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 #include <net/rstreason.h> 16 17 #define MPTCP_SUPPORTED_VERSION 1 18 19 /* MPTCP option bits */ 20 #define OPTION_MPTCP_MPC_SYN BIT(0) 21 #define OPTION_MPTCP_MPC_SYNACK BIT(1) 22 #define OPTION_MPTCP_MPC_ACK BIT(2) 23 #define OPTION_MPTCP_MPJ_SYN BIT(3) 24 #define OPTION_MPTCP_MPJ_SYNACK BIT(4) 25 #define OPTION_MPTCP_MPJ_ACK BIT(5) 26 #define OPTION_MPTCP_ADD_ADDR BIT(6) 27 #define OPTION_MPTCP_RM_ADDR BIT(7) 28 #define OPTION_MPTCP_FASTCLOSE BIT(8) 29 #define OPTION_MPTCP_PRIO BIT(9) 30 #define OPTION_MPTCP_RST BIT(10) 31 #define OPTION_MPTCP_DSS BIT(11) 32 #define OPTION_MPTCP_FAIL BIT(12) 33 34 #define OPTION_MPTCP_CSUMREQD BIT(13) 35 36 #define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \ 37 OPTION_MPTCP_MPC_ACK) 38 #define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \ 39 OPTION_MPTCP_MPJ_ACK) 40 41 /* MPTCP option subtypes */ 42 #define MPTCPOPT_MP_CAPABLE 0 43 #define MPTCPOPT_MP_JOIN 1 44 #define MPTCPOPT_DSS 2 45 #define MPTCPOPT_ADD_ADDR 3 46 #define MPTCPOPT_RM_ADDR 4 47 #define MPTCPOPT_MP_PRIO 5 48 #define MPTCPOPT_MP_FAIL 6 49 #define MPTCPOPT_MP_FASTCLOSE 7 50 #define MPTCPOPT_RST 8 51 52 /* MPTCP suboption lengths */ 53 #define TCPOLEN_MPTCP_MPC_SYN 4 54 #define TCPOLEN_MPTCP_MPC_SYNACK 12 55 #define TCPOLEN_MPTCP_MPC_ACK 20 56 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22 57 #define TCPOLEN_MPTCP_MPJ_SYN 12 58 #define TCPOLEN_MPTCP_MPJ_SYNACK 16 59 #define TCPOLEN_MPTCP_MPJ_ACK 24 60 #define TCPOLEN_MPTCP_DSS_BASE 4 61 #define TCPOLEN_MPTCP_DSS_ACK32 4 62 #define TCPOLEN_MPTCP_DSS_ACK64 8 63 #define TCPOLEN_MPTCP_DSS_MAP32 10 64 #define TCPOLEN_MPTCP_DSS_MAP64 14 65 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2 66 #define TCPOLEN_MPTCP_ADD_ADDR 16 67 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 68 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 69 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 70 #define TCPOLEN_MPTCP_ADD_ADDR6 28 71 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 72 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 73 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 74 #define TCPOLEN_MPTCP_PORT_LEN 2 75 #define TCPOLEN_MPTCP_PORT_ALIGN 2 76 #define TCPOLEN_MPTCP_RM_ADDR_BASE 3 77 #define TCPOLEN_MPTCP_PRIO 3 78 #define TCPOLEN_MPTCP_PRIO_ALIGN 4 79 #define TCPOLEN_MPTCP_FASTCLOSE 12 80 #define TCPOLEN_MPTCP_RST 4 81 #define TCPOLEN_MPTCP_FAIL 12 82 83 #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA) 84 85 /* MPTCP MP_JOIN flags */ 86 #define MPTCPOPT_BACKUP BIT(0) 87 #define MPTCPOPT_THMAC_LEN 8 88 89 /* MPTCP MP_CAPABLE flags */ 90 #define MPTCP_VERSION_MASK (0x0F) 91 #define MPTCP_CAP_CHECKSUM_REQD BIT(7) 92 #define MPTCP_CAP_EXTENSIBILITY BIT(6) 93 #define MPTCP_CAP_DENY_JOIN_ID0 BIT(5) 94 #define MPTCP_CAP_HMAC_SHA256 BIT(0) 95 #define MPTCP_CAP_FLAG_MASK (0x1F) 96 97 /* MPTCP DSS flags */ 98 #define MPTCP_DSS_DATA_FIN BIT(4) 99 #define MPTCP_DSS_DSN64 BIT(3) 100 #define MPTCP_DSS_HAS_MAP BIT(2) 101 #define MPTCP_DSS_ACK64 BIT(1) 102 #define MPTCP_DSS_HAS_ACK BIT(0) 103 #define MPTCP_DSS_FLAG_MASK (0x1F) 104 105 /* MPTCP ADD_ADDR flags */ 106 #define MPTCP_ADDR_ECHO BIT(0) 107 108 /* MPTCP MP_PRIO flags */ 109 #define MPTCP_PRIO_BKUP BIT(0) 110 111 /* MPTCP TCPRST flags */ 112 #define MPTCP_RST_TRANSIENT BIT(0) 113 114 /* MPTCP socket atomic flags */ 115 #define MPTCP_WORK_RTX 1 116 #define MPTCP_FALLBACK_DONE 2 117 #define MPTCP_WORK_CLOSE_SUBFLOW 3 118 119 /* 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 struct_group(status, 153 u16 suboptions; 154 u16 use_map:1, 155 dsn64:1, 156 data_fin:1, 157 use_ack:1, 158 ack64:1, 159 mpc_map:1, 160 reset_reason:4, 161 reset_transient:1, 162 echo:1, 163 backup:1, 164 deny_join_id0:1, 165 __unused:2; 166 ); 167 u8 join_id; 168 u32 token; 169 u32 nonce; 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_local { 242 struct mptcp_addr_info addr; 243 u8 flags; 244 int ifindex; 245 }; 246 247 struct mptcp_pm_addr_entry { 248 struct list_head list; 249 struct mptcp_addr_info addr; 250 u8 flags; 251 int ifindex; 252 struct socket *lsk; 253 }; 254 255 struct mptcp_data_frag { 256 struct list_head list; 257 u64 data_seq; 258 u16 data_len; 259 u16 offset; 260 u16 overhead; 261 u16 already_sent; 262 struct page *page; 263 }; 264 265 /* MPTCP connection sock */ 266 struct mptcp_sock { 267 /* inet_connection_sock must be the first member */ 268 struct inet_connection_sock sk; 269 u64 local_key; /* protected by the first subflow socket lock 270 * lockless access read 271 */ 272 u64 remote_key; /* same as above */ 273 u64 write_seq; 274 u64 bytes_sent; 275 u64 snd_nxt; 276 u64 bytes_received; 277 u64 ack_seq; 278 atomic64_t rcv_wnd_sent; 279 u64 rcv_data_fin_seq; 280 u64 bytes_retrans; 281 u64 bytes_consumed; 282 int