1// SPDX-License-Identifier: GPL-2.0 2/* Multipath TCP 3 * 4 * Copyright (c) 2021, Red Hat. 5 */ 6 7#define pr_fmt(fmt) "MPTCP: " fmt 8 9#include <linux/kernel.h> 10#include <linux/module.h> 11#include <net/sock.h> 12#include <net/protocol.h> 13#include <net/tcp.h> 14#include <net/mptcp.h> 15#include "protocol.h" 16 17#define MIN_INFO_OPTLEN_SIZE 16 18#define MIN_FULL_INFO_OPTLEN_SIZE 40 19 20static struct sock *__mptcp_tcp_fallback(struct mptcp_sock *msk) 21{ 22 msk_owned_by_me(msk); 23 24 if (likely(!__mptcp_check_fallback(msk))) 25 return NULL; 26 27 return msk->first; 28} 29 30static u32 sockopt_seq_reset(const struct sock *sk) 31{ 32 sock_owned_by_me(sk); 33 34 /* Highbits contain state. Allows to distinguish sockopt_seq 35 * of listener and established: 36 * s0 = new_listener() 37 * sockopt(s0) - seq is 1 38 * s1 = accept(s0) - s1 inherits seq 1 if listener sk (s0) 39 * sockopt(s0) - seq increments to 2 on s0 40 * sockopt(s1) // seq increments to 2 on s1 (different option) 41 * new ssk completes join, inherits options from s0 // seq 2 42 * Needs sync from mptcp join logic, but ssk->seq == msk->seq 43 * 44 * Set High order bits to sk_state so ssk->seq == msk->seq test 45 * will fail. 46 */ 47 48 return (u32)sk->sk_state << 24u; 49} 50 51static void sockopt_seq_inc(struct mptcp_sock *msk) 52{ 53 u32 seq = (msk->setsockopt_seq + 1) & 0x00ffffff; 54 55 msk->setsockopt_seq = sockopt_seq_reset((struct sock *)msk) + seq; 56} 57 58static int mptcp_get_int_option(struct mptcp_sock *msk, sockptr_t optval, 59 unsigned int optlen, int *val) 60{ 61 if (optlen < sizeof(int)) 62 return -EINVAL; 63 64 if (copy_from_sockptr(val, optval, sizeof(*val))) 65 return -EFAULT; 66 67 return 0; 68} 69 70static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, int val) 71{ 72 struct mptcp_subflow_context *subflow; 73 struct sock *sk = (struct sock *)msk; 74 75 lock_sock(sk); 76 sockopt_seq_inc(msk); 77 78 mptcp_for_each_subflow(msk, subflow) { 79 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 80 bool slow = lock_sock_fast(ssk); 81 82 switch (optname) { 83 case SO_DEBUG: 84 sock_valbool_flag(ssk, SOCK_DBG, !!val); 85 break; 86 case SO_KEEPALIVE: 87 if (ssk->sk_prot->keepalive) 88 ssk->sk_prot->keepalive(ssk, !!val); 89 sock_valbool_flag(ssk, SOCK_KEEPOPEN, !!val); 90 break; 91 case SO_PRIORITY: 92 ssk->sk_priority = val; 93 break; 94 case SO_SNDBUF: 95 case SO_SNDBUFFORCE: 96 ssk->sk_userlocks |= SOCK_SNDBUF_LOCK; 97 WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); 98 mptcp_subflow_ctx(ssk)->cached_sndbuf = sk->sk_sndbuf; 99 break; 100 case SO_RCVBUF: 101 case SO_RCVBUFFORCE: 102 ssk->sk_userlocks |= SOCK_RCVBUF_LOCK; 103 WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); 104 break; 105 case SO_MARK: 106 if (READ_ONCE(ssk->sk_mark) != sk->sk_mark) { 107 WRITE_ONCE(ssk->sk_mark, sk->sk_mark); 108 sk_dst_reset(ssk); 109 } 110 break; 111 case SO_INCOMING_CPU: 112 WRITE_ONCE(ssk->sk_incoming_cpu, val); 113 break; 114 } 115 116 subflow->setsockopt_seq = msk->setsockopt_seq; 117 unlock_sock_fast(ssk, slow); 118 } 119 120 release_sock(sk); 121} 122 123static int mptcp_sol_socket_intval(struct mptcp_sock *msk, int optname, int val) 124{ 125 sockptr_t optval = KERNEL_SOCKPTR(&val); 