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 #define MPTCP_DEQUEUE 8 128 129 struct mptcp_skb_cb { 130 u64 map_seq; 131 u64 end_seq; 132 u32 offset; 133 u8 has_rxtstamp; 134 u8 cant_coalesce; 135 }; 136 137 #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) 138 139 static inline bool before64(__u64 seq1, __u64 seq2) 140 { 141 return (__s64)(seq1 - seq2) < 0; 142 } 143 144 #define after64(seq2, seq1) before64(seq1, seq2) 145 146 struct mptcp_options_received { 147 u64 sndr_key; 148 u64 rcvr_key; 149 u64 data_ack; 150 u64 data_seq; 151 u32 subflow_seq; 152 u16 data_len; 153 __sum16 csum; 154 struct_group(status, 155 u16 suboptions; 156 u16 use_map:1, 157 dsn64:1, 158 data_fin:1, 159 use_ack:1, 160 ack64:1, 161 mpc_map:1, 162 reset_reason:4, 163 reset_transient:1, 164 echo:1, 165 backup:1, 166 deny_join_id0:1, 167 __unused:2; 168 ); 169 u8 join_id; 170 u32 token; 171 u32 nonce; 172 u64 thmac; 173 u8 hmac[MPTCPOPT_HMAC_LEN]; 174 struct mptcp_addr_info addr; 175 struct mptcp_rm_list rm_list; 176 u64 ahmac; 177 u64 fail_seq; 178 }; 179 180 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 181 { 182 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 183 ((nib & 0xF) << 8) | field); 184 } 185 186 enum mptcp_pm_status { 187 MPTCP_PM_ADD_ADDR_RECEIVED, 188 MPTCP_PM_ADD_ADDR_SEND_ACK, 189 MPTCP_PM_RM_ADDR_RECEIVED, 190 MPTCP_PM_ESTABLISHED, 191 MPTCP_PM_SUBFLOW_ESTABLISHED, 192 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 193 MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is 194 * accounted int id_avail_bitmap 195 */ 196 }; 197 198 enum mptcp_pm_type { 199 MPTCP_PM_TYPE_KERNEL = 0, 200 MPTCP_PM_TYPE_USERSPACE, 201 202 __MPTCP_PM_TYPE_NR, 203 __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1, 204 }; 205 206 /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */ 207 #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1) 208 209 enum mptcp_addr_signal_status { 210 MPTCP_ADD_ADDR_SIGNAL, 211 MPTCP_ADD_ADDR_ECHO, 212 MPTCP_RM_ADDR_SIGNAL, 213 }; 214 215 /* max value of mptcp_addr_info.id */ 216 #define MPTCP_PM_MAX_ADDR_ID U8_MAX 217 218 struct mptcp_pm_data { 219 struct mptcp_addr_info local; 220 struct mptcp_addr_info remote; 221 struct list_head anno_list; 222 struct list_head userspace_pm_local_addr_list; 223 224 spinlock_t lock; /*protects the whole PM data */ 225 226 struct_group(reset, 227 228 u8 addr_signal; 229 bool server_side; 230 bool work_pending; 231 bool accept_addr; 232 bool accept_subflow; 233 bool remote_deny_join_id0; 234 u8 add_addr_signaled; 235 u8 add_addr_accepted; 236 u8 local_addr_used; 237 u8 pm_type; 238 u8 subflows; 239 u8 status; 240 241 ); 242 243 DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 244 struct mptcp_rm_list rm_list_tx; 245 struct mptcp_rm_list rm_list_rx; 246 }; 247 248 struct mptcp_pm_local { 249 struct mptcp_addr_info addr; 250 u8 flags; 251 int ifindex; 252 }; 253 254 struct mptcp_pm_addr_entry { 255 struct list_head list; 256 struct mptcp_addr_info addr; 257 u8 flags; 258 int ifindex; 259 struct socket *lsk; 260 }; 261 262 struct mptcp_data_frag { 263 struct list_head list; 264 u64 data_seq; 265 u16 data_len; 266 u16 offset; 267 u16 overhead; 268 u16 already_sent; 269 struct page *page; 270 }; 271 272 /* MPTCP connection sock */ 273 struct mptcp_sock { 274 /* inet_connection_sock must be the first member */ 275 struct inet_connection_sock sk; 276 u64 local_key; /* protected by the first subflow socket lock 277 * lockless access read 278 */ 279 u64 remote_key; /* same as above */ 280 u64 write_seq; 281 u64 bytes_sent; 282 u64 snd_nxt; 283 u64 bytes_received; 284 u64 ack_seq; 285 atomic64_t rcv_wnd_sent; 286 u64 rcv_data_fin_seq; 287 u64 bytes_retrans; 288 u64 bytes_consumed; 289 int snd_burst; 290 int old_wspace; 291 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 292 * recovery related fields are under data_lock 293 * protection 294 */ 295 u64 bytes_acked; 296 u64 snd_una; 297 u64 wnd_end; 298 u32 last_data_sent; 299 u32 last_data_recv; 300 u32 last_ack_recv; 301 unsigned long timer_ival; 302 u32 token; 303 unsigned long flags; 304 unsigned long cb_flags; 305 bool recovery; /* closing subflow write queue reinjected */ 306 bool can_ack; 307 bool fully_established; 308 bool rcv_data_fin; 309 bool snd_data_fin_enable; 310 bool rcv_fastclose; 311 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 312 bool csum_enabled; 313 bool allow_infinite_fallback; 314 u8 pending_state; /* A