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_WORK_RTX 1 117 #define MPTCP_FALLBACK_DONE 2 118 #define MPTCP_WORK_CLOSE_SUBFLOW 3 119 120 /* MPTCP socket release cb flags */ 121 #define MPTCP_PUSH_PENDING 1 122 #define MPTCP_CLEAN_UNA 2 123 #define MPTCP_ERROR_REPORT 3 124 #define MPTCP_RETRANSMIT 4 125 #define MPTCP_FLUSH_JOIN_LIST 5 126 #define MPTCP_SYNC_STATE 6 127 #define MPTCP_SYNC_SNDBUF 7 128 129 struct mptcp_skb_cb { 130 u64 map_seq; 131 u64 end_seq; 132 u32 offset; 133 u8 has_rxtstamp:1; 134 }; 135 136 #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) 137 138 static inline bool before64(__u64 seq1, __u64 seq2) 139 { 140 return (__s64)(seq1 - seq2) < 0; 141 } 142 143 #define after64(seq2, seq1) before64(seq1, seq2) 144 145 struct mptcp_options_received { 146 u64 sndr_key; 147 u64 rcvr_key; 148 u64 data_ack; 149 u64 data_seq; 150 u32 subflow_seq; 151 u16 data_len; 152 __sum16 csum; 153 u16 suboptions; 154 u32 token; 155 u32 nonce; 156 u16 use_map:1, 157 dsn64:1, 158 data_fin:1, 159 use_ack:1, 160 ack64:1, 161 mpc_map:1, 162 reset_reason:4, 163 reset_transient:1, 164 echo:1, 165 backup:1, 166 deny_join_id0:1, 167 __unused:2; 168 u8 join_id; 169 u64 thmac; 170 u8 hmac[MPTCPOPT_HMAC_LEN]; 171 struct mptcp_addr_info addr; 172 struct mptcp_rm_list rm_list; 173 u64 ahmac; 174 u64 fail_seq; 175 }; 176 177 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 178 { 179 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 180 ((nib & 0xF) << 8) | field); 181 } 182 183 enum mptcp_pm_status { 184 MPTCP_PM_ADD_ADDR_RECEIVED, 185 MPTCP_PM_ADD_ADDR_SEND_ACK, 186 MPTCP_PM_RM_ADDR_RECEIVED, 187 MPTCP_PM_ESTABLISHED, 188 MPTCP_PM_SUBFLOW_ESTABLISHED, 189 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 190 MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is 191 * accounted int id_avail_bitmap 192 */ 193 }; 194 195 enum mptcp_pm_type { 196 MPTCP_PM_TYPE_KERNEL = 0, 197 MPTCP_PM_TYPE_USERSPACE, 198 199 __MPTCP_PM_TYPE_NR, 200 __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1, 201 }; 202 203 /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */ 204 #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1) 205 206 enum mptcp_addr_signal_status { 207 MPTCP_ADD_ADDR_SIGNAL, 208 MPTCP_ADD_ADDR_ECHO, 209 MPTCP_RM_ADDR_SIGNAL, 210 }; 211 212 /* max value of mptcp_addr_info.id */ 213 #define MPTCP_PM_MAX_ADDR_ID U8_MAX 214 215 struct mptcp_pm_data { 216 struct mptcp_addr_info local; 217 struct mptcp_addr_info remote; 218 struct list_head anno_list; 219 struct list_head userspace_pm_local_addr_list; 220 221 spinlock_t lock; /*protects the whole PM data */ 222 223 u8 addr_signal; 224 bool server_side; 225 bool work_pending; 226 bool accept_addr; 227 bool accept_subflow; 228 bool remote_deny_join_id0; 229 u8 add_addr_signaled; 230 u8 add_addr_accepted; 231 u8 local_addr_used; 232 u8 pm_type; 233 u8 subflows; 234 u8 status; 235 DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 236 struct mptcp_rm_list rm_list_tx; 237 struct mptcp_rm_list rm_list_rx; 238 }; 239 240 struct mptcp_pm_addr_entry { 241 struct list_head list; 242 struct mptcp_addr_info addr; 243 u8 flags; 244 int ifindex; 245 struct socket *lsk; 246 }; 247 248 struct mptcp_data_frag { 249 struct list_head list; 250 u64 data_seq; 251 u16 data_len; 252 u16 offset; 253 u16 overhead; 254 u16 already_sent; 255 struct page *page; 256 }; 257 258 /* MPTCP connection sock */ 259 struct mptcp_sock { 260 /* inet_connection_sock must be the first member */ 261 struct inet_connection_sock sk; 262 u64 local_key; /* protected by the first subflow socket lock 263 * lockless access read 264 */ 265 u64 remote_key; /* same as above */ 266 u64 write_seq; 267 u64 bytes_sent; 268 u64 snd_nxt; 269 u64 bytes_received; 270 u64 ack_seq; 271 atomic64_t rcv_wnd_sent; 272 u64 rcv_data_fin_seq; 273 u64 bytes_retrans; 274 u64 bytes_consumed; 275 int rmem_fwd_alloc; 276 int snd_burst; 277 int old_wspace; 278 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 279 * recovery related fields are under data_lock 280 * protection 281 */ 282 u64 bytes_acked; 283 u64 snd_una; 284 u64 wnd_end; 285 u32 last_data_sent; 286 u32 last_data_recv; 287 u32 last_ack_recv; 288 unsigned long timer_ival; 289 u32 token; 290 int rmem_released; 291 unsigned long flags; 292 unsigned long cb_flags; 293 bool recovery; /* closing subflow write queue reinjected */ 294 bool can_ack; 295 bool fully_established; 296 