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_addr_entry { 240 struct list_head list; 241 struct mptcp_addr_info addr; 242 u8 flags; 243 int ifindex; 244 struct socket *lsk; 245 }; 246 247 struct mptcp_data_frag { 248 struct list_head list; 249 u64 data_seq; 250 u16 data_len; 251 u16 offset; 252 u16 overhead; 253 u16 already_sent; 254 struct page *page; 255 }; 256 257 /* MPTCP connection sock */ 258 struct mptcp_sock { 259 /* inet_connection_sock must be the first member */ 260 struct inet_connection_sock sk; 261 u64 local_key; /* protected by the first subflow socket lock 262 * lockless access read 263 */ 264 u64 remote_key; /* same as above */ 265 u64 write_seq; 266 u64 bytes_sent; 267 u64 snd_nxt; 268 u64 bytes_received; 269 u64 ack_seq; 270 atomic64_t rcv_wnd_sent; 271 u64 rcv_data_fin_seq; 272 u64 bytes_retrans; 273 u64 bytes_consumed; 274 int rmem_fwd_alloc; 275 int snd_burst; 276 int old_wspace; 277 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 278 * recovery related fields are under data_lock 279 * protection 280 */ 281 u64 bytes_acked; 282 u64 snd_una; 283 u64 wnd_end; 284 u32 last_data_sent; 285 u32 last_data_recv; 286 u32 last_ack_recv; 287 unsigned long timer_ival; 288 u32 token; 289 int rmem_released; 290 unsigned long flags; 291 unsigned long cb_flags; 292 bool recovery; /* closing subflow write queue reinjected */ 293 bool can_ack; 294 bool fully_established; 295 bool rcv_data_fin; 296 bool snd_data_fin_enable; 297 bool rcv_fastclose; 298 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 299 bool csum_enabled; 300 bool allow_infinite_fallback; 301 u8 pending_state; /* A subflow asked to set this sk_state, 302 * protected by the msk data lock 303 */ 304 u8 mpc_endpoint_id; 305 u8 recvmsg_inq:1, 306 cork:1, 307 nodelay:1, 308 fastopening:1, 309 in_accept_queue:1, 310 free_first:1, 311 rcvspace_init:1; 312 u32 notsent_lowat; 313 int keepalive_cnt; 314 int keepalive_idle; 315 int keepalive_intvl; 316 struct work_struct work; 317 struct sk_buff *ooo_last_skb; 318 struct rb_root out_of_order_queue; 319 struct sk_buff_head receive_queue; 320 struct list_head conn_list; 321 struct list_head rtx_queue; 322 struct mptcp_data_frag *first_pending; 323 struct list_head join_list; 324 struct sock *first; /* The mptcp ops can safely dereference, using suitable 325 * ONCE annotation, the subflow outside the socket 326 * lock as such sock is freed after close(). 327 */ 328 struct mptcp_pm_data pm; 329 struct mptcp_sched_ops *sched; 330 struct { 331 u32 space; /* bytes copied in last measurement window */ 332 u32 copied; /* bytes copied in this measurement window */ 333 u64 time; /* start time of measurement window */ 334 u64 rtt_us; /* last maximum rtt of subflows */ 335 } rcvq_space; 336 u8 scaling_ratio; 337 338 u32 subflow_id; 339 u32 setsockopt_seq; 340 char ca_name[TCP_CA_NAME_MAX]; 341 }; 342 343 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 344 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 345 346 #define mptcp_for_each_subflow(__msk, __subflow) \ 347 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 348 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 349 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 350 351 extern struct genl_family mptcp_genl_family; 352 353 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 354 { 355 sock_owned_by_me((const struct sock *)msk); 356 } 357 358 #ifdef CONFIG_DEBUG_NET 359 /* MPTCP-specific: we might (indirectly) call this helper with the wrong sk */ 360 #undef tcp_sk 361 #define tcp_sk(ptr) ({ \ 362 typeof(ptr) _ptr = (ptr); \ 363 WARN_ON(_ptr->sk_protocol != IPPROTO_TCP); \ 364 container_of_const(_ptr, struct tcp_sock, inet_conn.icsk_inet.sk); \ 365 }) 366 #define mptcp_sk(ptr) ({ \ 367 typeof(ptr) _ptr = (ptr); \ 368 WARN_ON(_ptr->sk_protocol != IPPROTO_MPTCP); \ 369 container_of_const(_ptr, struct mptcp_sock, sk.icsk_inet.sk); \ 370 }) 371 372 #else /* !CONFIG_DEBUG_NET */ 373 #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 374 #endif 375 376 /* the msk socket don't use the backlog, also account for the bulk 377 * free memory 378 */ 379 static inline int __mptcp_rmem(const struct sock *sk) 380 { 381 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 382 } 383 384 