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#include <net/genetlink.h> 15 16#define MPTCP_SUPPORTED_VERSION 1 17 18/* MPTCP option bits */ 19#define OPTION_MPTCP_MPC_SYN BIT(0) 20#define OPTION_MPTCP_MPC_SYNACK BIT(1) 21#define OPTION_MPTCP_MPC_ACK BIT(2) 22#define OPTION_MPTCP_MPJ_SYN BIT(3) 23#define OPTION_MPTCP_MPJ_SYNACK BIT(4) 24#define OPTION_MPTCP_MPJ_ACK BIT(5) 25#define OPTION_MPTCP_ADD_ADDR BIT(6) 26#define OPTION_MPTCP_RM_ADDR BIT(7) 27#define OPTION_MPTCP_FASTCLOSE BIT(8) 28#define OPTION_MPTCP_PRIO BIT(9) 29#define OPTION_MPTCP_RST BIT(10) 30#define OPTION_MPTCP_DSS BIT(11) 31#define OPTION_MPTCP_FAIL BIT(12) 32 33#define OPTION_MPTCP_CSUMREQD BIT(13) 34 35#define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \ 36 OPTION_MPTCP_MPC_ACK) 37#define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \ 38 OPTION_MPTCP_MPJ_ACK) 39 40/* MPTCP option subtypes */ 41#define MPTCPOPT_MP_CAPABLE 0 42#define MPTCPOPT_MP_JOIN 1 43#define MPTCPOPT_DSS 2 44#define MPTCPOPT_ADD_ADDR 3 45#define MPTCPOPT_RM_ADDR 4 46#define MPTCPOPT_MP_PRIO 5 47#define MPTCPOPT_MP_FAIL 6 48#define MPTCPOPT_MP_FASTCLOSE 7 49#define MPTCPOPT_RST 8 50 51/* MPTCP suboption lengths */ 52#define TCPOLEN_MPTCP_MPC_SYN 4 53#define TCPOLEN_MPTCP_MPC_SYNACK 12 54#define TCPOLEN_MPTCP_MPC_ACK 20 55#define TCPOLEN_MPTCP_MPC_ACK_DATA 22 56#define TCPOLEN_MPTCP_MPJ_SYN 12 57#define TCPOLEN_MPTCP_MPJ_SYNACK 16 58#define TCPOLEN_MPTCP_MPJ_ACK 24 59#define TCPOLEN_MPTCP_DSS_BASE 4 60#define TCPOLEN_MPTCP_DSS_ACK32 4 61#define TCPOLEN_MPTCP_DSS_ACK64 8 62#define TCPOLEN_MPTCP_DSS_MAP32 10 63#define TCPOLEN_MPTCP_DSS_MAP64 14 64#define TCPOLEN_MPTCP_DSS_CHECKSUM 2 65#define TCPOLEN_MPTCP_ADD_ADDR 16 66#define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 67#define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 68#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 69#define TCPOLEN_MPTCP_ADD_ADDR6 28 70#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 71#define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 72#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 73#define TCPOLEN_MPTCP_PORT_LEN 2 74#define TCPOLEN_MPTCP_PORT_ALIGN 2 75#define TCPOLEN_MPTCP_RM_ADDR_BASE 3 76#define TCPOLEN_MPTCP_PRIO 3 77#define TCPOLEN_MPTCP_PRIO_ALIGN 4 78#define TCPOLEN_MPTCP_FASTCLOSE 12 79#define TCPOLEN_MPTCP_RST 4 80#define TCPOLEN_MPTCP_FAIL 12 81 82#define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA) 83 84/* MPTCP MP_JOIN flags */ 85#define MPTCPOPT_BACKUP BIT(0) 86#define MPTCPOPT_THMAC_LEN 8 87 88/* MPTCP MP_CAPABLE flags */ 89#define MPTCP_VERSION_MASK (0x0F) 90#define MPTCP_CAP_CHECKSUM_REQD BIT(7) 91#define MPTCP_CAP_EXTENSIBILITY BIT(6) 92#define MPTCP_CAP_DENY_JOIN_ID0 BIT(5) 93#define MPTCP_CAP_HMAC_SHA256 BIT(0) 94#define MPTCP_CAP_FLAG_MASK (0x1F) 95 96/* MPTCP DSS flags */ 97#define MPTCP_DSS_DATA_FIN BIT(4) 98#define MPTCP_DSS_DSN64 BIT(3) 99#define MPTCP_DSS_HAS_MAP BIT(2) 100#define MPTCP_DSS_ACK64 BIT(1) 101#define MPTCP_DSS_HAS_ACK BIT(0) 102#define MPTCP_DSS_FLAG_MASK (0x1F) 103 104/* MPTCP ADD_ADDR flags */ 105#define MPTCP_ADDR_ECHO BIT(0) 106 107/* MPTCP MP_PRIO flags */ 108#define MPTCP_PRIO_BKUP BIT(0) 109 110/* MPTCP TCPRST flags */ 111#define MPTCP_RST_TRANSIENT BIT(0) 112 113/* MPTCP socket atomic flags */ 114#define MPTCP_NOSPACE 1 115#define MPTCP_WORK_RTX 2 116#define MPTCP_FALLBACK_DONE 4 117#define MPTCP_WORK_CLOSE_SUBFLOW 5 118 119/* MPTCP socket release cb flags */ 120#define MPTCP_PUSH_PENDING 1 121#define MPTCP_CLEAN_UNA 2 122#define MPTCP_ERROR_REPORT 3 123#define MPTCP_RETRANSMIT 4 124#define MPTCP_FLUSH_JOIN_LIST 5 125#define MPTCP_SYNC_STATE 6 126#define MPTCP_SYNC_SNDBUF 7 127 128struct mptcp_skb_cb { 129 u64 map_seq; 130 u64 end_seq; 131 u32 offset; 132 u8 has_rxtstamp:1; 133}; 134 135#define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) 136 137static inline bool before64(__u64 seq1, __u64 seq2) 138{ 139 return (__s64)(seq1 - seq2) < 0; 140} 141 142#define after64(seq2, seq1) before64(seq1, seq2) 143 144struct mptcp_options_received { 145 u64 sndr_key; 146 u64 rcvr_key; 147 u64 data_ack; 148 u64 data_seq; 149 u32 subflow_seq; 150 u16 data_len; 151 __sum16 csum; 152 u16 suboptions; 153 u32 token; 154 u32 nonce; 155 u16 use_map:1, 156 dsn64:1, 157 data_fin:1, 158 use_ack:1, 159 ack64:1, 160 mpc_map:1, 161 reset_reason:4, 162 reset_transient:1, 163 echo:1, 164 backup:1, 165 deny_join_id0:1, 166 __unused:2; 167 u8 join_id; 168 u64 thmac; 169 u8 hmac[MPTCPOPT_HMAC_LEN]; 170 struct