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; 133 u8 cant_coalesce; 134 }; 135 136 #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) 137 138 static inline bool before64(__u64 seq1, __u64 seq2) 139 { 140 return (__s64)(seq1 - seq2) < 0; 141 } 142 143 #define after64(seq2, seq1) before64(seq1, seq2) 144 145 struct mptcp_options_received { 146 u64 sndr_key; 147 u64 rcvr_key; 148 u64 data_ack; 149 u64 data_seq; 150 u32 subflow_seq; 151 u16 data_len; 152 __sum16 csum; 153 struct_group(status, 154 u16 suboptions; 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 ); 168 u8 join_id; 169 u32 token; 170 u32 nonce; 171 u64 thmac; 172 u8 hmac[MPTCPOPT_HMAC_LEN]; 173 struct mptcp_addr_info addr; 174 struct mptcp_rm_list rm_list; 175 u64 ahmac; 176 u64 fail_seq; 177 }; 178 179 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 180 { 181 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 182 ((nib & 0xF) << 8) | field); 183 } 184 185 enum mptcp_pm_status { 186 MPTCP_PM_ADD_ADDR_RECEIVED, 187 MPTCP_PM_ADD_ADDR_SEND_ACK, 188 MPTCP_PM_RM_ADDR_RECEIVED, 189 MPTCP_PM_ESTABLISHED, 190 MPTCP_PM_SUBFLOW_ESTABLISHED, 191 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 192 MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is 193 * accounted int id_avail_bitmap 194 */ 195 }; 196 197 enum mptcp_pm_type { 198 MPTCP_PM_TYPE_KERNEL = 0, 199 MPTCP_PM_TYPE_USERSPACE, 200 201 __MPTCP_PM_TYPE_NR, 202 __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1, 203 }; 204 205 /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */ 206 #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1) 207 208 enum mptcp_addr_signal_status { 209 MPTCP_ADD_ADDR_SIGNAL, 210 MPTCP_ADD_ADDR_ECHO, 211 MPTCP_RM_ADDR_SIGNAL, 212 }; 213 214 /* max value of mptcp_addr_info.id */ 215 #define MPTCP_PM_MAX_ADDR_ID U8_MAX 216 217 struct mptcp_pm_data { 218 struct mptcp_addr_info local; 219 struct mptcp_addr_info remote; 220 struct list_head anno_list; 221 struct list_head userspace_pm_local_addr_list; 222 223 spinlock_t lock; /*protects the whole PM data */ 224 225 struct_group(reset, 226 227 u8 addr_signal; 228 bool server_side; 229 bool work_pending; 230 bool accept_addr; 231 bool accept_subflow; 232 bool remote_deny_join_id0; 233 u8 add_addr_signaled; 234 u8 add_addr_accepted; 235 u8 local_addr_used; 236 u8 pm_type; 237 u8 extra_subflows; 238 u8 status; 239 240 ); 241 242 DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 243 struct mptcp_rm_list rm_list_tx; 244 struct mptcp_rm_list rm_list_rx; 245 }; 246 247 struct mptcp_pm_local { 248 struct mptcp_addr_info addr; 249 u32 flags; 250 int ifindex; 251 }; 252 253 struct mptcp_pm_addr_entry { 254 struct list_head list; 255 struct mptcp_addr_info addr; 256 u32 flags; 257 int ifindex; 258 struct socket *lsk; 259 }; 260 261 struct mptcp_data_frag { 262 struct list_head list; 263 u64 data_seq; 264 u16 data_len; 265 u16 offset; 266 u16 overhead; 267 u16 already_sent; 268 struct page *page; 269 }; 270 271 /* MPTCP connection sock */ 272 struct mptcp_sock { 273 /* inet_connection_sock must be the first member */ 274 struct inet_connection_sock sk; 275 u64 local_key; /* protected by the first subflow socket lock 276 * lockless access read 277 */ 278 u64 remote_key; /* same as above */ 279 u64 write_seq; 280 u64 bytes_sent; 281 u64 snd_nxt; 282 u64 bytes_received; 283 u64 ack_seq; 284 atomic64_t rcv_wnd_sent; 285 u64 rcv_data_fin_seq; 286 u64 bytes_retrans; 287 u64 bytes_consumed; 288 int snd_burst; 289 int old_wspace; 290 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 291 * recovery related fields are under data_lock 292 * protection 293 */ 294 u64 bytes_acked; 295 u64 snd_una; 296 u64 wnd_end; 297 u32 last_data_sent; 298 u32 last_data_recv; 299 u32 last_ack_recv; 300 unsigned long timer_ival; 301 u32 token; 302 unsigned long flags; 303 unsigned long cb_flags; 304 bool recovery; /* closing subflow write queue reinjected */ 305 bool can_ack; 306 bool fully_established; 307 bool rcv_data_fin; 308 bool snd_data_fin_enable; 309 bool rcv_fastclose; 310 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 311 bool csum_enabled; 312 bool allow_infinite_fallback; 313 u8 pending_state; /* A subflow asked to set this sk_state, 314 * protected by the msk data lock 315 */ 316 u8 mpc_endpoint_id; 317 u8 recvmsg_inq:1, 318 cork:1, 319 nodelay:1, 320 fastopening:1, 321 in_accept_queue:1, 322 free_first:1, 323 rcvspace_init:1, 324 fastclosing:1; 325 u32 notsent_lowat; 326 int keepalive_cnt; 327 int keepalive_idle; 328 int keepalive_intvl; 329 int maxseg; 330 struct work_struct work; 331 struct sk_buff *ooo_last_skb; 332 struct rb_root out_of_order_queue; 333 struct list_head conn_list; 334 struct list_head rtx_queue; 335 struct mptcp_data_frag *first_pending; 336 struct list_head join_list; 337 struct sock *first; /* The mptcp ops can safely dereference, using suitable 338 * ONCE annotation, the subflow outside the socket 339 * lock as such sock is freed after close(). 