126 struct sock *sk = (struct sock *)msk; 127 int ret; 128 129 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 130 optval, sizeof(val)); 131 if (ret) 132 return ret; 133 134 mptcp_sol_socket_sync_intval(msk, optname, val); 135 return 0; 136} 137 138static void mptcp_so_incoming_cpu(struct mptcp_sock *msk, int val) 139{ 140 struct sock *sk = (struct sock *)msk; 141 142 WRITE_ONCE(sk->sk_incoming_cpu, val); 143 144 mptcp_sol_socket_sync_intval(msk, SO_INCOMING_CPU, val); 145} 146 147static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optname, int val) 148{ 149 sockptr_t optval = KERNEL_SOCKPTR(&val); 150 struct mptcp_subflow_context *subflow; 151 struct sock *sk = (struct sock *)msk; 152 int ret; 153 154 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 155 optval, sizeof(val)); 156 if (ret) 157 return ret; 158 159 lock_sock(sk); 160 mptcp_for_each_subflow(msk, subflow) { 161 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 162 bool slow = lock_sock_fast(ssk); 163 164 sock_set_timestamp(sk, optname, !!val); 165 unlock_sock_fast(ssk, slow); 166 } 167 168 release_sock(sk); 169 return 0; 170} 171 172static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname, 173 sockptr_t optval, 174 unsigned int optlen) 175{ 176 int val, ret; 177 178 ret = mptcp_get_int_option(msk, optval, optlen, &val); 179 if (ret) 180 return ret; 181 182 switch (optname) { 183 case SO_KEEPALIVE: 184 mptcp_sol_socket_sync_intval(msk, optname, val); 185 return 0; 186 case SO_DEBUG: 187 case SO_MARK: 188 case SO_PRIORITY: 189 case SO_SNDBUF: 190 case SO_SNDBUFFORCE: 191 case SO_RCVBUF: 192 case SO_RCVBUFFORCE: 193 return mptcp_sol_socket_intval(msk, optname, val); 194 case SO_INCOMING_CPU: 195 mptcp_so_incoming_cpu(msk, val); 196 return 0; 197 case SO_TIMESTAMP_OLD: 198 case SO_TIMESTAMP_NEW: 199 case SO_TIMESTAMPNS_OLD: 200 case SO_TIMESTAMPNS_NEW: 201 return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val); 202 } 203 204 return -ENOPROTOOPT; 205} 206 207static int mptcp_setsockopt_sol_socket_timestamping(struct mptcp_sock *msk, 208 int optname, 209 sockptr_t optval, 210 unsigned int optlen) 211{ 212 struct mptcp_subflow_context *subflow; 213 struct sock *sk = (struct sock *)msk; 214 struct so_timestamping timestamping; 215 int ret; 216 217 if (optlen == sizeof(timestamping)) { 218 if (copy_from_sockptr(×tamping, optval, 219 sizeof(timestamping))) 220 return -EFAULT; 221 } else if (optlen == sizeof(int)) { 222 memset(×tamping, 0, sizeof(timestamping)); 223 224 if (copy_from_sockptr(×tamping.flags, optval, sizeof(int))) 225 return -EFAULT; 226 } else { 227 return -EINVAL; 228 } 229 230 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 231 KERNEL_SOCKPTR(×tamping), 232 sizeof(timestamping)); 233 if (ret) 234 return ret; 235 236 lock_sock(sk); 237 238 mptcp_for_each_subflow(msk, subflow) { 239 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 240 bool slow = lock_sock_fast(ssk); 241 242 sock_set_timestamping(sk, optname, timestamping); 243 unlock_sock_fast(ssk, slow); 244 } 245 246 release_sock(sk); 247 248 return 0; 249} 250 251static int mptcp_setsockopt_sol_socket_linger(struct mptcp_sock *msk, sockptr_t optval, 252 unsigned int optlen) 253{ 254 struct