mptcp_addr_info addr; 171 struct mptcp_rm_list rm_list; 172 u64 ahmac; 173 u64 fail_seq; 174}; 175 176static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 177{ 178 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 179 ((nib & 0xF) << 8) | field); 180} 181 182enum mptcp_pm_status { 183 MPTCP_PM_ADD_ADDR_RECEIVED, 184 MPTCP_PM_ADD_ADDR_SEND_ACK, 185 MPTCP_PM_RM_ADDR_RECEIVED, 186 MPTCP_PM_ESTABLISHED, 187 MPTCP_PM_SUBFLOW_ESTABLISHED, 188 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 189 MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is 190 * accounted int id_avail_bitmap 191 */ 192}; 193 194enum mptcp_pm_type { 195 MPTCP_PM_TYPE_KERNEL = 0, 196 MPTCP_PM_TYPE_USERSPACE, 197 198 __MPTCP_PM_TYPE_NR, 199 __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1, 200}; 201 202/* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */ 203#define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1) 204 205enum mptcp_addr_signal_status { 206 MPTCP_ADD_ADDR_SIGNAL, 207 MPTCP_ADD_ADDR_ECHO, 208 MPTCP_RM_ADDR_SIGNAL, 209}; 210 211/* max value of mptcp_addr_info.id */ 212#define MPTCP_PM_MAX_ADDR_ID U8_MAX 213 214struct mptcp_pm_data { 215 struct mptcp_addr_info local; 216 struct mptcp_addr_info remote; 217 struct list_head anno_list; 218 struct list_head userspace_pm_local_addr_list; 219 220 spinlock_t lock; /*protects the whole PM data */ 221 222 u8 addr_signal; 223 bool server_side; 224 bool work_pending; 225 bool accept_addr; 226 bool accept_subflow; 227 bool remote_deny_join_id0; 228 u8 add_addr_signaled; 229 u8 add_addr_accepted; 230 u8 local_addr_used; 231 u8 pm_type; 232 u8 subflows; 233 u8 status; 234 DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 235 struct mptcp_rm_list rm_list_tx; 236 struct mptcp_rm_list rm_list_rx; 237}; 238 239struct mptcp_pm_addr_entry { 240 struct list_head list; 241 struct mptcp_addr_info addr; 242 u8 flags; 243 int ifindex; 244 struct socket *lsk; 245}; 246 247struct mptcp_data_frag { 248 struct list_head list; 249 u64 data_seq; 250 u16 data_len; 251 u16 offset; 252 u16 overhead; 253 u16 already_sent; 254 struct page *page; 255}; 256 257/* MPTCP connection sock */ 258struct mptcp_sock { 259 /* inet_connection_sock must be the first member */ 260 struct inet_connection_sock sk; 261 u64 local_key; 262 u64 remote_key; 263 u64 write_seq; 264 u64 bytes_sent; 265 u64 snd_nxt; 266 u64 bytes_received; 267 u64 ack_seq; 268 atomic64_t rcv_wnd_sent; 269 u64 rcv_data_fin_seq; 270 u64 bytes_retrans; 271 int rmem_fwd_alloc; 272 int snd_burst; 273 int old_wspace; 274 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 275 * recovery related fields are under data_lock 276 * protection 277 */ 278 u64 bytes_acked; 279 u64 snd_una; 280 u64 wnd_end; 281 unsigned long timer_ival; 282 u32 token; 283 int rmem_released; 284 unsigned long flags; 285 unsigned long cb_flags; 286 bool recovery; /* closing subflow write queue reinjected */ 287 bool can_ack; 288 bool fully_established; 289 bool rcv_data_fin; 290 bool snd_data_fin_enable; 291 bool rcv_fastclose; 292 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 293 bool csum_enabled; 294 bool allow_infinite_fallback; 295 u8 pending_state; /* A subflow asked to set this sk_state, 296 * protected by the msk data lock 297 */ 298 u8 mpc_endpoint_id; 299 u8 recvmsg_inq:1, 300 cork:1, 301 nodelay:1, 302 fastopening:1, 303 in_accept_queue:1, 304 free_first:1, 305 rcvspace_init:1; 306 struct work_struct work; 307 struct sk_buff *ooo_last_skb; 308 struct rb_root out_of_order_queue; 309 struct sk_buff_head receive_queue; 310 struct list_head conn_list; 311 struct list_head rtx_queue; 312 struct mptcp_data_frag *first_pending; 313 struct list_head join_list; 314 struct sock *first; /* The mptcp ops can safely dereference, using suitable 315 * ONCE annotation, the subflow outside the socket 316 * lock as such sock is freed after close(). 