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 7 127 128 struct 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])) 136 137 static inline bool before64(__u64 seq1, __u64 seq2) 138 { 139 return (__s64)(seq1 - seq2) < 0; 140 } 141 142 #define after64(seq2, seq1) before64(seq1, seq2) 143 144 struct 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 }; 175 176 static 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 } 181 182 enum 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 }; 193 194 enum 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) 204 205 enum 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 213 214 struct 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 }; 238 239 struct 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 }; 246 247 struct 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 */ 258 struct 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 int keepalive_cnt; 307 int keepalive_idle; 308 int keepalive_intvl; 309 struct work_struct work; 310 struct sk_buff *ooo_last_skb; 311 struct rb_root out_of_order_queue; 312 struct sk_buff_head receive_queue; 313 struct list_head conn_list; 314 struct list_head rtx_queue; 315 struct mptcp_data_frag *first_pending; 316 struct list_head join_list; 317 struct sock *first; /* The mptcp ops can safely dereference, using suitable 318 * ONCE annotation, the subflow outside the socket 319 * lock as such sock is freed after close(). 320 */ 321 struct mptcp_pm_data pm; 322 struct mptcp_sched_ops *sched; 323 struct { 324 u32 space; /* bytes copied in last measurement window */ 325 u32 copied; /* bytes copied in this measurement window */ 326 u64 time; /* start time of measurement window */ 327 u64 rtt_us; /* last maximum rtt of subflows */ 328 } rcvq_space; 329 u8 scaling_ratio; 330 331 u32 subflow_id; 332 u32 setsockopt_seq; 333 char ca_name[TCP_CA_NAME_MAX]; 334 }; 335 336 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 337 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 338 339 #define mptcp_for_each_subflow(__msk, __subflow) \ 340 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 341 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 342 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 343 344 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 345 { 346 sock_owned_by_me((const struct sock *)msk); 347 } 348 349 #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 350 351 /* the msk socket don't use the backlog, also account for the bulk 352 * free memory 353 */ 354 static inline int __mptcp_rmem(const struct sock *sk) 355 { 356 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 357 } 358 359 static inline int mptcp_win_from_space(const struct sock *sk, int space) 360 { 361 return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); 362 } 363 364 static inline int __mptcp_space(const struct sock *sk) 365 { 366 return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 367 } 368 369 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 370 { 371 const struct mptcp_sock *msk = mptcp_sk(sk); 372 373 return READ_ONCE(msk->first_pending); 374 } 375 376 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 377 { 378 struct mptcp_sock *msk = mptcp_sk(sk); 379 struct mptcp_data_frag *cur; 380 381 cur = msk->first_pending; 382 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 383 list_next_entry(cur, list); 384 } 385 386 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 387 { 388 const struct mptcp_sock *msk = mptcp_sk(sk); 389 390 if (!msk->first_pending) 391 return NULL; 392 393 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 394 return NULL; 395 396 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 397 } 398 399 static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 400 { 401 struct mptcp_sock *msk = mptcp_sk(sk); 402 403 if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 404 return NULL; 405 406 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 407 } 408 409 struct csum_pseudo_header { 410 __be64 data_seq; 411 __be32 subflow_seq; 412 __be16 data_len; 413 __sum16 csum; 414 }; 415 416 struct mptcp_subflow_request_sock { 417 struct tcp_request_sock sk; 418 u16 mp_capable : 1, 419 mp_join : 1, 420 backup : 1, 421 csum_reqd : 1, 422 allow_join_id0 : 1; 423 u8 local_id; 424 u8 remote_id; 425 u64 local_key; 426 u64 idsn; 427 u32 token; 428 u32 ssn_offset; 429 u64 thmac; 430 u32 local_nonce; 431 u32 remote_nonce; 432 struct mptcp_sock *msk; 433 struct hlist_nulls_node token_node; 434 }; 435 436 static inline struct mptcp_subflow_request_sock * 437 mptcp_subflow_rsk(const struct request_sock *rsk) 438 { 439 return (struct mptcp_subflow_request_sock *)rsk; 440 } 441 442 enum mptcp_data_avail { 443 MPTCP_SUBFLOW_NODATA, 444 