mptcp_subflow_context *subflow; 255 struct sock *sk = (struct sock *)msk; 256 struct linger ling; 257 sockptr_t kopt; 258 int ret; 259 260 if (optlen < sizeof(ling)) 261 return -EINVAL; 262 263 if (copy_from_sockptr(&ling, optval, sizeof(ling))) 264 return -EFAULT; 265 266 kopt = KERNEL_SOCKPTR(&ling); 267 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, SO_LINGER, kopt, sizeof(ling)); 268 if (ret) 269 return ret; 270 271 lock_sock(sk); 272 sockopt_seq_inc(msk); 273 mptcp_for_each_subflow(msk, subflow) { 274 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 275 bool slow = lock_sock_fast(ssk); 276 277 if (!ling.l_onoff) { 278 sock_reset_flag(ssk, SOCK_LINGER); 279 } else { 280 ssk->sk_lingertime = sk->sk_lingertime; 281 sock_set_flag(ssk, SOCK_LINGER); 282 } 283 284 subflow->setsockopt_seq = msk->setsockopt_seq; 285 unlock_sock_fast(ssk, slow); 286 } 287 288 release_sock(sk); 289 return 0; 290} 291 292static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname, 293 sockptr_t optval, unsigned int optlen) 294{ 295 struct sock *sk = (struct sock *)msk; 296 struct sock *ssk; 297 int ret; 298 299 switch (optname) { 300 case SO_REUSEPORT: 301 case SO_REUSEADDR: 302 case SO_BINDTODEVICE: 303 case SO_BINDTOIFINDEX: 304 lock_sock(sk); 305 ssk = __mptcp_nmpc_sk(msk); 306 if (IS_ERR(ssk)) { 307 release_sock(sk); 308 return PTR_ERR(ssk); 309 } 310 311 ret = sk_setsockopt(ssk, SOL_SOCKET, optname, optval, optlen); 312 if (ret == 0) { 313 if (optname == SO_REUSEPORT) 314 sk->sk_reuseport = ssk->sk_reuseport; 315 else if (optname == SO_REUSEADDR) 316 sk->sk_reuse = ssk->sk_reuse; 317 else if (optname == SO_BINDTODEVICE) 318 sk->sk_bound_dev_if = ssk->sk_bound_dev_if; 319 else if (optname == SO_BINDTOIFINDEX) 320 sk->sk_bound_dev_if = ssk->sk_bound_dev_if; 321 } 322 release_sock(sk); 323 return ret; 324 case SO_KEEPALIVE: 325 case SO_PRIORITY: 326 case SO_SNDBUF: 327 case SO_SNDBUFFORCE: 328 case SO_RCVBUF: 329 case SO_RCVBUFFORCE: 330 case SO_MARK: 331 case SO_INCOMING_CPU: 332 case SO_DEBUG: 333 case SO_TIMESTAMP_OLD: 334 case SO_TIMESTAMP_NEW: 335 case SO_TIMESTAMPNS_OLD: 336 case SO_TIMESTAMPNS_NEW: 337 return mptcp_setsockopt_sol_socket_int(msk, optname, optval, 338 optlen); 339 case SO_TIMESTAMPING_OLD: 340 case SO_TIMESTAMPING_NEW: 341 return mptcp_setsockopt_sol_socket_timestamping(msk, optname, 342 optval, optlen); 343 case SO_LINGER: 344 return mptcp_setsockopt_sol_socket_linger(msk, optval, optlen); 345 case SO_RCVLOWAT: 346 case SO_RCVTIMEO_OLD: 347 case SO_RCVTIMEO_NEW: 348 case SO_SNDTIMEO_OLD: 349 case SO_SNDTIMEO_NEW: 350 case SO_BUSY_POLL: 351 case SO_PREFER_BUSY_POLL: 352 case SO_BUSY_POLL_BUDGET: 353 /* No need to copy: only relevant for msk */ 354 return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen); 355 case SO_NO_CHECK: 356 case SO_DONTROUTE: 357 case SO_BROADCAST: 358 case SO_BSDCOMPAT: 359 case SO_PASSCRED: 360 case SO_PASSPIDFD: 361 case SO_PASSSEC: 362 case SO_RXQ_OVFL: 363 case SO_WIFI_STATUS: 364 case SO_NOFCS: 365 case SO_SELECT_ERR_QUEUE: 366 return 0; 367 } 368 369 /* SO_OOBINLINE is not supported, let's avoid the related mess 370 * SO_ATTACH_FILTER, SO_ATTACH_BPF, SO_ATTACH_REUSEPORT_CBPF, 371 * SO_DETACH_REUSEPORT_BPF, SO_DETACH_FILTER, SO_LOCK_FILTER, 