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 #include "mptcp_pm_gen.h" 17 18 #define MPTCP_SUPPORTED_VERSION 1 19 20 /* MPTCP option bits */ 21 #define OPTION_MPTCP_MPC_SYN BIT(0) 22 #define OPTION_MPTCP_MPC_SYNACK BIT(1) 23 #define OPTION_MPTCP_MPC_ACK BIT(2) 24 #define OPTION_MPTCP_MPJ_SYN BIT(3) 25 #define OPTION_MPTCP_MPJ_SYNACK BIT(4) 26 #define OPTION_MPTCP_MPJ_ACK BIT(5) 27 #define OPTION_MPTCP_ADD_ADDR BIT(6) 28 #define OPTION_MPTCP_RM_ADDR BIT(7) 29 #define OPTION_MPTCP_FASTCLOSE BIT(8) 30 #define OPTION_MPTCP_PRIO BIT(9) 31 #define OPTION_MPTCP_RST BIT(10) 32 #define OPTION_MPTCP_DSS BIT(11) 33 #define OPTION_MPTCP_FAIL BIT(12) 34 35 #define OPTION_MPTCP_CSUMREQD BIT(13) 36 37 #define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \ 38 OPTION_MPTCP_MPC_ACK) 39 #define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \ 40 OPTION_MPTCP_MPJ_ACK) 41 42 /* MPTCP option subtypes */ 43 #define MPTCPOPT_MP_CAPABLE 0 44 #define MPTCPOPT_MP_JOIN 1 45 #define MPTCPOPT_DSS 2 46 #define MPTCPOPT_ADD_ADDR 3 47 #define MPTCPOPT_RM_ADDR 4 48 #define MPTCPOPT_MP_PRIO 5 49 #define MPTCPOPT_MP_FAIL 6 50 #define MPTCPOPT_MP_FASTCLOSE 7 51 #define MPTCPOPT_RST 8 52 53 /* MPTCP suboption lengths */ 54 #define TCPOLEN_MPTCP_MPC_SYN 4 55 #define TCPOLEN_MPTCP_MPC_SYNACK 12 56 #define TCPOLEN_MPTCP_MPC_ACK 20 57 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22 58 #define TCPOLEN_MPTCP_MPJ_SYN 12 59 #define TCPOLEN_MPTCP_MPJ_SYNACK 16 60 #define TCPOLEN_MPTCP_MPJ_ACK 24 61 #define TCPOLEN_MPTCP_DSS_BASE 4 62 #define TCPOLEN_MPTCP_DSS_ACK32 4 63 #define TCPOLEN_MPTCP_DSS_ACK64 8 64 #define TCPOLEN_MPTCP_DSS_MAP32 10 65 #define TCPOLEN_MPTCP_DSS_MAP64 14 66 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2 67 #define TCPOLEN_MPTCP_ADD_ADDR 16 68 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 69 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 70 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 71 #define TCPOLEN_MPTCP_ADD_ADDR6 28 72 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 73 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 74 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 75 #define TCPOLEN_MPTCP_PORT_LEN 2 76 #define TCPOLEN_MPTCP_PORT_ALIGN 2 77 #define TCPOLEN_MPTCP_RM_ADDR_BASE 3 78 #define TCPOLEN_MPTCP_PRIO 3 79 #define TCPOLEN_MPTCP_PRIO_ALIGN 4 80 #define TCPOLEN_MPTCP_FASTCLOSE 12 81 #define TCPOLEN_MPTCP_RST 4 82 #define TCPOLEN_MPTCP_FAIL 12 83 84 #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA) 85 86 /* MPTCP MP_JOIN flags */ 87 #define MPTCPOPT_BACKUP BIT(0) 88 #define MPTCPOPT_THMAC_LEN 8 89 90 /* MPTCP MP_CAPABLE flags */ 91 #define MPTCP_VERSION_MASK (0x0F) 92 #define MPTCP_CAP_CHECKSUM_REQD BIT(7) 93 #define MPTCP_CAP_EXTENSIBILITY BIT(6) 94 #define MPTCP_CAP_DENY_JOIN_ID0 BIT(5) 95 #define MPTCP_CAP_HMAC_SHA256 BIT(0) 96 #define MPTCP_CAP_FLAG_MASK (0x1F) 97 98 /* MPTCP DSS flags */ 99 #define MPTCP_DSS_DATA_FIN BIT(4) 100 #define MPTCP_DSS_DSN64 BIT(3) 101 #define MPTCP_DSS_HAS_MAP BIT(2) 102 #define MPTCP_DSS_ACK64 BIT(1) 103 #define MPTCP_DSS_HAS_ACK BIT(0) 104 #define MPTCP_DSS_FLAG_MASK (0x1F) 105 106 /* MPTCP ADD_ADDR flags */ 107 #define MPTCP_ADDR_ECHO BIT(0) 108 109 /* MPTCP MP_PRIO flags */ 110 #define MPTCP_PRIO_BKUP BIT(0) 111 112 /* MPTCP TCPRST flags */ 113 #define MPTCP_RST_TRANSIENT BIT(0) 114 115 /* MPTCP socket atomic flags */ 116 #define MPTCP_NOSPACE 1 117 #define MPTCP_WORK_RTX 2 118 #define MPTCP_FALLBACK_DONE 4 119 #define MPTCP_WORK_CLOSE_SUBFLOW 5 120 121 /* MPTCP socket release cb flags */ 122 #define MPTCP_PUSH_PENDING 1 123 #define MPTCP_CLEAN_UNA 2 124 #define MPTCP_ERROR_REPORT 3 125 #define MPTCP_RETRANSMIT 4 126 #define MPTCP_FLUSH_JOIN_LIST 5 127 #define MPTCP_CONNECTED 6 128 #define MPTCP_SYNC_SNDBUF 7 129 130 struct mptcp_skb_cb { 131 u64 map_seq; 132 u64 end_seq; 133 u32 offset; 134 u8 has_rxtstamp:1; 135 }; 136 137 #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) 138 139 static inline bool before64(__u64 seq1, __u64 seq2) 140 { 141 return (__s64)(seq1 - seq2) < 0; 142 } 143 144 #define after64(seq2, seq1) before64(seq1, seq2) 145 146 struct mptcp_options_received { 147 u64 sndr_key; 148 u64 rcvr_key; 