MPTCP_SUBFLOW_DATA_AVAIL, 445 }; 446 447 struct mptcp_delegated_action { 448 struct napi_struct napi; 449 struct list_head head; 450 }; 451 452 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 453 454 #define MPTCP_DELEGATE_SCHEDULED 0 455 #define MPTCP_DELEGATE_SEND 1 456 #define MPTCP_DELEGATE_ACK 2 457 #define MPTCP_DELEGATE_SNDBUF 3 458 459 #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 460 /* MPTCP subflow context */ 461 struct mptcp_subflow_context { 462 struct list_head node;/* conn_list of subflows */ 463 464 struct_group(reset, 465 466 unsigned long avg_pacing_rate; /* protected by msk socket lock */ 467 u64 local_key; 468 u64 remote_key; 469 u64 idsn; 470 u64 map_seq; 471 u32 snd_isn; 472 u32 token; 473 u32 rel_write_seq; 474 u32 map_subflow_seq; 475 u32 ssn_offset; 476 u32 map_data_len; 477 __wsum map_data_csum; 478 u32 map_csum_len; 479 u32 request_mptcp : 1, /* send MP_CAPABLE */ 480 request_join : 1, /* send MP_JOIN */ 481 request_bkup : 1, 482 mp_capable : 1, /* remote is MPTCP capable */ 483 mp_join : 1, /* remote is JOINing */ 484 fully_established : 1, /* path validated */ 485 pm_notified : 1, /* PM hook called for established status */ 486 conn_finished : 1, 487 map_valid : 1, 488 map_csum_reqd : 1, 489 map_data_fin : 1, 490 mpc_map : 1, 491 backup : 1, 492 send_mp_prio : 1, 493 send_mp_fail : 1, 494 send_fastclose : 1, 495 send_infinite_map : 1, 496 remote_key_valid : 1, /* received the peer key from */ 497 disposable : 1, /* ctx can be free at ulp release time */ 498 stale : 1, /* unable to snd/rcv data, do not use for xmit */ 499 valid_csum_seen : 1, /* at least one csum validated */ 500 is_mptfo : 1, /* subflow is doing TFO */ 501 __unused : 10; 502 enum mptcp_data_avail data_avail; 503 bool scheduled; 504 u32 remote_nonce; 505 u64 thmac; 506 u32 local_nonce; 507 u32 remote_token; 508 union { 509 u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 510 u64 iasn; /* initial ack sequence number, MPC subflows only */ 511 }; 512 s16 local_id; /* if negative not initialized yet */ 513 u8 remote_id; 514 u8 reset_seen:1; 515 u8 reset_transient:1; 516 u8 reset_reason:4; 517 u8 stale_count; 518 519 u32 subflow_id; 520 521 long delegated_status; 522 unsigned long fail_tout; 523 524 ); 525 526 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 527 528 u32 setsockopt_seq; 529 u32 stale_rcv_tstamp; 530 int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, 531 * protected by the msk socket lock 532 */ 533 534 struct sock *tcp_sock; /* tcp sk backpointer */ 535 struct sock *conn; /* parent mptcp_sock */ 536 const struct inet_connection_sock_af_ops *icsk_af_ops; 537 void (*tcp_state_change)(struct sock *sk); 538 void (*tcp_error_report)(struct sock *sk); 539 540 struct rcu_head rcu; 541 }; 542 543 static inline struct mptcp_subflow_context * 544 mptcp_subflow_ctx(const struct sock *sk) 545 { 546 struct inet_connection_sock *icsk = inet_csk(sk); 547 548 /* Use RCU on icsk_ulp_data only for sock diag code */ 549 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 550 } 551 552 static inline struct sock * 553 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 554 { 555 return subflow->tcp_sock; 556 } 557 558 static inline void 559 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 560 { 561 memset(&subflow->reset, 0, sizeof(subflow->reset)); 562 subflow->request_mptcp = 1; 563 WRITE_ONCE(subflow->local_id, -1); 564 } 565 566 static inline u64 567 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 568 { 569 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 570 subflow->ssn_offset - 571 subflow->map_subflow_seq; 572 } 573 574 static inline u64 575 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 576 { 577 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 578 } 579 580 void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 581 582 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 583 { 584 long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 585 struct mptcp_delegated_action *delegated; 586 bool schedule; 587 588 /* the caller held the subflow bh socket lock */ 589 lockdep_assert_in_softirq(); 590 591 /* The implied barrier pairs with tcp_release_cb_override() 592 * mptcp_napi_poll(), and ensures the below list check sees list 593 * updates done prior to delegated status bits changes 594 */ 595 old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 596 if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 597 if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 598 return; 599 600 delegated = this_cpu_ptr(&mptcp_delegated_actions); 601 schedule = list_empty(&delegated->head); 602 list_add_tail(&subflow->delegated_node, &delegated->head); 603 sock_hold(mptcp_subflow_tcp_sock(subflow)); 604 if (schedule) 605 napi_schedule(&delegated->napi); 