subflow asked to set this sk_state, 315 * protected by the msk data lock 316 */ 317 u8 mpc_endpoint_id; 318 u8 recvmsg_inq:1, 319 cork:1, 320 nodelay:1, 321 fastopening:1, 322 in_accept_queue:1, 323 free_first:1, 324 rcvspace_init:1; 325 u32 notsent_lowat; 326 int keepalive_cnt; 327 int keepalive_idle; 328 int keepalive_intvl; 329 struct work_struct work; 330 struct sk_buff *ooo_last_skb; 331 struct rb_root out_of_order_queue; 332 struct list_head conn_list; 333 struct list_head rtx_queue; 334 struct mptcp_data_frag *first_pending; 335 struct list_head join_list; 336 struct sock *first; /* The mptcp ops can safely dereference, using suitable 337 * ONCE annotation, the subflow outside the socket 338 * lock as such sock is freed after close(). 339 */ 340 struct mptcp_pm_data pm; 341 struct mptcp_sched_ops *sched; 342 struct { 343 u32 space; /* bytes copied in last measurement window */ 344 u32 copied; /* bytes copied in this measurement window */ 345 u64 time; /* start time of measurement window */ 346 u64 rtt_us; /* last maximum rtt of subflows */ 347 } rcvq_space; 348 u8 scaling_ratio; 349 350 u32 subflow_id; 351 u32 setsockopt_seq; 352 char ca_name[TCP_CA_NAME_MAX]; 353 }; 354 355 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 356 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 357 358 #define mptcp_for_each_subflow(__msk, __subflow) \ 359 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 360 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 361 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 362 #define mptcp_next_subflow(__msk, __subflow) \ 363 list_next_entry_circular(__subflow, &((__msk)->conn_list), node) 364 365 extern struct genl_family mptcp_genl_family; 366 367 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 368 { 369 sock_owned_by_me((const struct sock *)msk); 370 } 371 372 #ifdef CONFIG_DEBUG_NET 373 /* MPTCP-specific: we might (indirectly) call this helper with the wrong sk */ 374 #undef tcp_sk 375 #define tcp_sk(ptr) ({ \ 376 typeof(ptr) _ptr = (ptr); \ 377 WARN_ON(_ptr->sk_protocol != IPPROTO_TCP); \ 378 container_of_const(_ptr, struct tcp_sock, inet_conn.icsk_inet.sk); \ 379 }) 380 #define mptcp_sk(ptr) ({ \ 381 typeof(ptr) _ptr = (ptr); \ 382 WARN_ON(_ptr->sk_protocol != IPPROTO_MPTCP); \ 383 container_of_const(_ptr, struct mptcp_sock, sk.icsk_inet.sk); \ 384 }) 385 386 #else /* !CONFIG_DEBUG_NET */ 387 #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 388 #endif 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) - 403 sk_rmem_alloc_get(sk)); 404 } 405 406 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 407 { 408 const struct mptcp_sock *msk = mptcp_sk(sk); 409 410 return READ_ONCE(msk->first_pending); 411 } 412 413 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 414 { 415 struct mptcp_sock *msk = mptcp_sk(sk); 416 struct mptcp_data_frag *cur; 417 418 cur = msk->first_pending; 419 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 420 list_next_entry(cur, list); 421 } 422 423 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 424 { 425 const struct mptcp_sock *msk = mptcp_sk(sk); 426 427 if (!msk->first_pending) 428 return NULL; 429 430 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 431 return NULL; 432 433 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 434 } 435 436 static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 437 { 438 struct mptcp_sock *msk = mptcp_sk(sk); 439 440 if (msk->snd_una == msk->snd_nxt) 441 return NULL; 442 443 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 444 } 445 446 struct csum_pseudo_header { 447 __be64 data_seq; 448 __be32 subflow_seq; 449 __be16 data_len; 450 __sum16 csum; 451 }; 452 453 struct mptcp_subflow_request_sock { 454 struct tcp_request_sock sk; 455 u16 mp_capable : 1, 456 mp_join : 1, 457 backup : 1, 458 request_bkup : 1, 459 csum_reqd : 1, 460 allow_join_id0 : 1; 461 u8 local_id; 462 u8 remote_id; 463 u64 local_key; 464 u64 idsn; 465 u32 token; 466 u32 ssn_offset; 467 u64 thmac; 468 u32 local_nonce; 469 u32 remote_nonce; 470 struct mptcp_sock *msk; 471 struct hlist_nulls_node token_node; 472 }; 473 474 static inline struct mptcp_subflow_request_sock * 475 mptcp_subflow_rsk(const struct request_sock *rsk) 476 { 477 return (struct mptcp_subflow_request_sock *)rsk; 478 } 479 480 struct mptcp_delegated_action { 481 struct napi_struct napi; 482 struct list_head head; 483 }; 484 485 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 