149 u64 data_ack; 150 u64 data_seq; 151 u32 subflow_seq; 152 u16 data_len; 153 __sum16 csum; 154 u16 suboptions; 155 u32 token; 156 u32 nonce; 157 u16 use_map:1, 158 dsn64:1, 159 data_fin:1, 160 use_ack:1, 161 ack64:1, 162 mpc_map:1, 163 reset_reason:4, 164 reset_transient:1, 165 echo:1, 166 backup:1, 167 deny_join_id0:1, 168 __unused:2; 169 u8 join_id; 170 u64 thmac; 171 u8 hmac[MPTCPOPT_HMAC_LEN]; 172 struct mptcp_addr_info addr; 173 struct mptcp_rm_list rm_list; 174 u64 ahmac; 175 u64 fail_seq; 176 }; 177 178 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 179 { 180 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 181 ((nib & 0xF) << 8) | field); 182 } 183 184 enum mptcp_pm_status { 185 MPTCP_PM_ADD_ADDR_RECEIVED, 186 MPTCP_PM_ADD_ADDR_SEND_ACK, 187 MPTCP_PM_RM_ADDR_RECEIVED, 188 MPTCP_PM_ESTABLISHED, 189 MPTCP_PM_SUBFLOW_ESTABLISHED, 190 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 191 MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is 192 * accounted int id_avail_bitmap 193 */ 194 }; 195 196 enum mptcp_pm_type { 197 MPTCP_PM_TYPE_KERNEL = 0, 198 MPTCP_PM_TYPE_USERSPACE, 199 200 __MPTCP_PM_TYPE_NR, 201 __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1, 202 }; 203 204 /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */ 205 #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1) 206 207 enum mptcp_addr_signal_status { 208 MPTCP_ADD_ADDR_SIGNAL, 209 MPTCP_ADD_ADDR_ECHO, 210 MPTCP_RM_ADDR_SIGNAL, 211 }; 212 213 /* max value of mptcp_addr_info.id */ 214 #define MPTCP_PM_MAX_ADDR_ID U8_MAX 215 216 struct mptcp_pm_data { 217 struct mptcp_addr_info local; 218 struct mptcp_addr_info remote; 219 struct list_head anno_list; 220 struct list_head userspace_pm_local_addr_list; 221 222 spinlock_t lock; /*protects the whole PM data */ 223 224 u8 addr_signal; 225 bool server_side; 226 bool work_pending; 227 bool accept_addr; 228 bool accept_subflow; 229 bool remote_deny_join_id0; 230 u8 add_addr_signaled; 231 u8 add_addr_accepted; 232 u8 local_addr_used; 233 u8 pm_type; 234 u8 subflows; 235 u8 status; 236 DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 237 struct mptcp_rm_list rm_list_tx; 238 struct mptcp_rm_list rm_list_rx; 239 }; 240 241 struct mptcp_pm_addr_entry { 242 struct list_head list; 243 struct mptcp_addr_info addr; 244 u8 flags; 245 int ifindex; 246 struct socket *lsk; 247 }; 248 249 struct mptcp_data_frag { 250 struct list_head list; 251 u64 data_seq; 252 u16 data_len; 253 u16 offset; 254 u16 overhead; 255 u16 already_sent; 256 struct page *page; 257 }; 258 259 /* MPTCP connection sock */ 260 struct mptcp_sock { 261 /* inet_connection_sock must be the first member */ 262 struct inet_connection_sock sk; 263 u64 local_key; 264 u64 remote_key; 265 u64 write_seq; 266 u64 bytes_sent; 267 u64 snd_nxt; 268 u64 bytes_received; 269 u64 ack_seq; 270 atomic64_t rcv_wnd_sent; 271 u64 rcv_data_fin_seq; 272 u64 bytes_retrans; 273 u64 bytes_consumed; 274 int rmem_fwd_alloc; 275 int snd_burst; 276 int old_wspace; 277 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 278 * recovery related fields are under data_lock 279 * protection 280 */ 281 u64 bytes_acked; 282 u64 snd_una; 283 u64 wnd_end; 284 unsigned long timer_ival; 285 u32 token; 286 int rmem_released; 287 unsigned long flags; 288 unsigned long cb_flags; 289 unsigned long push_pending; 290 bool recovery; /* closing subflow write queue reinjected */ 291 bool can_ack; 292 bool fully_established; 293 bool rcv_data_fin; 294 bool snd_data_fin_enable; 295 bool rcv_fastclose; 296 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 297 bool csum_enabled; 298 bool allow_infinite_fallback; 299 u8 mpc_endpoint_id; 300 u8 recvmsg_inq:1, 301 cork:1, 302 nodelay:1, 303 fastopening:1, 304 in_accept_queue:1, 305 free_first: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) 340 341 static 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 */ 351 static 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 } 355 356 static 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 } 360 361 static 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 } 365 366 static 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 } 372 373 static 