606 } 607 } 608 609 static inline struct mptcp_subflow_context * 610 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 611 { 612 struct mptcp_subflow_context *ret; 613 614 if (list_empty(&delegated->head)) 615 return NULL; 616 617 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 618 list_del_init(&ret->delegated_node); 619 return ret; 620 } 621 622 int mptcp_is_enabled(const struct net *net); 623 unsigned int mptcp_get_add_addr_timeout(const struct net *net); 624 int mptcp_is_checksum_enabled(const struct net *net); 625 int mptcp_allow_join_id0(const struct net *net); 626 unsigned int mptcp_stale_loss_cnt(const struct net *net); 627 int mptcp_get_pm_type(const struct net *net); 628 const char *mptcp_get_scheduler(const struct net *net); 629 void __mptcp_subflow_fully_established(struct mptcp_sock *msk, 630 struct mptcp_subflow_context *subflow, 631 const struct mptcp_options_received *mp_opt); 632 bool __mptcp_retransmit_pending_data(struct sock *sk); 633 void mptcp_check_and_set_pending(struct sock *sk); 634 void __mptcp_push_pending(struct sock *sk, unsigned int flags); 635 bool mptcp_subflow_data_available(struct sock *sk); 636 void __init mptcp_subflow_init(void); 637 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 638 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 639 struct mptcp_subflow_context *subflow); 640 void __mptcp_subflow_send_ack(struct sock *ssk); 641 void mptcp_subflow_reset(struct sock *ssk); 642 void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 643 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 644 struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 645 bool __mptcp_close(struct sock *sk, long timeout); 646 void mptcp_cancel_work(struct sock *sk); 647 void __mptcp_unaccepted_force_close(struct sock *sk); 648 void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 649 void mptcp_set_state(struct sock *sk, int state); 650 651 bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 652 const struct mptcp_addr_info *b, bool use_port); 653 void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 654 655 /* called with sk socket lock held */ 656 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 657 const struct mptcp_addr_info *remote); 658 int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 659 struct socket **new_sock); 660 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 661 struct sockaddr_storage *addr, 662 unsigned short family); 663 struct mptcp_sched_ops *mptcp_sched_find(const char *name); 664 int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 665 void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 666 void mptcp_sched_init(void); 667 int mptcp_init_sched(struct mptcp_sock *msk, 668 struct mptcp_sched_ops *sched); 669 void mptcp_release_sched(struct mptcp_sock *msk); 670 void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 671 bool scheduled); 672 struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 673 struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 674 int mptcp_sched_get_send(struct mptcp_sock *msk); 675 int mptcp_sched_get_retrans(struct mptcp_sock *msk); 676 677 static inline bool __tcp_can_send(const struct sock *ssk) 678 { 679 /* only send if our side has not closed yet */ 680 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 681 } 682 683 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 684 { 685 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 686 if (subflow->request_join && !subflow->fully_established) 687 return false; 688 689 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 690 } 691 692 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 693 694 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 695 696 void mptcp_subflow_drop_ctx(struct sock *ssk); 697 698 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 699 struct mptcp_subflow_context *ctx) 700 { 701 sk->sk_data_ready = sock_def_readable; 702 sk->sk_state_change = ctx->tcp_state_change; 703 sk->sk_write_space = sk_stream_write_space; 704 sk->sk_error_report = ctx->tcp_error_report; 705 706 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 707 } 708 709 void __init mptcp_proto_init(void); 710 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 711 int __init mptcp_proto_v6_init(void); 712 #endif 713 714 struct sock *mptcp_sk_clone_init(const struct sock *sk, 715 const struct mptcp_options_received *mp_opt, 716 struct sock *ssk, 717 struct request_sock *req); 718 void mptcp_get_options(const struct sk_buff *skb, 719 struct mptcp_options_received *mp_opt); 720 721 void mptcp_finish_connect(struct sock *sk); 722 void __mptcp_sync_state(struct sock *sk, int state); 723 void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 724 725 static inline void