340 */ 341 struct mptcp_pm_data pm; 342 struct mptcp_sched_ops *sched; 343 struct { 344 int space; /* bytes copied in last measurement window */ 345 int copied; /* bytes copied in this measurement window */ 346 u64 time; /* start time of measurement window */ 347 u64 rtt_us; /* last maximum rtt of subflows */ 348 } rcvq_space; 349 u8 scaling_ratio; 350 bool allow_subflows; 351 352 u32 subflow_id; 353 u32 setsockopt_seq; 354 char ca_name[TCP_CA_NAME_MAX]; 355 356 spinlock_t fallback_lock; /* protects fallback, 357 * allow_infinite_fallback and 358 * allow_join 359 */ 360 361 struct list_head backlog_list; /* protected by the data lock */ 362 u32 backlog_len; 363 u32 backlog_unaccounted; 364 }; 365 366 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 367 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 368 369 #define mptcp_for_each_subflow(__msk, __subflow) \ 370 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 371 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 372 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 373 #define mptcp_next_subflow(__msk, __subflow) \ 374 list_next_entry_circular(__subflow, &((__msk)->conn_list), node) 375 376 extern struct genl_family mptcp_genl_family; 377 378 static inline void msk_owned_by_me(const struct mptcp_sock *msk) 379 { 380 sock_owned_by_me((const struct sock *)msk); 381 } 382 383 #ifdef CONFIG_DEBUG_NET 384 /* MPTCP-specific: we might (indirectly) call this helper with the wrong sk */ 385 #undef tcp_sk 386 #define tcp_sk(ptr) ({ \ 387 typeof(ptr) _ptr = (ptr); \ 388 WARN_ON(_ptr->sk_protocol != IPPROTO_TCP); \ 389 container_of_const(_ptr, struct tcp_sock, inet_conn.icsk_inet.sk); \ 390 }) 391 #define mptcp_sk(ptr) ({ \ 392 typeof(ptr) _ptr = (ptr); \ 393 WARN_ON(_ptr->sk_protocol != IPPROTO_MPTCP); \ 394 container_of_const(_ptr, struct mptcp_sock, sk.icsk_inet.sk); \ 395 }) 396 397 #else /* !CONFIG_DEBUG_NET */ 398 #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 399 #endif 400 401 static inline int mptcp_win_from_space(const struct sock *sk, int space) 402 { 403 return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); 404 } 405 406 static inline int mptcp_space_from_win(const struct sock *sk, int win) 407 { 408 return __tcp_space_from_win(mptcp_sk(sk)->scaling_ratio, win); 409 } 410 411 static inline int __mptcp_space(const struct sock *sk) 412 { 413 return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - 414 READ_ONCE(mptcp_sk(sk)->backlog_len) - 415 sk_rmem_alloc_get(sk)); 416 } 417 418 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 419 { 420 const struct mptcp_sock *msk = mptcp_sk(sk); 421 422 return msk->first_pending; 423 } 424 425 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 426 { 427 struct mptcp_sock *msk = mptcp_sk(sk); 428 struct mptcp_data_frag *cur; 429 430 cur = msk->first_pending; 431 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 432 list_next_entry(cur, list); 433 } 434 435 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 436 { 437 const struct mptcp_sock *msk = mptcp_sk(sk); 438 439 if (!msk->first_pending) 440 return NULL; 441 442 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 443 return NULL; 444 445 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 446 } 447 448 static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 449 { 450 struct mptcp_sock *msk = mptcp_sk(sk); 451 452 if (msk->snd_una == msk->snd_nxt) 453 return NULL; 454 455 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 456 } 457 458 struct csum_pseudo_header { 459 __be64 data_seq; 460 __be32 subflow_seq; 461 __be16 data_len; 462 __sum16 csum; 463 }; 464 465 struct mptcp_subflow_request_sock { 466 struct tcp_request_sock sk; 467 u16 mp_capable : 1, 468 mp_join : 1, 469 backup : 1, 470 request_bkup : 1, 471 csum_reqd : 1, 472 allow_join_id0 : 1; 473 u8 local_id; 474 u8 remote_id; 475 u64 local_key; 476 u64 idsn; 477 u32 token; 478 u32 ssn_offset; 479 u64 thmac; 480 u32 local_nonce; 481 u32 remote_nonce; 482 struct mptcp_sock *msk; 483 struct hlist_nulls_node token_node; 484 }; 485 486 static inline struct mptcp_subflow_request_sock * 487 mptcp_subflow_rsk(const struct request_sock *rsk) 488 { 489 return (struct mptcp_subflow_request_sock *)rsk; 490 } 491 492 struct mptcp_delegated_action { 493 struct napi_struct napi; 494 local_lock_t bh_lock; 495 struct list_head head; 496 }; 497 498 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 499 500 #define MPTCP_DELEGATE_SCHEDULED 0 501 #define MPTCP_DELEGATE_SEND 1 502 #define MPTCP_DELEGATE_ACK 2 503 #define MPTCP_DELEGATE_SNDBUF 3 504 505 #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 506 /* MPTCP subflow context */ 507 struct mptcp_subflow_context { 508 struct list_head node;/* conn_list of subflows */ 509 510 struct_group(reset, 511 512 unsigned long avg_pacing_rate; /* protected by msk socket lock */ 513 u64 local_key; 514 u64 remote_key; 515 u64 idsn; 516 u64 map_seq; 517 u64 rcv_wnd_sent; 518 u32 snd_isn; 519 u32 token; 520 u32 rel_write_seq; 521 u32 map_subflow_seq; 