rmem_fwd_alloc; 283 int snd_burst; 284 int old_wspace; 285 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 286 * recovery related fields are under data_lock 287 * protection 288 */ 289 u64 bytes_acked; 290 u64 snd_una; 291 u64 wnd_end; 292 u32 last_data_sent; 293 u32 last_data_recv; 294 u32 last_ack_recv; 295 unsigned long timer_ival; 296 u32 token; 297 int rmem_released; 298 unsigned long flags; 299 unsigned long cb_flags; 300 bool recovery; /* closing subflow write queue reinjected */ 301 bool can_ack; 302 bool fully_established; 303 bool rcv_data_fin; 304 bool snd_data_fin_enable; 305 bool rcv_fastclose; 306 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 307 bool csum_enabled; 308 bool allow_infinite_fallback; 309 u8 pending_state; /* A subflow asked to set this sk_state, 310 * protected by the msk data lock 311 */ 312 u8 mpc_endpoint_id; 313 u8 recvmsg_inq:1, 314 cork:1, 315 nodelay:1, 316 fastopening:1, 317 in_accept_queue:1, 318 free_first:1, 319 rcvspace_init:1; 320 u32 notsent_lowat; 321 int keepalive_cnt; 322 int keepalive_idle; 323 int keepalive_intvl; 324 struct work_struct work; 325 struct sk_buff *ooo_last_skb; 326 struct rb_root out_of_order_queue; 327 struct sk_buff_head receive_queue; 328 struct list_head conn_list; 329 struct list_head rtx_queue; 330 struct mptcp_data_frag *first_pending; 331 struct list_head join_list; 332 struct sock *first; /* The mptcp ops can safely dereference, using suitable 333 * ONCE annotation, the subflow outside the socket 334 * lock as such sock is freed after close(). 335 */ 336 struct mptcp_pm_data pm; 337 struct mptcp_sched_ops *sched; 338 struct { 339 u32 space; /* bytes copied in last measurement window */ 340 u32 copied; /* bytes copied in this measurement window */ 341 u64 time; /* start time of measurement window */ 342 u64 rtt_us; /* last maximum rtt of subflows */ 343 } rcvq_space; 344 u8 scaling_ratio; 345 346 u32 subflow_id; 347 u32 setsockopt_seq; 348 char ca_name[TCP_CA_NAME_MAX]; 349 }; 350 351 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 352 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 353 354 #define mptcp_for_each_subflow(__msk, __subflow) \ 355 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 356 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 357 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 358 359 extern struct genl_family mptcp_genl_family; 360 361 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 362 { 363 sock_owned_by_me((const struct sock *)msk); 364 } 365 366 #ifdef CONFIG_DEBUG_NET 367 /* MPTCP-specific: we might (indirectly) call this helper with the wrong sk */ 368 #undef tcp_sk 369 #define tcp_sk(ptr) ({ \ 370 typeof(ptr) _ptr = (ptr); \ 371 WARN_ON(_ptr->sk_protocol != IPPROTO_TCP); \ 372 container_of_const(_ptr, struct tcp_sock, inet_conn.icsk_inet.sk); \ 373 }) 374 #define mptcp_sk(ptr) ({ \ 375 typeof(ptr) _ptr = (ptr); \ 376 WARN_ON(_ptr->sk_protocol != IPPROTO_MPTCP); \ 377 container_of_const(_ptr, struct mptcp_sock, sk.icsk_inet.sk); \ 378 }) 379 380 #else /* !CONFIG_DEBUG_NET */ 381 #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 382 #endif 383 384 /* the msk socket don't use the backlog, also account for the bulk 385 * free memory 386 */ 387 static inline int __mptcp_rmem(const struct sock *sk) 388 { 389 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 390 } 391 392 static inline int mptcp_win_from_space(const struct sock *sk, int space) 393 { 394 return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); 395 } 396 397 static inline int mptcp_space_from_win(const struct sock *sk, int win) 398 { 399 return __tcp_space_from_win(mptcp_sk(sk)->scaling_ratio, win); 400 } 401 402 static inline int __mptcp_space(const struct sock *sk) 403 { 404 return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 405 } 406 407 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 408 { 409 const struct mptcp_sock *msk = mptcp_sk(sk); 410 411 return READ_ONCE(msk->first_pending); 412 } 413 414 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 415 { 416 struct mptcp_sock *msk = mptcp_sk(sk); 417 struct mptcp_data_frag *cur; 418 419 cur = msk->first_pending; 420 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 421 list_next_entry(cur, list); 422 } 423 424 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 425 { 426 const struct mptcp_sock *msk = mptcp_sk(sk); 427 428 if (!msk->first_pending) 429 return NULL; 430 431 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 432 return NULL; 433 434 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 435 } 436 437 static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 438 { 439 struct mptcp_sock *msk = mptcp_sk(sk); 440 441 if (msk->snd_una == msk->snd_nxt) 442 return NULL; 443 444 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 445 } 446 