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_RM_ADDR BIT(7) 26 #define OPTION_MPTCP_FASTCLOSE BIT(8) 27 #define OPTION_MPTCP_PRIO BIT(9) 28 #define OPTION_MPTCP_RST 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 #define MPTCPOPT_RST 8 40 41 /* MPTCP suboption lengths */ 42 #define TCPOLEN_MPTCP_MPC_SYN 4 43 #define TCPOLEN_MPTCP_MPC_SYNACK 12 44 #define TCPOLEN_MPTCP_MPC_ACK 20 45 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22 46 #define TCPOLEN_MPTCP_MPJ_SYN 12 47 #define TCPOLEN_MPTCP_MPJ_SYNACK 16 48 #define TCPOLEN_MPTCP_MPJ_ACK 24 49 #define TCPOLEN_MPTCP_DSS_BASE 4 50 #define TCPOLEN_MPTCP_DSS_ACK32 4 51 #define TCPOLEN_MPTCP_DSS_ACK64 8 52 #define TCPOLEN_MPTCP_DSS_MAP32 10 53 #define TCPOLEN_MPTCP_DSS_MAP64 14 54 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2 55 #define TCPOLEN_MPTCP_ADD_ADDR 16 56 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 57 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 58 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 59 #define TCPOLEN_MPTCP_ADD_ADDR6 28 60 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 61 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 62 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 63 #define TCPOLEN_MPTCP_PORT_LEN 2 64 #define TCPOLEN_MPTCP_PORT_ALIGN 2 65 #define TCPOLEN_MPTCP_RM_ADDR_BASE 3 66 #define TCPOLEN_MPTCP_PRIO 3 67 #define TCPOLEN_MPTCP_PRIO_ALIGN 4 68 #define TCPOLEN_MPTCP_FASTCLOSE 12 69 #define TCPOLEN_MPTCP_RST 4 70 71 #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA) 72 73 /* MPTCP MP_JOIN flags */ 74 #define MPTCPOPT_BACKUP BIT(0) 75 #define MPTCPOPT_HMAC_LEN 20 76 #define MPTCPOPT_THMAC_LEN 8 77 78 /* MPTCP MP_CAPABLE flags */ 79 #define MPTCP_VERSION_MASK (0x0F) 80 #define MPTCP_CAP_CHECKSUM_REQD BIT(7) 81 #define MPTCP_CAP_EXTENSIBILITY BIT(6) 82 #define MPTCP_CAP_DENY_JOIN_ID0 BIT(5) 83 #define MPTCP_CAP_HMAC_SHA256 BIT(0) 84 #define MPTCP_CAP_FLAG_MASK (0x1F) 85 86 /* MPTCP DSS flags */ 87 #define MPTCP_DSS_DATA_FIN BIT(4) 88 #define MPTCP_DSS_DSN64 BIT(3) 89 #define MPTCP_DSS_HAS_MAP BIT(2) 90 #define MPTCP_DSS_ACK64 BIT(1) 91 #define MPTCP_DSS_HAS_ACK BIT(0) 92 #define MPTCP_DSS_FLAG_MASK (0x1F) 93 94 /* MPTCP ADD_ADDR flags */ 95 #define MPTCP_ADDR_ECHO BIT(0) 96 97 /* MPTCP MP_PRIO flags */ 98 #define MPTCP_PRIO_BKUP BIT(0) 99 100 /* MPTCP TCPRST flags */ 101 #define MPTCP_RST_TRANSIENT BIT(0) 102 103 /* MPTCP socket flags */ 104 #define MPTCP_DATA_READY 0 105 #define MPTCP_NOSPACE 1 106 #define MPTCP_WORK_RTX 2 107 #define MPTCP_WORK_EOF 3 108 #define MPTCP_FALLBACK_DONE 4 109 #define MPTCP_WORK_CLOSE_SUBFLOW 5 110 #define MPTCP_PUSH_PENDING 6 111 #define MPTCP_CLEAN_UNA 7 112 #define MPTCP_ERROR_REPORT 8 113 #define MPTCP_RETRANSMIT 9 114 #define MPTCP_WORK_SYNC_SETSOCKOPT 10 115 #define MPTCP_CONNECTED 11 116 117 static inline bool before64(__u64 seq1, __u64 seq2) 118 { 119 return (__s64)(seq1 - seq2) < 0; 120 } 121 122 #define after64(seq2, seq1) before64(seq1, seq2) 123 124 struct mptcp_options_received { 125 u64 sndr_key; 126 u64 rcvr_key; 127 u64 data_ack; 128 u64 data_seq; 129 u32 subflow_seq; 130 u16 data_len; 131 __sum16 csum; 132 u16 mp_capable : 1, 133 mp_join : 1, 134 fastclose : 1, 135 reset : 1, 136 dss : 1, 137 add_addr : 1, 138 rm_addr : 1, 139 mp_prio : 1, 140 echo : 1, 141 csum_reqd : 1, 142 backup : 1, 143 deny_join_id0 : 1; 144 u32 token; 145 u32 nonce; 146 u64 thmac; 147 u8 hmac[MPTCPOPT_HMAC_LEN]; 148 u8 join_id; 149 u8 use_map:1, 150 dsn64:1, 151 data_fin:1, 152 use_ack:1, 153 ack64:1, 154 mpc_map:1, 155 __unused:2; 156 struct mptcp_addr_info addr; 157 struct mptcp_rm_list rm_list; 158 u64 ahmac; 159 u8 reset_reason:4; 160 u8 reset_transient:1; 161 }; 162 163 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 164 { 165 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 166 ((nib & 0xF) << 8) | field); 167 } 168 169 enum mptcp_pm_status { 170 MPTCP_PM_ADD_ADDR_RECEIVED, 171 MPTCP_PM_ADD_ADDR_SEND_ACK, 172 MPTCP_PM_RM_ADDR_RECEIVED, 173 MPTCP_PM_ESTABLISHED, 174 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 175 MPTCP_PM_SUBFLOW_ESTABLISHED, 176 }; 177 178 enum mptcp_addr_signal_status { 179 MPTCP_ADD_ADDR_SIGNAL, 180 MPTCP_ADD_ADDR_ECHO, 181 MPTCP_ADD_ADDR_IPV6, 182 MPTCP_ADD_ADDR_PORT, 183 MPTCP_RM_ADDR_SIGNAL, 184 }; 185 186 struct mptcp_pm_data { 187 struct mptcp_addr_info local; 188 struct mptcp_addr_info remote; 189 struct list_head anno_list; 190 191 spinlock_t lock; /*protects the whole PM data */ 192 193 u8 addr_signal; 194 bool server_side; 195 bool work_pending; 196 bool accept_addr; 197 bool accept_subflow; 198 bool remote_deny_join_id0; 199 u8 add_addr_signaled; 200 u8 add_addr_accepted; 201 u8 local_addr_used; 202 u8 subflows; 203 u8 status; 204 struct mptcp_rm_list rm_list_tx; 205 struct