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 3 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 struct mptcp_rm_list rm_list; 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 struct mptcp_rm_list rm_list_tx; 211 struct mptcp_rm_list rm_list_rx; 212 }; 213 214 struct mptcp_data_frag { 215 struct list_head list; 216 u64 data_seq; 217 u16 data_len; 218 u16 offset; 219 u16 overhead; 220 u16 already_sent; 221 struct page *page; 222 }; 223 224 /* MPTCP connection sock */ 225 struct mptcp_sock { 226 /* inet_connection_sock must be the first member */ 227 struct inet_connection_sock sk; 228 u64 local_key; 229 u64 remote_key; 230 u64 write_seq; 231 u64 snd_nxt; 232 u64 ack_seq; 233 u64 rcv_wnd_sent; 234 u64 rcv_data_fin_seq; 235 int wmem_reserved; 236 struct sock *last_snd; 237 int snd_burst; 238 int old_wspace; 239 u64 snd_una; 240 u64 wnd_end; 241 unsigned long timer_ival; 242 u32 token; 243 int rmem_released; 244 unsigned long flags; 245 bool can_ack; 246 bool fully_established; 247 bool rcv_data_fin; 248 bool snd_data_fin_enable; 249 bool rcv_fastclose; 250 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 251 spinlock_t join_list_lock; 252 struct sock *ack_hint; 253 struct work_struct work; 254 struct sk_buff *ooo_last_skb; 255 struct rb_root out_of_order_queue; 256 struct sk_buff_head receive_queue; 257 struct sk_buff_head skb_tx_cache; /* this is wmem accounted */ 258 int tx_pending_data; 259 int size_goal_cache; 260 struct list_head conn_list; 261 struct list_head rtx_queue; 262 struct mptcp_data_frag *first_pending; 263 struct list_head join_list; 264 struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 265 struct sock *first; 266 struct mptcp_pm_data pm; 267 struct { 268 u32 space; /* bytes copied in last measurement window */ 269 u32 copied; /* bytes copied in this measurement window */ 270 u64 time; /* start time of measurement window */ 271 u64 rtt_us; /* last maximum rtt of subflows */ 272 } rcvq_space; 273 }; 274 275 #define mptcp_lock_sock(___sk, cb) do { \ 276 struct sock *__sk = (___sk); /* silence macro reuse warning */ \ 277 might_sleep(); \ 278 spin_lock_bh(&__sk->sk_lock.slock); \ 279 if (__sk->sk_lock.owned) \ 280 __lock_sock(__sk); \ 281 cb; \ 282 __sk->sk_lock.owned = 1; \ 283 spin_unlock(&__sk->sk_lock.slock); \ 284 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \ 285 local_bh_enable(); \ 286 } while (0) 287 288 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 289 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 290 291 #define mptcp_for_each_subflow(__msk, __subflow) \ 292 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 293 294 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 295 { 296 sock_owned_by_me((const struct sock *)msk); 297 } 298 299 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) 300 { 301 return (struct mptcp_sock *)sk; 302 } 303 304 static inline int __mptcp_space(const struct sock *sk) 305 { 306 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_released); 307 } 308 309 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 310 { 311 const struct mptcp_sock *msk = mptcp_sk(sk); 312 313 return READ_ONCE(msk->first_pending); 314 } 315 316 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 317 { 318 struct mptcp_sock *msk = mptcp_sk(sk); 319 struct mptcp_data_frag *cur; 320 321 cur = msk->first_pending; 322 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 323 list_next_entry(cur, list); 324 } 325 326 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 327 { 328 struct mptcp_sock *msk = mptcp_sk(sk); 329 330 if (!msk->first_pending) 331 return NULL; 332 333 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 334 return NULL; 335 336 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 337 } 338 339 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) 340 { 341 struct mptcp_sock *msk = mptcp_sk(sk); 342 343 if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 344 return NULL; 345 346 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 347 } 348 349 struct mptcp_subflow_request_sock { 350 struct tcp_request_sock sk; 351 u16 mp_capable : 1, 352 mp_join : 1, 353 backup : 1; 354 u8 local_id; 355 u8 remote_id; 356 u64 local_key; 357 u64 idsn; 358 u32 token; 359 u32 ssn_offset; 360 u64 thmac; 361 u32 local_nonce; 362 u32 remote_nonce; 363 struct mptcp_sock *msk; 364 struct hlist_nulls_node token_node; 365 }; 366 367 static inline struct mptcp_subflow_request_sock * 368 mptcp_subflow_rsk(const struct request_sock *rsk) 369 { 370 return (struct mptcp_subflow_request_sock *)rsk; 371 } 372 373 enum mptcp_data_avail { 374 MPTCP_SUBFLOW_NODATA, 375 MPTCP_SUBFLOW_DATA_AVAIL, 376 MPTCP_SUBFLOW_OOO_DATA 377 }; 378 379 struct mptcp_delegated_action { 380 struct