447 struct csum_pseudo_header { 448 __be64 data_seq; 449 __be32 subflow_seq; 450 __be16 data_len; 451 __sum16 csum; 452 }; 453 454 struct mptcp_subflow_request_sock { 455 struct tcp_request_sock sk; 456 u16 mp_capable : 1, 457 mp_join : 1, 458 backup : 1, 459 request_bkup : 1, 460 csum_reqd : 1, 461 allow_join_id0 : 1; 462 u8 local_id; 463 u8 remote_id; 464 u64 local_key; 465 u64 idsn; 466 u32 token; 467 u32 ssn_offset; 468 u64 thmac; 469 u32 local_nonce; 470 u32 remote_nonce; 471 struct mptcp_sock *msk; 472 struct hlist_nulls_node token_node; 473 }; 474 475 static inline struct mptcp_subflow_request_sock * 476 mptcp_subflow_rsk(const struct request_sock *rsk) 477 { 478 return (struct mptcp_subflow_request_sock *)rsk; 479 } 480 481 struct mptcp_delegated_action { 482 struct napi_struct napi; 483 struct list_head head; 484 }; 485 486 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 487 488 #define MPTCP_DELEGATE_SCHEDULED 0 489 #define MPTCP_DELEGATE_SEND 1 490 #define MPTCP_DELEGATE_ACK 2 491 #define MPTCP_DELEGATE_SNDBUF 3 492 493 #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 494 /* MPTCP subflow context */ 495 struct mptcp_subflow_context { 496 struct list_head node;/* conn_list of subflows */ 497 498 struct_group(reset, 499 500 unsigned long avg_pacing_rate; /* protected by msk socket lock */ 501 u64 local_key; 502 u64 remote_key; 503 u64 idsn; 504 u64 map_seq; 505 u32 snd_isn; 506 u32 token; 507 u32 rel_write_seq; 508 u32 map_subflow_seq; 509 u32 ssn_offset; 510 u32 map_data_len; 511 __wsum map_data_csum; 512 u32 map_csum_len; 513 u32 request_mptcp : 1, /* send MP_CAPABLE */ 514 request_join : 1, /* send MP_JOIN */ 515 request_bkup : 1, 516 mp_capable : 1, /* remote is MPTCP capable */ 517 mp_join : 1, /* remote is JOINing */ 518 pm_notified : 1, /* PM hook called for established status */ 519 conn_finished : 1, 520 map_valid : 1, 521 map_csum_reqd : 1, 522 map_data_fin : 1, 523 mpc_map : 1, 524 backup : 1, 525 send_mp_prio : 1, 526 send_mp_fail : 1, 527 send_fastclose : 1, 528 send_infinite_map : 1, 529 remote_key_valid : 1, /* received the peer key from */ 530 disposable : 1, /* ctx can be free at ulp release time */ 531 stale : 1, /* unable to snd/rcv data, do not use for xmit */ 532 valid_csum_seen : 1, /* at least one csum validated */ 533 is_mptfo : 1, /* subflow is doing TFO */ 534 close_event_done : 1, /* has done the post-closed part */ 535 mpc_drop : 1, /* the MPC option has been dropped in a rtx */ 536 __unused : 9; 537 bool data_avail; 538 bool scheduled; 539 bool pm_listener; /* a listener managed by the kernel PM? */ 540 bool fully_established; /* path validated */ 541 u32 remote_nonce; 542 u64 thmac; 543 u32 local_nonce; 544 u32 remote_token; 545 union { 546 u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 547 u64 iasn; /* initial ack sequence number, MPC subflows only */ 548 }; 549 s16 local_id; /* if negative not initialized yet */ 550 u8 remote_id; 551 u8 reset_seen:1; 552 u8 reset_transient:1; 553 u8 reset_reason:4; 554 u8 stale_count; 555 556 u32 subflow_id; 557 558 long delegated_status; 559 unsigned long fail_tout; 560 561 ); 562 563 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 564 565 u32 setsockopt_seq; 566 u32 stale_rcv_tstamp; 567 int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, 568 * protected by the msk socket lock 569 */ 570 571 struct sock *tcp_sock; /* tcp sk backpointer */ 572 struct sock *conn; /* parent mptcp_sock */ 573 const struct inet_connection_sock_af_ops *icsk_af_ops; 574 void (*tcp_state_change)(struct sock *sk); 575 void (*tcp_error_report)(struct sock *sk); 576 577 struct rcu_head rcu; 578 }; 579 580 static inline struct mptcp_subflow_context * 581 mptcp_subflow_ctx(const struct sock *sk) 582 { 583 const struct inet_connection_sock *icsk = inet_csk(sk); 584 585 /* Use RCU on icsk_ulp_data only for sock diag code */ 586 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 587 } 588 589 static inline struct sock * 590 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 591 { 592 return subflow->tcp_sock; 593 } 594 595 static inline void 596 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 597 { 598 memset(&subflow->reset, 0, sizeof(subflow->reset)); 599 subflow->request_mptcp = 1; 600 WRITE_ONCE(subflow->local_id, -1); 601 } 602 603 /* Convert reset reasons in MPTCP to enum sk_rst_reason type */ 604 static inline enum sk_rst_reason 605 sk_rst_convert_mptcp_reason(u32 reason) 606 { 607 switch (reason) { 608 case MPTCP_RST_EUNSPEC: 609 return SK_RST_REASON_MPTCP_RST_EUNSPEC; 610 case MPTCP_RST_EMPTCP: 611 return SK_RST_REASON_MPTCP_RST_EMPTCP; 612 case MPTCP_RST_ERESOURCE: 613 return SK_RST_REASON_MPTCP_RST_ERESOURCE; 614 case MPTCP_RST_EPROHIBIT: 615 return SK_RST_REASON_MPTCP_RST_EPROHIBIT; 616 case MPTCP_RST_EWQ2BIG: 617 return