mptcp_rm_list rm_list_rx; 206 }; 207 208 struct mptcp_data_frag { 209 struct list_head list; 210 u64 data_seq; 211 u16 data_len; 212 u16 offset; 213 u16 overhead; 214 u16 already_sent; 215 struct page *page; 216 }; 217 218 /* MPTCP connection sock */ 219 struct mptcp_sock { 220 /* inet_connection_sock must be the first member */ 221 struct inet_connection_sock sk; 222 u64 local_key; 223 u64 remote_key; 224 u64 write_seq; 225 u64 snd_nxt; 226 u64 ack_seq; 227 u64 rcv_wnd_sent; 228 u64 rcv_data_fin_seq; 229 int wmem_reserved; 230 struct sock *last_snd; 231 int snd_burst; 232 int old_wspace; 233 u64 snd_una; 234 u64 wnd_end; 235 unsigned long timer_ival; 236 u32 token; 237 int rmem_released; 238 unsigned long flags; 239 bool can_ack; 240 bool fully_established; 241 bool rcv_data_fin; 242 bool snd_data_fin_enable; 243 bool rcv_fastclose; 244 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 245 bool csum_enabled; 246 spinlock_t join_list_lock; 247 struct work_struct work; 248 struct sk_buff *ooo_last_skb; 249 struct rb_root out_of_order_queue; 250 struct sk_buff_head receive_queue; 251 int tx_pending_data; 252 struct list_head conn_list; 253 struct list_head rtx_queue; 254 struct mptcp_data_frag *first_pending; 255 struct list_head join_list; 256 struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 257 struct sock *first; 258 struct mptcp_pm_data pm; 259 struct { 260 u32 space; /* bytes copied in last measurement window */ 261 u32 copied; /* bytes copied in this measurement window */ 262 u64 time; /* start time of measurement window */ 263 u64 rtt_us; /* last maximum rtt of subflows */ 264 } rcvq_space; 265 266 u32 setsockopt_seq; 267 char ca_name[TCP_CA_NAME_MAX]; 268 }; 269 270 #define mptcp_lock_sock(___sk, cb) do { \ 271 struct sock *__sk = (___sk); /* silence macro reuse warning */ \ 272 might_sleep(); \ 273 spin_lock_bh(&__sk->sk_lock.slock); \ 274 if (__sk->sk_lock.owned) \ 275 __lock_sock(__sk); \ 276 cb; \ 277 __sk->sk_lock.owned = 1; \ 278 spin_unlock(&__sk->sk_lock.slock); \ 279 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \ 280 local_bh_enable(); \ 281 } while (0) 282 283 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 284 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 285 286 #define mptcp_for_each_subflow(__msk, __subflow) \ 287 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 288 289 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 290 { 291 sock_owned_by_me((const struct sock *)msk); 292 } 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_released); 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_head(const struct sock *sk) 335 { 336 struct mptcp_sock *msk = mptcp_sk(sk); 337 338 if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 339 return NULL; 340 341 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 342 } 343 344 struct csum_pseudo_header { 345 __be64 data_seq; 346 __be32 subflow_seq; 347 __be16 data_len; 348 __sum16 csum; 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 csum_reqd : 1, 357 allow_join_id0 : 1; 358 u8 local_id; 359 u8 remote_id; 360 u64 local_key; 361 u64 idsn; 362 u32 token; 363 u32 ssn_offset; 364 u64 thmac; 365 u32 local_nonce; 366 u32 remote_nonce; 367 struct mptcp_sock *msk; 368 struct hlist_nulls_node token_node; 369 }; 370 371 static inline struct mptcp_subflow_request_sock * 372 mptcp_subflow_rsk(const struct request_sock *rsk) 373 { 374 return (struct mptcp_subflow_request_sock *)rsk; 375 } 376 377 enum mptcp_data_avail { 378 MPTCP_SUBFLOW_NODATA, 379 MPTCP_SUBFLOW_DATA_AVAIL, 380 }; 381 382 struct mptcp_delegated_action { 383 struct napi_struct napi; 384 struct list_head head; 385 }; 386 387 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 388 389 #define MPTCP_DELEGATE_SEND 0 390 391 /* MPTCP subflow context */ 392 struct mptcp_subflow_context { 393 struct list_head node;/* conn_list of subflows */ 394 u64 local_key; 395 u64 remote_key; 396 u64 idsn; 397 u64 map_seq; 398 u32 snd_isn; 399 u32 token; 400 u32 rel_write_seq; 401 u32 map_subflow_seq; 402 u32 ssn_offset; 403 u32 map_data_len; 404 __wsum map_data_csum; 405 u32 map_csum_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 map_csum_reqd : 1, 416 map_data_fin : 1, 417 mpc_map : 1, 418 backup : 1, 419 send_mp_prio : 1, 420 rx_eof : 1, 421 can_ack : 1, /* only after processing the remote a key */ 422 disposable : 1; /* ctx can be free at ulp release time */ 423 enum mptcp_data_avail data_avail; 424 u32 remote_nonce; 425 u64 thmac; 426 u32 local_nonce; 427 u32 remote_token; 428 u8 hmac[MPTCPOPT_HMAC_LEN]; 429 u8 local_id; 430 u8 remote_id; 431 u8 reset_seen:1; 432 u8 reset_transient:1; 433 u8 reset_reason:4; 434 435 long delegated_status; 436 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 437 438 u32 setsockopt_seq; 439 440 struct sock *tcp_sock; /* tcp sk backpointer */ 441 struct sock *conn; /* parent mptcp_sock */ 442 const struct inet_connection_sock_af_ops *icsk_af_ops; 443 void (*tcp_data_ready)(struct sock *sk); 444 void (*tcp_state_change)(struct sock *sk); 445 void (*tcp_write_space)(struct sock *sk); 446 void (*tcp_error_report)(struct sock *sk); 447 448 struct rcu_head rcu; 449 }; 450 451 static inline struct mptcp_subflow_context * 452 mptcp_subflow_ctx(const struct sock *sk) 453 { 454 struct inet_connection_sock *icsk = inet_csk(sk); 455 456 /* Use RCU on icsk_ulp_data only for sock diag code */ 457 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 458 } 459 460 static inline struct sock * 461 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 462 { 463 return subflow->tcp_sock; 464 } 465 466 static inline u64 467 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 468 { 469 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 470 subflow->ssn_offset - 471 subflow->map_subflow_seq; 472 } 473 474 static inline u64 475 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 476 { 477 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 478 } 479 480 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, 481 struct mptcp_subflow_context *subflow) 482 { 483 sock_hold(mptcp_subflow_tcp_sock(subflow)); 484 spin_lock_bh(&msk->join_list_lock); 485 list_add_tail(&subflow->node, &msk->join_list); 486 spin_unlock_bh(&msk->join_list_lock); 487 } 488 489 void mptcp_subflow_process_delegated(struct sock *ssk); 490 491 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow) 492 { 493 struct mptcp_delegated_action *delegated; 494 bool schedule; 495 496 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and 497 * ensures the below list check sees list updates done prior to status 498 * bit changes 499 */ 500 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) { 501 /* still on delegated list from previous scheduling */ 502 if (!list_empty(&subflow->delegated_node)) 503 return; 504 505 /* the caller held the subflow bh socket lock */ 506 lockdep_assert_in_softirq(); 507 508 delegated = this_cpu_ptr(&mptcp_delegated_actions); 509 schedule = list_empty(&delegated->head); 510 list_add_tail(&subflow->delegated_node, &delegated->head); 511 sock_hold(mptcp_subflow_tcp_sock(subflow)); 512 if (schedule) 513 napi_schedule(&delegated->napi); 514 } 515 } 516 517 static inline struct mptcp_subflow_context * 518 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 519 { 520 struct mptcp_subflow_context *ret; 521 522 if (list_empty(&delegated->head)) 523 return NULL; 524 525 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 526 list_del_init(&ret->delegated_node); 527 return ret; 528 } 529 530 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow) 531 { 532 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 533 } 534 535 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow) 536 { 537 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before 538 * touching the status bit 539 */ 540 smp_wmb(); 541 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 542 } 543 544 int mptcp_is_enabled(struct net *net); 545 unsigned int mptcp_get_add_addr_timeout(struct net *net); 546 int mptcp_is_checksum_enabled(struct net *net); 547 int mptcp_allow_join_id0(struct net *net); 548 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 549 struct mptcp_options_received *mp_opt); 550 bool mptcp_subflow_data_available(struct sock *sk); 551 void __init mptcp_subflow_init(void); 552 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 553 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 554 struct mptcp_subflow_context *subflow); 555 void mptcp_subflow_reset(struct sock *ssk); 556 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 557 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk); 558 559 /* called with sk socket lock held */ 560 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 561 const struct mptcp_addr_info *remote, 562 u8 flags, int ifindex); 563 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 564 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 565 struct sockaddr_storage *addr, 566 unsigned short family); 567 568 static inline bool mptcp_subflow_active(struct mptcp_subflow_context *subflow) 569 { 570 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 571 572 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 573 if (subflow->request_join && !subflow->fully_established) 574 return false; 575 576 /* only send if our side has not closed yet */ 577 return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 578 } 579 580 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 581 struct mptcp_subflow_context *ctx) 582 { 583 sk->sk_data_ready = ctx->tcp_data_ready; 584 sk->sk_state_change = ctx->tcp_state_change; 