static inline int mptcp_win_from_space(const struct sock *sk, int space) 385 { 386 return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); 387 } 388 389 static inline int mptcp_space_from_win(const struct sock *sk, int win) 390 { 391 return __tcp_space_from_win(mptcp_sk(sk)->scaling_ratio, win); 392 } 393 394 static inline int __mptcp_space(const struct sock *sk) 395 { 396 return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 397 } 398 399 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 400 { 401 const struct mptcp_sock *msk = mptcp_sk(sk); 402 403 return READ_ONCE(msk->first_pending); 404 } 405 406 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 407 { 408 struct mptcp_sock *msk = mptcp_sk(sk); 409 struct mptcp_data_frag *cur; 410 411 cur = msk->first_pending; 412 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 413 list_next_entry(cur, list); 414 } 415 416 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 417 { 418 const struct mptcp_sock *msk = mptcp_sk(sk); 419 420 if (!msk->first_pending) 421 return NULL; 422 423 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 424 return NULL; 425 426 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 427 } 428 429 static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 430 { 431 struct mptcp_sock *msk = mptcp_sk(sk); 432 433 if (msk->snd_una == msk->snd_nxt) 434 return NULL; 435 436 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 437 } 438 439 struct csum_pseudo_header { 440 __be64 data_seq; 441 __be32 subflow_seq; 442 __be16 data_len; 443 __sum16 csum; 444 }; 445 446 struct mptcp_subflow_request_sock { 447 struct tcp_request_sock sk; 448 u16 mp_capable : 1, 449 mp_join : 1, 450 backup : 1, 451 request_bkup : 1, 452 csum_reqd : 1, 453 allow_join_id0 : 1; 454 u8 local_id; 455 u8 remote_id; 456 u64 local_key; 457 u64 idsn; 458 u32 token; 459 u32 ssn_offset; 460 u64 thmac; 461 u32 local_nonce; 462 u32 remote_nonce; 463 struct mptcp_sock *msk; 464 struct hlist_nulls_node token_node; 465 }; 466 467 static inline struct mptcp_subflow_request_sock * 468 mptcp_subflow_rsk(const struct request_sock *rsk) 469 { 470 return (struct mptcp_subflow_request_sock *)rsk; 471 } 472 473 struct mptcp_delegated_action { 474 struct napi_struct napi; 475 struct list_head head; 476 }; 477 478 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 479 480 #define MPTCP_DELEGATE_SCHEDULED 0 481 #define MPTCP_DELEGATE_SEND 1 482 #define MPTCP_DELEGATE_ACK 2 483 #define MPTCP_DELEGATE_SNDBUF 3 484 485 #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 486 /* MPTCP subflow context */ 487 struct mptcp_subflow_context { 488 struct list_head node;/* conn_list of subflows */ 489 490 struct_group(reset, 491 492 unsigned long avg_pacing_rate; /* protected by msk socket lock */ 493 u64 local_key; 494 u64 remote_key; 495 u64 idsn; 496 u64 map_seq; 497 u32 snd_isn; 498 u32 token; 499 u32 rel_write_seq; 500 u32 map_subflow_seq; 501 u32 ssn_offset; 502 u32 map_data_len; 503 __wsum map_data_csum; 504 u32 map_csum_len; 505 u32 request_mptcp : 1, /* send MP_CAPABLE */ 506 request_join : 1, /* send MP_JOIN */ 507 request_bkup : 1, 508 mp_capable : 1, /* remote is MPTCP capable */ 509 mp_join : 1, /* remote is JOINing */ 510 fully_established : 1, /* path validated */ 511 pm_notified : 1, /* PM hook called for established status */ 512 conn_finished : 1, 513 map_valid : 1, 514 map_csum_reqd : 1, 515 map_data_fin : 1, 516 mpc_map : 1, 517 backup : 1, 518 send_mp_prio : 1, 519 send_mp_fail : 1, 520 send_fastclose : 1, 521 send_infinite_map : 1, 522 remote_key_valid : 1, /* received the peer key from */ 523 disposable : 1, /* ctx can be free at ulp release time */ 524 stale : 1, /* unable to snd/rcv data, do not use for xmit */ 525 valid_csum_seen : 1, /* at least one csum validated */ 526 is_mptfo : 1, /* subflow is doing TFO */ 527 __unused : 10; 528 bool data_avail; 529 bool scheduled; 530 u32 remote_nonce; 531 u64 thmac; 532 u32 local_nonce; 533 u32 remote_token; 534 union { 535 u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 536 u64 iasn; /* initial ack sequence number, MPC subflows only */ 537 }; 538 s16 local_id; /* if negative not initialized yet */ 539 u8 remote_id; 540 u8 reset_seen:1; 541 u8 reset_transient:1; 542 