bool rcv_data_fin; 297 bool snd_data_fin_enable; 298 bool rcv_fastclose; 299 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 300 bool csum_enabled; 301 bool allow_infinite_fallback; 302 u8 pending_state; /* A subflow asked to set this sk_state, 303 * protected by the msk data lock 304 */ 305 u8 mpc_endpoint_id; 306 u8 recvmsg_inq:1, 307 cork:1, 308 nodelay:1, 309 fastopening:1, 310 in_accept_queue:1, 311 free_first:1, 312 rcvspace_init:1; 313 u32 notsent_lowat; 314 struct work_struct work; 315 struct sk_buff *ooo_last_skb; 316 struct rb_root out_of_order_queue; 317 struct sk_buff_head receive_queue; 318 struct list_head conn_list; 319 struct list_head rtx_queue; 320 struct mptcp_data_frag *first_pending; 321 struct list_head join_list; 322 struct sock *first; /* The mptcp ops can safely dereference, using suitable 323 * ONCE annotation, the subflow outside the socket 324 * lock as such sock is freed after close(). 325 */ 326 struct mptcp_pm_data pm; 327 struct mptcp_sched_ops *sched; 328 struct { 329 u32 space; /* bytes copied in last measurement window */ 330 u32 copied; /* bytes copied in this measurement window */ 331 u64 time; /* start time of measurement window */ 332 u64 rtt_us; /* last maximum rtt of subflows */ 333 } rcvq_space; 334 u8 scaling_ratio; 335 336 u32 subflow_id; 337 u32 setsockopt_seq; 338 char ca_name[TCP_CA_NAME_MAX]; 339 }; 340 341 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 342 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 343 344 #define mptcp_for_each_subflow(__msk, __subflow) \ 345 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 346 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 347 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 348 349 extern struct genl_family mptcp_genl_family; 350 351 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 352 { 353 sock_owned_by_me((const struct sock *)msk); 354 } 355 356 #ifdef CONFIG_DEBUG_NET 357 /* MPTCP-specific: we might (indirectly) call this helper with the wrong sk */ 358 #undef tcp_sk 359 #define tcp_sk(ptr) ({ \ 360 typeof(ptr) _ptr = (ptr); \ 361 WARN_ON(_ptr->sk_protocol != IPPROTO_TCP); \ 362 container_of_const(_ptr, struct tcp_sock, inet_conn.icsk_inet.sk); \ 363 }) 364 #define mptcp_sk(ptr) ({ \ 365 typeof(ptr) _ptr = (ptr); \ 366 WARN_ON(_ptr->sk_protocol != IPPROTO_MPTCP); \ 367 container_of_const(_ptr, struct mptcp_sock, sk.icsk_inet.sk); \ 368 }) 369 370 #else /* !CONFIG_DEBUG_NET */ 371 #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 372 #endif 373 374 /* the msk socket don't use the backlog, also account for the bulk 375 * free memory 376 */ 377 static inline int __mptcp_rmem(const struct sock *sk) 378 { 379 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 380 } 381 382 static inline int mptcp_win_from_space(const struct sock *sk, int space) 383 { 384 return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); 385 } 386 387 static inline int __mptcp_space(const struct sock *sk) 388 { 389 return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 390 } 391 392 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 393 { 394 const struct mptcp_sock *msk = mptcp_sk(sk); 395 396 return READ_ONCE(msk->first_pending); 397 } 398 399 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 400 { 401 struct mptcp_sock *msk = mptcp_sk(sk); 402 struct mptcp_data_frag *cur; 403 404 cur = msk->first_pending; 405 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 406 list_next_entry(cur, list); 407 } 408 409 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 410 { 411 const struct mptcp_sock *msk = mptcp_sk(sk); 412 413 if (!msk->first_pending) 414 return NULL; 415 416 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 417 return NULL; 418 419 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 420 } 421 422 static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 423 { 424 struct mptcp_sock *msk = mptcp_sk(sk); 425 426 if (msk->snd_una == msk->snd_nxt) 427 return NULL; 428 429 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 430 } 431 432 struct csum_pseudo_header { 433 __be64 data_seq; 434 __be32 subflow_seq; 435 __be16 data_len; 436 __sum16 csum; 437 }; 438 439 struct mptcp_subflow_request_sock { 440 struct tcp_request_sock sk; 441 u16 mp_capable : 1, 442 mp_join : 1, 443 backup : 1, 444 csum_reqd : 1, 445 allow_join_id0 : 1; 446 u8 local_id; 447 u8 remote_id; 448 u64 local_key; 449 u64 