF) << 8) | field); 160 } 161 162 struct mptcp_addr_info { 163 sa_family_t family; 164 __be16 port; 165 u8 id; 166 u8 flags; 167 int ifindex; 168 union { 169 struct in_addr addr; 170 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 171 struct in6_addr addr6; 172 #endif 173 }; 174 }; 175 176 enum mptcp_pm_status { 177 MPTCP_PM_ADD_ADDR_RECEIVED, 178 MPTCP_PM_ADD_ADDR_SEND_ACK, 179 MPTCP_PM_RM_ADDR_RECEIVED, 180 MPTCP_PM_ESTABLISHED, 181 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 182 MPTCP_PM_SUBFLOW_ESTABLISHED, 183 }; 184 185 enum mptcp_addr_signal_status { 186 MPTCP_ADD_ADDR_SIGNAL, 187 MPTCP_ADD_ADDR_ECHO, 188 MPTCP_ADD_ADDR_IPV6, 189 MPTCP_ADD_ADDR_PORT, 190 MPTCP_RM_ADDR_SIGNAL, 191 }; 192 193 struct mptcp_pm_data { 194 struct mptcp_addr_info local; 195 struct mptcp_addr_info remote; 196 struct list_head anno_list; 197 198 spinlock_t lock; /*protects the whole PM data */ 199 200 u8 addr_signal; 201 bool server_side; 202 bool work_pending; 203 bool accept_addr; 204 bool accept_subflow; 205 u8 add_addr_signaled; 206 u8 add_addr_accepted; 207 u8 local_addr_used; 208 u8 subflows; 209 u8 status; 210 u8 rm_id; 211 }; 212 213 struct mptcp_data_frag { 214 struct list_head list; 215 u64 data_seq; 216 u16 data_len; 217 u16 offset; 218 u16 overhead; 219 u16 already_sent; 220 struct page *page; 221 }; 222 223 /* MPTCP connection sock */ 224 struct mptcp_sock { 225 /* inet_connection_sock must be the first member */ 226 struct inet_connection_sock sk; 227 u64 local_key; 228 u64 remote_key; 229 u64 write_seq; 230 u64 snd_nxt; 231 u64 ack_seq; 232 u64 rcv_wnd_sent; 233 u64 rcv_data_fin_seq; 234 int wmem_reserved; 235 struct sock *last_snd; 236 int snd_burst; 237 int old_wspace; 238 u64 snd_una; 239 u64 wnd_end; 240 unsigned long timer_ival; 241 u32 token; 242 int rmem_released; 243 unsigned long flags; 244 bool can_ack; 245 bool fully_established; 246 bool rcv_data_fin; 247 bool snd_data_fin_enable; 248 bool rcv_fastclose; 249 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 250 spinlock_t join_list_lock; 251 struct sock *ack_hint; 252 struct work_struct work; 253 struct sk_buff *ooo_last_skb; 254 struct rb_root out_of_order_queue; 255 struct sk_buff_head receive_queue; 256 struct sk_buff_head skb_tx_cache; /* this is wmem accounted */ 257 int tx_pending_data; 258 int size_goal_cache; 259 struct list_head conn_list; 260 struct list_head rtx_queue; 261 struct mptcp_data_frag *first_pending; 262 struct list_head join_list; 263 struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 264 struct sock *first; 265 struct mptcp_pm_data pm; 266 struct { 267 u32 space; /* bytes copied in last measurement window */ 268 u32 copied; /* bytes copied in this measurement window */ 269 u64 time; /* start time of measurement window */ 270 u64 rtt_us; /* last maximum rtt of subflows */ 271 } rcvq_space; 272 }; 273 274 #define mptcp_lock_sock(___sk, cb) do { \ 275 struct sock *__sk = (___sk); /* silence macro reuse warning */ \ 276 might_sleep(); \ 277 spin_lock_bh(&__sk->sk_lock.slock); \ 278 if (__sk->sk_lock.owned) \ 279 __lock_sock(__sk); \ 280 cb; \ 281 __sk->sk_lock.owned = 1; \ 282 spin_unlock(&__sk->sk_lock.slock); \ 283 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \ 284 local_bh_enable(); \ 285 } while (0) 286 287 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 288 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 289 290 #define mptcp_for_each_subflow(__msk, __subflow) \ 291 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 292 293 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 294 { 295 sock_owned_by_me((const struct sock *)msk); 296 } 297 298 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) 299 { 300 return (struct mptcp_sock *)sk; 301 } 302 303 static inline int __mptcp_space(const struct sock *sk) 304 { 305 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_released); 306 } 307 308 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 309 { 310 const struct mptcp_sock *msk = mptcp_sk(sk); 311 312 return READ_ONCE(msk->first_pending); 313 } 314 315 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 316 { 317 struct mptcp_sock *msk = mptcp_sk(sk); 318 struct mptcp_data_frag *cur; 319 320 cur = msk->first_pending; 321 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 322 list_next_entry(cur, list); 323 } 324 325 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 326 { 327 struct mptcp_sock *msk = mptcp_sk(sk); 328 329 if (!msk->first_pending) 330 return NULL; 331 332 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 333 return NULL; 334 335 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 336 } 337 338 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) 339 { 340 struct mptcp_sock *msk = mptcp_sk(sk); 341 342 if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 343 return NULL; 344 345 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 