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 20 56 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 57 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 12 58 #define TCPOLEN_MPTCP_ADD_ADDR6 28 59 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 32 60 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 61 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 24 62 #define TCPOLEN_MPTCP_PORT_LEN 4 63 #define TCPOLEN_MPTCP_RM_ADDR_BASE 4 64 #define TCPOLEN_MPTCP_PRIO 3 65 #define TCPOLEN_MPTCP_PRIO_ALIGN 4 66 #define TCPOLEN_MPTCP_FASTCLOSE 12 67 68 /* MPTCP MP_JOIN flags */ 69 #define MPTCPOPT_BACKUP BIT(0) 70 #define MPTCPOPT_HMAC_LEN 20 71 #define MPTCPOPT_THMAC_LEN 8 72 73 /* MPTCP MP_CAPABLE flags */ 74 #define MPTCP_VERSION_MASK (0x0F) 75 #define MPTCP_CAP_CHECKSUM_REQD BIT(7) 76 #define MPTCP_CAP_EXTENSIBILITY BIT(6) 77 #define MPTCP_CAP_HMAC_SHA256 BIT(0) 78 #define MPTCP_CAP_FLAG_MASK (0x3F) 79 80 /* MPTCP DSS flags */ 81 #define MPTCP_DSS_DATA_FIN BIT(4) 82 #define MPTCP_DSS_DSN64 BIT(3) 83 #define MPTCP_DSS_HAS_MAP BIT(2) 84 #define MPTCP_DSS_ACK64 BIT(1) 85 #define MPTCP_DSS_HAS_ACK BIT(0) 86 #define MPTCP_DSS_FLAG_MASK (0x1F) 87 88 /* MPTCP ADD_ADDR flags */ 89 #define MPTCP_ADDR_ECHO BIT(0) 90 #define MPTCP_ADDR_IPVERSION_4 4 91 #define MPTCP_ADDR_IPVERSION_6 6 92 93 /* MPTCP MP_PRIO flags */ 94 #define MPTCP_PRIO_BKUP BIT(0) 95 96 /* MPTCP socket flags */ 97 #define MPTCP_DATA_READY 0 98 #define MPTCP_NOSPACE 1 99 #define MPTCP_WORK_RTX 2 100 #define MPTCP_WORK_EOF 3 101 #define MPTCP_FALLBACK_DONE 4 102 #define MPTCP_WORK_CLOSE_SUBFLOW 5 103 #define MPTCP_PUSH_PENDING 6 104 #define MPTCP_CLEAN_UNA 7 105 106 static inline bool before64(__u64 seq1, __u64 seq2) 107 { 108 return (__s64)(seq1 - seq2) < 0; 109 } 110 111 #define after64(seq2, seq1) before64(seq1, seq2) 112 113 struct mptcp_options_received { 114 u64 sndr_key; 115 u64 rcvr_key; 116 u64 data_ack; 117 u64 data_seq; 118 u32 subflow_seq; 119 u16 data_len; 120 u16 mp_capable : 1, 121 mp_join : 1, 122 fastclose : 1, 123 dss : 1, 124 add_addr : 1, 125 rm_addr : 1, 126 mp_prio : 1, 127 family : 4, 128 echo : 1, 129 backup : 1; 130 u32 token; 131 u32 nonce; 132 u64 thmac; 133 u8 hmac[MPTCPOPT_HMAC_LEN]; 134 u8 join_id; 135 u8 use_map:1, 136 dsn64:1, 137 data_fin:1, 138 use_ack:1, 139 ack64:1, 140 mpc_map:1, 141 __unused:2; 142 u8 addr_id; 143 u8 rm_id; 144 union { 145 struct in_addr addr; 146 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 147 struct in6_addr addr6; 148 #endif 149 }; 150 u64 ahmac; 151 u16 port; 152 }; 153 154 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 155 { 156 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 157 ((nib & 0xF) << 8) | field); 158 } 159 160 struct mptcp_addr_info { 161 sa_family_t family; 162 __be16 port; 163 u8 id; 164 u8 flags; 165 int ifindex; 166 union { 167 struct in_addr addr; 168 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 169 struct in6_addr addr6; 170 #endif 171 }; 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_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 180 MPTCP_PM_SUBFLOW_ESTABLISHED, 181 }; 182 183 enum mptcp_addr_signal_status { 184 MPTCP_ADD_ADDR_SIGNAL, 185 MPTCP_ADD_ADDR_ECHO, 186 MPTCP_ADD_ADDR_IPV6, 187 MPTCP_ADD_ADDR_PORT, 188 MPTCP_RM_ADDR_SIGNAL, 189 }; 190 191 struct mptcp_pm_data { 192 struct mptcp_addr_info local; 193 struct mptcp_addr_info remote; 194 struct list_head anno_list; 195 196 spinlock_t lock; /*protects the whole PM data */ 197 198 u8 addr_signal; 199 bool server_side; 200 bool work_pending; 201 bool accept_addr; 202 bool accept_subflow; 203 u8 add_addr_signaled; 204 u8 add_addr_accepted; 205 u8 local_addr_used; 206 u8 subflows; 207 u8 status; 208 u8 rm_id; 209 }; 210 211 struct mptcp_data_frag { 212 struct list_head list; 213 u64 data_seq; 214 u16 data_len; 215 u16 offset; 216 u16 overhead; 217 u16 already_sent; 218 struct page *page; 219 }; 220 221 /* MPTCP connection sock */ 222 struct mptcp_sock { 223 /* inet_connection_sock must be the first member */ 224 struct inet_connection_sock sk; 225 u64 local_key; 226 u64 remote_key; 227 u64 write_seq; 228 u64 snd_nxt; 229 u64 ack_seq; 230 u64 rcv_wnd_sent; 231 u64 rcv_data_fin_seq; 232 int wmem_reserved; 233 struct sock *last_snd; 234 int snd_burst; 235 int old_wspace; 236 u64 snd_una; 237 u64 wnd_end; 238 unsigned long timer_ival; 239 u32 token; 240 int rmem_pending; 241 int