SK_RST_REASON_MPTCP_RST_EWQ2BIG; 618 case MPTCP_RST_EBADPERF: 619 return SK_RST_REASON_MPTCP_RST_EBADPERF; 620 case MPTCP_RST_EMIDDLEBOX: 621 return SK_RST_REASON_MPTCP_RST_EMIDDLEBOX; 622 default: 623 /* It should not happen, or else errors may occur 624 * in MPTCP layer 625 */ 626 return SK_RST_REASON_ERROR; 627 } 628 } 629 630 static inline void 631 mptcp_send_active_reset_reason(struct sock *sk) 632 { 633 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 634 enum sk_rst_reason reason; 635 636 reason = sk_rst_convert_mptcp_reason(subflow->reset_reason); 637 tcp_send_active_reset(sk, GFP_ATOMIC, reason); 638 } 639 640 static inline u64 641 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 642 { 643 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 644 subflow->ssn_offset - 645 subflow->map_subflow_seq; 646 } 647 648 static inline u64 649 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 650 { 651 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 652 } 653 654 void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 655 656 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 657 { 658 long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 659 struct mptcp_delegated_action *delegated; 660 bool schedule; 661 662 /* the caller held the subflow bh socket lock */ 663 lockdep_assert_in_softirq(); 664 665 /* The implied barrier pairs with tcp_release_cb_override() 666 * mptcp_napi_poll(), and ensures the below list check sees list 667 * updates done prior to delegated status bits changes 668 */ 669 old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 670 if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 671 if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 672 return; 673 674 delegated = this_cpu_ptr(&mptcp_delegated_actions); 675 schedule = list_empty(&delegated->head); 676 list_add_tail(&subflow->delegated_node, &delegated->head); 677 sock_hold(mptcp_subflow_tcp_sock(subflow)); 678 if (schedule) 679 napi_schedule(&delegated->napi); 680 } 681 } 682 683 static inline struct mptcp_subflow_context * 684 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 685 { 686 struct mptcp_subflow_context *ret; 687 688 if (list_empty(&delegated->head)) 689 return NULL; 690 691 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 692 list_del_init(&ret->delegated_node); 693 return ret; 694 } 695 696 int mptcp_is_enabled(const struct net *net); 697 unsigned int mptcp_get_add_addr_timeout(const struct net *net); 698 int mptcp_is_checksum_enabled(const struct net *net); 699 int mptcp_allow_join_id0(const struct net *net); 700 unsigned int mptcp_stale_loss_cnt(const struct net *net); 701 unsigned int mptcp_close_timeout(const struct sock *sk); 702 int mptcp_get_pm_type(const struct net *net); 703 const char *mptcp_get_scheduler(const struct net *net); 704 705 void mptcp_active_disable(struct sock *sk); 706 bool mptcp_active_should_disable(struct sock *ssk); 707 void mptcp_active_enable(struct sock *sk); 708 709 void mptcp_get_available_schedulers(char *buf, size_t maxlen); 710 void __mptcp_subflow_fully_established(struct mptcp_sock *msk, 711 struct mptcp_subflow_context *subflow, 712 const struct mptcp_options_received *mp_opt); 713 bool __mptcp_retransmit_pending_data(struct sock *sk); 714 void mptcp_check_and_set_pending(struct sock *sk); 715 void __mptcp_push_pending(struct sock *sk, unsigned int flags); 716 bool mptcp_subflow_data_available(struct sock *sk); 717 void __init mptcp_subflow_init(void); 718 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 719 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 720 struct mptcp_subflow_context *subflow); 721 void __mptcp_subflow_send_ack(struct sock *ssk); 722 void mptcp_subflow_reset(struct sock *ssk); 723 void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 724 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 725 struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 726 bool __mptcp_close(struct sock *sk, long timeout); 727 void mptcp_cancel_work(struct sock *sk); 728 void __mptcp_unaccepted_force_close(struct sock *sk); 729 void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 730 void mptcp_set_state(struct sock *sk, int state); 731 732 bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 733 const struct mptcp_addr_info *b, bool use_port); 734 void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 735 736 /* called with sk socket lock held */ 737 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_pm_local *local, 738 const struct mptcp_addr_info *remote); 739 int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 740 struct socket **new_sock); 741 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 742 struct sockaddr_storage *addr, 743 unsigned short family); 744 struct mptcp_sched_ops *mptcp_sched_find(const char *name); 745 