346 } 347 348 struct mptcp_subflow_request_sock { 349 struct tcp_request_sock sk; 350 u16 mp_capable : 1, 351 mp_join : 1, 352 backup : 1; 353 u8 local_id; 354 u8 remote_id; 355 u64 local_key; 356 u64 idsn; 357 u32 token; 358 u32 ssn_offset; 359 u64 thmac; 360 u32 local_nonce; 361 u32 remote_nonce; 362 struct mptcp_sock *msk; 363 struct hlist_nulls_node token_node; 364 }; 365 366 static inline struct mptcp_subflow_request_sock * 367 mptcp_subflow_rsk(const struct request_sock *rsk) 368 { 369 return (struct mptcp_subflow_request_sock *)rsk; 370 } 371 372 enum mptcp_data_avail { 373 MPTCP_SUBFLOW_NODATA, 374 MPTCP_SUBFLOW_DATA_AVAIL, 375 MPTCP_SUBFLOW_OOO_DATA 376 }; 377 378 struct mptcp_delegated_action { 379 struct napi_struct napi; 380 struct list_head head; 381 }; 382 383 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 384 385 #define MPTCP_DELEGATE_SEND 0 386 387 /* MPTCP subflow context */ 388 struct mptcp_subflow_context { 389 struct list_head node;/* conn_list of subflows */ 390 u64 local_key; 391 u64 remote_key; 392 u64 idsn; 393 u64 map_seq; 394 u32 snd_isn; 395 u32 token; 396 u32 rel_write_seq; 397 u32 map_subflow_seq; 398 u32 ssn_offset; 399 u32 map_data_len; 400 u32 request_mptcp : 1, /* send MP_CAPABLE */ 401 request_join : 1, /* send MP_JOIN */ 402 request_bkup : 1, 403 mp_capable : 1, /* remote is MPTCP capable */ 404 mp_join : 1, /* remote is JOINing */ 405 fully_established : 1, /* path validated */ 406 pm_notified : 1, /* PM hook called for established status */ 407 conn_finished : 1, 408 map_valid : 1, 409 mpc_map : 1, 410 backup : 1, 411 send_mp_prio : 1, 412 rx_eof : 1, 413 can_ack : 1, /* only after processing the remote a key */ 414 disposable : 1; /* ctx can be free at ulp release time */ 415 enum mptcp_data_avail data_avail; 416 u32 remote_nonce; 417 u64 thmac; 418 u32 local_nonce; 419 u32 remote_token; 420 u8 hmac[MPTCPOPT_HMAC_LEN]; 421 u8 local_id; 422 u8 remote_id; 423 424 long delegated_status; 425 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 426 427 struct sock *tcp_sock; /* tcp sk backpointer */ 428 struct sock *conn; /* parent mptcp_sock */ 429 const struct inet_connection_sock_af_ops *icsk_af_ops; 430 void (*tcp_data_ready)(struct sock *sk); 431 void (*tcp_state_change)(struct sock *sk); 432 void (*tcp_write_space)(struct sock *sk); 433 void (*tcp_error_report)(struct sock *sk); 434 435 struct rcu_head rcu; 436 }; 437 438 static inline struct mptcp_subflow_context * 439 mptcp_subflow_ctx(const struct sock *sk) 440 { 441 struct inet_connection_sock *icsk = inet_csk(sk); 442 443 /* Use RCU on icsk_ulp_data only for sock diag code */ 444 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 445 } 446 447 static inline struct sock * 448 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 449 { 450 return subflow->tcp_sock; 451 } 452 453 static inline u64 454 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 455 { 456 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 457 subflow->ssn_offset - 458 subflow->map_subflow_seq; 459 } 460 461 static inline u64 462 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 463 { 464 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 465 } 466 467 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, 468 struct mptcp_subflow_context *subflow) 469 { 470 sock_hold(mptcp_subflow_tcp_sock(subflow)); 471 spin_lock_bh(&msk->join_list_lock); 472 list_add_tail(&subflow->node, &msk->join_list); 473 spin_unlock_bh(&msk->join_list_lock); 474 } 475 476 void mptcp_subflow_process_delegated(struct sock *ssk); 477 478 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow) 479 { 480 struct mptcp_delegated_action *delegated; 481 bool schedule; 482 483 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and 484 * ensures the below list check sees list updates done prior to status 485 * bit changes 486 */ 487 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) { 488 /* still on delegated list from previous scheduling */ 489 if (!list_empty(&subflow->delegated_node)) 490 return; 491 492 /* the caller held the subflow bh socket lock */ 493 lockdep_assert_in_softirq(); 494 495 delegated = this_cpu_ptr(&mptcp_delegated_actions); 496 schedule = list_empty(&delegated->head); 497 list_add_tail(&subflow->delegated_node, &delegated->head); 498 sock_hold(mptcp_subflow_tcp_sock(subflow)); 499 if (schedule) 500 napi_schedule(&delegated->napi); 501 } 502 } 503 504 static inline struct mptcp_subflow_context * 505 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 506 { 507 struct mptcp_subflow_context *ret; 508 509 if (list_empty(&delegated->head)) 510 return NULL; 511 512 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 513 list_del_init(&ret->delegated_node); 514 return ret; 515 } 516 517 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow) 518 { 519 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 520 } 