585 sk->sk_write_space = ctx->tcp_write_space; 586 sk->sk_error_report = ctx->tcp_error_report; 587 588 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 589 } 590 591 void __init mptcp_proto_init(void); 592 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 593 int __init mptcp_proto_v6_init(void); 594 #endif 595 596 struct sock *mptcp_sk_clone(const struct sock *sk, 597 const struct mptcp_options_received *mp_opt, 598 struct request_sock *req); 599 void mptcp_get_options(const struct sock *sk, 600 const struct sk_buff *skb, 601 struct mptcp_options_received *mp_opt); 602 603 void mptcp_finish_connect(struct sock *sk); 604 void __mptcp_set_connected(struct sock *sk); 605 static inline bool mptcp_is_fully_established(struct sock *sk) 606 { 607 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 608 READ_ONCE(mptcp_sk(sk)->fully_established); 609 } 610 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 611 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 612 bool mptcp_finish_join(struct sock *sk); 613 bool mptcp_schedule_work(struct sock *sk); 614 int mptcp_setsockopt(struct sock *sk, int level, int optname, 615 sockptr_t optval, unsigned int optlen); 616 int mptcp_getsockopt(struct sock *sk, int level, int optname, 617 char __user *optval, int __user *option); 618 619 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 620 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 621 { 622 if (use_64bit) 623 return cur_seq; 624 625 return __mptcp_expand_seq(old_seq, cur_seq); 626 } 627 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 628 void __mptcp_data_acked(struct sock *sk); 629 void __mptcp_error_report(struct sock *sk); 630 void mptcp_subflow_eof(struct sock *sk); 631 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 632 void __mptcp_flush_join_list(struct mptcp_sock *msk); 633 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 634 { 635 return READ_ONCE(msk->snd_data_fin_enable) && 636 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 637 } 638 639 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 640 { 641 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 642 return false; 643 644 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 645 return true; 646 } 647 648 static inline void mptcp_write_space(struct sock *sk) 649 { 650 if (sk_stream_is_writeable(sk)) { 651 /* pairs with memory barrier in mptcp_poll */ 652 smp_mb(); 653 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 654 sk_stream_write_space(sk); 655 } 656 } 657 658 void mptcp_destroy_common(struct mptcp_sock *msk); 659 660 #define MPTCP_TOKEN_MAX_RETRIES 4 661 662 void __init mptcp_token_init(void); 663 static inline void mptcp_token_init_request(struct request_sock *req) 664 { 665 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 666 } 667 668 int mptcp_token_new_request(struct request_sock *req); 669 void mptcp_token_destroy_request(struct request_sock *req); 670 int mptcp_token_new_connect(struct sock *sk); 671 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 672 struct mptcp_sock *msk); 673 bool mptcp_token_exists(u32 token); 674 struct mptcp_sock *mptcp_token_get_sock(u32 token); 675 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 676 long *s_num); 677 void mptcp_token_destroy(struct mptcp_sock *msk); 678 679 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 680 681 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 682 683 void __init mptcp_pm_init(void); 684 void mptcp_pm_data_init(struct mptcp_sock *msk); 685 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 686 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp); 687 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 688 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 689 void mptcp_pm_subflow_established(struct mptcp_sock *msk); 690 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); 691 void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 692 const struct mptcp_addr_info *addr); 693 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 694 struct mptcp_addr_info *addr); 695 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 696 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 697 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 698 const struct mptcp_rm_list *rm_list); 699 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 700 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 701 struct mptcp_addr_info *addr, 702 u8 bkup); 703 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 704 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 705 struct mptcp_pm_add_entry * 706 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 707 struct mptcp_addr_info *addr, bool check_id); 708 struct mptcp_pm_add_entry * 709 mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk, 