int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 746 void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 747 void mptcp_sched_init(void); 748 int mptcp_init_sched(struct mptcp_sock *msk, 749 struct mptcp_sched_ops *sched); 750 void mptcp_release_sched(struct mptcp_sock *msk); 751 void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 752 bool scheduled); 753 struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 754 struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 755 int mptcp_sched_get_send(struct mptcp_sock *msk); 756 int mptcp_sched_get_retrans(struct mptcp_sock *msk); 757 758 static inline u64 mptcp_data_avail(const struct mptcp_sock *msk) 759 { 760 return READ_ONCE(msk->bytes_received) - READ_ONCE(msk->bytes_consumed); 761 } 762 763 static inline bool mptcp_epollin_ready(const struct sock *sk) 764 { 765 u64 data_avail = mptcp_data_avail(mptcp_sk(sk)); 766 767 if (!data_avail) 768 return false; 769 770 /* mptcp doesn't have to deal with small skbs in the receive queue, 771 * as it can always coalesce them 772 */ 773 return (data_avail >= sk->sk_rcvlowat) || 774 (mem_cgroup_sockets_enabled && sk->sk_memcg && 775 mem_cgroup_under_socket_pressure(sk->sk_memcg)) || 776 READ_ONCE(tcp_memory_pressure); 777 } 778 779 int mptcp_set_rcvlowat(struct sock *sk, int val); 780 781 static inline bool __tcp_can_send(const struct sock *ssk) 782 { 783 /* only send if our side has not closed yet */ 784 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 785 } 786 787 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 788 { 789 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 790 if (subflow->request_join && !READ_ONCE(subflow->fully_established)) 791 return false; 792 793 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 794 } 795 796 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 797 798 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 799 800 void mptcp_subflow_drop_ctx(struct sock *ssk); 801 802 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 803 struct mptcp_subflow_context *ctx) 804 { 805 sk->sk_data_ready = sock_def_readable; 806 sk->sk_state_change = ctx->tcp_state_change; 807 sk->sk_write_space = sk_stream_write_space; 808 sk->sk_error_report = ctx->tcp_error_report; 809 810 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 811 } 812 813 void __init mptcp_proto_init(void); 814 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 815 int __init mptcp_proto_v6_init(void); 816 #endif 817 818 struct sock *mptcp_sk_clone_init(const struct sock *sk, 819 const struct mptcp_options_received *mp_opt, 820 struct sock *ssk, 821 struct request_sock *req); 822 void mptcp_get_options(const struct sk_buff *skb, 823 struct mptcp_options_received *mp_opt); 824 825 void mptcp_finish_connect(struct sock *sk); 826 void __mptcp_sync_state(struct sock *sk, int state); 827 void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 828 829 static inline void mptcp_stop_tout_timer(struct sock *sk) 830 { 831 if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 832 return; 833 834 sk_stop_timer(sk, &sk->sk_timer); 835 inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 836 } 837 838 static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 839 { 840 /* avoid 0 timestamp, as that means no close timeout */ 841 inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 842 } 843 844 static inline void mptcp_start_tout_timer(struct sock *sk) 845 { 846 mptcp_set_close_tout(sk, tcp_jiffies32); 847 mptcp_reset_tout_timer(mptcp_sk(sk), 0); 848 } 849 850 static inline bool mptcp_is_fully_established(struct sock *sk) 851 { 852 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 853 READ_ONCE(mptcp_sk(sk)->fully_established); 854 } 855 856 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 857 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 858 bool mptcp_finish_join(struct sock *sk); 859 bool mptcp_schedule_work(struct sock *sk); 860 int mptcp_setsockopt(struct sock *sk, int level, int optname, 861 sockptr_t optval, unsigned int optlen); 862 int mptcp_getsockopt(struct sock *sk, int level, int optname, 863 char __user *optval, int __user *option); 864 865 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 866 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 867 { 868 if (use_64bit) 869 return cur_seq; 870 871 return __mptcp_expand_seq(old_seq, cur_seq); 872 } 873 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 874 void __mptcp_data_acked(struct sock *sk); 875 void __mptcp_error_report(struct sock *sk); 876 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 877 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 878 { 879 return READ_ONCE(msk->snd_data_fin_enable) && 880 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 881 } 882 883 static inline u32 mptcp_notsent_lowat(const struct