522 u32 ssn_offset; 523 u32 map_data_len; 524 __wsum map_data_csum; 525 u32 map_csum_len; 526 u32 request_mptcp : 1, /* send MP_CAPABLE */ 527 request_join : 1, /* send MP_JOIN */ 528 request_bkup : 1, 529 mp_capable : 1, /* remote is MPTCP capable */ 530 mp_join : 1, /* remote is JOINing */ 531 pm_notified : 1, /* PM hook called for established status */ 532 conn_finished : 1, 533 map_valid : 1, 534 map_csum_reqd : 1, 535 map_data_fin : 1, 536 mpc_map : 1, 537 backup : 1, 538 send_mp_prio : 1, 539 send_mp_fail : 1, 540 send_fastclose : 1, 541 send_infinite_map : 1, 542 remote_key_valid : 1, /* received the peer key from */ 543 disposable : 1, /* ctx can be free at ulp release time */ 544 closing : 1, /* must not pass rx data to msk anymore */ 545 stale : 1, /* unable to snd/rcv data, do not use for xmit */ 546 valid_csum_seen : 1, /* at least one csum validated */ 547 is_mptfo : 1, /* subflow is doing TFO */ 548 close_event_done : 1, /* has done the post-closed part */ 549 mpc_drop : 1, /* the MPC option has been dropped in a rtx */ 550 __unused : 8; 551 bool data_avail; 552 bool scheduled; 553 bool pm_listener; /* a listener managed by the kernel PM? */ 554 bool fully_established; /* path validated */ 555 u32 lent_mem_frag; 556 u32 remote_nonce; 557 u64 thmac; 558 u32 local_nonce; 559 u32 remote_token; 560 union { 561 u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 562 u64 iasn; /* initial ack sequence number, MPC subflows only */ 563 }; 564 s16 local_id; /* if negative not initialized yet */ 565 u8 remote_id; 566 u8 reset_seen:1; 567 u8 reset_transient:1; 568 u8 reset_reason:4; 569 u8 stale_count; 570 571 u32 subflow_id; 572 573 long delegated_status; 574 unsigned long fail_tout; 575 576 ); 577 578 struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 579 580 u32 setsockopt_seq; 581 u32 stale_rcv_tstamp; 582 int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, 583 * protected by the msk socket lock 584 */ 585 586 struct sock *tcp_sock; /* tcp sk backpointer */ 587 struct sock *conn; /* parent mptcp_sock */ 588 const struct inet_connection_sock_af_ops *icsk_af_ops; 589 void (*tcp_state_change)(struct sock *sk); 590 void (*tcp_error_report)(struct sock *sk); 591 592 struct rcu_head rcu; 593 }; 594 595 static inline struct mptcp_subflow_context * 596 mptcp_subflow_ctx(const struct sock *sk) 597 { 598 const struct inet_connection_sock *icsk = inet_csk(sk); 599 600 /* Use RCU on icsk_ulp_data only for sock diag code */ 601 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 602 } 603 604 static inline struct sock * 605 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 606 { 607 return subflow->tcp_sock; 608 } 609 610 static inline void 611 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 612 { 613 memset(&subflow->reset, 0, sizeof(subflow->reset)); 614 subflow->request_mptcp = 1; 615 WRITE_ONCE(subflow->local_id, -1); 616 } 617 618 /* Convert reset reasons in MPTCP to enum sk_rst_reason type */ 619 static inline enum sk_rst_reason 620 sk_rst_convert_mptcp_reason(u32 reason) 621 { 622 switch (reason) { 623 case MPTCP_RST_EUNSPEC: 624 return SK_RST_REASON_MPTCP_RST_EUNSPEC; 625 case MPTCP_RST_EMPTCP: 626 return SK_RST_REASON_MPTCP_RST_EMPTCP; 627 case MPTCP_RST_ERESOURCE: 628 return SK_RST_REASON_MPTCP_RST_ERESOURCE; 629 case MPTCP_RST_EPROHIBIT: 630 return SK_RST_REASON_MPTCP_RST_EPROHIBIT; 631 case MPTCP_RST_EWQ2BIG: 632 return SK_RST_REASON_MPTCP_RST_EWQ2BIG; 633 case MPTCP_RST_EBADPERF: 634 return SK_RST_REASON_MPTCP_RST_EBADPERF; 635 case MPTCP_RST_EMIDDLEBOX: 636 return SK_RST_REASON_MPTCP_RST_EMIDDLEBOX; 637 default: 638 /* It should not happen, or else errors may occur 639 * in MPTCP layer 640 */ 641 return SK_RST_REASON_ERROR; 642 } 643 } 644 645 static inline void 646 mptcp_send_active_reset_reason(struct sock *sk) 647 { 648 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 649 enum sk_rst_reason reason; 650 651 reason = sk_rst_convert_mptcp_reason(subflow->reset_reason); 652 tcp_send_active_reset(sk, GFP_ATOMIC, reason); 653 } 654 655 /* Made the fwd mem carried by the given skb available to the msk, 656 * To be paired with a previous mptcp_subflow_lend_fwdmem() before freeing 657 * the skb or setting the skb ownership. 658 */ 659 static inline void mptcp_borrow_fwdmem(struct sock *sk, struct sk_buff *skb) 660 { 661 struct sock *ssk = skb->sk; 662 663 /* The subflow just lend the skb fwd memory; if the subflow meanwhile 664 * closed, mptcp_close_ssk() already released the ssk rcv memory. 