486 487 #define MPTCP_DELEGATE_SCHEDULED 0 488 #define MPTCP_DELEGATE_SEND 1 489 #define MPTCP_DELEGATE_ACK 2 490 #define MPTCP_DELEGATE_SNDBUF 3 491 492 #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 493 /* MPTCP subflow context */ 494 struct mptcp_subflow_context { 495 struct list_head node;/* conn_list of subflows */ 496 497 struct_group(reset, 498 499 unsigned long avg_pacing_rate; /* protected by msk socket lock */ 500 u64 local_key; 501 u64 remote_key; 502 u64 idsn; 503 u64 map_seq; 504 u32 snd_isn; 505 u32 token; 506 u32 rel_write_seq; 507 u32 map_subflow_seq; 508 u32 ssn_offset; 509 u32 map_data_len; 510 __wsum map_data_csum; 511 u32 map_csum_len; 512 u32 request_mptcp : 1, /* send MP_CAPABLE */ 513 request_join : 1, /* send MP_JOIN */ 514 request_bkup : 1, 515 mp_capable : 1, /* remote is MPTCP capable */ 516 mp_join : 1, /* remote is JOINing */ 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 : 9; 536 bool data_avail; 537 bool scheduled; 538 bool pm_listener; /* a listener managed by the kernel PM? */ 539 bool fully_established; /* path validated */ 540 u32 remote_nonce; 541 u64 thmac; 542 u32 local_nonce; 543 u32 remote_token; 544 union { 545 u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 546 u64 iasn; /* initial ack sequence number, MPC subflows only */ 547 }; 548 s16 local_id; /* if negative not initialized yet */ 549 u8 remote_id; 550 u8 reset_seen:1; 551 u8 reset_transient:1; 552 u8 reset_reason:4; 553 u8 stale_count; 554 555 u32 subflow_id; 556 557 long delegated_status; 558 unsigned long fail_tout; 559 560 ); 561 562 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 563 564 u32 setsockopt_seq; 565 u32 stale_rcv_tstamp; 566 int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, 567 * protected by the msk socket lock 568 */ 569 570 struct sock *tcp_sock; /* tcp sk backpointer */ 571 struct sock *conn; /* parent mptcp_sock */ 572 const struct inet_connection_sock_af_ops *icsk_af_ops; 573 void (*tcp_state_change)(struct sock *sk); 574 void (*tcp_error_report)(struct sock *sk); 575 576 struct rcu_head rcu; 577 }; 578 579 static inline struct mptcp_subflow_context * 580 mptcp_subflow_ctx(const struct sock *sk) 581 { 582 const struct inet_connection_sock *icsk = inet_csk(sk); 583 584 /* Use RCU on icsk_ulp_data only for sock diag code */ 585 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 586 } 587 588 static inline struct sock * 589 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 590 { 591 return subflow->tcp_sock; 592 } 593 594 static inline void 595 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 596 { 597 memset(&subflow->reset, 0, sizeof(subflow->reset)); 598 subflow->request_mptcp = 1; 599 WRITE_ONCE(subflow->local_id, -1); 600 } 601 602 /* Convert reset reasons in MPTCP to enum sk_rst_reason type */ 603 static inline enum sk_rst_reason 604 sk_rst_convert_mptcp_reason(u32 reason) 605 { 606 switch (reason) { 607 case MPTCP_RST_EUNSPEC: 608 return SK_RST_REASON_MPTCP_RST_EUNSPEC; 609 case MPTCP_RST_EMPTCP: 610 return SK_RST_REASON_MPTCP_RST_EMPTCP; 611 case MPTCP_RST_ERESOURCE: 612 return SK_RST_REASON_MPTCP_RST_ERESOURCE; 613 case MPTCP_RST_EPROHIBIT: 614 return SK_RST_REASON_MPTCP_RST_EPROHIBIT; 615 case MPTCP_RST_EWQ2BIG: 616 return SK_RST_REASON_MPTCP_RST_EWQ2BIG; 617 case MPTCP_RST_EBADPERF: 618 return SK_RST_REASON_MPTCP_RST_EBADPERF; 619 case MPTCP_RST_EMIDDLEBOX: 620 return SK_RST_REASON_MPTCP_RST_EMIDDLEBOX; 621 default: 622 /* It should not happen, or else errors may occur 623 * in MPTCP layer 624 */ 625 return SK_RST_REASON_ERROR; 626 } 627 } 628 629 static inline void 630 mptcp_send_active_reset_reason(struct sock *sk) 631 { 632 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 633 enum sk_rst_reason reason; 634 635 reason = sk_rst_convert_mptcp_reason(subflow->reset_reason); 636 tcp_send_active_reset(sk, GFP_ATOMIC, reason); 637 } 638 639 static inline u64 640 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 641 { 642 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 643 subflow->ssn_offset - 644 subflow->map_subflow_seq; 645 } 646 647 static inline u64 648 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 649 { 650 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 651 } 652 653 void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 654 655 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 656 { 657 long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 