idsn; 450 u32 token; 451 u32 ssn_offset; 452 u64 thmac; 453 u32 local_nonce; 454 u32 remote_nonce; 455 struct mptcp_sock *msk; 456 struct hlist_nulls_node token_node; 457 }; 458 459 static inline struct mptcp_subflow_request_sock * 460 mptcp_subflow_rsk(const struct request_sock *rsk) 461 { 462 return (struct mptcp_subflow_request_sock *)rsk; 463 } 464 465 struct mptcp_delegated_action { 466 struct napi_struct napi; 467 struct list_head head; 468 }; 469 470 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 471 472 #define MPTCP_DELEGATE_SCHEDULED 0 473 #define MPTCP_DELEGATE_SEND 1 474 #define MPTCP_DELEGATE_ACK 2 475 #define MPTCP_DELEGATE_SNDBUF 3 476 477 #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 478 /* MPTCP subflow context */ 479 struct mptcp_subflow_context { 480 struct list_head node;/* conn_list of subflows */ 481 482 struct_group(reset, 483 484 unsigned long avg_pacing_rate; /* protected by msk socket lock */ 485 u64 local_key; 486 u64 remote_key; 487 u64 idsn; 488 u64 map_seq; 489 u32 snd_isn; 490 u32 token; 491 u32 rel_write_seq; 492 u32 map_subflow_seq; 493 u32 ssn_offset; 494 u32 map_data_len; 495 __wsum map_data_csum; 496 u32 map_csum_len; 497 u32 request_mptcp : 1, /* send MP_CAPABLE */ 498 request_join : 1, /* send MP_JOIN */ 499 request_bkup : 1, 500 mp_capable : 1, /* remote is MPTCP capable */ 501 mp_join : 1, /* remote is JOINing */ 502 fully_established : 1, /* path validated */ 503 pm_notified : 1, /* PM hook called for established status */ 504 conn_finished : 1, 505 map_valid : 1, 506 map_csum_reqd : 1, 507 map_data_fin : 1, 508 mpc_map : 1, 509 backup : 1, 510 send_mp_prio : 1, 511 send_mp_fail : 1, 512 send_fastclose : 1, 513 send_infinite_map : 1, 514 remote_key_valid : 1, /* received the peer key from */ 515 disposable : 1, /* ctx can be free at ulp release time */ 516 stale : 1, /* unable to snd/rcv data, do not use for xmit */ 517 valid_csum_seen : 1, /* at least one csum validated */ 518 is_mptfo : 1, /* subflow is doing TFO */ 519 __unused : 10; 520 bool data_avail; 521 bool scheduled; 522 u32 remote_nonce; 523 u64 thmac; 524 u32 local_nonce; 525 u32 remote_token; 526 union { 527 u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 528 u64 iasn; /* initial ack sequence number, MPC subflows only */ 529 }; 530 s16 local_id; /* if negative not initialized yet */ 531 u8 remote_id; 532 u8 reset_seen:1; 533 u8 reset_transient:1; 534 u8 reset_reason:4; 535 u8 stale_count; 536 537 u32 subflow_id; 538 539 long delegated_status; 540 unsigned long fail_tout; 541 542 ); 543 544 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 545 546 u32 setsockopt_seq; 547 u32 stale_rcv_tstamp; 548 int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, 549 * protected by the msk socket lock 550 */ 551 552 struct sock *tcp_sock; /* tcp sk backpointer */ 553 struct sock *conn; /* parent mptcp_sock */ 554 const struct inet_connection_sock_af_ops *icsk_af_ops; 555 void (*tcp_state_change)(struct sock *sk); 556 void (*tcp_error_report)(struct sock *sk); 557 558 struct rcu_head rcu; 559 }; 560 561 static inline struct mptcp_subflow_context * 562 mptcp_subflow_ctx(const struct sock *sk) 563 { 564 const struct inet_connection_sock *icsk = inet_csk(sk); 565 566 /* Use RCU on icsk_ulp_data only for sock diag code */ 567 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 568 } 569 570 static inline struct sock * 571 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 572 { 573 return subflow->tcp_sock; 574 } 575 576 static inline void 577 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 578 { 579 memset(&subflow->reset, 0, sizeof(subflow->reset)); 580 subflow->request_mptcp = 1; 581 WRITE_ONCE(subflow->local_id, -1); 582 } 583 584 static inline u64 585 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 586 { 587 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 588 subflow->ssn_offset - 589 subflow->map_subflow_seq; 590 } 591 592 static inline u64 593 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 594 { 595 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 596 } 597 598 void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 599 600 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 601 { 602 long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 603 struct mptcp_delegated_action *delegated; 604 bool schedule; 605 606 /* the caller held the subflow bh socket lock */ 607 