372 * we must be careful with subflows 373 * 374 * SO_ATTACH_REUSEPORT_EBPF is not supported, at it checks 375 * explicitly the sk_protocol field 376 * 377 * SO_PEEK_OFF is unsupported, as it is for plain TCP 378 * SO_MAX_PACING_RATE is unsupported, we must be careful with subflows 379 * SO_CNX_ADVICE is currently unsupported, could possibly be relevant, 380 * but likely needs careful design 381 * 382 * SO_ZEROCOPY is currently unsupported, TODO in sndmsg 383 * SO_TXTIME is currently unsupported 384 */ 385 386 return -EOPNOTSUPP; 387} 388 389static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname, 390 sockptr_t optval, unsigned int optlen) 391{ 392 struct sock *sk = (struct sock *)msk; 393 int ret = -EOPNOTSUPP; 394 struct sock *ssk; 395 396 switch (optname) { 397 case IPV6_V6ONLY: 398 case IPV6_TRANSPARENT: 399 case IPV6_FREEBIND: 400 lock_sock(sk); 401 ssk = __mptcp_nmpc_sk(msk); 402 if (IS_ERR(ssk)) { 403 release_sock(sk); 404 return PTR_ERR(ssk); 405 } 406 407 ret = tcp_setsockopt(ssk, SOL_IPV6, optname, optval, optlen); 408 if (ret != 0) { 409 release_sock(sk); 410 return ret; 411 } 412 413 sockopt_seq_inc(msk); 414 415 switch (optname) { 416 case IPV6_V6ONLY: 417 sk->sk_ipv6only = ssk->sk_ipv6only; 418 break; 419 case IPV6_TRANSPARENT: 420 inet_assign_bit(TRANSPARENT, sk, 421 inet_test_bit(TRANSPARENT, ssk)); 422 break; 423 case IPV6_FREEBIND: 424 inet_assign_bit(FREEBIND, sk, 425 inet_test_bit(FREEBIND, ssk)); 426 break; 427 } 428 429 release_sock(sk); 430 break; 431 } 432 433 return ret; 434} 435 436static bool mptcp_supported_sockopt(int level, int optname) 437{ 438 if (level == SOL_IP) { 439 switch (optname) { 440 /* should work fine */ 441 case IP_FREEBIND: 442 case IP_TRANSPARENT: 443 444 /* the following are control cmsg related */ 445 case IP_PKTINFO: 446 case IP_RECVTTL: 447 case IP_RECVTOS: 448 case IP_RECVOPTS: 449 case IP_RETOPTS: 450 case IP_PASSSEC: 451 case IP_RECVORIGDSTADDR: 452 case IP_CHECKSUM: 453 case IP_RECVFRAGSIZE: 454 455 /* common stuff that need some love */ 456 case IP_TOS: 457 case IP_TTL: 458 case IP_BIND_ADDRESS_NO_PORT: 459 case IP_MTU_DISCOVER: 460 case IP_RECVERR: 461 462 /* possibly less common may deserve some love */ 463 case IP_MINTTL: 464 465 /* the following is apparently a no-op for plain TCP */ 466 case IP_RECVERR_RFC4884: 467 return true; 468 } 469 470 /* IP_OPTIONS is not supported, needs subflow care */ 471 /* IP_HDRINCL, IP_NODEFRAG are not supported, RAW specific */ 472 /* IP_MULTICAST_TTL, IP_MULTICAST_LOOP, IP_UNICAST_IF, 473 * IP_ADD_MEMBERSHIP, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP, 474 * IP_DROP_SOURCE_MEMBERSHIP, IP_BLOCK_SOURCE, IP_UNBLOCK_SOURCE, 475 * MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP MCAST_JOIN_SOURCE_GROUP, 476 * MCAST_LEAVE_SOURCE_GROUP, MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, 477 * MCAST_MSFILTER, IP_MULTICAST_ALL are not supported, better not deal 478 * with mcast stuff 479 */ 480 /* IP_IPSEC_POLICY, IP_XFRM_POLICY are nut supported, unrelated here */ 481 return false; 482 } 483 if (level == SOL_IPV6) { 484 switch (optname) { 485 case IPV6_V6ONLY: 486 487 /* the following are control cmsg related */ 488 case IPV6_RECVPKTINFO: 