mptcp_stop_tout_timer(struct sock *sk) 726 { 727 if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 728 return; 729 730 sk_stop_timer(sk, &sk->sk_timer); 731 inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 732 } 733 734 static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 735 { 736 /* avoid 0 timestamp, as that means no close timeout */ 737 inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 738 } 739 740 static inline void mptcp_start_tout_timer(struct sock *sk) 741 { 742 mptcp_set_close_tout(sk, tcp_jiffies32); 743 mptcp_reset_tout_timer(mptcp_sk(sk), 0); 744 } 745 746 static inline bool mptcp_is_fully_established(struct sock *sk) 747 { 748 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 749 READ_ONCE(mptcp_sk(sk)->fully_established); 750 } 751 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 752 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 753 bool mptcp_finish_join(struct sock *sk); 754 bool mptcp_schedule_work(struct sock *sk); 755 int mptcp_setsockopt(struct sock *sk, int level, int optname, 756 sockptr_t optval, unsigned int optlen); 757 int mptcp_getsockopt(struct sock *sk, int level, int optname, 758 char __user *optval, int __user *option); 759 760 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 761 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 762 { 763 if (use_64bit) 764 return cur_seq; 765 766 return __mptcp_expand_seq(old_seq, cur_seq); 767 } 768 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 769 void __mptcp_data_acked(struct sock *sk); 770 void __mptcp_error_report(struct sock *sk); 771 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 772 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 773 { 774 return READ_ONCE(msk->snd_data_fin_enable) && 775 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 776 } 777 778 static inline void mptcp_write_space(struct sock *sk) 779 { 780 if (sk_stream_is_writeable(sk)) { 781 /* pairs with memory barrier in mptcp_poll */ 782 smp_mb(); 783 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 784 sk_stream_write_space(sk); 785 } 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 mptcp_write_space(sk); 807 } 808 809 /* The called held both the msk socket and the subflow socket locks, 810 * possibly under BH 811 */ 812 static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 813 { 814 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 815 816 if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) 817 __mptcp_sync_sndbuf(sk); 818 } 819 820 /* the caller held only the subflow socket lock, either in process or 821 * BH context. Additionally this can be called under the msk data lock, 822 * so we can't acquire such lock here: let the delegate action acquires 823 * the needed locks in suitable order. 824 */ 825 static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 826 { 827 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 828 829 if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) 830 return; 831 832 local_bh_disable(); 833 mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); 834 local_bh_enable(); 835 } 836 837 void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 838 839 #define MPTCP_TOKEN_MAX_RETRIES 4 840 841 void __init mptcp_token_init(void); 842 static inline void mptcp_token_init_request(struct request_sock *req) 843 { 844 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 845 } 846 847 int mptcp_token_new_request(struct request_sock *req); 848 void mptcp_token_destroy_request(struct request_sock *req); 849 int mptcp_token_new_connect(struct sock *ssk); 850 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 851 struct mptcp_sock *msk); 852 bool mptcp_token_exists(u32 token); 853 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 854 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 855 long *s_num); 856 void mptcp_token_destroy(struct mptcp_sock *msk); 857 858 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 859 860 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 861 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 862 863 void __init mptcp_pm_init(void); 864 void mptcp_pm_data_init(struct mptcp_sock *msk); 865 void mptcp_pm_data_reset(struct mptcp_sock *msk); 866 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 867 struct mptcp_addr_info *addr); 868 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 869 bool require_family, 870 struct mptcp_pm_addr_entry *entry); 871 bool mptcp_pm_addr_families_match(const struct sock *sk, 872 const struct mptcp_addr_info *loc, 873 const struct mptcp_addr_info *rem); 874 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 875 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 876 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 877 