658 struct mptcp_delegated_action *delegated; 659 bool schedule; 660 661 /* the caller held the subflow bh socket lock */ 662 lockdep_assert_in_softirq(); 663 664 /* The implied barrier pairs with tcp_release_cb_override() 665 * mptcp_napi_poll(), and ensures the below list check sees list 666 * updates done prior to delegated status bits changes 667 */ 668 old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 669 if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 670 if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 671 return; 672 673 delegated = this_cpu_ptr(&mptcp_delegated_actions); 674 schedule = list_empty(&delegated->head); 675 list_add_tail(&subflow->delegated_node, &delegated->head); 676 sock_hold(mptcp_subflow_tcp_sock(subflow)); 677 if (schedule) 678 napi_schedule(&delegated->napi); 679 } 680 } 681 682 static inline struct mptcp_subflow_context * 683 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 684 { 685 struct mptcp_subflow_context *ret; 686 687 if (list_empty(&delegated->head)) 688 return NULL; 689 690 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 691 list_del_init(&ret->delegated_node); 692 return ret; 693 } 694 695 int mptcp_is_enabled(const struct net *net); 696 unsigned int mptcp_get_add_addr_timeout(const struct net *net); 697 int mptcp_is_checksum_enabled(const struct net *net); 698 int mptcp_allow_join_id0(const struct net *net); 699 unsigned int mptcp_stale_loss_cnt(const struct net *net); 700 unsigned int mptcp_close_timeout(const struct sock *sk); 701 int mptcp_get_pm_type(const struct net *net); 702 const char *mptcp_get_path_manager(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_state(struct sock *sk, int state); 730 731 bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 732 const struct mptcp_addr_info *b, bool use_port); 733 void mptcp_local_address(const struct sock_common *skc, 734 struct mptcp_addr_info *addr); 735 void mptcp_remote_address(const struct sock_common *skc, 736 struct mptcp_addr_info *addr); 737 738 /* called with sk socket lock held */ 739 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_pm_local *local, 740 const struct mptcp_addr_info *remote); 741 int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 742 struct socket **new_sock); 743 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 744 struct sockaddr_storage *addr, 745 unsigned short family); 746 struct mptcp_sched_ops *mptcp_sched_find(const char *name); 747 int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 748 void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 749 void mptcp_sched_init(void); 750 int mptcp_init_sched(struct mptcp_sock *msk, 751 struct mptcp_sched_ops *sched); 752 void mptcp_release_sched(struct mptcp_sock *msk); 753 void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 754 bool scheduled); 755 struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 756 struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 757 int mptcp_sched_get_send(struct mptcp_sock *msk); 758 int mptcp_sched_get_retrans(struct mptcp_sock *msk); 759 760 static inline u64 mptcp_data_avail(const struct mptcp_sock *msk) 761 { 762 return READ_ONCE(msk->bytes_received) - READ_ONCE(msk->bytes_consumed); 763 } 764 765 static inline bool mptcp_epollin_ready(const struct sock *sk) 766 { 767 u64 data_avail = mptcp_data_avail(mptcp_sk(sk)); 768 769 if (!data_avail) 770 return false; 771 772 /* mptcp doesn't have to deal with small skbs in the receive queue, 773 * as it can always coalesce them 774 */ 775 return (data_avail >= sk->sk_rcvlowat) || 776 (mem_cgroup_sockets_enabled && sk->sk_memcg && 777 mem_cgroup_under_socket_pressure(sk->sk_memcg)) || 778 READ_ONCE(tcp_memory_pressure); 779 } 780 781 int mptcp_set_rcvlowat(struct sock *sk, int val); 782 783 static inline bool __tcp_can_send(const struct sock *ssk) 784 { 785 /* only send if our side has not closed yet */ 786 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 787 } 788 789 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 790 { 791 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 792 if (subflow->request_join && !READ_ONCE(subflow->fully_established)) 793 return false; 794 795 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 796 } 797 798 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 799 800 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 801 802 void mptcp_subflow_drop_ctx(struct sock *ssk); 803 804 