317 */ 318 struct mptcp_pm_data pm; 319 struct mptcp_sched_ops *sched; 320 struct { 321 u32 space; /* bytes copied in last measurement window */ 322 u32 copied; /* bytes copied in this measurement window */ 323 u64 time; /* start time of measurement window */ 324 u64 rtt_us; /* last maximum rtt of subflows */ 325 } rcvq_space; 326 u8 scaling_ratio; 327 328 u32 subflow_id; 329 u32 setsockopt_seq; 330 char ca_name[TCP_CA_NAME_MAX]; 331}; 332 333#define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 334#define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 335 336#define mptcp_for_each_subflow(__msk, __subflow) \ 337 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 338#define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 339 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 340 341static inline void msk_owned_by_me(const struct mptcp_sock *msk) 342{ 343 sock_owned_by_me((const struct sock *)msk); 344} 345 346#define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 347 348/* the msk socket don't use the backlog, also account for the bulk 349 * free memory 350 */ 351static inline int __mptcp_rmem(const struct sock *sk) 352{ 353 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 354} 355 356static inline int mptcp_win_from_space(const struct sock *sk, int space) 357{ 358 return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); 359} 360 361static inline int __mptcp_space(const struct sock *sk) 362{ 363 return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 364} 365 366static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 367{ 368 const struct mptcp_sock *msk = mptcp_sk(sk); 369 370 return READ_ONCE(msk->first_pending); 371} 372 373static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 374{ 375 struct mptcp_sock *msk = mptcp_sk(sk); 376 struct mptcp_data_frag *cur; 377 378 cur = msk->first_pending; 379 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 380 list_next_entry(cur, list); 381} 382 383static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 384{ 385 const struct mptcp_sock *msk = mptcp_sk(sk); 386 387 if (!msk->first_pending) 388 return NULL; 389 390 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 391 return NULL; 392 393 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 394} 395 396static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 397{ 398 struct mptcp_sock *msk = mptcp_sk(sk); 399 400 if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 401 return NULL; 402 403 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 404} 405 406struct csum_pseudo_header { 407 __be64 data_seq; 408 __be32 subflow_seq; 409 __be16 data_len; 410 __sum16 csum; 411}; 412 413struct mptcp_subflow_request_sock { 414 struct tcp_request_sock sk; 415 u16 mp_capable : 1, 416 mp_join : 1, 417 backup : 1, 418 csum_reqd : 1, 419 allow_join_id0 : 1; 420 u8 local_id; 421 u8 remote_id; 422 u64 local_key; 423 u64 idsn; 424 u32 token; 425 u32 ssn_offset; 426 u64 thmac; 427 u32 local_nonce; 428 u32 remote_nonce; 429 struct mptcp_sock *msk; 430 struct hlist_nulls_node token_node; 431}; 432 433static inline struct mptcp_subflow_request_sock * 434mptcp_subflow_rsk(const struct request_sock *rsk) 435{ 436 return (struct mptcp_subflow_request_sock *)rsk; 437} 438 439enum mptcp_data_avail { 440 MPTCP_SUBFLOW_NODATA, 441 MPTCP_SUBFLOW_DATA_AVAIL, 442}; 443 444struct mptcp_delegated_action { 445 struct napi_struct napi; 446 struct list_head head; 447}; 448 449DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 450 451#define MPTCP_DELEGATE_SCHEDULED 0 452#define MPTCP_DELEGATE_SEND 1 453#define MPTCP_DELEGATE_ACK 2 454#define MPTCP_DELEGATE_SNDBUF 3 455 456#define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 457/* MPTCP subflow context */ 458struct mptcp_subflow_context { 459 struct list_head node;/* conn_list of subflows */ 460 461 struct_group(reset, 462 463 unsigned long avg_pacing_rate; /* protected by msk socket lock */ 464 u64 local_key; 465 u64 remote_key; 466 u64 idsn; 467 u64 map_seq; 468 u32 snd_isn; 469 u32 token; 470 u32 rel_write_seq; 471 u32 map_subflow_seq; 472 u32 ssn_offset; 473 u32 map_data_len; 474 __wsum map_data_csum; 475 u32 map_csum_len; 476 u32 request_mptcp : 1, /* send MP_CAPABLE */ 477 request_join : 1, /* send MP_JOIN */ 478 request_bkup : 1, 479 mp_capable : 1, /* remote is MPTCP capable */ 480 mp_join : 1, /* remote is JOINing */ 481 fully_established : 1, /* path validated */ 482 pm_notified : 1, /* PM hook called for established status */ 483 conn_finished : 1, 484 map_valid : 1, 485 map_csum_reqd : 1, 486 map_data_fin : 1, 487 mpc_map : 1, 488 backup : 1, 489 send_mp_prio : 1, 490 send_mp_fail : 1, 491 send_fastclose : 1, 492 send_infinite_map : 1, 493 remote_key_valid : 1, /* received the peer key from */ 494 disposable : 1, /* ctx can be free at ulp release time */ 495 stale : 1, /* unable to snd/rcv data, do not use for xmit */ 496 valid_csum_seen : 1, /* at least one csum validated */ 497 is_mptfo : 1, /* subflow is doing TFO */ 498 __unused : 10; 499 enum mptcp_data_avail data_avail; 500 bool scheduled; 501 u32 remote_nonce; 502 u64 thmac; 503 u32 local_nonce; 504 u32 remote_token; 