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 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_local { 240 struct mptcp_addr_info addr; 241 u8 flags; 242 int ifindex; 243 }; 244 245 struct mptcp_pm_addr_entry { 246 struct list_head list; 247 struct mptcp_addr_info addr; 248 u8 flags; 249 int ifindex; 250 struct socket *lsk; 251 }; 252 253 struct mptcp_data_frag { 254 struct list_head list; 255 u64 data_seq; 256 u16 data_len; 257 u16 offset; 258 u16 overhead; 259 u16 already_sent; 260 struct page *page; 261 }; 262 263 /* MPTCP connection sock */ 264 struct mptcp_sock { 265 /* inet_connection_sock must be the first member */ 266 struct inet_connection_sock sk; 267 u64 local_key; /* protected by the first subflow socket lock 268 * lockless access read 269 */ 270 u64 remote_key; /* same as above */ 271 u64 write_seq; 272 u64 bytes_sent; 273 u64 snd_nxt; 274 u64 bytes_received; 275 u64 ack_seq; 276 atomic64_t rcv_wnd_sent; 277 u64 rcv_data_fin_seq; 278 u64 bytes_retrans; 279 u64 bytes_consumed; 280 int rmem_fwd_alloc; 281 int snd_burst; 282 int old_wspace; 283 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 284 * recovery related fields are under data_lock 285 * protection 286 */ 287 u64 bytes_acked; 288 u64 snd_una; 289 u64 wnd_end; 290 u32 last_data_sent; 291 u32 last_data_recv; 292 u32 last_ack_recv; 293 unsigned long timer_ival; 294 u32 token; 295 int rmem_released; 296 unsigned long flags; 297 unsigned long cb_flags; 298 bool recovery; /* closing subflow write queue reinjected */ 299 bool can_ack; 300 bool fully_established; 301 bool rcv_data_fin; 302 bool snd_data_fin_enable; 303 bool rcv_fastclose; 304 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 305 bool csum_enabled; 306 bool allow_infinite_fallback; 307 u8 pending_state; /* A subflow asked to set this sk_state, 308 * protected by the msk data lock 309 */ 310 u8 mpc_endpoint_id; 311 u8 recvmsg_inq:1, 312 cork:1, 313 nodelay:1, 314 fastopening:1, 315 in_accept_queue:1, 316 free_first:1, 317 rcvspace_init:1; 318 u32 notsent_lowat; 319 int keepalive_cnt; 320 int keepalive_idle; 321 int keepalive_intvl; 322 struct work_struct work; 323 struct sk_buff *ooo_last_skb; 324 struct rb_root out_of_order_queue; 325 struct sk_buff_head receive_queue; 326 struct list_head conn_list; 327 struct list_head rtx_queue; 328 struct mptcp_data_frag *first_pending; 329 struct list_head join_list; 330 struct sock *first; /* The mptcp ops can safely dereference, using suitable 331 * ONCE annotation, the subflow outside the socket 332 * lock as such sock is freed after close(). 333 */ 334 struct mptcp_pm_data pm; 335 struct mptcp_sched_ops *sched; 336 struct { 337 u32 space; /* bytes copied in last measurement window */ 338 u32 copied; /* bytes copied in this measurement window */ 339 u64 time; /* start time of measurement window */ 340 u64 rtt_us; /* last maximum rtt of subflows */ 341 } rcvq_space; 342 u8 scaling_ratio; 343 344 u32 subflow_id; 345 u32 setsockopt_seq; 346 char ca_name[TCP_CA_NAME_MAX]; 347 }; 348 349 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 350 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 351 352 #define mptcp_for_each_subflow(__msk, __subflow) \ 353 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 354 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 355 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 356 357 extern struct genl_family mptcp_genl_family; 358 359 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 360 { 361 sock_owned_by_me((const struct sock *)msk); 362 } 363 364 #ifdef CONFIG_DEBUG_NET 365 /* MPTCP-specific: we might (indirectly) call this helper with the wrong sk */ 366 #undef tcp_sk 367 #define tcp_sk(ptr) ({ \ 368 typeof(ptr) _ptr = (ptr); \ 369 WARN_ON(_ptr->sk_protocol != IPPROTO_TCP); \ 370 container_of_const(_ptr, struct tcp_sock, inet_conn.icsk_inet.sk); \ 371 }) 372 #define mptcp_sk(ptr) ({ \ 373 typeof(ptr) _ptr = (ptr); \ 374 WARN_ON(_ptr->sk_protocol != IPPROTO_MPTCP); \ 375 container_of_const(_ptr, struct mptcp_sock, sk.icsk_inet.sk); \ 376 }) 377 378 #else /* !CONFIG_DEBUG_NET */ 379 #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 380 #endif 381 382 /* the msk socket don't use the backlog, also account for the bulk 383 * free memory 384 */ 385 static inline int __mptcp_rmem(const struct sock *sk) 386 { 387 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 388 } 389 390 static inline int mptcp_win_from_space(const struct sock *sk, int space) 391 { 392 return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); 393 } 394 395 static inline int mptcp_space_from_win(const struct sock *sk, int win) 396 { 397 return __tcp_space_from_win(mptcp_sk(sk)->scaling_ratio, win); 398 } 399 400 static inline int __mptcp_space(const struct sock *sk) 401 { 402 return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 403 } 404 405 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 406 { 407 const struct mptcp_sock *msk = mptcp_sk(sk); 408 409 return READ_ONCE(msk->first_pending); 410 } 411 412 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 413 { 414 struct mptcp_sock *msk = mptcp_sk(sk); 415 struct mptcp_data_frag *cur; 416 417 cur = msk->first_pending; 418 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 419 list_next_entry(cur, list); 420 } 421 422 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 423 { 424 const struct mptcp_sock *msk = mptcp_sk(sk); 425 426 if (!msk->first_pending) 427 return NULL; 428 429 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 430 return NULL; 431 432 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 433 } 434 435 static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 436 { 437 struct mptcp_sock *msk = mptcp_sk(sk); 438 439 if (msk->snd_una == msk->snd_nxt) 440 return NULL; 441 442 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 443 } 444 445 struct csum_pseudo_header { 446 __be64 data_seq; 447 __be32 subflow_seq; 448 __be16 data_len; 449 __sum16 csum; 450 }; 451 452 struct mptcp_subflow_request_sock { 453 struct tcp_request_sock sk; 454 u16 mp_capable : 1, 455 mp_join : 1, 456 backup : 1, 457 request_bkup : 1, 458 csum_reqd : 1, 459 allow_join_id0 : 1; 460 u8 local_id; 461 u8 remote_id; 462 u64 local_key; 463 u64 idsn; 464 u32 token; 465 u32 ssn_offset; 466 u64 thmac; 467 u32 local_nonce; 468 u32 remote_nonce; 469 struct mptcp_sock *msk; 470 struct hlist_nulls_node token_node; 471 }; 472 473 static inline struct mptcp_subflow_request_sock * 474 mptcp_subflow_rsk(const struct request_sock *rsk) 475 { 476 return (struct mptcp_subflow_request_sock *)rsk; 477 } 478 479 struct mptcp_delegated_action { 480 struct napi_struct napi; 481 struct list_head head; 482 }; 483 484 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 485 486 #define MPTCP_DELEGATE_SCHEDULED 0 487 #define MPTCP_DELEGATE_SEND 1 488 #define MPTCP_DELEGATE_ACK 2 489 #define MPTCP_DELEGATE_SNDBUF 3 490 491 #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 492 /* MPTCP subflow context */ 493 struct mptcp_subflow_context { 494 struct list_head node;/* conn_list of subflows */ 495 496 struct_group(reset, 497 498 unsigned long avg_pacing_rate; /* protected by msk socket lock */ 499 u64 local_key; 500 u64 remote_key; 501 u64 idsn; 502 u64 map_seq; 503 u32 snd_isn; 504 u32 token; 505 u32 rel_write_seq; 506 u32 map_subflow_seq; 507 u32 ssn_offset; 508 u32 map_data_len; 509 __wsum map_data_csum; 510 u32 map_csum_len; 511 u32 request_mptcp : 1, /* send MP_CAPABLE */ 512 request_join : 1, /* send MP_JOIN */ 513 request_bkup : 1, 514 mp_capable : 1, /* remote is MPTCP capable */ 515 mp_join : 1, /* remote is JOINing */ 516 fully_established : 1, /* path validated */ 517 pm_notified : 1, /* PM hook called for established status */ 518 conn_finished : 1, 519 map_valid : 1, 520 map_csum_reqd : 1, 521 map_data_fin : 1, 522 mpc_map : 1, 523 backup : 1, 524 send_mp_prio : 1, 525 send_mp_fail : 1, 526 send_fastclose : 1, 527 send_infinite_map : 1, 528 remote_key_valid : 1, /* received the peer key from */ 529 disposable : 1, /* ctx can be free at ulp release time */ 530 stale : 1, /* unable to snd/rcv data, do not use for xmit */ 531 valid_csum_seen : 1, /* at least one csum validated */ 532 is_mptfo : 1, /* subflow is doing TFO */ 533 close_event_done : 1, /* has done the post-closed part */ 534 mpc_drop : 1, /* the MPC option has been dropped in a rtx */ 535 __unused : 8; 536 bool data_avail; 537 bool scheduled; 538 bool pm_listener; /* a listener managed by the kernel PM? */ 539 u32 remote_nonce; 540 u64 thmac; 541 u32 local_nonce; 542 u32 remote_token; 543 union { 544 u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 545 u64 iasn; /* initial ack sequence number, MPC subflows only */ 546 }; 547 s16 local_id; /* if negative not initialized yet */ 548 u8 remote_id; 549 u8 reset_seen:1; 550 u8 reset_transient:1; 551 u8 reset_reason:4; 552 u8 stale_count; 553 554 u32 subflow_id; 555 556 long delegated_status; 557 unsigned long fail_tout; 558 559 ); 560 561 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 562 563 u32 setsockopt_seq; 564 u32 stale_rcv_tstamp; 565 int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, 566 * protected by the msk socket lock 567 */ 568 569 struct sock *tcp_sock; /* tcp sk backpointer */ 570 struct sock *conn; /* parent mptcp_sock */ 571 const struct inet_connection_sock_af_ops *icsk_af_ops; 572 void (*tcp_state_change)(struct sock *sk); 573 void (*tcp_error_report)(struct sock *sk); 574 575 struct rcu_head rcu; 576 }; 577 578 static inline struct mptcp_subflow_context * 579 mptcp_subflow_ctx(const struct sock *sk) 580 { 581 const struct inet_connection_sock *icsk = inet_csk(sk); 582 583 /* Use RCU on icsk_ulp_data only for sock diag code */ 584 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 585 } 586 587 static inline struct sock * 588 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 589 { 590 return subflow->tcp_sock; 591 } 592 593 static inline void 594 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 595 { 596 memset(&subflow->reset, 0, sizeof(subflow->reset)); 597 subflow->request_mptcp = 1; 598 WRITE_ONCE(subflow->local_id, -1); 599 } 600 601 /* Convert reset reasons in MPTCP to enum sk_rst_reason type */ 602 static inline enum sk_rst_reason 603 sk_rst_convert_mptcp_reason(u32 reason) 604 { 605 switch (reason) { 606 case MPTCP_RST_EUNSPEC: 607 return SK_RST_REASON_MPTCP_RST_EUNSPEC; 608 case MPTCP_RST_EMPTCP: 609 return SK_RST_REASON_MPTCP_RST_EMPTCP; 610 case MPTCP_RST_ERESOURCE: 611 return SK_RST_REASON_MPTCP_RST_ERESOURCE; 612 case MPTCP_RST_EPROHIBIT: 613 return SK_RST_REASON_MPTCP_RST_EPROHIBIT; 614 case MPTCP_RST_EWQ2BIG: 615 return SK_RST_REASON_MPTCP_RST_EWQ2BIG; 616 case MPTCP_RST_EBADPERF: 617 return SK_RST_REASON_MPTCP_RST_EBADPERF; 618 case MPTCP_RST_EMIDDLEBOX: 619 return SK_RST_REASON_MPTCP_RST_EMIDDLEBOX; 620 default: 621 /* It should not happen, or else errors may occur 622 * in MPTCP layer 623 */ 624 return SK_RST_REASON_ERROR; 625 } 626 } 627 628 static inline void 629 mptcp_send_active_reset_reason(struct sock *sk) 630 { 631 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 632 enum sk_rst_reason reason; 633 634 reason = sk_rst_convert_mptcp_reason(subflow->reset_reason); 635 tcp_send_active_reset(sk, GFP_ATOMIC, reason); 636 } 637 638 static inline u64 639 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 640 { 641 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 642 subflow->ssn_offset - 643 subflow->map_subflow_seq; 644 } 645 646 static inline u64 647 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 648 { 649 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 650 } 651 652 void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 653 654 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 655 { 656 long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 657 struct mptcp_delegated_action *delegated; 658 bool schedule; 659 660 /* the caller held the subflow bh socket lock */ 661 lockdep_assert_in_softirq(); 662 663 /* The implied barrier pairs with tcp_release_cb_override() 664 * mptcp_napi_poll(), and ensures the below list check sees list 665 * updates done prior to delegated status bits changes 666 */ 667 old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 668 if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 669 if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 670 return; 671 672 delegated = this_cpu_ptr(&mptcp_delegated_actions); 673 schedule = list_empty(&delegated->head); 674 list_add_tail(&subflow->delegated_node, &delegated->head); 675 sock_hold(mptcp_subflow_tcp_sock(subflow)); 676 if (schedule) 677 napi_schedule(&delegated->napi); 678 } 679 } 680 681 static inline struct mptcp_subflow_context * 682 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 683 { 684 struct mptcp_subflow_context *ret; 685 686 if (list_empty(&delegated->head)) 687 