lockdep_assert_in_softirq(); 608 609 /* The implied barrier pairs with tcp_release_cb_override() 610 * mptcp_napi_poll(), and ensures the below list check sees list 611 * updates done prior to delegated status bits changes 612 */ 613 old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 614 if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 615 if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 616 return; 617 618 delegated = this_cpu_ptr(&mptcp_delegated_actions); 619 schedule = list_empty(&delegated->head); 620 list_add_tail(&subflow->delegated_node, &delegated->head); 621 sock_hold(mptcp_subflow_tcp_sock(subflow)); 622 if (schedule) 623 napi_schedule(&delegated->napi); 624 } 625 } 626 627 static inline struct mptcp_subflow_context * 628 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 629 { 630 struct mptcp_subflow_context *ret; 631 632 if (list_empty(&delegated->head)) 633 return NULL; 634 635 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 636 list_del_init(&ret->delegated_node); 637 return ret; 638 } 639 640 int mptcp_is_enabled(const struct net *net); 641 unsigned int mptcp_get_add_addr_timeout(const struct net *net); 642 int mptcp_is_checksum_enabled(const struct net *net); 643 int mptcp_allow_join_id0(const struct net *net); 644 unsigned int mptcp_stale_loss_cnt(const struct net *net); 645 unsigned int mptcp_close_timeout(const struct sock *sk); 646 int mptcp_get_pm_type(const struct net *net); 647 const char *mptcp_get_scheduler(const struct net *net); 648 void __mptcp_subflow_fully_established(struct mptcp_sock *msk, 649 struct mptcp_subflow_context *subflow, 650 const struct mptcp_options_received *mp_opt); 651 bool __mptcp_retransmit_pending_data(struct sock *sk); 652 void mptcp_check_and_set_pending(struct sock *sk); 653 void __mptcp_push_pending(struct sock *sk, unsigned int flags); 654 bool mptcp_subflow_data_available(struct sock *sk); 655 void __init mptcp_subflow_init(void); 656 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 657 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 658 struct mptcp_subflow_context *subflow); 659 void __mptcp_subflow_send_ack(struct sock *ssk); 660 void mptcp_subflow_reset(struct sock *ssk); 661 void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 662 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 663 struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 664 bool __mptcp_close(struct sock *sk, long timeout); 665 void mptcp_cancel_work(struct sock *sk); 666 void __mptcp_unaccepted_force_close(struct sock *sk); 667 void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 668 void mptcp_set_state(struct sock *sk, int state); 669 670 bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 671 const struct mptcp_addr_info *b, bool use_port); 672 void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 673 674 /* called with sk socket lock held */ 675 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 676 const struct mptcp_addr_info *remote); 677 int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 678 struct socket **new_sock); 679 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 680 struct sockaddr_storage *addr, 681 unsigned short family); 682 struct mptcp_sched_ops *mptcp_sched_find(const char *name); 683 int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 684 void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 685 void mptcp_sched_init(void); 686 int mptcp_init_sched(struct mptcp_sock *msk, 687 struct mptcp_sched_ops *sched); 688 void mptcp_release_sched(struct mptcp_sock *msk); 689 void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 690 bool scheduled); 691 struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 692 struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 693 int mptcp_sched_get_send(struct mptcp_sock *msk); 694 int mptcp_sched_get_retrans(struct mptcp_sock *msk); 695 696 static inline u64 mptcp_data_avail(const struct mptcp_sock *msk) 697 { 698 return READ_ONCE(msk->bytes_received) - READ_ONCE(msk->bytes_consumed); 699 } 700 701 static inline bool mptcp_epollin_ready(const struct sock *sk) 702 { 703 /* mptcp doesn't have to deal with small skbs in the receive queue, 704 * at it can always coalesce them 705 */ 706 return (mptcp_data_avail(mptcp_sk(sk)) >= sk->sk_rcvlowat) || 707 (mem_cgroup_sockets_enabled && sk->sk_memcg && 708 mem_cgroup_under_socket_pressure(sk->sk_memcg)) || 709 