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 } 382 383 static 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 } 395 396 static 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 } 405 406 struct csum_pseudo_header { 407 __be64 data_seq; 408 __be32 subflow_seq; 409 __be16 data_len; 410 __sum16 csum; 411 }; 412 413 struct 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 }; 432 433 static inline struct mptcp_subflow_request_sock * 434 mptcp_subflow_rsk(const struct request_sock *rsk) 435 { 436 return (struct mptcp_subflow_request_sock *)rsk; 437 } 438 439 struct mptcp_delegated_action { 440 struct napi_struct napi; 441 struct list_head head; 442 }; 443 444 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 445 446 #define MPTCP_DELEGATE_SCHEDULED 0 447 #define MPTCP_DELEGATE_SEND 1 448 #define MPTCP_DELEGATE_ACK 2 449 #define MPTCP_DELEGATE_SNDBUF 3 450 451 #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 452 /* MPTCP subflow context */ 453 struct mptcp_subflow_context { 454 struct list_head node;/* conn_list of subflows */ 455 456 struct_group(reset, 457 458 unsigned long avg_pacing_rate; /* protected by msk socket lock */ 459 u64 local_key; 460 u64 remote_key; 461 u64 idsn; 462 u64 map_seq; 463 u32 snd_isn; 464 u32 token; 465 u32 rel_write_seq; 466 u32 map_subflow_seq; 467 u32 ssn_offset; 468 u32 map_data_len; 469 __wsum map_data_csum; 470 u32 map_csum_len; 471 u32 request_mptcp : 1, /* send MP_CAPABLE */ 472 request_join : 1, /* send MP_JOIN */ 473 request_bkup : 1, 474 mp_capable : 1, /* remote is MPTCP capable */ 475 mp_join : 1, /* remote is JOINing */ 476 fully_established : 1, /* path validated */ 477 pm_notified : 1, /* PM hook called for established status */ 478 conn_finished : 1, 479 map_valid : 1, 480 map_csum_reqd : 1, 481 map_data_fin : 1, 482 mpc_map : 1, 483 backup : 1, 484 send_mp_prio : 1, 485 send_mp_fail : 1, 486 send_fastclose : 1, 487 send_infinite_map : 1, 488 remote_key_valid : 1, /* received the peer key from */ 489 disposable : 1, /* ctx can be free at ulp release time */ 490 stale : 1, /* unable to snd/rcv data, do not use for xmit */ 491 local_id_valid : 1, /* local_id is correctly initialized */ 492 valid_csum_seen : 1, /* at least one csum validated */ 493 is_mptfo : 1, /* subflow is doing TFO */ 494 __unused : 9; 495 bool data_avail; 496 bool scheduled; 497 u32 remote_nonce; 498 u64 thmac; 499 u32 local_nonce; 500 u32 remote_token; 501 union { 502 u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 503 u64 iasn; /* initial ack sequence number, MPC subflows only */ 504 }; 505 u8 local_id; 506 u8 remote_id; 507 u8 reset_seen:1; 508 u8 reset_transient:1; 509 u8 reset_reason:4; 510 u8 stale_count; 511 512 u32 subflow_id; 513 514 long delegated_status; 515 unsigned long fail_tout; 516 517 ); 518 519 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 520 521 u32 setsockopt_seq; 522 u32 stale_rcv_tstamp; 523 int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, 524 * protected by the msk socket lock 525 */ 526 527 struct sock *tcp_sock; /* tcp sk backpointer */ 528 struct sock *conn; /* parent mptcp_sock */ 529 const struct inet_connection_sock_af_ops *icsk_af_ops; 530 void (*tcp_state_change)(struct sock *sk); 531 void (*tcp_error_report)(struct sock *sk); 532 533 struct rcu_head rcu; 534 }; 535 536 static inline struct mptcp_subflow_context * 537 mptcp_subflow_ctx(const struct sock *sk) 538 { 539 struct inet_connection_sock *icsk = inet_csk(sk); 540 541 /* Use RCU on icsk_ulp_data only for sock diag code */ 542 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 543 } 544 545 static inline struct sock * 546 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 547 { 548 return subflow->tcp_sock; 549 } 550 551 static inline void 552 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 553 { 554 memset(&subflow->reset, 0, sizeof(subflow->reset)); 555 subflow->request_mptcp = 1; 556 } 557 558 static inline u64 559 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 560 { 561 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 562 subflow->ssn_offset - 563 subflow->map_subflow_seq; 564 } 565 566 static inline u64 567 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 