u8 reset_reason:4; 543 u8 stale_count; 544 545 u32 subflow_id; 546 547 long delegated_status; 548 unsigned long fail_tout; 549 550 ); 551 552 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 553 554 u32 setsockopt_seq; 555 u32 stale_rcv_tstamp; 556 int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, 557 * protected by the msk socket lock 558 */ 559 560 struct sock *tcp_sock; /* tcp sk backpointer */ 561 struct sock *conn; /* parent mptcp_sock */ 562 const struct inet_connection_sock_af_ops *icsk_af_ops; 563 void (*tcp_state_change)(struct sock *sk); 564 void (*tcp_error_report)(struct sock *sk); 565 566 struct rcu_head rcu; 567 }; 568 569 static inline struct mptcp_subflow_context * 570 mptcp_subflow_ctx(const struct sock *sk) 571 { 572 const struct inet_connection_sock *icsk = inet_csk(sk); 573 574 /* Use RCU on icsk_ulp_data only for sock diag code */ 575 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 576 } 577 578 static inline struct sock * 579 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 580 { 581 return subflow->tcp_sock; 582 } 583 584 static inline void 585 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 586 { 587 memset(&subflow->reset, 0, sizeof(subflow->reset)); 588 subflow->request_mptcp = 1; 589 WRITE_ONCE(subflow->local_id, -1); 590 } 591 592 /* Convert reset reasons in MPTCP to enum sk_rst_reason type */ 593 static inline enum sk_rst_reason 594 sk_rst_convert_mptcp_reason(u32 reason) 595 { 596 switch (reason) { 597 case MPTCP_RST_EUNSPEC: 598 return SK_RST_REASON_MPTCP_RST_EUNSPEC; 599 case MPTCP_RST_EMPTCP: 600 return SK_RST_REASON_MPTCP_RST_EMPTCP; 601 case MPTCP_RST_ERESOURCE: 602 return SK_RST_REASON_MPTCP_RST_ERESOURCE; 603 case MPTCP_RST_EPROHIBIT: 604 return SK_RST_REASON_MPTCP_RST_EPROHIBIT; 605 case MPTCP_RST_EWQ2BIG: 606 return SK_RST_REASON_MPTCP_RST_EWQ2BIG; 607 case MPTCP_RST_EBADPERF: 608 return SK_RST_REASON_MPTCP_RST_EBADPERF; 609 case MPTCP_RST_EMIDDLEBOX: 610 return SK_RST_REASON_MPTCP_RST_EMIDDLEBOX; 611 default: 612 /* It should not happen, or else errors may occur 613 * in MPTCP layer 614 */ 615 return SK_RST_REASON_ERROR; 616 } 617 } 618 619 static inline void 620 mptcp_send_active_reset_reason(struct sock *sk) 621 { 622 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 623 enum sk_rst_reason reason; 624 625 reason = sk_rst_convert_mptcp_reason(subflow->reset_reason); 626 tcp_send_active_reset(sk, GFP_ATOMIC, reason); 627 } 628 629 static inline u64 630 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 631 { 632 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 633 subflow->ssn_offset - 634 subflow->map_subflow_seq; 635 } 636 637 static inline u64 638 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 639 { 640 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 641 } 642 643 void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 644 645 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 646 { 647 long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 648 struct mptcp_delegated_action *delegated; 649 bool schedule; 650 651 /* the caller held the subflow bh socket lock */ 652 lockdep_assert_in_softirq(); 653 654 /* The implied barrier pairs with tcp_release_cb_override() 655 * mptcp_napi_poll(), and ensures the below list check sees list 656 * updates done prior to delegated status bits changes 657 */ 658 old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 659 if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 660 if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 661 return; 662 663 delegated = this_cpu_ptr(&mptcp_delegated_actions); 664 schedule = list_empty(&delegated->head); 665 list_add_tail(&subflow->delegated_node, &delegated->head); 666 sock_hold(mptcp_subflow_tcp_sock(subflow)); 667 if (schedule) 668 napi_schedule(&delegated->napi); 669 } 670 } 671 672 static inline struct mptcp_subflow_context * 673 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 674 { 675 struct mptcp_subflow_context *ret; 676 677 if (list_empty(&delegated->head)) 678 return NULL; 679 680 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 681 list_del_init(&ret->delegated_node); 682 return ret; 683 } 684 685 int mptcp_is_enabled(const struct net *net); 686 unsigned int