READ_ONCE(tcp_memory_pressure); 710 } 711 712 int mptcp_set_rcvlowat(struct sock *sk, int val); 713 714 static inline bool __tcp_can_send(const struct sock *ssk) 715 { 716 /* only send if our side has not closed yet */ 717 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 718 } 719 720 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 721 { 722 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 723 if (subflow->request_join && !subflow->fully_established) 724 return false; 725 726 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 727 } 728 729 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 730 731 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 732 733 void mptcp_subflow_drop_ctx(struct sock *ssk); 734 735 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 736 struct mptcp_subflow_context *ctx) 737 { 738 sk->sk_data_ready = sock_def_readable; 739 sk->sk_state_change = ctx->tcp_state_change; 740 sk->sk_write_space = sk_stream_write_space; 741 sk->sk_error_report = ctx->tcp_error_report; 742 743 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 744 } 745 746 void __init mptcp_proto_init(void); 747 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 748 int __init mptcp_proto_v6_init(void); 749 #endif 750 751 struct sock *mptcp_sk_clone_init(const struct sock *sk, 752 const struct mptcp_options_received *mp_opt, 753 struct sock *ssk, 754 struct request_sock *req); 755 void mptcp_get_options(const struct sk_buff *skb, 756 struct mptcp_options_received *mp_opt); 757 758 void mptcp_finish_connect(struct sock *sk); 759 void __mptcp_sync_state(struct sock *sk, int state); 760 void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 761 762 static inline void mptcp_stop_tout_timer(struct sock *sk) 763 { 764 if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 765 return; 766 767 sk_stop_timer(sk, &sk->sk_timer); 768 inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 769 } 770 771 static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 772 { 773 /* avoid 0 timestamp, as that means no close timeout */ 774 inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 775 } 776 777 static inline void mptcp_start_tout_timer(struct sock *sk) 778 { 779 mptcp_set_close_tout(sk, tcp_jiffies32); 780 mptcp_reset_tout_timer(mptcp_sk(sk), 0); 781 } 782 783 static inline bool mptcp_is_fully_established(struct sock *sk) 784 { 785 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 786 READ_ONCE(mptcp_sk(sk)->fully_established); 787 } 788 789 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 790 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 791 bool mptcp_finish_join(struct sock *sk); 792 bool mptcp_schedule_work(struct sock *sk); 793 int mptcp_setsockopt(struct sock *sk, int level, int optname, 794 sockptr_t optval, unsigned int optlen); 795 int mptcp_getsockopt(struct sock *sk, int level, int optname, 796 char __user *optval, int __user *option); 797 798 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 799 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 800 { 801 if (use_64bit) 802 return cur_seq; 803 804 return __mptcp_expand_seq(old_seq, cur_seq); 805 } 806 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 807 void __mptcp_data_acked(struct sock *sk); 808 void __mptcp_error_report(struct sock *sk); 809 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 810 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 811 { 812 return READ_ONCE(msk->snd_data_fin_enable) && 813 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 814 } 815 816 static inline u32 mptcp_notsent_lowat(const struct sock *sk) 817 { 818 struct net *net = sock_net(sk); 819 u32 val; 820 821 val = READ_ONCE(mptcp_sk(sk)->notsent_lowat); 822 return val ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat); 823 } 824 825 static inline bool mptcp_stream_memory_free(const struct sock *sk, int wake) 826 { 827 const struct mptcp_sock *msk = mptcp_sk(sk); 828 u32 notsent_bytes; 829 830 notsent_bytes = READ_ONCE(msk->write_seq) - READ_ONCE(msk->snd_nxt); 831 return (notsent_bytes << wake) < mptcp_notsent_lowat(sk); 832 } 833 834 static inline bool __mptcp_stream_is_writeable(const struct sock *sk, int wake) 835 { 836 return mptcp_stream_memory_free(sk, wake) && 837 __sk_stream_is_writeable(sk, wake); 838 } 839 840 static inline void mptcp_write_space(struct sock *sk) 841 { 842 /* pairs with memory barrier in mptcp_poll */ 843 smp_mb(); 