665 */ 666 DEBUG_NET_WARN_ON_ONCE(skb->destructor); 667 sk_forward_alloc_add(sk, skb->truesize); 668 if (!ssk) 669 return; 670 671 atomic_sub(skb->truesize, &ssk->sk_rmem_alloc); 672 skb->sk = NULL; 673 } 674 675 static inline void 676 __mptcp_subflow_lend_fwdmem(struct mptcp_subflow_context *subflow, int size) 677 { 678 int frag = (subflow->lent_mem_frag + size) & (PAGE_SIZE - 1); 679 680 subflow->lent_mem_frag = frag; 681 } 682 683 static inline void 684 mptcp_subflow_lend_fwdmem(struct mptcp_subflow_context *subflow, 685 struct sk_buff *skb) 686 { 687 __mptcp_subflow_lend_fwdmem(subflow, skb->truesize); 688 skb->destructor = NULL; 689 } 690 691 static inline u64 692 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 693 { 694 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 695 subflow->ssn_offset - 696 subflow->map_subflow_seq; 697 } 698 699 static inline u64 700 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 701 { 702 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 703 } 704 705 void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 706 707 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 708 { 709 long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 710 struct mptcp_delegated_action *delegated; 711 bool schedule; 712 713 /* the caller held the subflow bh socket lock */ 714 lockdep_assert_in_softirq(); 715 716 /* The implied barrier pairs with tcp_release_cb_override() 717 * mptcp_napi_poll(), and ensures the below list check sees list 718 * updates done prior to delegated status bits changes 719 */ 720 old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 721 if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 722 if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 723 return; 724 725 local_lock_nested_bh(&mptcp_delegated_actions.bh_lock); 726 delegated = this_cpu_ptr(&mptcp_delegated_actions); 727 schedule = list_empty(&delegated->head); 728 list_add_tail(&subflow->delegated_node, &delegated->head); 729 local_unlock_nested_bh(&mptcp_delegated_actions.bh_lock); 730 sock_hold(mptcp_subflow_tcp_sock(subflow)); 731 if (schedule) 732 napi_schedule(&delegated->napi); 733 } 734 } 735 736 static inline struct mptcp_subflow_context * 737 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 738 { 739 struct mptcp_subflow_context *ret; 740 741 local_lock_nested_bh(&mptcp_delegated_actions.bh_lock); 742 if (list_empty(&delegated->head)) { 743 local_unlock_nested_bh(&mptcp_delegated_actions.bh_lock); 744 return NULL; 745 } 746 747 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 748 list_del_init(&ret->delegated_node); 749 local_unlock_nested_bh(&mptcp_delegated_actions.bh_lock); 750 return ret; 751 } 752 753 void __mptcp_inherit_memcg(struct sock *sk, struct sock *ssk, gfp_t gfp); 754 void __mptcp_inherit_cgrp_data(struct sock *sk, struct sock *ssk); 755 756 int mptcp_is_enabled(const struct net *net); 757 unsigned int mptcp_get_add_addr_timeout(const struct net *net); 758 int mptcp_is_checksum_enabled(const struct net *net); 759 int mptcp_allow_join_id0(const struct net *net); 760 unsigned int mptcp_stale_loss_cnt(const struct net *net); 761 unsigned int mptcp_close_timeout(const struct sock *sk); 762 int mptcp_get_pm_type(const struct net *net); 763 const char *mptcp_get_path_manager(const struct net *net); 764 const char *mptcp_get_scheduler(const struct net *net); 765 766 void mptcp_active_disable(struct sock *sk); 767 bool mptcp_active_should_disable(struct sock *ssk); 768 void mptcp_active_enable(struct sock *sk); 769 770 void mptcp_get_available_schedulers(char *buf, size_t maxlen); 771 void __mptcp_subflow_fully_established(struct mptcp_sock *msk, 772 struct mptcp_subflow_context *subflow, 773 const struct mptcp_options_received *mp_opt); 774 bool __mptcp_retransmit_pending_data(struct sock *sk); 775 void mptcp_check_and_set_pending(struct sock *sk); 776 void __mptcp_push_pending(struct sock *sk, unsigned int flags); 777 bool mptcp_subflow_data_available(struct sock *sk); 778 void __init mptcp_subflow_init(void); 779 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 780 void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 781 struct mptcp_subflow_context *subflow); 782 void __mptcp_subflow_send_ack(struct sock *ssk); 783 void mptcp_subflow_reset(struct sock *ssk); 784 void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 785 void mptcp_sock_graft(struct sock *sk, struct socket *parent); 786 struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 787 bool __mptcp_close(struct sock *sk, long timeout); 788 void mptcp_cancel_work(struct sock *sk); 789 void __mptcp_unaccepted_force_close(struct sock *sk); 790 void mptcp_set_state(struct sock *sk, int state); 791 792 bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 793 const struct mptcp_addr_info *b, bool use_port); 794 void mptcp_local_address(const struct sock_common *skc, 795 struct mptcp_addr_info *addr); 796 void mptcp_remote_address(const struct sock_common *skc, 797 struct mptcp_addr_info *addr); 798 799 /* called with sk socket lock held */ 800 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_pm_local *local, 801 const struct mptcp_addr_info *remote); 802 int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 803 struct socket **new_sock); 804 void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 805 struct sockaddr_storage *addr, 806 unsigned short family); 807 struct mptcp_sched_ops *mptcp_sched_find(const char *name); 808 int mptcp_validate_scheduler(struct