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 805 struct mptcp_subflow_context *ctx) 806 { 807 sk->sk_data_ready = sock_def_readable; 808 sk->sk_state_change = ctx->tcp_state_change; 809 sk->sk_write_space = sk_stream_write_space; 810 sk->sk_error_report = ctx->tcp_error_report; 811 812 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 813 } 814 815 void __init mptcp_proto_init(void); 816 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 817 int __init mptcp_proto_v6_init(void); 818 #endif 819 820 struct sock *mptcp_sk_clone_init(const struct sock *sk, 821 const struct mptcp_options_received *mp_opt, 822 struct sock *ssk, 823 struct request_sock *req); 824 void mptcp_get_options(const struct sk_buff *skb, 825 struct mptcp_options_received *mp_opt); 826 827 void mptcp_finish_connect(struct sock *sk); 828 void __mptcp_sync_state(struct sock *sk, int state); 829 void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 830 831 static inline void mptcp_stop_tout_timer(struct sock *sk) 832 { 833 if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 834 return; 835 836 sk_stop_timer(sk, &sk->sk_timer); 837 inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 838 } 839 840 static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 841 { 842 /* avoid 0 timestamp, as that means no close timeout */ 843 inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 844 } 845 846 static inline void mptcp_start_tout_timer(struct sock *sk) 847 { 848 mptcp_set_close_tout(sk, tcp_jiffies32); 849 mptcp_reset_tout_timer(mptcp_sk(sk), 0); 850 } 851 852 static inline bool mptcp_is_fully_established(struct sock *sk) 853 { 854 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 855 READ_ONCE(mptcp_sk(sk)->fully_established); 856 } 857 858 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 859 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 860 bool mptcp_finish_join(struct sock *sk); 861 bool mptcp_schedule_work(struct sock *sk); 862 int mptcp_setsockopt(struct sock *sk, int level, int optname, 863 sockptr_t optval, unsigned int optlen); 864 int mptcp_getsockopt(struct sock *sk, int level, int optname, 865 char __user *optval, int __user *option); 866 867 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 868 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 869 { 870 if (use_64bit) 871 return cur_seq; 872 873 return __mptcp_expand_seq(old_seq, cur_seq); 874 } 875 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 876 void __mptcp_data_acked(struct sock *sk); 877 void __mptcp_error_report(struct sock *sk); 878 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 879 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 880 { 881 return READ_ONCE(msk->snd_data_fin_enable) && 882 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 883 } 884 885 static inline u32 mptcp_notsent_lowat(const struct sock *sk) 886 { 887 struct net *net = sock_net(sk); 888 u32 val; 889 890 val = READ_ONCE(mptcp_sk(sk)->notsent_lowat); 891 return val ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat); 892 } 893 894 static inline bool mptcp_stream_memory_free(const struct sock *sk, int wake) 895 { 896 const struct mptcp_sock *msk = mptcp_sk(sk); 897 u32 notsent_bytes; 898 899 notsent_bytes = READ_ONCE(msk->write_seq) - READ_ONCE(msk->snd_nxt); 900 return (notsent_bytes << wake) < mptcp_notsent_lowat(sk); 901 } 902 903 static inline bool __mptcp_stream_is_writeable(const struct sock *sk, int wake) 904 { 905 return mptcp_stream_memory_free(sk, wake) && 906 __sk_stream_is_writeable(sk, wake); 907 } 908 909 static inline void mptcp_write_space(struct sock *sk) 910 { 911 /* pairs with memory barrier in mptcp_poll */ 912 smp_mb(); 913 if (mptcp_stream_memory_free(sk, 1)) 914 sk_stream_write_space(sk); 915 } 916 917 static inline void __mptcp_sync_sndbuf(struct sock *sk) 918 { 919 struct mptcp_subflow_context *subflow; 920 int ssk_sndbuf, new_sndbuf; 921 922 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 923 return; 924 925 new_sndbuf = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_wmem[0]); 926 mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 927 ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf); 928 929 subflow->cached_sndbuf = ssk_sndbuf; 930 new_sndbuf += ssk_sndbuf; 931 } 932 933 /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */ 934 WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); 935 mptcp_write_space(sk); 936 } 937 938 /* The called held both the msk socket and the subflow socket locks, 939 * possibly under BH 940 */ 941 static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 942 { 943 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 944 945 if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) 946 __mptcp_sync_sndbuf(sk); 947 } 948 949 /* the caller held only the subflow socket lock, either in process or 950 * BH context. Additionally this can be called under the msk data lock, 951 * so we can't acquire such lock here: let the delegate action acquires 952 * the needed locks in suitable order. 