mptcp_get_add_addr_timeout(const struct net *net); 687 int mptcp_is_checksum_enabled(const struct net *net); 688 int mptcp_allow_join_id0(const struct net *net); 689 unsigned int mptcp_stale_loss_cnt(const struct net *net); 690 unsigned int mptcp_close_timeout(const struct sock *sk); 691 int mptcp_get_pm_type(const struct net *net); 692 const char *mptcp_get_scheduler(const struct net *net); 693 void mptcp_get_available_schedulers(char *buf, size_t maxlen); 694 void __mptcp_subflow_fully_established(struct mptcp_sock *msk, 695 struct mptcp_subflow_context *subflow, 696 const struct mptcp_options_received *mp_opt); 697 bool __mptcp_retransmit_pending_data(struct sock *sk); 698 void mptcp_check_and_set_pending(struct sock *sk); 699 void __mptcp_push_pending(struct sock *sk, unsigned int flags); 700 bool mptcp_subflow_data_available(struct sock *sk); 701 void __init mptcp_subflow_init(void); 702 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 703 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 704 struct mptcp_subflow_context *subflow); 705 void __mptcp_subflow_send_ack(struct sock *ssk); 706 void mptcp_subflow_reset(struct sock *ssk); 707 void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 708 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 709 struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 710 bool __mptcp_close(struct sock *sk, long timeout); 711 void mptcp_cancel_work(struct sock *sk); 712 void __mptcp_unaccepted_force_close(struct sock *sk); 713 void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 714 void mptcp_set_state(struct sock *sk, int state); 715 716 bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 717 const struct mptcp_addr_info *b, bool use_port); 718 void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 719 720 /* called with sk socket lock held */ 721 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 722 const struct mptcp_addr_info *remote); 723 int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 724 struct socket **new_sock); 725 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 726 struct sockaddr_storage *addr, 727 unsigned short family); 728 struct mptcp_sched_ops *mptcp_sched_find(const char *name); 729 int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 730 void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 731 void mptcp_sched_init(void); 732 int mptcp_init_sched(struct mptcp_sock *msk, 733 struct mptcp_sched_ops *sched); 734 void mptcp_release_sched(struct mptcp_sock *msk); 735 void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 736 bool scheduled); 737 struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 738 struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 739 int mptcp_sched_get_send(struct mptcp_sock *msk); 740 int mptcp_sched_get_retrans(struct mptcp_sock *msk); 741 742 static inline u64 mptcp_data_avail(const struct mptcp_sock *msk) 743 { 744 return READ_ONCE(msk->bytes_received) - READ_ONCE(msk->bytes_consumed); 745 } 746 747 static inline bool mptcp_epollin_ready(const struct sock *sk) 748 { 749 /* mptcp doesn't have to deal with small skbs in the receive queue, 750 * at it can always coalesce them 751 */ 752 return (mptcp_data_avail(mptcp_sk(sk)) >= sk->sk_rcvlowat) || 753 (mem_cgroup_sockets_enabled && sk->sk_memcg && 754 mem_cgroup_under_socket_pressure(sk->sk_memcg)) || 755 READ_ONCE(tcp_memory_pressure); 756 } 757 758 int mptcp_set_rcvlowat(struct sock *sk, int val); 759 760 static inline bool __tcp_can_send(const struct sock *ssk) 761 { 762 /* only send if our side has not closed yet */ 763 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 764 } 765 766 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 767 { 768 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 769 if (subflow->request_join && !subflow->fully_established) 770 return false; 771 772 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 773 } 774 775 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 776 777 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 778 779 void mptcp_subflow_drop_ctx(struct sock *ssk); 780 781 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 782 struct mptcp_subflow_context *ctx) 783 { 784 sk->sk_data_ready = sock_def_readable; 785 