mptcp_sched_ops *sched); 809 int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 810 void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 811 void mptcp_sched_init(void); 812 int mptcp_init_sched(struct mptcp_sock *msk, 813 struct mptcp_sched_ops *sched); 814 void mptcp_release_sched(struct mptcp_sock *msk); 815 void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 816 bool scheduled); 817 struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 818 struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 819 int mptcp_sched_get_send(struct mptcp_sock *msk); 820 int mptcp_sched_get_retrans(struct mptcp_sock *msk); 821 822 static inline u64 mptcp_data_avail(const struct mptcp_sock *msk) 823 { 824 return READ_ONCE(msk->bytes_received) - READ_ONCE(msk->bytes_consumed); 825 } 826 827 static inline bool mptcp_epollin_ready(const struct sock *sk) 828 { 829 u64 data_avail = mptcp_data_avail(mptcp_sk(sk)); 830 831 if (!data_avail) 832 return false; 833 834 /* mptcp doesn't have to deal with small skbs in the receive queue, 835 * as it can always coalesce them 836 */ 837 return (data_avail >= sk->sk_rcvlowat) || 838 tcp_under_memory_pressure(sk); 839 } 840 841 int mptcp_set_rcvlowat(struct sock *sk, int val); 842 843 static inline bool __tcp_can_send(const struct sock *ssk) 844 { 845 /* only send if our side has not closed yet */ 846 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 847 } 848 849 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 850 { 851 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 852 if (subflow->request_join && !READ_ONCE(subflow->fully_established)) 853 return false; 854 855 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 856 } 857 858 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 859 860 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 861 862 void mptcp_subflow_drop_ctx(struct sock *ssk); 863 864 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 865 struct mptcp_subflow_context *ctx) 866 { 867 sk->sk_data_ready = sock_def_readable; 868 sk->sk_state_change = ctx->tcp_state_change; 869 sk->sk_write_space = sk_stream_write_space; 870 sk->sk_error_report = ctx->tcp_error_report; 871 872 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 873 } 874 875 void __init mptcp_proto_init(void); 876 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 877 int __init mptcp_proto_v6_init(void); 878 #endif 879 880 struct sock *mptcp_sk_clone_init(const struct sock *sk, 881 const struct mptcp_options_received *mp_opt, 882 struct sock *ssk, 883 struct request_sock *req); 884 void mptcp_get_options(const struct sk_buff *skb, 885 struct mptcp_options_received *mp_opt); 886 887 void mptcp_finish_connect(struct sock *sk); 888 void __mptcp_sync_state(struct sock *sk, int state); 889 void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 890 891 static inline void mptcp_stop_tout_timer(struct sock *sk) 892 { 893 if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 894 return; 895 896 sk_stop_timer(sk, &inet_csk(sk)->mptcp_tout_timer); 897 inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 898 } 899 900 static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 901 { 902 /* avoid 0 timestamp, as that means no close timeout */ 903 inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 904 } 905 906 static inline void mptcp_start_tout_timer(struct sock *sk) 907 { 908 mptcp_set_close_tout(sk, tcp_jiffies32); 909 mptcp_reset_tout_timer(mptcp_sk(sk), 0); 910 } 911 912 static inline bool mptcp_is_fully_established(struct sock *sk) 913 { 914 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 915 READ_ONCE(mptcp_sk(sk)->fully_established); 916 } 917 918 static inline u64 mptcp_stamp(void) 919 { 920 return div_u64(tcp_clock_ns(), NSEC_PER_USEC); 921 } 922 923 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 924 bool mptcp_finish_join(struct sock *sk); 925 bool mptcp_schedule_work(struct sock *sk); 926 int mptcp_setsockopt(struct sock *sk, int level, int optname, 927 sockptr_t optval, unsigned int optlen); 928 int mptcp_getsockopt(struct sock *sk, int level, int optname, 929 char __user *optval, int __user *option); 930 931 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 932 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 933 { 934 if (use_64bit) 935 return cur_seq; 936 937 return __mptcp_expand_seq(old_seq, cur_seq); 938 } 939 void __mptcp_check_push(struct sock *sk, struct sock *ssk); 940 void __mptcp_data_acked(struct sock *sk); 941 void __mptcp_error_report(struct sock *sk); 942 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 943 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 944 { 945 return READ_ONCE(msk->snd_data_fin_enable) && 946 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 947 } 948 949 static inline u32 mptcp_notsent_lowat(const struct sock *sk) 950 { 951 struct net *net = sock_net(sk); 952 u32 val; 953 954 val = READ_ONCE(mptcp_sk(sk)->notsent_lowat); 955 return val ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat); 