521 522 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow) 523 { 524 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before 525 * touching the status bit 526 */ 527 smp_wmb(); 528 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 529 } 530 531 int mptcp_is_enabled(struct net *net); 532 unsigned int mptcp_get_add_addr_timeout(struct net *net); 533 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 534 struct mptcp_options_received *mp_opt); 535 bool mptcp_subflow_data_available(struct sock *sk); 536 void __init mptcp_subflow_init(void); 537 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 538 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 539 struct mptcp_subflow_context *subflow); 540 void mptcp_subflow_reset(struct sock *ssk); 541 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 542 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk); 543 544 /* called with sk socket lock held */ 545 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 546 const struct mptcp_addr_info *remote); 547 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 548 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 549 struct sockaddr_storage *addr, 550 unsigned short family); 551 552 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 553 struct mptcp_subflow_context *ctx) 554 { 555 sk->sk_data_ready = ctx->tcp_data_ready; 556 sk->sk_state_change = ctx->tcp_state_change; 557 sk->sk_write_space = ctx->tcp_write_space; 558 sk->sk_error_report = ctx->tcp_error_report; 559 560 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 561 } 562 563 void __init mptcp_proto_init(void); 564 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 565 int __init mptcp_proto_v6_init(void); 566 #endif 567 568 struct sock *mptcp_sk_clone(const struct sock *sk, 569 const struct mptcp_options_received *mp_opt, 570 struct request_sock *req); 571 void mptcp_get_options(const struct sk_buff *skb, 572 struct mptcp_options_received *mp_opt); 573 574 void mptcp_finish_connect(struct sock *sk); 575 static inline bool mptcp_is_fully_established(struct sock *sk) 576 { 577 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 578 READ_ONCE(mptcp_sk(sk)->fully_established); 579 } 580 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 581 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 582 bool mptcp_finish_join(struct sock *sk); 583 bool mptcp_schedule_work(struct sock *sk); 584 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 585 void __mptcp_data_acked(struct sock *sk); 586 void __mptcp_error_report(struct sock *sk); 587 void mptcp_subflow_eof(struct sock *sk); 588 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 589 void __mptcp_flush_join_list(struct mptcp_sock *msk); 590 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 591 { 592 return READ_ONCE(msk->snd_data_fin_enable) && 593 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 594 } 595 596 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 597 { 598 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 599 return false; 600 601 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 602 return true; 603 } 604 605 static inline void mptcp_write_space(struct sock *sk) 606 { 607 if (sk_stream_is_writeable(sk)) { 608 /* pairs with memory barrier in mptcp_poll */ 609 smp_mb(); 610 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 611 sk_stream_write_space(sk); 612 } 613 } 614 615 void mptcp_destroy_common(struct mptcp_sock *msk); 616 617 void __init mptcp_token_init(void); 618 static inline void mptcp_token_init_request(struct request_sock *req) 619 { 620 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 621 } 622 623 int mptcp_token_new_request(struct request_sock *req); 624 void mptcp_token_destroy_request(struct request_sock *req); 625 int mptcp_token_new_connect(struct sock *sk); 626 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 627 struct mptcp_sock *msk); 628 bool mptcp_token_exists(u32 token); 629 struct mptcp_sock *mptcp_token_get_sock(u32 token); 630 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 631 long *s_num); 632 void mptcp_token_destroy(struct mptcp_sock *msk); 633 634 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 635 636 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 637 638 void __init mptcp_pm_init(void); 639 void mptcp_pm_data_init(struct mptcp_sock *msk); 640 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 641 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp); 642 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 643 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 644 void mptcp_pm_subflow_established(struct mptcp_sock *msk, 645 struct mptcp_subflow_context *subflow); 646 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); 647 void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 648 const struct mptcp_addr_info *addr); 649 