sk->sk_state_change = ctx->tcp_state_change; 786 sk->sk_write_space = sk_stream_write_space; 787 sk->sk_error_report = ctx->tcp_error_report; 788 789 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 790 } 791 792 void __init mptcp_proto_init(void); 793 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 794 int __init mptcp_proto_v6_init(void); 795 #endif 796 797 struct sock *mptcp_sk_clone_init(const struct sock *sk, 798 const struct mptcp_options_received *mp_opt, 799 struct sock *ssk, 800 struct request_sock *req); 801 void mptcp_get_options(const struct sk_buff *skb, 802 struct mptcp_options_received *mp_opt); 803 804 void mptcp_finish_connect(struct sock *sk); 805 void __mptcp_sync_state(struct sock *sk, int state); 806 void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 807 808 static inline void mptcp_stop_tout_timer(struct sock *sk) 809 { 810 if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 811 return; 812 813 sk_stop_timer(sk, &sk->sk_timer); 814 inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 815 } 816 817 static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 818 { 819 /* avoid 0 timestamp, as that means no close timeout */ 820 inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 821 } 822 823 static inline void mptcp_start_tout_timer(struct sock *sk) 824 { 825 mptcp_set_close_tout(sk, tcp_jiffies32); 826 mptcp_reset_tout_timer(mptcp_sk(sk), 0); 827 } 828 829 static inline bool mptcp_is_fully_established(struct sock *sk) 830 { 831 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 832 READ_ONCE(mptcp_sk(sk)->fully_established); 833 } 834 835 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 836 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 837 bool mptcp_finish_join(struct sock *sk); 838 bool mptcp_schedule_work(struct sock *sk); 839 int mptcp_setsockopt(struct sock *sk, int level, int optname, 840 sockptr_t optval, unsigned int optlen); 841 int mptcp_getsockopt(struct sock *sk, int level, int optname, 842 char __user *optval, int __user *option); 843 844 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 845 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 846 { 847 if (use_64bit) 848 return cur_seq; 849 850 return __mptcp_expand_seq(old_seq, cur_seq); 851 } 852 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 853 void __mptcp_data_acked(struct sock *sk); 854 void __mptcp_error_report(struct sock *sk); 855 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 856 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 857 { 858 return READ_ONCE(msk->snd_data_fin_enable) && 859 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 860 } 861 862 static inline u32 mptcp_notsent_lowat(const struct sock *sk) 863 { 864 struct net *net = sock_net(sk); 865 u32 val; 866 867 val = READ_ONCE(mptcp_sk(sk)->notsent_lowat); 868 return val ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat); 869 } 870 871 static inline bool mptcp_stream_memory_free(const struct sock *sk, int wake) 872 { 873 const struct mptcp_sock *msk = mptcp_sk(sk); 874 u32 notsent_bytes; 875 876 notsent_bytes = READ_ONCE(msk->write_seq) - READ_ONCE(msk->snd_nxt); 877 return (notsent_bytes << wake) < mptcp_notsent_lowat(sk); 878 } 879 880 static inline bool __mptcp_stream_is_writeable(const struct sock *sk, int wake) 881 { 882 return mptcp_stream_memory_free(sk, wake) && 883 __sk_stream_is_writeable(sk, wake); 884 } 885 886 static inline void mptcp_write_space(struct sock *sk) 887 { 888 /* pairs with memory barrier in mptcp_poll */ 889 smp_mb(); 890 if (mptcp_stream_memory_free(sk, 1)) 891 sk_stream_write_space(sk); 892 } 893 894 static inline void __mptcp_sync_sndbuf(struct sock *sk) 895 { 896 struct mptcp_subflow_context *subflow; 897 int ssk_sndbuf, new_sndbuf; 898 899 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 900 return; 901 902 new_sndbuf = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_wmem[0]); 903 mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 904 ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf); 905 906 subflow->cached_sndbuf = ssk_sndbuf; 907 new_sndbuf += ssk_sndbuf; 908 } 909 910 /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */ 911 WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); 912 mptcp_write_space(sk); 913 } 914 915 /* The called held both the msk socket and the subflow socket locks, 916 * possibly under BH 917 */ 918 static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 919 { 920 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 921 922 if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) 923 __mptcp_sync_sndbuf(sk); 924 } 925 926 /* the caller held only the subflow socket lock, either in process or 927 * BH context. Additionally this can be called under the msk data lock, 928 * so we can't acquire such lock here: let the delegate action acquires 929 * the needed locks in suitable order. 