953 */ 954 static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 955 { 956 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 957 958 if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) 959 return; 960 961 local_bh_disable(); 962 mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); 963 local_bh_enable(); 964 } 965 966 void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 967 968 #define MPTCP_TOKEN_MAX_RETRIES 4 969 970 void __init mptcp_token_init(void); 971 static inline void mptcp_token_init_request(struct request_sock *req) 972 { 973 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 974 } 975 976 int mptcp_token_new_request(struct request_sock *req); 977 void mptcp_token_destroy_request(struct request_sock *req); 978 int mptcp_token_new_connect(struct sock *ssk); 979 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 980 struct mptcp_sock *msk); 981 bool mptcp_token_exists(u32 token); 982 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 983 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 984 long *s_num); 985 void mptcp_token_destroy(struct mptcp_sock *msk); 986 987 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 988 989 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 990 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 991 992 void __init mptcp_pm_init(void); 993 void mptcp_pm_data_init(struct mptcp_sock *msk); 994 void mptcp_pm_data_reset(struct mptcp_sock *msk); 995 void mptcp_pm_destroy(struct mptcp_sock *msk); 996 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 997 struct mptcp_addr_info *addr); 998 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 999 bool require_family, 1000 struct mptcp_pm_addr_entry *entry); 1001 bool mptcp_pm_addr_families_match(const struct sock *sk, 1002 const struct mptcp_addr_info *loc, 1003 const struct mptcp_addr_info *rem); 1004 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 1005 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 1006 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 1007 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 1008 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 1009 void mptcp_pm_subflow_established(struct mptcp_sock *msk); 1010 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 1011 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, 1012 const struct mptcp_subflow_context *subflow); 1013 void mptcp_pm_add_addr_received(const struct sock *ssk, 1014 const struct mptcp_addr_info *addr); 1015 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 1016 const struct mptcp_addr_info *addr); 1017 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 1018 void mptcp_pm_send_ack(struct mptcp_sock *msk, 1019 struct mptcp_subflow_context *subflow, 1020 bool prio, bool backup); 1021 void mptcp_pm_addr_send_ack(struct mptcp_sock *msk); 1022 void mptcp_pm_nl_rm_addr(struct mptcp_sock *msk, u8 rm_id); 1023 void mptcp_pm_rm_subflow(struct mptcp_sock *msk, 1024 const struct mptcp_rm_list *rm_list); 1025 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 1026 const struct mptcp_rm_list *rm_list); 1027 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 1028 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 1029 int mptcp_pm_mp_prio_send_ack(struct mptcp_sock *msk, 1030 struct mptcp_addr_info *addr, 1031 struct mptcp_addr_info *rem, 1032 u8 bkup); 1033 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 1034 const struct mptcp_addr_info *addr); 1035 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 1036 struct mptcp_pm_add_entry * 1037 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 1038 const struct mptcp_addr_info *addr, bool check_id); 1039 bool mptcp_lookup_subflow_by_saddr(const struct list_head *list, 1040 const struct mptcp_addr_info *saddr); 1041 bool mptcp_remove_anno_list_by_saddr(struct mptcp_sock *msk, 1042 