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 650 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id); 651 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 652 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 653 struct mptcp_addr_info *addr, 654 u8 bkup); 655 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 656 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 657 struct mptcp_pm_add_entry * 658 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 659 struct mptcp_addr_info *addr); 660 661 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 662 const struct mptcp_addr_info *addr, 663 bool echo, bool port); 664 int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id); 665 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id); 666 667 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 668 const struct sock *ssk, gfp_t gfp); 669 void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info); 670 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 671 672 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 673 { 674 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 675 } 676 677 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 678 { 679 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 680 } 681 682 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk) 683 { 684 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6); 685 } 686 687 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk) 688 { 689 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT); 690 } 691 692 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 693 { 694 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 695 } 696 697 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 698 { 699 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 700 701 if (family == AF_INET6) 702 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 703 if (!echo) 704 len += MPTCPOPT_THMAC_LEN; 705 /* account for 2 trailing 'nop' options */ 706 if (port) 707 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 708 709 return len; 710 } 711 712 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 713 struct mptcp_addr_info *saddr, bool *echo, bool *port); 714 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 715 u8 *rm_id); 716 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 717 718 void __init mptcp_pm_nl_init(void); 719 void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 720 void mptcp_pm_nl_work(struct mptcp_sock *msk); 721 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id); 722 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 723 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk); 724 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk); 725 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk); 726 unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk); 727 728 static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb) 729 { 730 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 731 } 732 733 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 734 735 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 736 { 737 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 738 } 739 740 static inline bool mptcp_check_fallback(const struct sock *sk) 741 { 742 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 743 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 744 745 return __mptcp_check_fallback(msk); 746 } 747 748 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 749 { 750 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 751 pr_debug("TCP fallback already done (msk=%p)", msk); 752 return; 753 } 754 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 755 } 756 757 static inline void mptcp_do_fallback(struct sock *sk) 758 { 759 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 760 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 761 762 __mptcp_do_fallback(msk); 763 } 764 765 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 766 767 static inline bool subflow_simultaneous_connect(struct sock *sk) 768 { 769 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 770 struct sock *parent = subflow->conn; 771 772 return sk->sk_state == TCP_ESTABLISHED && 773 !mptcp_sk(parent)->pm.server_side && 774 !subflow->conn_finished; 775 } 776 777 #ifdef CONFIG_SYN_COOKIES 778 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 779 struct sk_buff *skb); 780 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 781 struct sk_buff *skb); 782 void __init mptcp_join_cookie_init(void); 783 #else 784 static inline void 785 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 786 struct sk_buff *skb) {} 787 static inline bool 788 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 789 struct sk_buff *skb) 790 { 791 return false; 792 } 793 794 static inline void mptcp_join_cookie_init(void) {} 795 #endif 796 797 #endif /* __MPTCP_PROTOCOL_H */ 798