568 { 569 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 570 } 571 572 void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 573 574 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 575 { 576 long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 577 struct mptcp_delegated_action *delegated; 578 bool schedule; 579 580 /* the caller held the subflow bh socket lock */ 581 lockdep_assert_in_softirq(); 582 583 /* The implied barrier pairs with tcp_release_cb_override() 584 * mptcp_napi_poll(), and ensures the below list check sees list 585 * updates done prior to delegated status bits changes 586 */ 587 old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 588 if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 589 if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 590 return; 591 592 delegated = this_cpu_ptr(&mptcp_delegated_actions); 593 schedule = list_empty(&delegated->head); 594 list_add_tail(&subflow->delegated_node, &delegated->head); 595 sock_hold(mptcp_subflow_tcp_sock(subflow)); 596 if (schedule) 597 napi_schedule(&delegated->napi); 598 } 599 } 600 601 static inline struct mptcp_subflow_context * 602 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 603 { 604 struct mptcp_subflow_context *ret; 605 606 if (list_empty(&delegated->head)) 607 return NULL; 608 609 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 610 list_del_init(&ret->delegated_node); 611 return ret; 612 } 613 614 int mptcp_is_enabled(const struct net *net); 615 unsigned int mptcp_get_add_addr_timeout(const struct net *net); 616 int mptcp_is_checksum_enabled(const struct net *net); 617 int mptcp_allow_join_id0(const struct net *net); 618 unsigned int mptcp_stale_loss_cnt(const struct net *net); 619 unsigned int mptcp_close_timeout(const struct sock *sk); 620 int mptcp_get_pm_type(const struct net *net); 621 const char *mptcp_get_scheduler(const struct net *net); 622 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 623 const struct mptcp_options_received *mp_opt); 624 bool __mptcp_retransmit_pending_data(struct sock *sk); 625 void mptcp_check_and_set_pending(struct sock *sk); 626 void __mptcp_push_pending(struct sock *sk, unsigned int flags); 627 bool mptcp_subflow_data_available(struct sock *sk); 628 void __init mptcp_subflow_init(void); 629 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 630 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 631 struct mptcp_subflow_context *subflow); 632 void __mptcp_subflow_send_ack(struct sock *ssk); 633 void mptcp_subflow_reset(struct sock *ssk); 634 void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 635 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 636 struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 637 bool __mptcp_close(struct sock *sk, long timeout); 638 void mptcp_cancel_work(struct sock *sk); 639 void __mptcp_unaccepted_force_close(struct sock *sk); 640 void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 641 642 bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 643 const struct mptcp_addr_info *b, bool use_port); 644 void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 645 646 /* called with sk socket lock held */ 647 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 648 const struct mptcp_addr_info *remote); 649 int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 650 struct socket **new_sock); 651 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 652 struct sockaddr_storage *addr, 653 unsigned short family); 654 struct mptcp_sched_ops *mptcp_sched_find(const char *name); 655 int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 656 void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 657 void mptcp_sched_init(void); 658 int mptcp_init_sched(struct mptcp_sock *msk, 659 struct mptcp_sched_ops *sched); 660 void mptcp_release_sched(struct mptcp_sock *msk); 661 void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 662 bool scheduled); 663 struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 664 struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 665 int mptcp_sched_get_send(struct mptcp_sock *msk); 666 int mptcp_sched_get_retrans(struct mptcp_sock *msk); 667 668 static inline u64 