956 } 957 958 static inline bool mptcp_stream_memory_free(const struct sock *sk, int wake) 959 { 960 const struct mptcp_sock *msk = mptcp_sk(sk); 961 u32 notsent_bytes; 962 963 notsent_bytes = READ_ONCE(msk->write_seq) - READ_ONCE(msk->snd_nxt); 964 return (notsent_bytes << wake) < mptcp_notsent_lowat(sk); 965 } 966 967 static inline bool __mptcp_stream_is_writeable(const struct sock *sk, int wake) 968 { 969 return mptcp_stream_memory_free(sk, wake) && 970 __sk_stream_is_writeable(sk, wake); 971 } 972 973 static inline void mptcp_write_space(struct sock *sk) 974 { 975 /* pairs with memory barrier in mptcp_poll */ 976 smp_mb(); 977 if (mptcp_stream_memory_free(sk, 1)) 978 INDIRECT_CALL_1(sk->sk_write_space, sk_stream_write_space, sk); 979 } 980 981 static inline void __mptcp_sync_sndbuf(struct sock *sk) 982 { 983 struct mptcp_subflow_context *subflow; 984 int ssk_sndbuf, new_sndbuf; 985 986 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 987 return; 988 989 new_sndbuf = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_wmem[0]); 990 mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 991 ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf); 992 993 subflow->cached_sndbuf = ssk_sndbuf; 994 new_sndbuf += ssk_sndbuf; 995 } 996 997 /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */ 998 WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); 999 mptcp_write_space(sk); 1000 } 1001 1002 /* The called held both the msk socket and the subflow socket locks, 1003 * possibly under BH 1004 */ 1005 static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 1006 { 1007 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1008 1009 if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) 1010 __mptcp_sync_sndbuf(sk); 1011 } 1012 1013 /* the caller held only the subflow socket lock, either in process or 1014 * BH context. Additionally this can be called under the msk data lock, 1015 * so we can't acquire such lock here: let the delegate action acquires 1016 * the needed locks in suitable order. 1017 */ 1018 static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 1019 { 1020 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1021 1022 if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) 1023 return; 1024 1025 local_bh_disable(); 1026 mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); 1027 local_bh_enable(); 1028 } 1029 1030 #define MPTCP_TOKEN_MAX_RETRIES 4 1031 1032 void __init mptcp_token_init(void); 1033 static inline void mptcp_token_init_request(struct request_sock *req) 1034 { 1035 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 1036 } 1037 1038 int mptcp_token_new_request(struct request_sock *req); 1039 void mptcp_token_destroy_request(struct request_sock *req); 1040 int mptcp_token_new_connect(struct sock *ssk); 1041 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 1042 struct mptcp_sock *msk); 1043 bool mptcp_token_exists(u32 token); 1044 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 1045 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 1046 long *s_num); 1047 void mptcp_token_destroy(struct mptcp_sock *msk); 1048 1049 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 1050 1051 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 1052 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 1053 1054 void __init mptcp_pm_init(void); 1055 void mptcp_pm_data_init(struct mptcp_sock *msk); 1056 void mptcp_pm_data_reset(struct mptcp_sock *msk); 1057 void mptcp_pm_destroy(struct mptcp_sock *msk); 1058 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 1059 struct mptcp_addr_info *addr); 1060 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 1061 bool require_family, 1062 struct mptcp_pm_addr_entry *entry); 1063 bool mptcp_pm_addr_families_match(const struct sock *sk, 1064 const struct mptcp_addr_info *loc, 1065 const struct mptcp_addr_info *rem); 1066 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 1067 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 1068 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 1069 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 1070 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 1071 void mptcp_pm_subflow_established(struct mptcp_sock *msk); 1072 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 1073 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, 1074 const struct mptcp_subflow_context *subflow); 1075 void mptcp_pm_add_addr_received(const struct sock *ssk, 1076 const struct mptcp_addr_info *addr); 1077 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 1078 const struct mptcp_addr_info *addr); 1079 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 1080 void mptcp_pm_send_ack(struct mptcp_sock *msk, 1081 struct mptcp_subflow_context *subflow, 1082 bool prio, bool backup); 1083 void mptcp_pm_addr_send_ack(struct mptcp_sock *msk); 1084 void mptcp_pm_nl_rm_addr(struct mptcp_sock *msk, u8 rm_id); 1085 void mptcp_pm_rm_subflow(struct mptcp_sock *msk, 1086 const