napi_struct napi; 381 struct list_head head; 382 }; 383 384 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 385 386 #define MPTCP_DELEGATE_SEND 0 387 388 /* MPTCP subflow context */ 389 struct mptcp_subflow_context { 390 struct list_head node;/* conn_list of subflows */ 391 u64 local_key; 392 u64 remote_key; 393 u64 idsn; 394 u64 map_seq; 395 u32 snd_isn; 396 u32 token; 397 u32 rel_write_seq; 398 u32 map_subflow_seq; 399 u32 ssn_offset; 400 u32 map_data_len; 401 u32 request_mptcp : 1, /* send MP_CAPABLE */ 402 request_join : 1, /* send MP_JOIN */ 403 request_bkup : 1, 404 mp_capable : 1, /* remote is MPTCP capable */ 405 mp_join : 1, /* remote is JOINing */ 406 fully_established : 1, /* path validated */ 407 pm_notified : 1, /* PM hook called for established status */ 408 conn_finished : 1, 409 map_valid : 1, 410 mpc_map : 1, 411 backup : 1, 412 send_mp_prio : 1, 413 rx_eof : 1, 414 can_ack : 1, /* only after processing the remote a key */ 415 disposable : 1; /* ctx can be free at ulp release time */ 416 enum mptcp_data_avail data_avail; 417 u32 remote_nonce; 418 u64 thmac; 419 u32 local_nonce; 420 u32 remote_token; 421 u8 hmac[MPTCPOPT_HMAC_LEN]; 422 u8 local_id; 423 u8 remote_id; 424 425 long delegated_status; 426 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 427 428 struct sock *tcp_sock; /* tcp sk backpointer */ 429 struct sock *conn; /* parent mptcp_sock */ 430 const struct inet_connection_sock_af_ops *icsk_af_ops; 431 void (*tcp_data_ready)(struct sock *sk); 432 void (*tcp_state_change)(struct sock *sk); 433 void (*tcp_write_space)(struct sock *sk); 434 void (*tcp_error_report)(struct sock *sk); 435 436 struct rcu_head rcu; 437 }; 438 439 static inline struct mptcp_subflow_context * 440 mptcp_subflow_ctx(const struct sock *sk) 441 { 442 struct inet_connection_sock *icsk = inet_csk(sk); 443 444 /* Use RCU on icsk_ulp_data only for sock diag code */ 445 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 446 } 447 448 static inline struct sock * 449 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 450 { 451 return subflow->tcp_sock; 452 } 453 454 static inline u64 455 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 456 { 457 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 458 subflow->ssn_offset - 459 subflow->map_subflow_seq; 460 } 461 462 static inline u64 463 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 464 { 465 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 466 } 467 468 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, 469 struct mptcp_subflow_context *subflow) 470 { 471 sock_hold(mptcp_subflow_tcp_sock(subflow)); 472 spin_lock_bh(&msk->join_list_lock); 473 list_add_tail(&subflow->node, &msk->join_list); 474 spin_unlock_bh(&msk->join_list_lock); 475 } 476 477 void mptcp_subflow_process_delegated(struct sock *ssk); 478 479 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow) 480 { 481 struct mptcp_delegated_action *delegated; 482 bool schedule; 483 484 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and 485 * ensures the below list check sees list updates done prior to status 486 * bit changes 487 */ 488 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) { 489 /* still on delegated list from previous scheduling */ 490 if (!list_empty(&subflow->delegated_node)) 491 return; 492 493 /* the caller held the subflow bh socket lock */ 494 lockdep_assert_in_softirq(); 495 496 delegated = this_cpu_ptr(&mptcp_delegated_actions); 497 schedule = list_empty(&delegated->head); 498 list_add_tail(&subflow->delegated_node, &delegated->head); 499 sock_hold(mptcp_subflow_tcp_sock(subflow)); 500 if (schedule) 501 napi_schedule(&delegated->napi); 502 } 503 } 504 505 static inline struct mptcp_subflow_context * 506 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 507 { 508 struct mptcp_subflow_context *ret; 509 510 if (list_empty(&delegated->head)) 511 return NULL; 512 513 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 514 list_del_init(&ret->delegated_node); 515 return ret; 516 } 517 518 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow) 519 { 520 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 521 } 522 523 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow) 524 { 525 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before 526 * touching the status bit 527 */ 528 smp_wmb(); 529 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 530 } 531 532 int mptcp_is_enabled(struct net *net); 533 unsigned int mptcp_get_add_addr_timeout(struct net *net); 534 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 535 struct mptcp_options_received *mp_opt); 536 bool mptcp_subflow_data_available(struct sock *sk); 537 void __init mptcp_subflow_init(void); 538 