return NULL; 688 689 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 690 list_del_init(&ret->delegated_node); 691 return ret; 692 } 693 694 int mptcp_is_enabled(const struct net *net); 695 unsigned int mptcp_get_add_addr_timeout(const struct net *net); 696 int mptcp_is_checksum_enabled(const struct net *net); 697 int mptcp_allow_join_id0(const struct net *net); 698 unsigned int mptcp_stale_loss_cnt(const struct net *net); 699 unsigned int mptcp_close_timeout(const struct sock *sk); 700 int mptcp_get_pm_type(const struct net *net); 701 const char *mptcp_get_scheduler(const struct net *net); 702 703 void mptcp_active_disable(struct sock *sk); 704 bool mptcp_active_should_disable(struct sock *ssk); 705 void mptcp_active_enable(struct sock *sk); 706 707 void mptcp_get_available_schedulers(char *buf, size_t maxlen); 708 void __mptcp_subflow_fully_established(struct mptcp_sock *msk, 709 struct mptcp_subflow_context *subflow, 710 const struct mptcp_options_received *mp_opt); 711 bool __mptcp_retransmit_pending_data(struct sock *sk); 712 void mptcp_check_and_set_pending(struct sock *sk); 713 void __mptcp_push_pending(struct sock *sk, unsigned int flags); 714 bool mptcp_subflow_data_available(struct sock *sk); 715 void __init mptcp_subflow_init(void); 716 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 717 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 718 struct mptcp_subflow_context *subflow); 719 void __mptcp_subflow_send_ack(struct sock *ssk); 720 void mptcp_subflow_reset(struct sock *ssk); 721 void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 722 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 723 struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 724 bool __mptcp_close(struct sock *sk, long timeout); 725 void mptcp_cancel_work(struct sock *sk); 726 void __mptcp_unaccepted_force_close(struct sock *sk); 727 void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 728 void mptcp_set_state(struct sock *sk, int state); 729 730 bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 731 const struct mptcp_addr_info *b, bool use_port); 732 void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 733 734 /* called with sk socket lock held */ 735 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_pm_local *local, 736 const struct mptcp_addr_info *remote); 737 int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 738 struct socket **new_sock); 739 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 740 struct sockaddr_storage *addr, 741 unsigned short family); 742 struct mptcp_sched_ops *mptcp_sched_find(const char *name); 743 int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 744 void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 745 void mptcp_sched_init(void); 746 int mptcp_init_sched(struct mptcp_sock *msk, 747 struct mptcp_sched_ops *sched); 748 void mptcp_release_sched(struct mptcp_sock *msk); 749 void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 750 bool scheduled); 751 struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 752 struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 753 int mptcp_sched_get_send(struct mptcp_sock *msk); 754 int mptcp_sched_get_retrans(struct mptcp_sock *msk); 755 756 static inline u64 mptcp_data_avail(const struct mptcp_sock *msk) 757 { 758 return READ_ONCE(msk->bytes_received) - READ_ONCE(msk->bytes_consumed); 759 } 760 761 static inline bool mptcp_epollin_ready(const struct sock *sk) 762 { 763 /* mptcp doesn't have to deal with small skbs in the receive queue, 764 * at it can always coalesce them 765 */ 766 return (mptcp_data_avail(mptcp_sk(sk)) >= sk->sk_rcvlowat) || 767 (mem_cgroup_sockets_enabled && sk->sk_memcg && 768 mem_cgroup_under_socket_pressure(sk->sk_memcg)) || 769 READ_ONCE(tcp_memory_pressure); 770 } 771 772 int mptcp_set_rcvlowat(struct sock *sk, int val); 773 774 static inline bool __tcp_can_send(const struct sock *ssk) 775 { 776 /* only send if our side has not closed yet */ 777 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 778 } 779 780 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 781 { 782 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 783 if (subflow->request_join && !subflow->fully_established) 784 return false; 785 786 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 