489 case IPV6_2292PKTINFO: 490 case IPV6_RECVHOPLIMIT: 491 case IPV6_2292HOPLIMIT: 492 case IPV6_RECVRTHDR: 493 case IPV6_2292RTHDR: 494 case IPV6_RECVHOPOPTS: 495 case IPV6_2292HOPOPTS: 496 case IPV6_RECVDSTOPTS: 497 case IPV6_2292DSTOPTS: 498 case IPV6_RECVTCLASS: 499 case IPV6_FLOWINFO: 500 case IPV6_RECVPATHMTU: 501 case IPV6_RECVORIGDSTADDR: 502 case IPV6_RECVFRAGSIZE: 503 504 /* the following ones need some love but are quite common */ 505 case IPV6_TCLASS: 506 case IPV6_TRANSPARENT: 507 case IPV6_FREEBIND: 508 case IPV6_PKTINFO: 509 case IPV6_2292PKTOPTIONS: 510 case IPV6_UNICAST_HOPS: 511 case IPV6_MTU_DISCOVER: 512 case IPV6_MTU: 513 case IPV6_RECVERR: 514 case IPV6_FLOWINFO_SEND: 515 case IPV6_FLOWLABEL_MGR: 516 case IPV6_MINHOPCOUNT: 517 case IPV6_DONTFRAG: 518 case IPV6_AUTOFLOWLABEL: 519 520 /* the following one is a no-op for plain TCP */ 521 case IPV6_RECVERR_RFC4884: 522 return true; 523 } 524 525 /* IPV6_HOPOPTS, IPV6_RTHDRDSTOPTS, IPV6_RTHDR, IPV6_DSTOPTS are 526 * not supported 527 */ 528 /* IPV6_MULTICAST_HOPS, IPV6_MULTICAST_LOOP, IPV6_UNICAST_IF, 529 * IPV6_MULTICAST_IF, IPV6_ADDRFORM, 530 * IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST, 531 * IPV6_LEAVE_ANYCAST, IPV6_MULTICAST_ALL, MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP, 532 * MCAST_JOIN_SOURCE_GROUP, MCAST_LEAVE_SOURCE_GROUP, 533 * MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, MCAST_MSFILTER 534 * are not supported better not deal with mcast 535 */ 536 /* IPV6_ROUTER_ALERT, IPV6_ROUTER_ALERT_ISOLATE are not supported, since are evil */ 537 538 /* IPV6_IPSEC_POLICY, IPV6_XFRM_POLICY are not supported */ 539 /* IPV6_ADDR_PREFERENCES is not supported, we must be careful with subflows */ 540 return false; 541 } 542 if (level == SOL_TCP) { 543 switch (optname) { 544 /* the following are no-op or should work just fine */ 545 case TCP_THIN_DUPACK: 546 case TCP_DEFER_ACCEPT: 547 548 /* the following need some love */ 549 case TCP_MAXSEG: 550 case TCP_NODELAY: 551 case TCP_THIN_LINEAR_TIMEOUTS: 552 case TCP_CONGESTION: 553 case TCP_CORK: 554 case TCP_KEEPIDLE: 555 case TCP_KEEPINTVL: 556 case TCP_KEEPCNT: 557 case TCP_SYNCNT: 558 case TCP_SAVE_SYN: 559 case TCP_LINGER2: 560 case TCP_WINDOW_CLAMP: 561 case TCP_QUICKACK: 562 case TCP_USER_TIMEOUT: 563 case TCP_TIMESTAMP: 564 case TCP_NOTSENT_LOWAT: 565 case TCP_TX_DELAY: 566 case TCP_INQ: 567 case TCP_FASTOPEN: 568 case TCP_FASTOPEN_CONNECT: 569 case TCP_FASTOPEN_KEY: 570 case TCP_FASTOPEN_NO_COOKIE: 571 return true; 572 } 573 574 /* TCP_MD5SIG, TCP_MD5SIG_EXT are not supported, MD5 is not compatible with MPTCP */ 575 576 /* TCP_REPAIR, TCP_REPAIR_QUEUE, TCP_QUEUE_SEQ, TCP_REPAIR_OPTIONS, 577 * TCP_REPAIR_WINDOW are not supported, better avoid this mess 578 */ 579 } 580 return false; 581} 582 583static int mptcp_setsockopt_sol_tcp_congestion(struct mptcp_sock *msk, sockptr_t optval, 584 unsigned int optlen) 585{ 586 struct mptcp_subflow_context *subflow; 587 struct sock *sk = (struct sock *)msk; 588 char name[TCP_CA_NAME_MAX]; 589 bool cap_net_admin; 590 int ret; 591 592 if (optlen < 1) 593 return -EINVAL; 594 595 ret = strncpy_from_sockptr(name, optval, 596 min_t(long, TCP_CA_NAME_MAX - 1, optlen)); 597 if (ret < 