505 union { 506 u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 507 u64 iasn; /* initial ack sequence number, MPC subflows only */ 508 }; 509 s16 local_id; /* if negative not initialized yet */ 510 u8 remote_id; 511 u8 reset_seen:1; 512 u8 reset_transient:1; 513 u8 reset_reason:4; 514 u8 stale_count; 515 516 u32 subflow_id; 517 518 long delegated_status; 519 unsigned long fail_tout; 520 521 ); 522 523 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 524 525 u32 setsockopt_seq; 526 u32 stale_rcv_tstamp; 527 int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, 528 * protected by the msk socket lock 529 */ 530 531 struct sock *tcp_sock; /* tcp sk backpointer */ 532 struct sock *conn; /* parent mptcp_sock */ 533 const struct inet_connection_sock_af_ops *icsk_af_ops; 534 void (*tcp_state_change)(struct sock *sk); 535 void (*tcp_error_report)(struct sock *sk); 536 537 struct rcu_head rcu; 538}; 539 540static inline struct mptcp_subflow_context * 541mptcp_subflow_ctx(const struct sock *sk) 542{ 543 struct inet_connection_sock *icsk = inet_csk(sk); 544 545 /* Use RCU on icsk_ulp_data only for sock diag code */ 546 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 547} 548 549static inline struct sock * 550mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 551{ 552 return subflow->tcp_sock; 553} 554 555static inline void 556mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 557{ 558 memset(&subflow->reset, 0, sizeof(subflow->reset)); 559 subflow->request_mptcp = 1; 560 WRITE_ONCE(subflow->local_id, -1); 561} 562 563static inline u64 564mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 565{ 566 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 567 subflow->ssn_offset - 568 subflow->map_subflow_seq; 569} 570 571static inline u64 572mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 573{ 574 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 575} 576 577void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 578 579static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 580{ 581 long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 582 struct mptcp_delegated_action *delegated; 583 bool schedule; 584 585 /* the caller held the subflow bh socket lock */ 586 lockdep_assert_in_softirq(); 587 588 /* The implied barrier pairs with tcp_release_cb_override() 589 * mptcp_napi_poll(), and ensures the below list check sees list 590 * updates done prior to delegated status bits changes 591 */ 592 old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 593 if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 594 if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 595 return; 596 597 delegated = this_cpu_ptr(&mptcp_delegated_actions); 598 schedule = list_empty(&delegated->head); 599 list_add_tail(&subflow->delegated_node, &delegated->head); 600 sock_hold(mptcp_subflow_tcp_sock(subflow)); 601 if (schedule) 602 napi_schedule(&delegated->napi); 603 } 604} 605 606static inline struct mptcp_subflow_context * 607mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 608{ 609 struct mptcp_subflow_context *ret; 610 611 if (list_empty(&delegated->head)) 612 return NULL; 613 614 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 615 list_del_init(&ret->delegated_node); 616 return ret; 617} 618 619int mptcp_is_enabled(const struct net *net); 620unsigned int mptcp_get_add_addr_timeout(const struct net *net); 621int mptcp_is_checksum_enabled(const struct net *net); 622int mptcp_allow_join_id0(const struct net *net); 623unsigned int mptcp_stale_loss_cnt(const struct net *net); 624int mptcp_get_pm_type(const struct net *net); 625const char *mptcp_get_scheduler(const struct net *net); 626void __mptcp_subflow_fully_established(struct mptcp_sock *msk, 627 struct mptcp_subflow_context *subflow, 628 const struct mptcp_options_received *mp_opt); 629bool __mptcp_retransmit_pending_data(struct sock *sk); 630void mptcp_check_and_set_pending(struct sock *sk); 631void __mptcp_push_pending(struct sock *sk, unsigned int flags); 632bool mptcp_subflow_data_available(struct sock *sk); 633void __init mptcp_subflow_init(void); 634void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 635void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 636 struct mptcp_subflow_context *subflow); 637void __mptcp_subflow_send_ack(struct sock *ssk); 638void mptcp_subflow_reset(struct sock *ssk); 639void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 640void mptcp_sock_graft(struct sock *sk, struct socket *parent); 641struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 642bool __mptcp_close(struct sock *sk, long timeout); 643void mptcp_cancel_work(struct sock *sk); 644void __mptcp_unaccepted_force_close(struct sock *sk); 645void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 646void mptcp_set_state(struct sock *sk, int state); 647 648bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 649 const struct mptcp_addr_info *b, bool use_port); 650void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 651 652/* called with sk socket lock held */ 653int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 654 const struct mptcp_addr_info *remote); 655int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 656 struct socket **new_sock); 657void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 658 struct sockaddr_storage *addr, 659 unsigned short family); 660struct mptcp_sched_ops *mptcp_sched_find(const char *name); 661int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 662void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 663void mptcp_sched_init(void); 664int mptcp_init_sched(struct mptcp_sock *msk, 665 struct mptcp_sched_ops *sched); 666void mptcp_release_sched(struct mptcp_sock *msk); 667void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 668 bool scheduled); 669struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 670struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 671int mptcp_sched_get_send(struct mptcp_sock *msk); 672int mptcp_sched_get_retrans(struct mptcp_sock *msk); 673 674static inline bool __tcp_can_send(const struct sock *ssk) 675{ 676 /* only send if our side has not closed yet */ 677 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 678} 679 680static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 681{ 682 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 683 if (subflow->request_join && !subflow->fully_established) 684 return false; 685 686 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 687} 688 689void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 690 691bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 692 693void mptcp_subflow_drop_ctx(struct sock *ssk); 694 695static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 696 struct mptcp_subflow_context *ctx) 697{ 698 sk->sk_data_ready = sock_def_readable; 699 sk->sk_state_change = ctx->tcp_state_change; 700 sk->sk_write_space = sk_stream_write_space; 701 sk->sk_error_report = ctx->tcp_error_report; 702 703 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 704} 705 706void __init mptcp_proto_init(void); 707#if IS_ENABLED(CONFIG_MPTCP_IPV6) 708int __init mptcp_proto_v6_init(void); 709#endif 710 711struct sock *mptcp_sk_clone_init(const struct sock *sk, 712 const struct mptcp_options_received *mp_opt, 713 struct sock *ssk, 714 struct request_sock *req); 715void mptcp_get_options(const struct sk_buff *skb, 716 struct mptcp_options_received *mp_opt); 717 718void mptcp_finish_connect(struct sock *sk); 719void __mptcp_sync_state(struct sock *sk, int state); 720void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 721 722static inline void mptcp_stop_tout_timer(struct sock *sk) 723{ 724 if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 725 return; 726 727 sk_stop_timer(sk, &sk->sk_timer); 728 inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 729} 730 731static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 732{ 733 /* avoid 0 timestamp, as that means no close timeout */ 734 inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 735} 736 737static inline void mptcp_start_tout_timer(struct sock *sk) 738{ 739 mptcp_set_close_tout(sk, tcp_jiffies32); 740 mptcp_reset_tout_timer(mptcp_sk(sk), 0); 741} 742 743static inline bool mptcp_is_fully_established(struct sock *sk) 744{ 745 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 746 READ_ONCE(mptcp_sk(sk)->fully_established); 747} 748void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 749void mptcp_data_ready(struct sock *sk, struct sock *ssk); 750bool mptcp_finish_join(struct sock *sk); 751bool mptcp_schedule_work(struct sock *sk); 752int mptcp_setsockopt(struct sock *sk, int level, int optname, 753 sockptr_t optval, unsigned int optlen); 754int mptcp_getsockopt(struct sock *sk, int level, int optname, 755 char __user *optval, int __user *option); 756 757u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 758static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 759{ 760 if (use_64bit) 761 return cur_seq; 762 763 return __mptcp_expand_seq(old_seq, cur_seq); 764} 765void __mptcp_check_push(struct sock *sk, struct sock *ssk); 766void __mptcp_data_acked(struct sock *sk); 767void __mptcp_error_report(struct sock *sk); 768bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 769static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 770{ 771 return READ_ONCE(msk->snd_data_fin_enable) && 772 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 773} 774 775static inline void mptcp_write_space(struct sock *sk) 776{ 777 if (sk_stream_is_writeable(sk)) { 778 /* pairs with memory barrier in mptcp_poll */ 779 smp_mb(); 780 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 781 sk_stream_write_space(sk); 782 } 783} 784 785static inline void __mptcp_sync_sndbuf(struct sock *sk) 786{ 787 struct mptcp_subflow_context *subflow; 788 int ssk_sndbuf, new_sndbuf; 789 790 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 791 return; 792 793 new_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[0]; 794 mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 795 ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf); 796 797 subflow->cached_sndbuf = ssk_sndbuf; 798 new_sndbuf += ssk_sndbuf; 799 } 800 801 /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */ 802 WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); 803 mptcp_write_space(sk); 804} 805 806/* The called held both the msk socket and the subflow socket locks, 807 * possibly under BH 808 */ 809static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 810{ 811 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 812 813 if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) 814 __mptcp_sync_sndbuf(sk); 815} 816 817/* the caller held only the subflow socket lock, either in process or 818 * BH context. Additionally this can be called under the msk data lock, 819 * so we can't acquire such lock here: let the delegate action acquires 820 * the needed locks in suitable order. 821 */ 822static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 823{ 824 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 825 826 if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) 827 return; 828 829 local_bh_disable(); 830 mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); 831 local_bh_enable(); 832} 833 834void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 835 836#define MPTCP_TOKEN_MAX_RETRIES 4 837 838void __init mptcp_token_init(void); 839static inline void mptcp_token_init_request(struct request_sock *req) 840{ 841 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 842} 843 844int mptcp_token_new_request(struct request_sock *req); 845void mptcp_token_destroy_request(struct request_sock *req); 846int mptcp_token_new_connect(struct sock *ssk); 847void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 848 struct mptcp_sock *msk); 849bool mptcp_token_exists(u32 token); 850struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 851struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 852 long *s_num); 853void mptcp_token_destroy(struct mptcp_sock *msk); 854 855void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 856 857void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 858__sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 859 860void __init mptcp_pm_init(void); 861void mptcp_pm_data_init(struct mptcp_sock *msk); 862void mptcp_pm_data_reset(struct mptcp_sock *msk); 863int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 864 struct mptcp_addr_info *addr); 865int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 866 bool require_family, 867 struct mptcp_pm_addr_entry *entry); 868bool mptcp_pm_addr_families_match(const struct sock *sk, 869 const struct mptcp_addr_info *loc, 870 const struct mptcp_addr_info *rem); 871void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 872void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 873void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 874void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 875bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 876void mptcp_pm_connection_closed(struct mptcp_sock *msk); 877void mptcp_pm_subflow_established(struct mptcp_sock *msk); 878bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 879void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk, 880 const struct mptcp_subflow_context *subflow); 881void mptcp_pm_add_addr_received(const struct sock *ssk, 882 const struct mptcp_addr_info *addr); 883void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 884 const