sock *sk) 884 { 885 struct net *net = sock_net(sk); 886 u32 val; 887 888 val = READ_ONCE(mptcp_sk(sk)->notsent_lowat); 889 return val ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat); 890 } 891 892 static inline bool mptcp_stream_memory_free(const struct sock *sk, int wake) 893 { 894 const struct mptcp_sock *msk = mptcp_sk(sk); 895 u32 notsent_bytes; 896 897 notsent_bytes = READ_ONCE(msk->write_seq) - READ_ONCE(msk->snd_nxt); 898 return (notsent_bytes << wake) < mptcp_notsent_lowat(sk); 899 } 900 901 static inline bool __mptcp_stream_is_writeable(const struct sock *sk, int wake) 902 { 903 return mptcp_stream_memory_free(sk, wake) && 904 __sk_stream_is_writeable(sk, wake); 905 } 906 907 static inline void mptcp_write_space(struct sock *sk) 908 { 909 /* pairs with memory barrier in mptcp_poll */ 910 smp_mb(); 911 if (mptcp_stream_memory_free(sk, 1)) 912 sk_stream_write_space(sk); 913 } 914 915 static inline void __mptcp_sync_sndbuf(struct sock *sk) 916 { 917 struct mptcp_subflow_context *subflow; 918 int ssk_sndbuf, new_sndbuf; 919 920 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 921 return; 922 923 new_sndbuf = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_wmem[0]); 924 mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 925 ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf); 926 927 subflow->cached_sndbuf = ssk_sndbuf; 928 new_sndbuf += ssk_sndbuf; 929 } 930 931 /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */ 932 WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); 933 mptcp_write_space(sk); 934 } 935 936 /* The called held both the msk socket and the subflow socket locks, 937 * possibly under BH 938 */ 939 static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 940 { 941 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 942 943 if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) 944 __mptcp_sync_sndbuf(sk); 945 } 946 947 /* the caller held only the subflow socket lock, either in process or 948 * BH context. Additionally this can be called under the msk data lock, 949 * so we can't acquire such lock here: let the delegate action acquires 950 * the needed locks in suitable order. 951 */ 952 static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 953 { 954 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 955 956 if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) 957 return; 958 959 local_bh_disable(); 960 mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); 961 local_bh_enable(); 962 } 963 964 void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 965 966 #define MPTCP_TOKEN_MAX_RETRIES 4 967 968 void __init mptcp_token_init(void); 969 static inline void mptcp_token_init_request(struct request_sock *req) 970 { 971 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 972 } 973 974 int mptcp_token_new_request(struct request_sock *req); 975 void mptcp_token_destroy_request(struct request_sock *req); 976 int mptcp_token_new_connect(struct sock *ssk); 977 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 978 struct mptcp_sock *msk); 979 bool mptcp_token_exists(u32 token); 980 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 981 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 982 long *s_num); 983 void mptcp_token_destroy(struct mptcp_sock *msk); 984 985 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 986 987 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 988 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 989 990 void __init mptcp_pm_init(void); 991 void mptcp_pm_data_init(struct mptcp_sock *msk); 992 void mptcp_pm_data_reset(struct mptcp_sock *msk); 993 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 994 struct mptcp_addr_info *addr); 995 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 996 bool require_family, 997 struct mptcp_pm_addr_entry *entry); 998 bool mptcp_pm_addr_families_match(const struct sock *sk, 999 const struct mptcp_addr_info *loc, 1000 const struct mptcp_addr_info *rem); 1001 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 1002 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 1003 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 1004 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 1005 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 1006 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 1007 void mptcp_pm_subflow_established(struct mptcp_sock *msk); 1008 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 1009 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, 1010 const struct mptcp_subflow_context *subflow); 1011 void mptcp_pm_add_addr_received(const struct sock *ssk, 1012 const struct mptcp_addr_info *addr); 1013 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 1014 const struct mptcp_addr_info *addr); 1015 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 