930 */ 931 static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 932 { 933 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 934 935 if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) 936 return; 937 938 local_bh_disable(); 939 mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); 940 local_bh_enable(); 941 } 942 943 void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 944 945 #define MPTCP_TOKEN_MAX_RETRIES 4 946 947 void __init mptcp_token_init(void); 948 static inline void mptcp_token_init_request(struct request_sock *req) 949 { 950 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 951 } 952 953 int mptcp_token_new_request(struct request_sock *req); 954 void mptcp_token_destroy_request(struct request_sock *req); 955 int mptcp_token_new_connect(struct sock *ssk); 956 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 957 struct mptcp_sock *msk); 958 bool mptcp_token_exists(u32 token); 959 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 960 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 961 long *s_num); 962 void mptcp_token_destroy(struct mptcp_sock *msk); 963 964 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 965 966 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 967 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 968 969 void __init mptcp_pm_init(void); 970 void mptcp_pm_data_init(struct mptcp_sock *msk); 971 void mptcp_pm_data_reset(struct mptcp_sock *msk); 972 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 973 struct mptcp_addr_info *addr); 974 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 975 bool require_family, 976 struct mptcp_pm_addr_entry *entry); 977 bool mptcp_pm_addr_families_match(const struct sock *sk, 978 const struct mptcp_addr_info *loc, 979 const struct mptcp_addr_info *rem); 980 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 981 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 982 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 983 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 984 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 985 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 986 void mptcp_pm_subflow_established(struct mptcp_sock *msk); 987 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 988 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, 989 const struct mptcp_subflow_context *subflow); 990 void mptcp_pm_add_addr_received(const struct sock *ssk, 991 const struct mptcp_addr_info *addr); 992 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 993 const struct mptcp_addr_info *addr); 994 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 995 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 996 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 997 const struct mptcp_rm_list *rm_list); 998 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 999 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 1000 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 1001 struct mptcp_addr_info *addr, 1002 struct mptcp_addr_info *rem, 1003 u8 bkup); 1004 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 1005 const struct mptcp_addr_info *addr); 1006 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 1007 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 1008 struct mptcp_pm_add_entry * 1009 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 1010 const struct mptcp_addr_info *addr, bool check_id); 1011 struct mptcp_pm_add_entry * 1012 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 1013 const struct mptcp_addr_info *addr); 1014 int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 