787 } 788 789 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 790 791 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 792 793 void mptcp_subflow_drop_ctx(struct sock *ssk); 794 795 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 796 struct mptcp_subflow_context *ctx) 797 { 798 sk->sk_data_ready = sock_def_readable; 799 sk->sk_state_change = ctx->tcp_state_change; 800 sk->sk_write_space = sk_stream_write_space; 801 sk->sk_error_report = ctx->tcp_error_report; 802 803 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 804 } 805 806 void __init mptcp_proto_init(void); 807 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 808 int __init mptcp_proto_v6_init(void); 809 #endif 810 811 struct sock *mptcp_sk_clone_init(const struct sock *sk, 812 const struct mptcp_options_received *mp_opt, 813 struct sock *ssk, 814 struct request_sock *req); 815 void mptcp_get_options(const struct sk_buff *skb, 816 struct mptcp_options_received *mp_opt); 817 818 void mptcp_finish_connect(struct sock *sk); 819 void __mptcp_sync_state(struct sock *sk, int state); 820 void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 821 822 static inline void mptcp_stop_tout_timer(struct sock *sk) 823 { 824 if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 825 return; 826 827 sk_stop_timer(sk, &sk->sk_timer); 828 inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 829 } 830 831 static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 832 { 833 /* avoid 0 timestamp, as that means no close timeout */ 834 inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 835 } 836 837 static inline void mptcp_start_tout_timer(struct sock *sk) 838 { 839 mptcp_set_close_tout(sk, tcp_jiffies32); 840 mptcp_reset_tout_timer(mptcp_sk(sk), 0); 841 } 842 843 static inline bool mptcp_is_fully_established(struct sock *sk) 844 { 845 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 846 READ_ONCE(mptcp_sk(sk)->fully_established); 847 } 848 849 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 850 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 851 bool mptcp_finish_join(struct sock *sk); 852 bool mptcp_schedule_work(struct sock *sk); 853 int mptcp_setsockopt(struct sock *sk, int level, int optname, 854 sockptr_t optval, unsigned int optlen); 855 int mptcp_getsockopt(struct sock *sk, int level, int optname, 856 char __user *optval, int __user *option); 857 858 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 859 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 860 { 861 if (use_64bit) 862 return cur_seq; 863 864 return __mptcp_expand_seq(old_seq, cur_seq); 865 } 866 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 867 void __mptcp_data_acked(struct sock *sk); 868 void __mptcp_error_report(struct sock *sk); 869 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 870 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 871 { 872 return READ_ONCE(msk->snd_data_fin_enable) && 873 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 874 } 875 876 static inline u32 mptcp_notsent_lowat(const struct sock *sk) 877 { 878 struct net *net = sock_net(sk); 879 u32 val; 880 881 val = READ_ONCE(mptcp_sk(sk)->notsent_lowat); 882 return val ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat); 883 } 884 885 static inline bool mptcp_stream_memory_free(const struct sock *sk, int wake) 886 { 887 const struct mptcp_sock *msk = mptcp_sk(sk); 888 u32 notsent_bytes; 889 890 notsent_bytes = READ_ONCE(msk->write_seq) - READ_ONCE(msk->snd_nxt); 891 return (notsent_bytes << wake) < mptcp_notsent_lowat(sk); 892 } 893 894 static inline bool __mptcp_stream_is_writeable(const struct sock *sk, int wake) 895 { 896 return mptcp_stream_memory_free(sk, wake) && 897 __sk_stream_is_writeable(sk, wake); 898 } 899 900 static inline void mptcp_write_space(struct sock *sk) 901 { 902 /* pairs with memory barrier in mptcp_poll */ 903 smp_mb(); 904 if (mptcp_stream_memory_free(sk, 1)) 905 sk_stream_write_space(sk); 906 } 907 908 static inline void __mptcp_sync_sndbuf(struct sock *sk) 909 { 910 struct mptcp_subflow_context *subflow; 911 int ssk_sndbuf, new_sndbuf; 912 913 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 914 return; 915 916 new_sndbuf = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_wmem[0]); 917 mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 