const struct mptcp_addr_info *addr); 1043 int mptcp_pm_nl_set_flags(struct mptcp_pm_addr_entry *local, 1044 struct genl_info *info); 1045 int mptcp_userspace_pm_set_flags(struct mptcp_pm_addr_entry *local, 1046 struct genl_info *info); 1047 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 1048 const struct mptcp_addr_info *addr, 1049 bool echo); 1050 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 1051 void mptcp_pm_remove_addr_entry(struct mptcp_sock *msk, 1052 struct mptcp_pm_addr_entry *entry); 1053 1054 /* the default path manager, used in mptcp_pm_unregister */ 1055 extern struct mptcp_pm_ops mptcp_pm_kernel; 1056 1057 struct mptcp_pm_ops *mptcp_pm_find(const char *name); 1058 int mptcp_pm_register(struct mptcp_pm_ops *pm_ops); 1059 void mptcp_pm_unregister(struct mptcp_pm_ops *pm_ops); 1060 int mptcp_pm_validate(struct mptcp_pm_ops *pm_ops); 1061 void mptcp_pm_get_available(char *buf, size_t maxlen); 1062 1063 void mptcp_userspace_pm_free_local_addr_list(struct mptcp_sock *msk); 1064 1065 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 1066 const struct sock *ssk, gfp_t gfp); 1067 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 1068 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 1069 void mptcp_event_pm_listener(const struct sock *ssk, 1070 enum mptcp_event_type event); 1071 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 1072 1073 void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 1074 struct request_sock *req); 1075 int mptcp_pm_genl_fill_addr(struct sk_buff *msg, 1076 struct netlink_callback *cb, 1077 struct mptcp_pm_addr_entry *entry); 1078 1079 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 1080 { 1081 return READ_ONCE(msk->pm.addr_signal) & 1082 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 1083 } 1084 1085 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 1086 { 1087 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 1088 } 1089 1090 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 1091 { 1092 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 1093 } 1094 1095 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 1096 { 1097 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 1098 } 1099 1100 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 1101 { 1102 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 1103 } 1104 1105 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 1106 { 1107 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 1108 } 1109 1110 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 1111 { 1112 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 1113 1114 if (family == AF_INET6) 1115 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 1116 if (!echo) 1117 len += MPTCPOPT_THMAC_LEN; 1118 /* account for 2 trailing 'nop' options */ 1119 if (port) 1120 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 1121 1122 return len; 1123 } 1124 1125 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 1126 { 1127 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 1128 return -EINVAL; 1129 1130 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 1131 } 1132 1133 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 1134 unsigned int opt_size, unsigned int remaining, 1135 struct mptcp_addr_info *addr, bool *echo, 1136 bool *drop_other_suboptions); 1137 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 1138 struct mptcp_rm_list *rm_list); 1139 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 1140 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, 1141 struct mptcp_pm_addr_entry *skc); 1142 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, 1143 struct mptcp_pm_addr_entry *skc); 1144 bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc); 1145 bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1146 bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1147 int mptcp_pm_nl_dump_addr(struct sk_buff *msg, 1148 struct netlink_callback *cb); 1149 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, 1150 struct netlink_callback *cb); 1151 int mptcp_pm_nl_get_addr(u8 id, struct mptcp_pm_addr_entry *addr, 1152 struct genl_info *info); 1153 int mptcp_userspace_pm_get_addr(u8 id, struct mptcp_pm_addr_entry *addr, 1154 struct genl_info *info); 1155 1156 static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow) 1157 { 1158 int local_id = READ_ONCE(subflow->local_id); 1159 1160 if (local_id < 0) 1161 return 0; 1162 return local_id; 