mptcp_data_avail(const struct mptcp_sock *msk) 669 { 670 return READ_ONCE(msk->bytes_received) - READ_ONCE(msk->bytes_consumed); 671 } 672 673 static inline bool mptcp_epollin_ready(const struct sock *sk) 674 { 675 /* mptcp doesn't have to deal with small skbs in the receive queue, 676 * at it can always coalesce them 677 */ 678 return (mptcp_data_avail(mptcp_sk(sk)) >= sk->sk_rcvlowat) || 679 (mem_cgroup_sockets_enabled && sk->sk_memcg && 680 mem_cgroup_under_socket_pressure(sk->sk_memcg)) || 681 READ_ONCE(tcp_memory_pressure); 682 } 683 684 int mptcp_set_rcvlowat(struct sock *sk, int val); 685 686 static inline bool __tcp_can_send(const struct sock *ssk) 687 { 688 /* only send if our side has not closed yet */ 689 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 690 } 691 692 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 693 { 694 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 695 if (subflow->request_join && !subflow->fully_established) 696 return false; 697 698 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 699 } 700 701 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 702 703 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 704 705 void mptcp_subflow_drop_ctx(struct sock *ssk); 706 707 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 708 struct mptcp_subflow_context *ctx) 709 { 710 sk->sk_data_ready = sock_def_readable; 711 sk->sk_state_change = ctx->tcp_state_change; 712 sk->sk_write_space = sk_stream_write_space; 713 sk->sk_error_report = ctx->tcp_error_report; 714 715 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 716 } 717 718 void __init mptcp_proto_init(void); 719 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 720 int __init mptcp_proto_v6_init(void); 721 #endif 722 723 struct sock *mptcp_sk_clone_init(const struct sock *sk, 724 const struct mptcp_options_received *mp_opt, 725 struct sock *ssk, 726 struct request_sock *req); 727 void mptcp_get_options(const struct sk_buff *skb, 728 struct mptcp_options_received *mp_opt); 729 730 void mptcp_finish_connect(struct sock *sk); 731 void __mptcp_set_connected(struct sock *sk); 732 void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 733 734 static inline void mptcp_stop_tout_timer(struct sock *sk) 735 { 736 if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 737 return; 738 739 sk_stop_timer(sk, &sk->sk_timer); 740 inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 741 } 742 743 static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 744 { 745 /* avoid 0 timestamp, as that means no close timeout */ 746 inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 747 } 748 749 static inline void mptcp_start_tout_timer(struct sock *sk) 750 { 751 mptcp_set_close_tout(sk, tcp_jiffies32); 752 mptcp_reset_tout_timer(mptcp_sk(sk), 0); 753 } 754 755 static inline bool mptcp_is_fully_established(struct sock *sk) 756 { 757 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 758 READ_ONCE(mptcp_sk(sk)->fully_established); 759 } 760 761 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 762 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 763 bool mptcp_finish_join(struct sock *sk); 764 bool mptcp_schedule_work(struct sock *sk); 765 int mptcp_setsockopt(struct sock *sk, int level, int optname, 766 sockptr_t optval, unsigned int optlen); 767 int mptcp_getsockopt(struct sock *sk, int level, int optname, 768 char __user *optval, int __user *option); 769 770 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 771 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 772 { 773 if (use_64bit) 774 return cur_seq; 775 776 return __mptcp_expand_seq(old_seq, cur_seq); 777 } 778 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 779 void __mptcp_data_acked(struct sock *sk); 780 void __mptcp_error_report(struct sock *sk); 781 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 782 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 783 { 784 return READ_ONCE(msk->snd_data_fin_enable) && 785 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 786 } 787 788 static inline void __mptcp_sync_sndbuf(struct sock *sk) 789 { 790 struct mptcp_subflow_context *subflow; 791 int ssk_sndbuf, new_sndbuf; 792 793 