918 ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf); 919 920 subflow->cached_sndbuf = ssk_sndbuf; 921 new_sndbuf += ssk_sndbuf; 922 } 923 924 /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */ 925 WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); 926 mptcp_write_space(sk); 927 } 928 929 /* The called held both the msk socket and the subflow socket locks, 930 * possibly under BH 931 */ 932 static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 933 { 934 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 935 936 if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) 937 __mptcp_sync_sndbuf(sk); 938 } 939 940 /* the caller held only the subflow socket lock, either in process or 941 * BH context. Additionally this can be called under the msk data lock, 942 * so we can't acquire such lock here: let the delegate action acquires 943 * the needed locks in suitable order. 944 */ 945 static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 946 { 947 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 948 949 if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) 950 return; 951 952 local_bh_disable(); 953 mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); 954 local_bh_enable(); 955 } 956 957 void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 958 959 #define MPTCP_TOKEN_MAX_RETRIES 4 960 961 void __init mptcp_token_init(void); 962 static inline void mptcp_token_init_request(struct request_sock *req) 963 { 964 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 965 } 966 967 int mptcp_token_new_request(struct request_sock *req); 968 void mptcp_token_destroy_request(struct request_sock *req); 969 int mptcp_token_new_connect(struct sock *ssk); 970 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 971 struct mptcp_sock *msk); 972 bool mptcp_token_exists(u32 token); 973 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 974 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 975 long *s_num); 976 void mptcp_token_destroy(struct mptcp_sock *msk); 977 978 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 979 980 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 981 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 982 983 void __init mptcp_pm_init(void); 984 void mptcp_pm_data_init(struct mptcp_sock *msk); 985 void mptcp_pm_data_reset(struct mptcp_sock *msk); 986 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 987 struct mptcp_addr_info *addr); 988 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 989 bool require_family, 990 struct mptcp_pm_addr_entry *entry); 991 bool mptcp_pm_addr_families_match(const struct sock *sk, 992 const struct mptcp_addr_info *loc, 993 const struct mptcp_addr_info *rem); 994 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 995 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 996 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 997 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 998 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 999 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 1000 void mptcp_pm_subflow_established(struct mptcp_sock *msk); 1001 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 1002 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, 1003 const struct mptcp_subflow_context *subflow); 1004 void mptcp_pm_add_addr_received(const struct sock *ssk, 1005 const struct mptcp_addr_info *addr); 1006 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 1007 const struct mptcp_addr_info *addr); 1008 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 1009 bool mptcp_pm_nl_is_init_remote_addr(struct mptcp_sock *msk, 1010 const struct mptcp_addr_info *remote); 1011 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 1012 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 1013 const struct mptcp_rm_list *rm_list); 1014 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 1015 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 1016 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 1017 struct mptcp_addr_info *addr, 1018 struct mptcp_addr_info *rem, 1019 u8 bkup); 1020 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 1021 const struct mptcp_addr_info *addr); 1022 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 1023 