struct mptcp_rm_list *rm_list); 1087 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 1088 const struct mptcp_rm_list *rm_list); 1089 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 1090 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 1091 int mptcp_pm_mp_prio_send_ack(struct mptcp_sock *msk, 1092 struct mptcp_addr_info *addr, 1093 struct mptcp_addr_info *rem, 1094 u8 bkup); 1095 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 1096 const struct mptcp_addr_info *addr); 1097 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 1098 struct mptcp_pm_add_entry * 1099 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 1100 const struct mptcp_addr_info *addr, bool check_id); 1101 bool mptcp_lookup_subflow_by_saddr(const struct list_head *list, 1102 const struct mptcp_addr_info *saddr); 1103 bool mptcp_remove_anno_list_by_saddr(struct mptcp_sock *msk, 1104 const struct mptcp_addr_info *addr); 1105 int mptcp_pm_nl_set_flags(struct mptcp_pm_addr_entry *local, 1106 struct genl_info *info); 1107 int mptcp_userspace_pm_set_flags(struct mptcp_pm_addr_entry *local, 1108 struct genl_info *info); 1109 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 1110 const struct mptcp_addr_info *addr, 1111 bool echo); 1112 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 1113 void mptcp_pm_remove_addr_entry(struct mptcp_sock *msk, 1114 struct mptcp_pm_addr_entry *entry); 1115 1116 /* the default path manager, used in mptcp_pm_unregister */ 1117 extern struct mptcp_pm_ops mptcp_pm_kernel; 1118 1119 struct mptcp_pm_ops *mptcp_pm_find(const char *name); 1120 int mptcp_pm_register(struct mptcp_pm_ops *pm_ops); 1121 void mptcp_pm_unregister(struct mptcp_pm_ops *pm_ops); 1122 int mptcp_pm_validate(struct mptcp_pm_ops *pm_ops); 1123 void mptcp_pm_get_available(char *buf, size_t maxlen); 1124 1125 void mptcp_userspace_pm_free_local_addr_list(struct mptcp_sock *msk); 1126 1127 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 1128 const struct sock *ssk, gfp_t gfp); 1129 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 1130 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 1131 void mptcp_event_pm_listener(const struct sock *ssk, 1132 enum mptcp_event_type event); 1133 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 1134 1135 void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 1136 struct request_sock *req); 1137 int mptcp_pm_genl_fill_addr(struct sk_buff *msg, 1138 struct netlink_callback *cb, 1139 struct mptcp_pm_addr_entry *entry); 1140 1141 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 1142 { 1143 return READ_ONCE(msk->pm.addr_signal) & 1144 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 1145 } 1146 1147 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 1148 { 1149 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 1150 } 1151 1152 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 1153 { 1154 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 1155 } 1156 1157 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 1158 { 1159 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 1160 } 1161 1162 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 1163 { 1164 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 1165 } 1166 1167 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 1168 { 1169 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 1170 } 1171 1172 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 1173 { 1174 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 1175 1176 if (family == AF_INET6) 1177 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 1178 if (!echo) 1179 len += MPTCPOPT_THMAC_LEN; 1180 /* account for 2 trailing 'nop' options */ 1181 if (port) 1182 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 1183 1184 return len; 1185 } 1186 1187 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 1188 { 1189 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 1190 return -EINVAL; 1191 1192 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 1193 } 1194 1195 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 1196 unsigned int opt_size, unsigned int remaining, 1197 struct mptcp_addr_info *addr, bool *echo, 1198 bool *drop_other_suboptions); 1199 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 1200 struct mptcp_rm_list *rm_list); 1201 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 1202 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, 1203 struct mptcp_pm_addr_entry *skc); 1204 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, 1205 struct mptcp_pm_addr_entry *skc); 1206 bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc); 1207 bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1208 bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 1209 int mptcp_pm_nl_dump_addr(struct sk_buff *msg, 1210 struct netlink_callback *cb); 1211 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, 1212 struct netlink_callback *cb); 1213 int mptcp_pm_nl_get_addr(u8 id, struct mptcp_pm_addr_entry *addr, 