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 878 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 879 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 880 void mptcp_pm_subflow_established(struct mptcp_sock *msk); 881 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 882 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk, 883 const struct mptcp_subflow_context *subflow); 884 void mptcp_pm_add_addr_received(const struct sock *ssk, 885 const struct mptcp_addr_info *addr); 886 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 887 const struct mptcp_addr_info *addr); 888 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 889 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 890 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 891 const struct mptcp_rm_list *rm_list); 892 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 893 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 894 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 895 struct mptcp_addr_info *addr, 896 struct mptcp_addr_info *rem, 897 u8 bkup); 898 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 899 const struct mptcp_addr_info *addr); 900 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 901 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 902 struct mptcp_pm_add_entry * 903 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 904 const struct mptcp_addr_info *addr, bool check_id); 905 struct mptcp_pm_add_entry * 906 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 907 const struct mptcp_addr_info *addr); 908 int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 909 unsigned int id, 910 u8 *flags, int *ifindex); 911 int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, 912 u8 *flags, int *ifindex); 913 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 914 unsigned int id, 915 u8 *flags, int *ifindex); 916 int mptcp_pm_set_flags(struct net *net, struct nlattr *token, 917 struct mptcp_pm_addr_entry *loc, 918 struct mptcp_pm_addr_entry *rem, u8 bkup); 919 int mptcp_pm_nl_set_flags(struct net *net, struct mptcp_pm_addr_entry *addr, u8 bkup); 920 int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token, 921 struct mptcp_pm_addr_entry *loc, 922 struct mptcp_pm_addr_entry *rem, u8 bkup); 923 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 924 const struct mptcp_addr_info *addr, 925 bool echo); 926 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 927 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 928 void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); 929 void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 930 struct list_head *rm_list); 931 932 void mptcp_free_local_addr_list(struct mptcp_sock *msk); 933 int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info); 934 int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info); 935 int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info); 936 int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info); 937 938 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 939 const struct sock *ssk, gfp_t gfp); 940 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 941 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 942 void mptcp_event_pm_listener(const struct sock *ssk, 943 enum mptcp_event_type event); 944 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 945 946 void __mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 947 const struct mptcp_options_received *mp_opt); 948 void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 949 struct request_sock *req); 950 951 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 952 { 953 return READ_ONCE(msk->pm.addr_signal) & 954 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 955 } 956 957 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 958 { 959 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 960 } 961 962 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 963 { 964 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 965 } 966 967 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 968 { 969 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 970 } 971 972 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 973 { 974 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 975 } 976 977 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 978 { 979 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 980 } 981 982 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 983 { 984 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 985 986 if (family == AF_INET6) 987 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 988 if (!echo) 989 len += MPTCPOPT_THMAC_LEN; 990 /* account for 2 trailing 'nop' options */ 991 if (port) 992 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 993 