1015 unsigned int id, 1016 u8 *flags, int *ifindex); 1017 int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, 1018 u8 *flags, int *ifindex); 1019 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 1020 unsigned int id, 1021 u8 *flags, int *ifindex); 1022 int mptcp_pm_set_flags(struct sk_buff *skb, struct genl_info *info); 1023 int mptcp_pm_nl_set_flags(struct sk_buff *skb, struct genl_info *info); 1024 int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info); 1025 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 1026 const struct mptcp_addr_info *addr, 1027 bool echo); 1028 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 1029 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 1030 void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); 1031 1032 void mptcp_free_local_addr_list(struct mptcp_sock *msk); 1033 1034 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 1035 const struct sock *ssk, gfp_t gfp); 1036 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 1037 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 1038 void mptcp_event_pm_listener(const struct sock *ssk, 1039 enum mptcp_event_type event); 1040 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 1041 1042 void __mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 1043 const struct mptcp_options_received *mp_opt); 1044 void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 1045 struct request_sock *req); 1046 int mptcp_nl_fill_addr(struct sk_buff *skb, 1047 struct mptcp_pm_addr_entry *entry); 1048 1049 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 1050 { 1051 return READ_ONCE(msk->pm.addr_signal) & 1052 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 1053 } 1054 1055 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 1056 { 1057 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 1058 } 1059 1060 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 1061 { 1062 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 1063 } 1064 1065 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 1066 { 1067 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 1068 } 1069 1070 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 1071 { 1072 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 1073 } 1074 1075 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 1076 { 1077 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 1078 } 1079 1080 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 1081 { 1082 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 1083 1084 if (family == AF_INET6) 1085 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 1086 if (!echo) 1087 len += MPTCPOPT_THMAC_LEN; 1088 /* account for 2 trailing 'nop' options */ 1089 if (port) 1090 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 1091 1092 return len; 1093 } 1094 1095 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 1096 { 1097 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 1098 return -EINVAL; 1099 1100 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 1101 } 1102 1103 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 1104 unsigned int opt_size, unsigned int remaining, 1105 struct mptcp_addr_info *addr, bool *echo, 1106 bool *drop_other_suboptions); 1107 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 1108 struct mptcp_rm_list *rm_list); 1109 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 1110 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1111 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1112 bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc); 1113 bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1114 bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1115 int mptcp_pm_dump_addr(struct sk_buff *msg, struct netlink_callback *cb); 1116 int mptcp_pm_nl_dump_addr(struct sk_buff *msg, 1117 struct netlink_callback *cb); 1118 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, 1119 struct netlink_callback *cb); 1120 int mptcp_pm_get_addr(struct sk_buff *skb, struct genl_info *info); 1121 int mptcp_pm_nl_get_addr(struct sk_buff *skb, struct genl_info *info); 1122 int mptcp_userspace_pm_get_addr(struct sk_buff *skb, 1123 struct genl_info *info); 1124 1125 static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow) 