rmem_released; 242 unsigned long flags; 243 bool can_ack; 244 bool fully_established; 245 bool rcv_data_fin; 246 bool snd_data_fin_enable; 247 bool rcv_fastclose; 248 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 249 spinlock_t join_list_lock; 250 struct sock *ack_hint; 251 struct work_struct work; 252 struct sk_buff *ooo_last_skb; 253 struct rb_root out_of_order_queue; 254 struct sk_buff_head receive_queue; 255 struct sk_buff_head skb_tx_cache; /* this is wmem accounted */ 256 int tx_pending_data; 257 int size_goal_cache; 258 struct list_head conn_list; 259 struct list_head rtx_queue; 260 struct mptcp_data_frag *first_pending; 261 struct list_head join_list; 262 struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 263 struct sock *first; 264 struct mptcp_pm_data pm; 265 struct { 266 u32 space; /* bytes copied in last measurement window */ 267 u32 copied; /* bytes copied in this measurement window */ 268 u64 time; /* start time of measurement window */ 269 u64 rtt_us; /* last maximum rtt of subflows */ 270 } rcvq_space; 271 }; 272 273 #define mptcp_lock_sock(___sk, cb) do { \ 274 struct sock *__sk = (___sk); /* silence macro reuse warning */ \ 275 might_sleep(); \ 276 spin_lock_bh(&__sk->sk_lock.slock); \ 277 if (__sk->sk_lock.owned) \ 278 __lock_sock(__sk); \ 279 cb; \ 280 __sk->sk_lock.owned = 1; \ 281 spin_unlock(&__sk->sk_lock.slock); \ 282 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \ 283 local_bh_enable(); \ 284 } while (0) 285 286 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 287 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 288 289 #define mptcp_for_each_subflow(__msk, __subflow) \ 290 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 291 292 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 293 { 294 sock_owned_by_me((const struct sock *)msk); 295 } 296 297 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) 298 { 299 return (struct mptcp_sock *)sk; 300 } 301 302 static inline int __mptcp_space(const struct sock *sk) 303 { 304 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_pending); 305 } 306 307 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 308 { 309 const struct mptcp_sock *msk = mptcp_sk(sk); 310 311 return READ_ONCE(msk->first_pending); 312 } 313 314 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 315 { 316 struct mptcp_sock *msk = mptcp_sk(sk); 317 struct mptcp_data_frag *cur; 318 319 cur = msk->first_pending; 320 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 321 list_next_entry(cur, list); 322 } 323 324 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 325 { 326 struct mptcp_sock *msk = mptcp_sk(sk); 327 328 if (!msk->first_pending) 329 return NULL; 330 331 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 332 return NULL; 333 334 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 335 } 336 337 static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk) 338 { 339 struct mptcp_sock *msk = mptcp_sk(sk); 340 341 if (!before64(msk->snd_nxt, READ_ONCE(msk->snd_una))) 342 return NULL; 343 344 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 345 } 346 347 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) 348 { 349 struct mptcp_sock *msk = mptcp_sk(sk); 350 351 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 352 } 353 354 struct mptcp_subflow_request_sock { 355 struct tcp_request_sock sk; 356 u16 mp_capable : 1, 357 mp_join : 1, 358 backup : 1; 359 u8 local_id; 360 u8 remote_id; 361 u64 local_key; 362 u64 idsn; 363 u32 token; 364 u32 ssn_offset; 365 u64 thmac; 366 u32 local_nonce; 367 u32 remote_nonce; 368 struct mptcp_sock *msk; 369 struct hlist_nulls_node token_node; 370 }; 371 372 static inline struct mptcp_subflow_request_sock * 373 mptcp_subflow_rsk(const struct request_sock *rsk) 374 { 375 return (struct mptcp_subflow_request_sock *)rsk; 376 } 377 378 enum mptcp_data_avail { 379 MPTCP_SUBFLOW_NODATA, 380 MPTCP_SUBFLOW_DATA_AVAIL, 381 MPTCP_SUBFLOW_OOO_DATA 382 }; 383 384 struct mptcp_delegated_action { 385 struct napi_struct napi; 386 struct list_head head; 387 }; 388 389 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 390 391 #define MPTCP_DELEGATE_SEND 0 392 393 /* MPTCP subflow context */ 394 struct mptcp_subflow_context { 395 struct list_head node;/* conn_list of subflows */ 396 u64 local_key; 397 u64 remote_key; 398 u64 idsn; 399 u64 map_seq; 400 u32 snd_isn; 401 u32 token; 402 u32 rel_write_seq; 403 u32 