0) 598 return -EFAULT; 599 600 name[ret] = 0; 601 602 cap_net_admin = ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN); 603 604 ret = 0; 605 lock_sock(sk); 606 sockopt_seq_inc(msk); 607 mptcp_for_each_subflow(msk, subflow) { 608 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 609 int err; 610 611 lock_sock(ssk); 612 err = tcp_set_congestion_control(ssk, name, true, cap_net_admin); 613 if (err < 0 && ret == 0) 614 ret = err; 615 subflow->setsockopt_seq = msk->setsockopt_seq; 616 release_sock(ssk); 617 } 618 619 if (ret == 0) 620 strcpy(msk->ca_name, name); 621 622 release_sock(sk); 623 return ret; 624} 625 626static int mptcp_setsockopt_sol_tcp_cork(struct mptcp_sock *msk, sockptr_t optval, 627 unsigned int optlen) 628{ 629 struct mptcp_subflow_context *subflow; 630 struct sock *sk = (struct sock *)msk; 631 int val; 632 633 if (optlen < sizeof(int)) 634 return -EINVAL; 635 636 if (copy_from_sockptr(&val, optval, sizeof(val))) 637 return -EFAULT; 638 639 lock_sock(sk); 640 sockopt_seq_inc(msk); 641 msk->cork = !!val; 642 mptcp_for_each_subflow(msk, subflow) { 643 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 644 645 lock_sock(ssk); 646 __tcp_sock_set_cork(ssk, !!val); 647 release_sock(ssk); 648 } 649 if (!val) 650 mptcp_check_and_set_pending(sk); 651 release_sock(sk); 652 653 return 0; 654} 655 656static int mptcp_setsockopt_sol_tcp_nodelay(struct mptcp_sock *msk, sockptr_t optval, 657 unsigned int optlen) 658{ 659 struct mptcp_subflow_context *subflow; 660 struct sock *sk = (struct sock *)msk; 661 int val; 662 663 if (optlen < sizeof(int)) 664 return -EINVAL; 665 666 if (copy_from_sockptr(&val, optval, sizeof(val))) 667 return -EFAULT; 668 669 lock_sock(sk); 670 sockopt_seq_inc(msk); 671 msk->nodelay = !!val; 672 mptcp_for_each_subflow(msk, subflow) { 673 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 674 675 lock_sock(ssk); 676 __tcp_sock_set_nodelay(ssk, !!val); 677 release_sock(ssk); 678 } 679 if (val) 680 mptcp_check_and_set_pending(sk); 681 release_sock(sk); 682 683 return 0; 684} 685 686static int mptcp_setsockopt_sol_ip_set_transparent(struct mptcp_sock *msk, int optname, 687 sockptr_t optval, unsigned int optlen) 688{ 689 struct sock *sk = (struct sock *)msk; 690 struct sock *ssk; 691 int err; 692 693 err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen); 694 if (err != 0) 695 return err; 696 697 lock_sock(sk); 698 699 ssk = __mptcp_nmpc_sk(msk); 700 if (IS_ERR(ssk)) { 701 release_sock(sk); 702 return PTR_ERR(ssk); 703 } 704 705 switch (optname) { 706 case IP_FREEBIND: 707 inet_assign_bit(FREEBIND, ssk, inet_test_bit(FREEBIND, sk)); 708 break; 709 case IP_TRANSPARENT: 710 inet_assign_bit(TRANSPARENT, ssk, 711 inet_test_bit(TRANSPARENT, sk)); 712 break; 713 default: 714 release_sock(sk); 715 WARN_ON_ONCE(1); 716 return -EOPNOTSUPP; 717 } 718 719 sockopt_seq_inc(msk); 720 release_sock(sk); 721 return 0; 722} 723 724static int mptcp_setsockopt_v4_set_tos(struct mptcp_sock *msk, int optname, 725 sockptr_t optval, unsigned int optlen) 726{ 727 struct mptcp_subflow_context *subflow; 728 struct sock *sk = (struct sock *)msk; 729 int err, val; 730 731 err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen); 732 733 if (err != 0) 734 