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 539 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 540 struct mptcp_subflow_context *subflow); 541 void mptcp_subflow_reset(struct sock *ssk); 542 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 543 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk); 544 545 /* called with sk socket lock held */ 546 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 547 const struct mptcp_addr_info *remote); 548 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 549 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 550 struct sockaddr_storage *addr, 551 unsigned short family); 552 553 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 554 struct mptcp_subflow_context *ctx) 555 { 556 sk->sk_data_ready = ctx->tcp_data_ready; 557 sk->sk_state_change = ctx->tcp_state_change; 558 sk->sk_write_space = ctx->tcp_write_space; 559 sk->sk_error_report = ctx->tcp_error_report; 560 561 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 562 } 563 564 void __init mptcp_proto_init(void); 565 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 566 int __init mptcp_proto_v6_init(void); 567 #endif 568 569 struct sock *mptcp_sk_clone(const struct sock *sk, 570 const struct mptcp_options_received *mp_opt, 571 struct request_sock *req); 572 void mptcp_get_options(const struct sk_buff *skb, 573 struct mptcp_options_received *mp_opt); 574 575 void mptcp_finish_connect(struct sock *sk); 576 static inline bool mptcp_is_fully_established(struct sock *sk) 577 { 578 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 579 READ_ONCE(mptcp_sk(sk)->fully_established); 580 } 581 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 582 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 583 bool mptcp_finish_join(struct sock *sk); 584 bool mptcp_schedule_work(struct sock *sk); 585 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 586 void __mptcp_data_acked(struct sock *sk); 587 void __mptcp_error_report(struct sock *sk); 588 void mptcp_subflow_eof(struct sock *sk); 589 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 590 void __mptcp_flush_join_list(struct mptcp_sock *msk); 591 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 592 { 593 return READ_ONCE(msk->snd_data_fin_enable) && 594 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 595 } 596 597 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 598 { 599 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 600 return false; 601 602 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 603 return true; 604 } 605 606 static inline void mptcp_write_space(struct sock *sk) 607 { 608 if (sk_stream_is_writeable(sk)) { 609 /* pairs with memory barrier in mptcp_poll */ 610 smp_mb(); 611 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 612 sk_stream_write_space(sk); 613 } 614 } 615 616 void mptcp_destroy_common(struct mptcp_sock *msk); 617 618 void __init mptcp_token_init(void); 619 static inline void mptcp_token_init_request(struct request_sock *req) 620 { 621 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 622 } 623 624 int mptcp_token_new_request(struct request_sock *req); 625 void mptcp_token_destroy_request(struct request_sock *req); 626 int mptcp_token_new_connect(struct sock *sk); 627 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 628 struct mptcp_sock *msk); 629 bool mptcp_token_exists(u32 token); 630 struct mptcp_sock *mptcp_token_get_sock(u32 token); 631 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 632 long *s_num); 633 void mptcp_token_destroy(struct mptcp_sock *msk); 634 635 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 636 637 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 638 639 void __init mptcp_pm_init(void); 640 void mptcp_pm_data_init(struct mptcp_sock *msk); 641 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 642 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp); 643 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 644 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 645 void mptcp_pm_subflow_established(struct mptcp_sock *msk, 646 struct mptcp_subflow_context *subflow); 647 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); 648 void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 649 const struct mptcp_addr_info *addr); 650 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 651 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 652 const struct mptcp_rm_list *rm_list); 653 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 654 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 655 struct mptcp_addr_info *addr, 656 u8 bkup); 657 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 658 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 659 struct mptcp_pm_add_entry * 660 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 661 struct mptcp_addr_info *addr); 662 663 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 664 const struct mptcp_addr_info *addr, 665 bool echo, bool port); 666 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 667 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 668 669 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 670 const struct sock *ssk, gfp_t gfp); 671 void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info); 672 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 673 674 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 675 { 676 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 677 } 678 679 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 680 { 681 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 682 } 683 684 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk) 685 { 686 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6); 687 } 688 689 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk) 690 { 691 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT); 692 } 693 694 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 695 { 696 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 697 } 698 699 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 700 { 701 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 702 703 if (family == AF_INET6) 704 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 705 if (!echo) 706 len += MPTCPOPT_THMAC_LEN; 707 /* account for 2 trailing 'nop' options */ 708 if (port) 709 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 710 711 return len; 712 } 713 714 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 715 { 716 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 717 return -EINVAL; 718 719 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 720 } 721 722 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 723 struct mptcp_addr_info *saddr, bool *echo, bool *port); 724 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 725 struct mptcp_rm_list *rm_list); 726 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 727 728 void __init mptcp_pm_nl_init(void); 729 void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 730 void mptcp_pm_nl_work(struct mptcp_sock *msk); 731 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 732 const struct mptcp_rm_list *rm_list); 733 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 734 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk); 735 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk); 736 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk); 737 unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk); 738 739 static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb) 740 { 741 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 742 } 743 744 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 745 746 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 747 { 748 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 749 } 750 751 static inline bool mptcp_check_fallback(const struct sock *sk) 752 { 753 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 754 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 755 756 return __mptcp_check_fallback(msk); 757 } 758 759 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 760 { 761 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 762 pr_debug("TCP fallback already done (msk=%p)", msk); 763 return; 764 } 765 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 766 } 767 768 static inline void mptcp_do_fallback(struct sock *sk) 769 { 770 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 771 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 772 773 __mptcp_do_fallback(msk); 774 } 775 776 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 777 778 static inline bool subflow_simultaneous_connect(struct sock *sk) 779 { 780 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 781 struct sock *parent = subflow->conn; 782 783 return sk->sk_state == TCP_ESTABLISHED && 784 !mptcp_sk(parent)->pm.server_side && 785 !subflow->conn_finished; 786 } 787 788 #ifdef CONFIG_SYN_COOKIES 789 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 790 struct sk_buff *skb); 791 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 792 struct sk_buff *skb); 793 void __init mptcp_join_cookie_init(void); 794 #else 795 static inline void 796 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 797 struct sk_buff *skb) {} 798 static inline bool 799 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 800 struct sk_buff *skb) 801 { 802 return false; 803 } 804 805 static inline void mptcp_join_cookie_init(void) {} 806 #endif 807 808 #endif /* __MPTCP_PROTOCOL_H */ 809