struct mptcp_addr_info *addr); 885void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 886void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 887void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 888 const struct mptcp_rm_list *rm_list); 889void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 890void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 891int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 892 struct mptcp_addr_info *addr, 893 struct mptcp_addr_info *rem, 894 u8 bkup); 895bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 896 const struct mptcp_addr_info *addr); 897void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 898bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 899struct mptcp_pm_add_entry * 900mptcp_pm_del_add_timer(struct mptcp_sock *msk, 901 const struct mptcp_addr_info *addr, bool check_id); 902struct mptcp_pm_add_entry * 903mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 904 const struct mptcp_addr_info *addr); 905int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 906 unsigned int id, 907 u8 *flags, int *ifindex); 908int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, 909 u8 *flags, int *ifindex); 910int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 911 unsigned int id, 912 u8 *flags, int *ifindex); 913int mptcp_pm_set_flags(struct net *net, struct nlattr *token, 914 struct mptcp_pm_addr_entry *loc, 915 struct mptcp_pm_addr_entry *rem, u8 bkup); 916int mptcp_pm_nl_set_flags(struct net *net, struct mptcp_pm_addr_entry *addr, u8 bkup); 917int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token, 918 struct mptcp_pm_addr_entry *loc, 919 struct mptcp_pm_addr_entry *rem, u8 bkup); 920int mptcp_pm_announce_addr(struct mptcp_sock *msk, 921 const struct mptcp_addr_info *addr, 922 bool echo); 923int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 924int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 925void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); 926void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 927 struct list_head *rm_list); 928 929void mptcp_free_local_addr_list(struct mptcp_sock *msk); 930int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info); 931int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info); 932int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info); 933int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info); 934 935void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 936 const struct sock *ssk, gfp_t gfp); 937void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 938void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 939void mptcp_event_pm_listener(const struct sock *ssk, 940 enum mptcp_event_type event); 941bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 942 943void __mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 944 const struct mptcp_options_received *mp_opt); 945void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 946 struct request_sock *req); 947 948static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 949{ 950 return READ_ONCE(msk->pm.addr_signal) & 951 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 952} 953 954static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 955{ 956 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 957} 958 959static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 960{ 961 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 962} 963 964static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 965{ 966 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 967} 968 969static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 970{ 971 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 972} 973 974static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 975{ 976 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 977} 978 979static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 980{ 981 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 982 983 if (family == AF_INET6) 984 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 985 if (!echo) 986 len += MPTCPOPT_THMAC_LEN; 987 /* account for 2 trailing 'nop' options */ 988 if (port) 989 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 990 991 return len; 992} 993 994static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 995{ 996 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 997 return -EINVAL; 998 999 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 1000} 1001 