map_subflow_seq; 404 u32 ssn_offset; 405 u32 map_data_len; 406 u32 request_mptcp : 1, /* send MP_CAPABLE */ 407 request_join : 1, /* send MP_JOIN */ 408 request_bkup : 1, 409 mp_capable : 1, /* remote is MPTCP capable */ 410 mp_join : 1, /* remote is JOINing */ 411 fully_established : 1, /* path validated */ 412 pm_notified : 1, /* PM hook called for established status */ 413 conn_finished : 1, 414 map_valid : 1, 415 mpc_map : 1, 416 backup : 1, 417 send_mp_prio : 1, 418 rx_eof : 1, 419 can_ack : 1, /* only after processing the remote a key */ 420 disposable : 1; /* ctx can be free at ulp release time */ 421 enum mptcp_data_avail data_avail; 422 u32 remote_nonce; 423 u64 thmac; 424 u32 local_nonce; 425 u32 remote_token; 426 u8 hmac[MPTCPOPT_HMAC_LEN]; 427 u8 local_id; 428 u8 remote_id; 429 430 long delegated_status; 431 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 432 433 struct sock *tcp_sock; /* tcp sk backpointer */ 434 struct sock *conn; /* parent mptcp_sock */ 435 const struct inet_connection_sock_af_ops *icsk_af_ops; 436 void (*tcp_data_ready)(struct sock *sk); 437 void (*tcp_state_change)(struct sock *sk); 438 void (*tcp_write_space)(struct sock *sk); 439 440 struct rcu_head rcu; 441 }; 442 443 static inline struct mptcp_subflow_context * 444 mptcp_subflow_ctx(const struct sock *sk) 445 { 446 struct inet_connection_sock *icsk = inet_csk(sk); 447 448 /* Use RCU on icsk_ulp_data only for sock diag code */ 449 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 450 } 451 452 static inline struct sock * 453 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 454 { 455 return subflow->tcp_sock; 456 } 457 458 static inline u64 459 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 460 { 461 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 462 subflow->ssn_offset - 463 subflow->map_subflow_seq; 464 } 465 466 static inline u64 467 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 468 { 469 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 470 } 471 472 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, 473 struct mptcp_subflow_context *subflow) 474 { 475 sock_hold(mptcp_subflow_tcp_sock(subflow)); 476 spin_lock_bh(&msk->join_list_lock); 477 list_add_tail(&subflow->node, &msk->join_list); 478 spin_unlock_bh(&msk->join_list_lock); 479 } 480 481 void mptcp_subflow_process_delegated(struct sock *ssk); 482 483 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow) 484 { 485 struct mptcp_delegated_action *delegated; 486 bool schedule; 487 488 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and 489 * ensures the below list check sees list updates done prior to status 490 * bit changes 491 */ 492 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) { 493 /* still on delegated list from previous scheduling */ 494 if (!list_empty(&subflow->delegated_node)) 495 return; 496 497 /* the caller held the subflow bh socket lock */ 498 lockdep_assert_in_softirq(); 499 500 delegated = this_cpu_ptr(&mptcp_delegated_actions); 501 schedule = list_empty(&delegated->head); 502 list_add_tail(&subflow->delegated_node, &delegated->head); 503 sock_hold(mptcp_subflow_tcp_sock(subflow)); 504 if (schedule) 505 napi_schedule(&delegated->napi); 506 } 507 } 508 509 static inline struct mptcp_subflow_context * 510 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 511 { 512 struct mptcp_subflow_context *ret; 513 514 if (list_empty(&delegated->head)) 515 return NULL; 516 517 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 518 list_del_init(&ret->delegated_node); 519 return ret; 520 } 521 522 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow) 523 { 524 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 525 } 526 527 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow) 528 { 529 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before 530 * touching the status bit 531 */ 532 smp_wmb(); 533 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 534 } 535 536 int mptcp_is_enabled(struct net *net); 537 unsigned int mptcp_get_add_addr_timeout(struct net *net); 538 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 539 struct mptcp_options_received *mp_opt); 540 bool mptcp_subflow_data_available(struct sock *sk); 541 void __init mptcp_subflow_init(void); 542 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 543 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 544 struct mptcp_subflow_context *subflow); 