844 if (mptcp_stream_memory_free(sk, 1)) 845 sk_stream_write_space(sk); 846 } 847 848 static inline void __mptcp_sync_sndbuf(struct sock *sk) 849 { 850 struct mptcp_subflow_context *subflow; 851 int ssk_sndbuf, new_sndbuf; 852 853 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 854 return; 855 856 new_sndbuf = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_wmem[0]); 857 mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 858 ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf); 859 860 subflow->cached_sndbuf = ssk_sndbuf; 861 new_sndbuf += ssk_sndbuf; 862 } 863 864 /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */ 865 WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); 866 mptcp_write_space(sk); 867 } 868 869 /* The called held both the msk socket and the subflow socket locks, 870 * possibly under BH 871 */ 872 static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 873 { 874 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 875 876 if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) 877 __mptcp_sync_sndbuf(sk); 878 } 879 880 /* the caller held only the subflow socket lock, either in process or 881 * BH context. Additionally this can be called under the msk data lock, 882 * so we can't acquire such lock here: let the delegate action acquires 883 * the needed locks in suitable order. 884 */ 885 static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 886 { 887 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 888 889 if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) 890 return; 891 892 local_bh_disable(); 893 mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); 894 local_bh_enable(); 895 } 896 897 void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 898 899 #define MPTCP_TOKEN_MAX_RETRIES 4 900 901 void __init mptcp_token_init(void); 902 static inline void mptcp_token_init_request(struct request_sock *req) 903 { 904 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 905 } 906 907 int mptcp_token_new_request(struct request_sock *req); 908 void mptcp_token_destroy_request(struct request_sock *req); 909 int mptcp_token_new_connect(struct sock *ssk); 910 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 911 struct mptcp_sock *msk); 912 bool mptcp_token_exists(u32 token); 913 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 914 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 915 long *s_num); 916 void mptcp_token_destroy(struct mptcp_sock *msk); 917 918 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 919 920 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 921 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 922 923 void __init mptcp_pm_init(void); 924 void mptcp_pm_data_init(struct mptcp_sock *msk); 925 void mptcp_pm_data_reset(struct mptcp_sock *msk); 926 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 927 struct mptcp_addr_info *addr); 928 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 929 bool require_family, 930 struct mptcp_pm_addr_entry *entry); 931 bool mptcp_pm_addr_families_match(const struct sock *sk, 932 const struct mptcp_addr_info *loc, 933 const struct mptcp_addr_info *rem); 934 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 935 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 936 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 937 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 938 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 939 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 940 void mptcp_pm_subflow_established(struct mptcp_sock *msk); 941 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 942 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, 943 const struct mptcp_subflow_context *subflow); 944 void mptcp_pm_add_addr_received(const struct sock *ssk, 945 const struct mptcp_addr_info *addr); 946 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 947 const struct mptcp_addr_info *addr); 948 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 949 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 950 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 951 const struct mptcp_rm_list *rm_list); 952 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 953 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 954 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 955 struct mptcp_addr_info *addr, 956 struct mptcp_addr_info *rem, 957 u8 bkup); 958 