1163 } 1164 1165 void __init mptcp_pm_kernel_register(void); 1166 void __init mptcp_pm_userspace_register(void); 1167 void __init mptcp_pm_nl_init(void); 1168 void mptcp_pm_worker(struct mptcp_sock *msk); 1169 void __mptcp_pm_kernel_worker(struct mptcp_sock *msk); 1170 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 1171 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 1172 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 1173 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 1174 1175 /* called under PM lock */ 1176 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 1177 { 1178 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 1179 WRITE_ONCE(msk->pm.accept_subflow, true); 1180 } 1181 1182 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 1183 { 1184 spin_lock_bh(&msk->pm.lock); 1185 __mptcp_pm_close_subflow(msk); 1186 spin_unlock_bh(&msk->pm.lock); 1187 } 1188 1189 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 1190 1191 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 1192 { 1193 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 1194 } 1195 1196 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 1197 1198 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 1199 { 1200 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1201 } 1202 1203 static inline bool mptcp_check_fallback(const struct sock *sk) 1204 { 1205 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1206 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1207 1208 return __mptcp_check_fallback(msk); 1209 } 1210 1211 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1212 { 1213 if (__mptcp_check_fallback(msk)) { 1214 pr_debug("TCP fallback already done (msk=%p)\n", msk); 1215 return; 1216 } 1217 if (WARN_ON_ONCE(!READ_ONCE(msk->allow_infinite_fallback))) 1218 return; 1219 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1220 } 1221 1222 static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk) 1223 { 1224 struct sock *ssk = READ_ONCE(msk->first); 1225 1226 return ssk && ((1 << inet_sk_state_load(ssk)) & 1227 (TCPF_ESTABLISHED | TCPF_SYN_SENT | 1228 TCPF_SYN_RECV | TCPF_LISTEN)); 1229 } 1230 1231 static inline void mptcp_do_fallback(struct sock *ssk) 1232 { 1233 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1234 struct sock *sk = subflow->conn; 1235 struct mptcp_sock *msk; 1236 1237 msk = mptcp_sk(sk); 1238 __mptcp_do_fallback(msk); 1239 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1240 gfp_t saved_allocation = ssk->sk_allocation; 1241 1242 /* we are in a atomic (BH) scope, override ssk default for data 1243 * fin allocation 1244 */ 1245 ssk->sk_allocation = GFP_ATOMIC; 1246 ssk->sk_shutdown |= SEND_SHUTDOWN; 1247 tcp_shutdown(ssk, SEND_SHUTDOWN); 1248 ssk->sk_allocation = saved_allocation; 1249 } 1250 } 1251 1252 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)\n", __func__, a) 1253 1254 static inline void mptcp_subflow_early_fallback(struct mptcp_sock *msk, 1255 struct mptcp_subflow_context *subflow) 1256 { 1257 pr_fallback(msk); 1258 subflow->request_mptcp = 0; 1259 __mptcp_do_fallback(msk); 1260 } 1261 1262 static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 1263 { 1264 struct mptcp_ext *mpext; 1265 1266 mpext = skb ? mptcp_get_ext(skb) : NULL; 1267 if (mpext && mpext->infinite_map) 1268 return true; 1269 1270 return false; 1271 } 1272 1273 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 1274 { 1275 return (subflow->request_mptcp || subflow->request_join); 1276 } 1277 1278 static inline bool subflow_simultaneous_connect(struct sock *sk) 1279 { 1280 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1281 1282 return (1 << sk->sk_state) & 1283 (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING) && 1284 is_active_ssk(subflow) && 1285 !subflow->conn_finished; 1286 } 1287 1288 #ifdef CONFIG_SYN_COOKIES 1289 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1290 struct sk_buff *skb); 1291 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1292 struct sk_buff *skb); 1293 void __init mptcp_join_cookie_init(void); 1294 #else 1295 static inline void 1296 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1297 struct sk_buff *skb) {} 1298 static inline bool 1299 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1300 struct sk_buff *skb) 1301 { 1302 return false; 1303 } 1304 1305 static inline void mptcp_join_cookie_init(void) {} 1306 #endif 1307 1308 #endif /* __MPTCP_PROTOCOL_H */ 1309