545 void mptcp_subflow_reset(struct sock *ssk); 546 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 547 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk); 548 549 /* called with sk socket lock held */ 550 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 551 const struct mptcp_addr_info *remote); 552 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 553 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 554 struct sockaddr_storage *addr, 555 unsigned short family); 556 557 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 558 struct mptcp_subflow_context *ctx) 559 { 560 sk->sk_data_ready = ctx->tcp_data_ready; 561 sk->sk_state_change = ctx->tcp_state_change; 562 sk->sk_write_space = ctx->tcp_write_space; 563 564 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 565 } 566 567 void __init mptcp_proto_init(void); 568 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 569 int __init mptcp_proto_v6_init(void); 570 #endif 571 572 struct sock *mptcp_sk_clone(const struct sock *sk, 573 const struct mptcp_options_received *mp_opt, 574 struct request_sock *req); 575 void mptcp_get_options(const struct sk_buff *skb, 576 struct mptcp_options_received *mp_opt); 577 578 void mptcp_finish_connect(struct sock *sk); 579 static inline bool mptcp_is_fully_established(struct sock *sk) 580 { 581 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 582 READ_ONCE(mptcp_sk(sk)->fully_established); 583 } 584 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 585 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 586 bool mptcp_finish_join(struct sock *sk); 587 bool mptcp_schedule_work(struct sock *sk); 588 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 589 void __mptcp_data_acked(struct sock *sk); 590 void mptcp_subflow_eof(struct sock *sk); 591 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 592 void __mptcp_flush_join_list(struct mptcp_sock *msk); 593 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 594 { 595 return READ_ONCE(msk->snd_data_fin_enable) && 596 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 597 } 598 599 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 600 { 601 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 602 return false; 603 604 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 605 return true; 606 } 607 608 static inline void mptcp_write_space(struct sock *sk) 609 { 610 if (sk_stream_is_writeable(sk)) { 611 /* pairs with memory barrier in mptcp_poll */ 612 smp_mb(); 613 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 614 sk_stream_write_space(sk); 615 } 616 } 617 618 void mptcp_destroy_common(struct mptcp_sock *msk); 619 620 void __init mptcp_token_init(void); 621 static inline void mptcp_token_init_request(struct request_sock *req) 622 { 623 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 624 } 625 626 int mptcp_token_new_request(struct request_sock *req); 627 void mptcp_token_destroy_request(struct request_sock *req); 628 int mptcp_token_new_connect(struct sock *sk); 629 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 630 struct mptcp_sock *msk); 631 bool mptcp_token_exists(u32 token); 632 struct mptcp_sock *mptcp_token_get_sock(u32 token); 633 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 634 long *s_num); 635 void mptcp_token_destroy(struct mptcp_sock *msk); 636 637 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 638 639 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 640 641 void __init mptcp_pm_init(void); 642 void mptcp_pm_data_init(struct mptcp_sock *msk); 643 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 644 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp); 645 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 646 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 647 void mptcp_pm_subflow_established(struct mptcp_sock *msk, 648 struct mptcp_subflow_context *subflow); 649 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); 650 void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 651 const struct mptcp_addr_info *addr); 652 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 653 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id); 654 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 655 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 656 struct mptcp_addr_info *addr, 657 u8 bkup); 658 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 659 