1016 bool mptcp_pm_nl_is_init_remote_addr(struct mptcp_sock *msk, 1017 const struct mptcp_addr_info *remote); 1018 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 1019 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 1020 const struct mptcp_rm_list *rm_list); 1021 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 1022 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 1023 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 1024 struct mptcp_addr_info *addr, 1025 struct mptcp_addr_info *rem, 1026 u8 bkup); 1027 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 1028 const struct mptcp_addr_info *addr); 1029 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 1030 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 1031 struct mptcp_pm_add_entry * 1032 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 1033 const struct mptcp_addr_info *addr, bool check_id); 1034 struct mptcp_pm_add_entry * 1035 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 1036 const struct mptcp_addr_info *addr); 1037 bool mptcp_lookup_subflow_by_saddr(const struct list_head *list, 1038 const struct mptcp_addr_info *saddr); 1039 bool mptcp_remove_anno_list_by_saddr(struct mptcp_sock *msk, 1040 const struct mptcp_addr_info *addr); 1041 int mptcp_pm_set_flags(struct sk_buff *skb, struct genl_info *info); 1042 int mptcp_pm_nl_set_flags(struct sk_buff *skb, struct genl_info *info); 1043 int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info); 1044 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 1045 const struct mptcp_addr_info *addr, 1046 bool echo); 1047 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 1048 void mptcp_pm_remove_addr_entry(struct mptcp_sock *msk, 1049 struct mptcp_pm_addr_entry *entry); 1050 1051 void mptcp_free_local_addr_list(struct mptcp_sock *msk); 1052 1053 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 1054 const struct sock *ssk, gfp_t gfp); 1055 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 1056 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 1057 void mptcp_event_pm_listener(const struct sock *ssk, 1058 enum mptcp_event_type event); 1059 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 1060 1061 void __mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 1062 const struct mptcp_options_received *mp_opt); 1063 void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 1064 struct request_sock *req); 1065 int mptcp_nl_fill_addr(struct sk_buff *skb, 1066 struct mptcp_pm_addr_entry *entry); 1067 1068 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 1069 { 1070 return READ_ONCE(msk->pm.addr_signal) & 1071 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 1072 } 1073 1074 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 1075 { 1076 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 1077 } 1078 1079 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 1080 { 1081 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 1082 } 1083 1084 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 1085 { 1086 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 1087 } 1088 1089 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 1090 { 1091 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 1092 } 1093 1094 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 1095 { 1096 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 1097 } 1098 1099 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 1100 { 1101 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 1102 1103 if (family == AF_INET6) 1104 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 1105 if (!echo) 1106 len += MPTCPOPT_THMAC_LEN; 1107 /* account for 2 trailing 'nop' options */ 1108 if (port) 1109 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 1110 1111 return len; 1112 } 1113 1114 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 1115 { 1116 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 1117 return -EINVAL; 1118 1119 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 1120 } 1121 1122 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 1123 unsigned int opt_size, unsigned int remaining, 1124 struct mptcp_addr_info *addr, bool *echo, 1125 bool *drop_other_suboptions); 1126 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 1127 struct mptcp_rm_list *rm_list); 1128 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 1129 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1130 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1131 bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc); 1132 bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1133 bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1134 int mptcp_pm_dump_addr(struct sk_buff *msg, struct netlink_callback *cb); 1135 int mptcp_pm_nl_dump_addr(struct sk_buff *msg, 1136 struct netlink_callback *cb); 1137 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, 1138 struct netlink_callback *cb); 1139 int mptcp_pm_get_addr(struct sk_buff *skb, struct genl_info *info); 1140 int mptcp_pm_nl_get_addr(struct sk_buff *skb, struct genl_info *info); 1141 int mptcp_userspace_pm_get_addr(struct sk_buff *skb, 1142 struct genl_info *info); 1143 1144 static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow) 1145 { 1146 int local_id = READ_ONCE(subflow->local_id); 1147 1148 if (local_id < 0) 1149 return 0; 1150 return local_id; 1151 } 1152 1153 void __init mptcp_pm_nl_init(void); 1154 void mptcp_pm_nl_work(struct mptcp_sock *msk); 1155 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 1156 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 1157 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 1158 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 1159 1160 /* called under PM lock */ 1161 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 1162 { 1163 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 1164 WRITE_ONCE(msk->pm.accept_subflow, true); 1165 } 1166 1167 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 1168 { 1169 spin_lock_bh(&msk->pm.lock); 1170 __mptcp_pm_close_subflow(msk); 1171 spin_unlock_bh(&msk->pm.lock); 1172 } 1173 1174 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 1175 1176 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 1177 { 1178 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 1179 } 1180 1181 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 1182 1183 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 1184 { 1185 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1186 } 1187 1188 static inline bool mptcp_check_fallback(const struct sock *sk) 1189 { 1190 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1191 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1192 1193 return __mptcp_check_fallback(msk); 1194 } 1195 1196 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1197 { 1198 if (__mptcp_check_fallback(msk)) { 1199 pr_debug("TCP fallback already done (msk=%p)\n", msk); 1200 return; 1201 } 1202 if (WARN_ON_ONCE(!READ_ONCE(msk->allow_infinite_fallback))) 1203 return; 1204 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1205 } 1206 1207 static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk) 1208 { 1209 struct sock *ssk = READ_ONCE(msk->first); 1210 1211 return ssk && ((1 << inet_sk_state_load(ssk)) & 1212 (TCPF_ESTABLISHED | TCPF_SYN_SENT | 1213 TCPF_SYN_RECV | TCPF_LISTEN)); 1214 } 1215 1216 static inline void mptcp_do_fallback(struct sock *ssk) 1217 { 1218 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1219 struct sock *sk = subflow->conn; 1220 struct mptcp_sock *msk; 1221 1222 msk = mptcp_sk(sk); 1223 __mptcp_do_fallback(msk); 1224 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1225 gfp_t saved_allocation = ssk->sk_allocation; 1226 1227 /* we are in a atomic (BH) scope, override ssk default for data 1228 * fin allocation 1229 */ 1230 ssk->sk_allocation = GFP_ATOMIC; 1231 ssk->sk_shutdown |= SEND_SHUTDOWN; 1232 tcp_shutdown(ssk, SEND_SHUTDOWN); 1233 ssk->sk_allocation = saved_allocation; 1234 } 1235 } 1236 1237 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)\n", __func__, a) 1238 1239 static inline void mptcp_subflow_early_fallback(struct mptcp_sock *msk, 1240 struct mptcp_subflow_context *subflow) 1241 { 1242 pr_fallback(msk); 1243 subflow->request_mptcp = 0; 1244 __mptcp_do_fallback(msk); 1245 } 1246 1247 static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 1248 { 1249 struct mptcp_ext *mpext; 1250 1251 mpext = skb ? mptcp_get_ext(skb) : NULL; 1252 if (mpext && mpext->infinite_map) 1253 return true; 1254 1255 return false; 1256 } 1257 1258 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 1259 { 1260 return (subflow->request_mptcp || subflow->request_join); 1261 } 1262 1263 static inline bool subflow_simultaneous_connect(struct sock *sk) 1264 { 1265 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1266 1267 return (1 << sk->sk_state) & 1268 (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING) && 1269 is_active_ssk(subflow) && 1270 !subflow->conn_finished; 1271 } 1272 1273 #ifdef CONFIG_SYN_COOKIES 1274 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1275 struct sk_buff *skb); 1276 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1277 struct sk_buff *skb); 1278 void __init mptcp_join_cookie_init(void); 1279 #else 1280 static inline void 1281 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1282 struct sk_buff *skb) {} 1283 static inline bool 1284 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1285 struct sk_buff *skb) 1286 { 1287 return false; 1288 } 1289 1290 static inline void mptcp_join_cookie_init(void) {} 1291 #endif 1292 1293 #endif /* __MPTCP_PROTOCOL_H */ 1294