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 1024 struct mptcp_pm_add_entry * 1025 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 1026 const struct mptcp_addr_info *addr, bool check_id); 1027 struct mptcp_pm_add_entry * 1028 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 1029 const struct mptcp_addr_info *addr); 1030 int mptcp_pm_set_flags(struct sk_buff *skb, struct genl_info *info); 1031 int mptcp_pm_nl_set_flags(struct sk_buff *skb, struct genl_info *info); 1032 int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info); 1033 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 1034 const struct mptcp_addr_info *addr, 1035 bool echo); 1036 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 1037 void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); 1038 1039 void mptcp_free_local_addr_list(struct mptcp_sock *msk); 1040 1041 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 1042 const struct sock *ssk, gfp_t gfp); 1043 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 1044 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 1045 void mptcp_event_pm_listener(const struct sock *ssk, 1046 enum mptcp_event_type event); 1047 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 1048 1049 void __mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 1050 const struct mptcp_options_received *mp_opt); 1051 void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 1052 struct request_sock *req); 1053 int mptcp_nl_fill_addr(struct sk_buff *skb, 1054 struct mptcp_pm_addr_entry *entry); 1055 1056 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 1057 { 1058 return READ_ONCE(msk->pm.addr_signal) & 1059 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 1060 } 1061 1062 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 1063 { 1064 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 1065 } 1066 1067 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 1068 { 1069 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 1070 } 1071 1072 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 1073 { 1074 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 1075 } 1076 1077 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 1078 { 1079 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 1080 } 1081 1082 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 1083 { 1084 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 1085 } 1086 1087 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 1088 { 1089 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 1090 1091 if (family == AF_INET6) 1092 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 1093 if (!echo) 1094 len += MPTCPOPT_THMAC_LEN; 1095 /* account for 2 trailing 'nop' options */ 1096 if (port) 1097 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 1098 1099 return len; 1100 } 1101 1102 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 1103 { 1104 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 1105 return -EINVAL; 1106 1107 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 1108 } 1109 1110 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 1111 unsigned int opt_size, unsigned int remaining, 1112 struct mptcp_addr_info *addr, bool *echo, 1113 bool *drop_other_suboptions); 1114 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 1115 struct mptcp_rm_list *rm_list); 1116 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 1117 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1118 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1119 bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc); 1120 bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1121 bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1122 int mptcp_pm_dump_addr(struct sk_buff *msg, struct netlink_callback *cb); 1123 int mptcp_pm_nl_dump_addr(struct sk_buff *msg, 1124 struct netlink_callback *cb); 1125 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, 1126 struct netlink_callback *cb); 1127 int mptcp_pm_get_addr(struct sk_buff *skb, struct genl_info *info); 1128 int mptcp_pm_nl_get_addr(struct sk_buff *skb, struct genl_info *info); 1129 int mptcp_userspace_pm_get_addr(struct sk_buff *skb, 1130 struct genl_info *info); 1131 1132 static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow) 1133 { 1134 int local_id = READ_ONCE(subflow->local_id); 1135 1136 if (local_id < 0) 1137 return 0; 1138 return local_id; 1139 } 1140 1141 void __init mptcp_pm_nl_init(void); 1142 void mptcp_pm_nl_work(struct mptcp_sock *msk); 1143 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 1144 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 1145 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 1146 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 1147 1148 /* called under PM lock */ 1149 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 1150 { 1151 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 1152 WRITE_ONCE(msk->pm.accept_subflow, true); 1153 } 1154 1155 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 1156 { 1157 spin_lock_bh(&msk->pm.lock); 1158 __mptcp_pm_close_subflow(msk); 1159 spin_unlock_bh(&msk->pm.lock); 1160 } 1161 1162 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 1163 1164 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 1165 { 1166 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 1167 } 1168 1169 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 1170 1171 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 1172 { 1173 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1174 } 1175 1176 static inline bool mptcp_check_fallback(const struct sock *sk) 1177 { 1178 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1179 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1180 1181 return __mptcp_check_fallback(msk); 1182 } 1183 1184 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1185 { 1186 if (__mptcp_check_fallback(msk)) { 1187 pr_debug("TCP fallback already done (msk=%p)\n", msk); 1188 return; 1189 } 1190 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1191 } 1192 1193 static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk) 1194 { 1195 struct sock *ssk = READ_ONCE(msk->first); 1196 1197 return ssk && ((1 << inet_sk_state_load(ssk)) & 1198 (TCPF_ESTABLISHED | TCPF_SYN_SENT | 1199 TCPF_SYN_RECV | TCPF_LISTEN)); 1200 } 1201 1202 static inline void mptcp_do_fallback(struct sock *ssk) 1203 { 1204 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1205 struct sock *sk = subflow->conn; 1206 struct mptcp_sock *msk; 1207 1208 msk = mptcp_sk(sk); 1209 __mptcp_do_fallback(msk); 1210 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1211 gfp_t saved_allocation = ssk->sk_allocation; 1212 1213 /* we are in a atomic (BH) scope, override ssk default for data 1214 * fin allocation 1215 */ 1216 ssk->sk_allocation = GFP_ATOMIC; 1217 ssk->sk_shutdown |= SEND_SHUTDOWN; 1218 tcp_shutdown(ssk, SEND_SHUTDOWN); 1219 ssk->sk_allocation = saved_allocation; 1220 } 1221 } 1222 1223 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)\n", __func__, a) 1224 1225 static inline void mptcp_subflow_early_fallback(struct mptcp_sock *msk, 1226 struct mptcp_subflow_context *subflow) 1227 { 1228 pr_fallback(msk); 1229 subflow->request_mptcp = 0; 1230 __mptcp_do_fallback(msk); 1231 } 1232 1233 static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 1234 { 1235 struct mptcp_ext *mpext; 1236 1237 mpext = skb ? mptcp_get_ext(skb) : NULL; 1238 if (mpext && mpext->infinite_map) 1239 return true; 1240 1241 return false; 1242 } 1243 1244 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 1245 { 1246 return (subflow->request_mptcp || subflow->request_join); 1247 } 1248 1249 static inline bool subflow_simultaneous_connect(struct sock *sk) 1250 { 1251 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1252 1253 return (1 << sk->sk_state) & 1254 (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING) && 1255 is_active_ssk(subflow) && 1256 !subflow->conn_finished; 1257 } 1258 1259 #ifdef CONFIG_SYN_COOKIES 1260 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1261 struct sk_buff *skb); 1262 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1263 struct sk_buff *skb); 1264 void __init mptcp_join_cookie_init(void); 1265 #else 1266 static inline void 1267 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1268 struct sk_buff *skb) {} 1269 static inline bool 1270 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1271 struct sk_buff *skb) 1272 { 1273 return false; 1274 } 1275 1276 static inline void mptcp_join_cookie_init(void) {} 1277 #endif 1278 1279 #endif /* __MPTCP_PROTOCOL_H */ 1280