return err; 735 736 lock_sock(sk); 737 sockopt_seq_inc(msk); 738 val = inet_sk(sk)->tos; 739 mptcp_for_each_subflow(msk, subflow) { 740 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 741 bool slow; 742 743 slow = lock_sock_fast(ssk); 744 __ip_sock_set_tos(ssk, val); 745 unlock_sock_fast(ssk, slow); 746 } 747 release_sock(sk); 748 749 return 0; 750} 751 752static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname, 753 sockptr_t optval, unsigned int optlen) 754{ 755 switch (optname) { 756 case IP_FREEBIND: 757 case IP_TRANSPARENT: 758 return mptcp_setsockopt_sol_ip_set_transparent(msk, optname, optval, optlen); 759 case IP_TOS: 760 return mptcp_setsockopt_v4_set_tos(msk, optname, optval, optlen); 761 } 762 763 return -EOPNOTSUPP; 764} 765 766static int mptcp_setsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, 767 sockptr_t optval, unsigned int optlen) 768{ 769 struct sock *sk = (struct sock *)msk; 770 struct sock *ssk; 771 int ret; 772 773 /* Limit to first subflow, before the connection establishment */ 774 lock_sock(sk); 775 ssk = __mptcp_nmpc_sk(msk); 776 if (IS_ERR(ssk)) { 777 ret = PTR_ERR(ssk); 778 goto unlock; 779 } 780 781 ret = tcp_setsockopt(ssk, level, optname, optval, optlen); 782 783unlock: 784 release_sock(sk); 785 return ret; 786} 787 788static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 789 sockptr_t optval, unsigned int optlen) 790{ 791 struct sock *sk = (void *)msk; 792 int ret, val; 793 794 switch (optname) { 795 case TCP_INQ: 796 ret = mptcp_get_int_option(msk, optval, optlen, &val); 797 if (ret) 798 return ret; 799 if (val < 0 || val > 1) 800 return -EINVAL; 801 802 lock_sock(sk); 803 msk->recvmsg_inq = !!val; 804 release_sock(sk); 805 return 0; 806 case TCP_ULP: 807 return -EOPNOTSUPP; 808 case TCP_CONGESTION: 809 return mptcp_setsockopt_sol_tcp_congestion(msk, optval, optlen); 810 case TCP_CORK: 811 return mptcp_setsockopt_sol_tcp_cork(msk, optval, optlen); 812 case TCP_NODELAY: 813 return mptcp_setsockopt_sol_tcp_nodelay(msk, optval, optlen); 814 case TCP_DEFER_ACCEPT: 815 /* See tcp.c: TCP_DEFER_ACCEPT does not fail */ 816 mptcp_setsockopt_first_sf_only(msk, SOL_TCP, optname, optval, optlen); 817 return 0; 818 case TCP_FASTOPEN: 819 case TCP_FASTOPEN_CONNECT: 820 case TCP_FASTOPEN_KEY: 821 case TCP_FASTOPEN_NO_COOKIE: 822 return mptcp_setsockopt_first_sf_only(msk, SOL_TCP, optname, 823 optval, optlen); 824 } 825 826 return -EOPNOTSUPP; 827} 828 829int mptcp_setsockopt(struct sock *sk, int level, int optname, 830 sockptr_t optval, unsigned int optlen) 831{ 832 struct mptcp_sock *msk = mptcp_sk(sk); 833 struct sock *ssk; 834 835 pr_debug("msk=%p", msk); 836 837 if (level == SOL_SOCKET) 838 return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen); 839 840 if (!mptcp_supported_sockopt(level, optname)) 841 return -ENOPROTOOPT; 842 843 /* @@ the meaning of setsockopt() when the socket is connected and 844 * there are multiple subflows is not yet defined. It is up to the 845 * MPTCP-level socket to configure the subflows until the subflow 846 * is in TCP fallback, when TCP socket options are passed through 847 * to the one remaining subflow. 