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 794 return; 795 796 new_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[0]; 797 mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 798 ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf); 799 800 subflow->cached_sndbuf = ssk_sndbuf; 801 new_sndbuf += ssk_sndbuf; 802 } 803 804 /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */ 805 WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); 806 } 807 808 /* The called held both the msk socket and the subflow socket locks, 809 * possibly under BH 810 */ 811 static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 812 { 813 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 814 815 if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) 816 __mptcp_sync_sndbuf(sk); 817 } 818 819 /* the caller held only the subflow socket lock, either in process or 820 * BH context. Additionally this can be called under the msk data lock, 821 * so we can't acquire such lock here: let the delegate action acquires 822 * the needed locks in suitable order. 823 */ 824 static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 825 { 826 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 827 828 if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) 829 return; 830 831 local_bh_disable(); 832 mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); 833 local_bh_enable(); 834 } 835 836 static inline void mptcp_write_space(struct sock *sk) 837 { 838 if (sk_stream_is_writeable(sk)) { 839 /* pairs with memory barrier in mptcp_poll */ 840 smp_mb(); 841 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 842 sk_stream_write_space(sk); 843 } 844 } 845 846 void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 847 848 #define MPTCP_TOKEN_MAX_RETRIES 4 849 850 void __init mptcp_token_init(void); 851 static inline void mptcp_token_init_request(struct request_sock *req) 852 { 853 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 854 } 855 856 int mptcp_token_new_request(struct request_sock *req); 857 void mptcp_token_destroy_request(struct request_sock *req); 858 int mptcp_token_new_connect(struct sock *ssk); 859 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 860 struct mptcp_sock *msk); 861 bool mptcp_token_exists(u32 token); 862 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 863 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 864 long *s_num); 865 void mptcp_token_destroy(struct mptcp_sock *msk); 866 867 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 868 869 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 870 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 871 872 void __init mptcp_pm_init(void); 873 void mptcp_pm_data_init(struct mptcp_sock *msk); 874 void mptcp_pm_data_reset(struct mptcp_sock *msk); 875 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 876 struct mptcp_addr_info *addr); 877 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 878 bool require_family, 879 struct mptcp_pm_addr_entry *entry); 880 bool mptcp_pm_addr_families_match(const struct sock *sk, 881 const struct mptcp_addr_info *loc, 882 const struct mptcp_addr_info *rem); 883 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 884 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 885 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 886 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 887 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 888 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 889 void mptcp_pm_subflow_established(struct mptcp_sock *msk); 890 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 891 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, 892 const struct mptcp_subflow_context *subflow); 893 void mptcp_pm_add_addr_received(const struct sock *ssk, 894 const struct mptcp_addr_info *addr); 895 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 896 const struct mptcp_addr_info *addr); 897 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 898 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 899 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 900 const struct mptcp_rm_list *rm_list); 901 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 902 