1214 struct genl_info *info); 1215 int mptcp_userspace_pm_get_addr(u8 id, struct mptcp_pm_addr_entry *addr, 1216 struct genl_info *info); 1217 1218 static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow) 1219 { 1220 int local_id = READ_ONCE(subflow->local_id); 1221 1222 if (local_id < 0) 1223 return 0; 1224 return local_id; 1225 } 1226 1227 void __init mptcp_pm_kernel_register(void); 1228 void __init mptcp_pm_userspace_register(void); 1229 void __init mptcp_pm_nl_init(void); 1230 void mptcp_pm_worker(struct mptcp_sock *msk); 1231 void __mptcp_pm_kernel_worker(struct mptcp_sock *msk); 1232 u8 mptcp_pm_get_endp_signal_max(const struct mptcp_sock *msk); 1233 u8 mptcp_pm_get_endp_subflow_max(const struct mptcp_sock *msk); 1234 u8 mptcp_pm_get_endp_laminar_max(const struct mptcp_sock *msk); 1235 u8 mptcp_pm_get_endp_fullmesh_max(const struct mptcp_sock *msk); 1236 u8 mptcp_pm_get_limit_add_addr_accepted(const struct mptcp_sock *msk); 1237 u8 mptcp_pm_get_limit_extra_subflows(const struct mptcp_sock *msk); 1238 1239 /* called under PM lock */ 1240 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 1241 { 1242 if (--msk->pm.extra_subflows < mptcp_pm_get_limit_extra_subflows(msk)) 1243 WRITE_ONCE(msk->pm.accept_subflow, true); 1244 } 1245 1246 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 1247 { 1248 spin_lock_bh(&msk->pm.lock); 1249 __mptcp_pm_close_subflow(msk); 1250 spin_unlock_bh(&msk->pm.lock); 1251 } 1252 1253 static inline bool mptcp_pm_add_addr_c_flag_case(struct mptcp_sock *msk) 1254 { 1255 return READ_ONCE(msk->pm.remote_deny_join_id0) && 1256 msk->pm.local_addr_used == 0 && 1257 mptcp_pm_get_limit_add_addr_accepted(msk) == 0 && 1258 msk->pm.extra_subflows < mptcp_pm_get_limit_extra_subflows(msk); 1259 } 1260 1261 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 1262 1263 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 1264 { 1265 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 1266 } 1267 1268 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 1269 1270 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 1271 { 1272 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1273 } 1274 1275 static inline bool mptcp_check_fallback(const struct sock *sk) 1276 { 1277 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1278 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1279 1280 return __mptcp_check_fallback(msk); 1281 } 1282 1283 static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk) 1284 { 1285 struct sock *ssk = READ_ONCE(msk->first); 1286 1287 return ssk && ((1 << inet_sk_state_load(ssk)) & 1288 (TCPF_ESTABLISHED | TCPF_SYN_SENT | 1289 TCPF_SYN_RECV | TCPF_LISTEN)); 1290 } 1291 1292 bool __mptcp_try_fallback(struct mptcp_sock *msk, int fb_mib); 1293 1294 static inline bool mptcp_try_fallback(struct sock *ssk, int fb_mib) 1295 { 1296 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1297 struct sock *sk = subflow->conn; 1298 struct mptcp_sock *msk; 1299 1300 msk = mptcp_sk(sk); 1301 if (!__mptcp_try_fallback(msk, fb_mib)) 1302 return false; 1303 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1304 gfp_t saved_allocation = ssk->sk_allocation; 1305 1306 /* we are in a atomic (BH) scope, override ssk default for data 1307 * fin allocation 1308 */ 1309 ssk->sk_allocation = GFP_ATOMIC; 1310 ssk->sk_shutdown |= SEND_SHUTDOWN; 1311 tcp_shutdown(ssk, SEND_SHUTDOWN); 1312 ssk->sk_allocation = saved_allocation; 1313 } 1314 return true; 1315 } 1316 1317 static inline void mptcp_early_fallback(struct mptcp_sock *msk, 1318 struct mptcp_subflow_context *subflow, 1319 int fb_mib) 1320 { 1321 subflow->request_mptcp = 0; 1322 WARN_ON_ONCE(!__mptcp_try_fallback(msk, fb_mib)); 1323 } 1324 1325 static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 1326 { 1327 struct mptcp_ext *mpext; 1328 1329 mpext = skb ? mptcp_get_ext(skb) : NULL; 1330 if (mpext && mpext->infinite_map) 1331 return true; 1332 1333 return false; 1334 } 1335 1336 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 1337 { 1338 return (subflow->request_mptcp || subflow->request_join); 1339 } 1340 1341 static inline bool subflow_simultaneous_connect(struct sock *sk) 1342 { 1343 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1344 1345 /* Note that the sk state implies !subflow->conn_finished. */ 1346 return sk->sk_state == TCP_SYN_RECV && is_active_ssk(subflow); 1347 } 1348 1349 #ifdef CONFIG_SYN_COOKIES 1350 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1351 struct sk_buff *skb); 1352 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1353 struct sk_buff *skb); 1354 void __init mptcp_join_cookie_init(void); 1355 #else 1356 static inline void 1357 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 1358 struct sk_buff *skb) {} 1359 static inline bool 1360 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 1361 struct sk_buff *skb) 1362 { 1363 return false; 1364 } 1365 1366 static inline void mptcp_join_cookie_init(void) {} 1367 #endif 1368 1369 #endif /* __MPTCP_PROTOCOL_H */ 1370