1002bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 1003 unsigned int opt_size, unsigned int remaining, 1004 struct mptcp_addr_info *addr, bool *echo, 1005 bool *drop_other_suboptions); 1006bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 1007 struct mptcp_rm_list *rm_list); 1008int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 1009int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1010int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1011 1012static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow) 1013{ 1014 int local_id = READ_ONCE(subflow->local_id); 1015 1016 if (local_id < 0) 1017 return 0; 1018 return local_id; 1019} 1020 1021void __init mptcp_pm_nl_init(void); 1022void mptcp_pm_nl_work(struct mptcp_sock *msk); 1023void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 1024 const struct mptcp_rm_list *rm_list); 1025unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 1026unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 1027unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 1028unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 1029 1030/* called under PM lock */ 1031static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 1032{ 1033 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 1034 WRITE_ONCE(msk->pm.accept_subflow, true); 1035} 1036 1037static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 1038{ 1039 spin_lock_bh(&msk->pm.lock); 1040 __mptcp_pm_close_subflow(msk); 1041 spin_unlock_bh(&msk->pm.lock); 1042} 1043 1044void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 1045void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 1046 1047static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 1048{ 1049 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 1050} 1051 1052void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 1053 1054static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 1055{ 1056 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1057} 1058 1059static inline bool mptcp_check_fallback(const struct sock *sk) 1060{ 1061 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1062 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1063 1064 return __mptcp_check_fallback(msk); 1065} 1066 1067static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1068{ 1069 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 1070 pr_debug("TCP fallback already done (msk=%p)", msk); 1071 return; 1072 } 1073 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1074} 1075 1076static inline void mptcp_do_fallback(struct sock *ssk) 1077{ 1078 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1079 struct sock *sk = subflow->conn; 1080 struct mptcp_sock *msk; 1081 1082 msk = mptcp_sk(sk); 1083 __mptcp_do_fallback(msk); 1084 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1085 gfp_t saved_allocation = ssk->sk_allocation; 1086 1087 /* we are in a atomic (BH) scope, override ssk default for data 1088 * fin allocation 1089 */ 1090 ssk->sk_allocation = GFP_ATOMIC; 1091 ssk->sk_shutdown |= SEND_SHUTDOWN; 1092 tcp_shutdown(ssk, SEND_SHUTDOWN); 1093 ssk->sk_allocation = saved_allocation; 1094 } 1095} 1096 1097#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 1098 1099static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 1100{ 1101 struct mptcp_ext *mpext; 1102 1103 mpext = skb ? mptcp_get_ext(skb) : NULL; 1104 if (mpext && mpext->infinite_map) 1105 return true; 1106 1107 return false; 1108} 1109 1110static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 1111{ 1112 return (subflow->request_mptcp || subflow->request_join); 1113} 1114 1115static inline bool subflow_simultaneous_connect(struct sock *sk) 1116{ 1117 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1118 1119 return (1 << sk->sk_state) & 1120 (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING) && 1121 is_active_ssk(subflow) && 1122 !subflow->conn_finished; 1123} 1124 1125#ifdef CONFIG_SYN_COOKIES 1126void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1127 struct sk_buff *skb); 1128bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1129 struct sk_buff *skb); 1130void __init mptcp_join_cookie_init(void); 1131#else 1132static inline void 1133subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1134 struct sk_buff *skb) {} 1135static inline bool 1136mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1137 struct sk_buff *skb) 1138{ 1139 return false; 1140} 1141 1142static inline void mptcp_join_cookie_init(void) {} 1143#endif 1144 1145#endif /* __MPTCP_PROTOCOL_H */ 1146