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 903 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 904 struct mptcp_addr_info *addr, 905 struct mptcp_addr_info *rem, 906 u8 bkup); 907 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 908 const struct mptcp_addr_info *addr); 909 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 910 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 911 struct mptcp_pm_add_entry * 912 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 913 const struct mptcp_addr_info *addr, bool check_id); 914 struct mptcp_pm_add_entry * 915 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 916 const struct mptcp_addr_info *addr); 917 int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 918 unsigned int id, 919 u8 *flags, int *ifindex); 920 int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, 921 u8 *flags, int *ifindex); 922 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 923 unsigned int id, 924 u8 *flags, int *ifindex); 925 int mptcp_pm_set_flags(struct net *net, struct nlattr *token, 926 struct mptcp_pm_addr_entry *loc, 927 struct mptcp_pm_addr_entry *rem, u8 bkup); 928 int mptcp_pm_nl_set_flags(struct net *net, struct mptcp_pm_addr_entry *addr, u8 bkup); 929 int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token, 930 struct mptcp_pm_addr_entry *loc, 931 struct mptcp_pm_addr_entry *rem, u8 bkup); 932 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 933 const struct mptcp_addr_info *addr, 934 bool echo); 935 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 936 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 937 void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); 938 void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 939 struct list_head *rm_list); 940 941 void mptcp_free_local_addr_list(struct mptcp_sock *msk); 942 943 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 944 const struct sock *ssk, gfp_t gfp); 945 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 946 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 947 void mptcp_event_pm_listener(const struct sock *ssk, 948 enum mptcp_event_type event); 949 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 950 951 void mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 952 const struct mptcp_options_received *mp_opt); 953 void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 954 struct request_sock *req); 955 956 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 957 { 958 return READ_ONCE(msk->pm.addr_signal) & 959 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 960 } 961 962 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 963 { 964 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 965 } 966 967 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 968 { 969 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 970 } 971 972 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 973 { 974 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 975 } 976 977 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 978 { 979 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 980 } 981 982 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 983 { 984 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 985 } 986 987 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 988 { 989 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 990 991 if (family == AF_INET6) 992 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 993 if (!echo) 994 len += MPTCPOPT_THMAC_LEN; 995 /* account for 2 trailing 'nop' options */ 996 if (port) 997 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 998 999 return len; 1000 } 1001 1002 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 1003 { 1004 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 1005 return -EINVAL; 1006 1007 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 1008 } 1009 1010 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 1011 unsigned int opt_size, unsigned int remaining, 1012 struct mptcp_addr_info *addr, bool *echo, 1013 bool *drop_other_suboptions); 1014 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 1015 struct mptcp_rm_list *rm_list); 1016 