994 return len; 995 } 996 997 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 998 { 999 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 1000 return -EINVAL; 1001 1002 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 1003 } 1004 1005 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 1006 unsigned int opt_size, unsigned int remaining, 1007 struct mptcp_addr_info *addr, bool *echo, 1008 bool *drop_other_suboptions); 1009 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 1010 struct mptcp_rm_list *rm_list); 1011 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 1012 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1013 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1014 1015 static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow) 1016 { 1017 int local_id = READ_ONCE(subflow->local_id); 1018 1019 if (local_id < 0) 1020 return 0; 1021 return local_id; 1022 } 1023 1024 void __init mptcp_pm_nl_init(void); 1025 void mptcp_pm_nl_work(struct mptcp_sock *msk); 1026 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 1027 const struct mptcp_rm_list *rm_list); 1028 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 1029 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 1030 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 1031 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 1032 1033 /* called under PM lock */ 1034 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 1035 { 1036 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 1037 WRITE_ONCE(msk->pm.accept_subflow, true); 1038 } 1039 1040 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 1041 { 1042 spin_lock_bh(&msk->pm.lock); 1043 __mptcp_pm_close_subflow(msk); 1044 spin_unlock_bh(&msk->pm.lock); 1045 } 1046 1047 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 1048 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 1049 1050 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 1051 { 1052 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 1053 } 1054 1055 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 1056 1057 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 1058 { 1059 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1060 } 1061 1062 static inline bool mptcp_check_fallback(const struct sock *sk) 1063 { 1064 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1065 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1066 1067 return __mptcp_check_fallback(msk); 1068 } 1069 1070 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1071 { 1072 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 1073 pr_debug("TCP fallback already done (msk=%p)", msk); 1074 return; 1075 } 1076 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1077 } 1078 1079 static inline void mptcp_do_fallback(struct sock *ssk) 1080 { 1081 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1082 struct sock *sk = subflow->conn; 1083 struct mptcp_sock *msk; 1084 1085 msk = mptcp_sk(sk); 1086 __mptcp_do_fallback(msk); 1087 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1088 gfp_t saved_allocation = ssk->sk_allocation; 1089 1090 /* we are in a atomic (BH) scope, override ssk default for data 1091 * fin allocation 1092 */ 1093 ssk->sk_allocation = GFP_ATOMIC; 1094 ssk->sk_shutdown |= SEND_SHUTDOWN; 1095 tcp_shutdown(ssk, SEND_SHUTDOWN); 1096 ssk->sk_allocation = saved_allocation; 1097 } 1098 } 1099 1100 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 1101 1102 static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 1103 { 1104 struct mptcp_ext *mpext; 1105 1106 mpext = skb ? mptcp_get_ext(skb) : NULL; 1107 if (mpext && mpext->infinite_map) 1108 return true; 1109 1110 return false; 1111 } 1112 1113 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 1114 { 1115 return (subflow->request_mptcp || subflow->request_join); 1116 } 1117 1118 static inline bool subflow_simultaneous_connect(struct sock *sk) 1119 { 1120 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1121 1122 return (1 << sk->sk_state) & 1123 (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING) && 1124 is_active_ssk(subflow) && 1125 !subflow->conn_finished; 1126 } 1127 1128 #ifdef CONFIG_SYN_COOKIES 1129 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1130 struct sk_buff *skb); 1131 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1132 struct sk_buff *skb); 1133 void __init mptcp_join_cookie_init(void); 1134 #else 1135 static inline void 1136 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1137 struct sk_buff *skb) {} 1138 static inline bool 1139 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1140 struct sk_buff *skb) 1141 { 1142 return false; 1143 } 1144 1145 static inline void mptcp_join_cookie_init(void) {} 1146 #endif 1147 1148 #endif /* __MPTCP_PROTOCOL_H */ 1149