710 struct mptcp_addr_info *addr); 711 712 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 713 const struct mptcp_addr_info *addr, 714 bool echo); 715 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 716 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 717 718 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 719 const struct sock *ssk, gfp_t gfp); 720 void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info); 721 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 722 723 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 724 { 725 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 726 } 727 728 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 729 { 730 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 731 } 732 733 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk) 734 { 735 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6); 736 } 737 738 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk) 739 { 740 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT); 741 } 742 743 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 744 { 745 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 746 } 747 748 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 749 { 750 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 751 752 if (family == AF_INET6) 753 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 754 if (!echo) 755 len += MPTCPOPT_THMAC_LEN; 756 /* account for 2 trailing 'nop' options */ 757 if (port) 758 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 759 760 return len; 761 } 762 763 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 764 { 765 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 766 return -EINVAL; 767 768 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 769 } 770 771 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 772 struct mptcp_addr_info *saddr, bool *echo, bool *port); 773 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 774 struct mptcp_rm_list *rm_list); 775 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 776 777 void __init mptcp_pm_nl_init(void); 778 void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 779 void mptcp_pm_nl_work(struct mptcp_sock *msk); 780 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 781 const struct mptcp_rm_list *rm_list); 782 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 783 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk); 784 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk); 785 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk); 786 unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk); 787 788 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 789 void mptcp_sockopt_sync_all(struct mptcp_sock *msk); 790 791 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 792 { 793 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 794 } 795 796 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 797 798 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 799 { 800 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 801 } 802 803 static inline bool mptcp_check_fallback(const struct sock *sk) 804 { 805 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 806 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 807 808 return __mptcp_check_fallback(msk); 809 } 810 811 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 812 { 813 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 814 pr_debug("TCP fallback already done (msk=%p)", msk); 815 return; 816 } 817 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 818 } 819 820 static inline void mptcp_do_fallback(struct sock *sk) 821 { 822 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 823 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 824 825 __mptcp_do_fallback(msk); 826 } 827 828 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 829 830 static inline bool subflow_simultaneous_connect(struct sock *sk) 831 { 832 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 833 struct sock *parent = subflow->conn; 834 835 return sk->sk_state == TCP_ESTABLISHED && 836 !mptcp_sk(parent)->pm.server_side && 837 !subflow->conn_finished; 838 } 839 840 #ifdef CONFIG_SYN_COOKIES 841 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 842 struct sk_buff *skb); 843 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 844 struct sk_buff *skb); 845 void __init mptcp_join_cookie_init(void); 846 #else 847 static inline void 848 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 849 struct sk_buff *skb) {} 850 static inline bool 851 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 852 struct sk_buff *skb) 853 { 854 return false; 855 } 856 857 static inline void mptcp_join_cookie_init(void) {} 858 #endif 859 860 #endif /* __MPTCP_PROTOCOL_H */ 861