1126 { 1127 int local_id = READ_ONCE(subflow->local_id); 1128 1129 if (local_id < 0) 1130 return 0; 1131 return local_id; 1132 } 1133 1134 void __init mptcp_pm_nl_init(void); 1135 void mptcp_pm_nl_work(struct mptcp_sock *msk); 1136 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 1137 const struct mptcp_rm_list *rm_list); 1138 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 1139 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 1140 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 1141 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 1142 1143 /* called under PM lock */ 1144 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 1145 { 1146 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 1147 WRITE_ONCE(msk->pm.accept_subflow, true); 1148 } 1149 1150 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 1151 { 1152 spin_lock_bh(&msk->pm.lock); 1153 __mptcp_pm_close_subflow(msk); 1154 spin_unlock_bh(&msk->pm.lock); 1155 } 1156 1157 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 1158 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 1159 1160 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 1161 { 1162 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 1163 } 1164 1165 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 1166 1167 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 1168 { 1169 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1170 } 1171 1172 static inline bool mptcp_check_fallback(const struct sock *sk) 1173 { 1174 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1175 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1176 1177 return __mptcp_check_fallback(msk); 1178 } 1179 1180 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1181 { 1182 if (__mptcp_check_fallback(msk)) { 1183 pr_debug("TCP fallback already done (msk=%p)", msk); 1184 return; 1185 } 1186 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1187 } 1188 1189 static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk) 1190 { 1191 struct sock *ssk = READ_ONCE(msk->first); 1192 1193 return ssk && ((1 << inet_sk_state_load(ssk)) & 1194 (TCPF_ESTABLISHED | TCPF_SYN_SENT | 1195 TCPF_SYN_RECV | TCPF_LISTEN)); 1196 } 1197 1198 static inline void mptcp_do_fallback(struct sock *ssk) 1199 { 1200 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1201 struct sock *sk = subflow->conn; 1202 struct mptcp_sock *msk; 1203 1204 msk = mptcp_sk(sk); 1205 __mptcp_do_fallback(msk); 1206 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1207 gfp_t saved_allocation = ssk->sk_allocation; 1208 1209 /* we are in a atomic (BH) scope, override ssk default for data 1210 * fin allocation 1211 */ 1212 ssk->sk_allocation = GFP_ATOMIC; 1213 ssk->sk_shutdown |= SEND_SHUTDOWN; 1214 tcp_shutdown(ssk, SEND_SHUTDOWN); 1215 ssk->sk_allocation = saved_allocation; 1216 } 1217 } 1218 1219 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 1220 1221 static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 1222 { 1223 struct mptcp_ext *mpext; 1224 1225 mpext = skb ? mptcp_get_ext(skb) : NULL; 1226 if (mpext && mpext->infinite_map) 1227 return true; 1228 1229 return false; 1230 } 1231 1232 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 1233 { 1234 return (subflow->request_mptcp || subflow->request_join); 1235 } 1236 1237 static inline bool subflow_simultaneous_connect(struct sock *sk) 1238 { 1239 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1240 1241 return (1 << sk->sk_state) & 1242 (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING) && 1243 is_active_ssk(subflow) && 1244 !subflow->conn_finished; 1245 } 1246 1247 #ifdef CONFIG_SYN_COOKIES 1248 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1249 struct sk_buff *skb); 1250 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1251 struct sk_buff *skb); 1252 void __init mptcp_join_cookie_init(void); 1253 #else 1254 static inline void 1255 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1256 struct sk_buff *skb) {} 1257 static inline bool 1258 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1259 struct sk_buff *skb) 1260 { 1261 return false; 1262 } 1263 1264 static inline void mptcp_join_cookie_init(void) {} 1265 #endif 1266 1267 #endif /* __MPTCP_PROTOCOL_H */ 1268