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 1017 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1018 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1019 1020 void __init mptcp_pm_nl_init(void); 1021 void mptcp_pm_nl_work(struct mptcp_sock *msk); 1022 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 1023 const struct mptcp_rm_list *rm_list); 1024 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 1025 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 1026 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 1027 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 1028 1029 /* called under PM lock */ 1030 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 1031 { 1032 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 1033 WRITE_ONCE(msk->pm.accept_subflow, true); 1034 } 1035 1036 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 1037 { 1038 spin_lock_bh(&msk->pm.lock); 1039 __mptcp_pm_close_subflow(msk); 1040 spin_unlock_bh(&msk->pm.lock); 1041 } 1042 1043 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 1044 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 1045 1046 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 1047 { 1048 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 1049 } 1050 1051 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 1052 1053 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 1054 { 1055 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1056 } 1057 1058 static inline bool mptcp_check_fallback(const struct sock *sk) 1059 { 1060 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1061 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1062 1063 return __mptcp_check_fallback(msk); 1064 } 1065 1066 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1067 { 1068 if (__mptcp_check_fallback(msk)) { 1069 pr_debug("TCP fallback already done (msk=%p)", msk); 1070 return; 1071 } 1072 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1073 } 1074 1075 static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk) 1076 { 1077 struct sock *ssk = READ_ONCE(msk->first); 1078 1079 return ssk && ((1 << inet_sk_state_load(ssk)) & 1080 (TCPF_ESTABLISHED | TCPF_SYN_SENT | 1081 TCPF_SYN_RECV | TCPF_LISTEN)); 1082 } 1083 1084 static inline void mptcp_do_fallback(struct sock *ssk) 1085 { 1086 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1087 struct sock *sk = subflow->conn; 1088 struct mptcp_sock *msk; 1089 1090 msk = mptcp_sk(sk); 1091 __mptcp_do_fallback(msk); 1092 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1093 gfp_t saved_allocation = ssk->sk_allocation; 1094 1095 /* we are in a atomic (BH) scope, override ssk default for data 1096 * fin allocation 1097 */ 1098 ssk->sk_allocation = GFP_ATOMIC; 1099 ssk->sk_shutdown |= SEND_SHUTDOWN; 1100 tcp_shutdown(ssk, SEND_SHUTDOWN); 1101 ssk->sk_allocation = saved_allocation; 1102 } 1103 } 1104 1105 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 1106 1107 static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 1108 { 1109 struct mptcp_ext *mpext; 1110 1111 mpext = skb ? mptcp_get_ext(skb) : NULL; 1112 if (mpext && mpext->infinite_map) 1113 return true; 1114 1115 return false; 1116 } 1117 1118 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 1119 { 1120 return (subflow->request_mptcp || subflow->request_join); 1121 } 1122 1123 static inline bool subflow_simultaneous_connect(struct sock *sk) 1124 { 1125 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1126 1127 return sk->sk_state == TCP_ESTABLISHED && 1128 is_active_ssk(subflow) && 1129 !subflow->conn_finished; 1130 } 1131 1132 #ifdef CONFIG_SYN_COOKIES 1133 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1134 struct sk_buff *skb); 1135 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1136 struct sk_buff *skb); 1137 void __init mptcp_join_cookie_init(void); 1138 #else 1139 static inline void 1140 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1141 struct sk_buff *skb) {} 1142 static inline bool 1143 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1144 struct sk_buff *skb) 1145 { 1146 return false; 1147 } 1148 1149 static inline void mptcp_join_cookie_init(void) {} 1150 #endif 1151 1152 #endif /* __MPTCP_PROTOCOL_H */ 1153