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 660 struct mptcp_pm_add_entry * 661 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 662 struct mptcp_addr_info *addr); 663 664 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 665 const struct mptcp_addr_info *addr, 666 bool echo, bool port); 667 int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id); 668 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id); 669 670 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 671 const struct sock *ssk, gfp_t gfp); 672 void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info); 673 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 674 675 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 676 { 677 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 678 } 679 680 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 681 { 682 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 683 } 684 685 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk) 686 { 687 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6); 688 } 689 690 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk) 691 { 692 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT); 693 } 694 695 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 696 { 697 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 698 } 699 700 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 701 { 702 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 703 704 if (family == AF_INET6) 705 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 706 if (!echo) 707 len += MPTCPOPT_THMAC_LEN; 708 if (port) 709 len += TCPOLEN_MPTCP_PORT_LEN; 710 711 return len; 712 } 713 714 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 715 struct mptcp_addr_info *saddr, bool *echo, bool *port); 716 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 717 u8 *rm_id); 718 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 719 720 void __init mptcp_pm_nl_init(void); 721 void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 722 void mptcp_pm_nl_work(struct mptcp_sock *msk); 723 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id); 724 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 725 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk); 726 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk); 727 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk); 728 729 static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb) 730 { 731 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 732 } 733 734 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 735 736 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 737 { 738 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 739 } 740 741 static inline bool mptcp_check_fallback(const struct sock *sk) 742 { 743 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 744 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 745 746 return __mptcp_check_fallback(msk); 747 } 748 749 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 750 { 751 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 752 pr_debug("TCP fallback already done (msk=%p)", msk); 753 return; 754 } 755 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 756 } 757 758 static inline void mptcp_do_fallback(struct sock *sk) 759 { 760 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 761 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 762 763 __mptcp_do_fallback(msk); 764 } 765 766 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 767 768 static inline bool subflow_simultaneous_connect(struct sock *sk) 769 { 770 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 771 struct sock *parent = subflow->conn; 772 773 return sk->sk_state == TCP_ESTABLISHED && 774 !mptcp_sk(parent)->pm.server_side && 775 !subflow->conn_finished; 776 } 777 778 #ifdef CONFIG_SYN_COOKIES 779 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 780 struct sk_buff *skb); 781 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 782 struct sk_buff *skb); 783 void __init mptcp_join_cookie_init(void); 784 #else 785 static inline void 786 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 787 struct sk_buff *skb) {} 788 static inline bool 789 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 790 struct sk_buff *skb) 791 { 792 return false; 793 } 794 795 static inline void mptcp_join_cookie_init(void) {} 796 #endif 797 798 #endif /* __MPTCP_PROTOCOL_H */ 799