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 959 const struct mptcp_addr_info *addr); 960 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 961 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 962 struct mptcp_pm_add_entry * 963 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 964 const struct mptcp_addr_info *addr, bool check_id); 965 struct mptcp_pm_add_entry * 966 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 967 const struct mptcp_addr_info *addr); 968 int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 969 unsigned int id, 970 u8 *flags, int *ifindex); 971 int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, 972 u8 *flags, int *ifindex); 973 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 974 unsigned int id, 975 u8 *flags, int *ifindex); 976 int mptcp_pm_set_flags(struct sk_buff *skb, struct genl_info *info); 977 int mptcp_pm_nl_set_flags(struct sk_buff *skb, struct genl_info *info); 978 int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info); 979 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 980 const struct mptcp_addr_info *addr, 981 bool echo); 982 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 983 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 984 void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); 985 986 void mptcp_free_local_addr_list(struct mptcp_sock *msk); 987 988 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 989 const struct sock *ssk, gfp_t gfp); 990 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 991 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 992 void mptcp_event_pm_listener(const struct sock *ssk, 993 enum mptcp_event_type event); 994 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 995 996 void __mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 997 const struct mptcp_options_received *mp_opt); 998 void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 999 struct request_sock *req); 1000 int mptcp_nl_fill_addr(struct sk_buff *skb, 1001 struct mptcp_pm_addr_entry *entry); 1002 1003 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 1004 { 1005 return READ_ONCE(msk->pm.addr_signal) & 1006 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 1007 } 1008 1009 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 1010 { 1011 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 1012 } 1013 1014 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 1015 { 1016 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 1017 } 1018 1019 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 1020 { 1021 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 1022 } 1023 1024 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 1025 { 1026 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 1027 } 1028 1029 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 1030 { 1031 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 1032 } 1033 1034 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 1035 { 1036 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 1037 1038 if (family == AF_INET6) 1039 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 1040 if (!echo) 1041 len += MPTCPOPT_THMAC_LEN; 1042 /* account for 2 trailing 'nop' options */ 1043 if (port) 1044 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 1045 1046 return len; 1047 } 1048 1049 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 1050 { 1051 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 1052 return -EINVAL; 1053 1054 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 1055 } 1056 1057 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 1058 unsigned int opt_size, unsigned int remaining, 1059 struct mptcp_addr_info *addr, bool *echo, 1060 bool *drop_other_suboptions); 1061 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 1062 struct mptcp_rm_list *rm_list); 1063 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 1064 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1065 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1066 int mptcp_pm_dump_addr(struct sk_buff *msg, struct netlink_callback *cb); 1067 int mptcp_pm_nl_dump_addr(struct sk_buff *msg, 1068 struct netlink_callback *cb); 1069 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, 1070 struct netlink_callback *cb); 1071 int mptcp_pm_get_addr(struct sk_buff *skb, struct genl_info *info); 1072 int mptcp_pm_nl_get_addr(struct sk_buff *skb, struct