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