genl_info *info); 1073 int mptcp_userspace_pm_get_addr(struct sk_buff *skb, 1074 struct genl_info *info); 1075 1076 static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow) 1077 { 1078 int local_id = READ_ONCE(subflow->local_id); 1079 1080 if (local_id < 0) 1081 return 0; 1082 return local_id; 1083 } 1084 1085 void __init mptcp_pm_nl_init(void); 1086 void mptcp_pm_nl_work(struct mptcp_sock *msk); 1087 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 1088 const struct mptcp_rm_list *rm_list); 1089 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 1090 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 1091 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 1092 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 1093 1094 /* called under PM lock */ 1095 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 1096 { 1097 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 1098 WRITE_ONCE(msk->pm.accept_subflow, true); 1099 } 1100 1101 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 1102 { 1103 spin_lock_bh(&msk->pm.lock); 1104 __mptcp_pm_close_subflow(msk); 1105 spin_unlock_bh(&msk->pm.lock); 1106 } 1107 1108 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 1109 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 1110 1111 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 1112 { 1113 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 1114 } 1115 1116 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 1117 1118 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 1119 { 1120 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1121 } 1122 1123 static inline bool mptcp_check_fallback(const struct sock *sk) 1124 { 1125 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1126 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1127 1128 return __mptcp_check_fallback(msk); 1129 } 1130 1131 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1132 { 1133 if (__mptcp_check_fallback(msk)) { 1134 pr_debug("TCP fallback already done (msk=%p)", msk); 1135 return; 1136 } 1137 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1138 } 1139 1140 static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk) 1141 { 1142 struct sock *ssk = READ_ONCE(msk->first); 1143 1144 return ssk && ((1 << inet_sk_state_load(ssk)) & 1145 (TCPF_ESTABLISHED | TCPF_SYN_SENT | 1146 TCPF_SYN_RECV | TCPF_LISTEN)); 1147 } 1148 1149 static inline void mptcp_do_fallback(struct sock *ssk) 1150 { 1151 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1152 struct sock *sk = subflow->conn; 1153 struct mptcp_sock *msk; 1154 1155 msk = mptcp_sk(sk); 1156 __mptcp_do_fallback(msk); 1157 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1158 gfp_t saved_allocation = ssk->sk_allocation; 1159 1160 /* we are in a atomic (BH) scope, override ssk default for data 1161 * fin allocation 1162 */ 1163 ssk->sk_allocation = GFP_ATOMIC; 1164 ssk->sk_shutdown |= SEND_SHUTDOWN; 1165 tcp_shutdown(ssk, SEND_SHUTDOWN); 1166 ssk->sk_allocation = saved_allocation; 1167 } 1168 } 1169 1170 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 1171 1172 static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 1173 { 1174 struct mptcp_ext *mpext; 1175 1176 mpext = skb ? mptcp_get_ext(skb) : NULL; 1177 if (mpext && mpext->infinite_map) 1178 return true; 1179 1180 return false; 1181 } 1182 1183 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 1184 { 1185 return (subflow->request_mptcp || subflow->request_join); 1186 } 1187 1188 static inline bool subflow_simultaneous_connect(struct sock *sk) 1189 { 1190 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1191 1192 return (1 << sk->sk_state) & 1193 (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING) && 1194 is_active_ssk(subflow) && 1195 !subflow->conn_finished; 1196 } 1197 1198 #ifdef CONFIG_SYN_COOKIES 1199 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1200 struct sk_buff *skb); 1201 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1202 struct sk_buff *skb); 1203 void __init mptcp_join_cookie_init(void); 1204 #else 1205 static inline void 1206 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1207 struct sk_buff *skb) {} 1208 static inline bool 1209 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1210 struct sk_buff *skb) 1211 { 1212 return false; 1213 } 1214 1215 static inline void mptcp_join_cookie_init(void) {} 1216 #endif 1217 1218 #endif /* __MPTCP_PROTOCOL_H */ 1219