848 */ 849 lock_sock(sk); 850 ssk = __mptcp_tcp_fallback(msk); 851 release_sock(sk); 852 if (ssk) 853 return tcp_setsockopt(ssk, level, optname, optval, optlen); 854 855 if (level == SOL_IP) 856 return mptcp_setsockopt_v4(msk, optname, optval, optlen); 857 858 if (level == SOL_IPV6) 859 return mptcp_setsockopt_v6(msk, optname, optval, optlen); 860 861 if (level == SOL_TCP) 862 return mptcp_setsockopt_sol_tcp(msk, optname, optval, optlen); 863 864 return -EOPNOTSUPP; 865} 866 867static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, 868 char __user *optval, int __user *optlen) 869{ 870 struct sock *sk = (struct sock *)msk; 871 struct sock *ssk; 872 int ret; 873 874 lock_sock(sk); 875 ssk = msk->first; 876 if (ssk) { 877 ret = tcp_getsockopt(ssk, level, optname, optval, optlen); 878 goto out; 879 } 880 881 ssk = __mptcp_nmpc_sk(msk); 882 if (IS_ERR(ssk)) { 883 ret = PTR_ERR(ssk); 884 goto out; 885 } 886 887 ret = tcp_getsockopt(ssk, level, optname, optval, optlen); 888 889out: 890 release_sock(sk); 891 return ret; 892} 893 894void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info) 895{ 896 struct sock *sk = (struct sock *)msk; 897 u32 flags = 0; 898 bool slow; 899 900 memset(info, 0, sizeof(*info)); 901 902 info->mptcpi_subflows = READ_ONCE(msk->pm.subflows); 903 info->mptcpi_add_addr_signal = READ_ONCE(msk->pm.add_addr_signaled); 904 info->mptcpi_add_addr_accepted = READ_ONCE(msk->pm.add_addr_accepted); 905 info->mptcpi_local_addr_used = READ_ONCE(msk->pm.local_addr_used); 906 907 if (inet_sk_state_load(sk) == TCP_LISTEN) 908 return; 909 910 /* The following limits only make sense for the in-kernel PM */ 911 if (mptcp_pm_is_kernel(msk)) { 912 info->mptcpi_subflows_max = 913 mptcp_pm_get_subflows_max(msk); 914 info->mptcpi_add_addr_signal_max = 915 mptcp_pm_get_add_addr_signal_max(msk); 916 info->mptcpi_add_addr_accepted_max = 917 mptcp_pm_get_add_addr_accept_max(msk); 918 info->mptcpi_local_addr_max = 919 mptcp_pm_get_local_addr_max(msk); 920 } 921 922 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) 923 flags |= MPTCP_INFO_FLAG_FALLBACK; 924 if (READ_ONCE(msk->can_ack)) 925 flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED; 926 info->mptcpi_flags = flags; 927 mptcp_data_lock(sk); 928 info->mptcpi_snd_una = msk->snd_una; 929 info->mptcpi_rcv_nxt = msk->ack_seq; 930 info->mptcpi_bytes_acked = msk->bytes_acked; 931 mptcp_data_unlock(sk); 932 933 slow = lock_sock_fast(sk); 934 info->mptcpi_csum_enabled = msk->csum_enabled; 935 info->mptcpi_token = msk->token; 936 info->mptcpi_write_seq = msk->write_seq; 937 info->mptcpi_retransmits = inet_csk(sk)->icsk_retransmits; 938 info->mptcpi_bytes_sent = msk->bytes_sent; 939 info->mptcpi_bytes_received = msk->bytes_received; 940 info->mptcpi_bytes_retrans = msk->bytes_retrans; 941 unlock_sock_fast(sk, slow); 942} 943EXPORT_SYMBOL_GPL(mptcp_diag_fill_info); 944 945static int mptcp_getsockopt_info(struct mptcp_sock *msk, char __user *optval, int __user *optlen) 946{ 947 struct mptcp_info m_info; 948 int len; 949 950 if (get_user(len, optlen)) 951 return -EFAULT; 952 953 len = min_t(unsigned int, len, sizeof(struct mptcp_info)); 954 955 mptcp_diag_fill_info(msk, &m_info); 956 957 if (put_user(len, optlen)) 958 return -EFAULT; 959 960 if (copy_to_user(optval, &m_info, len)) 961 return -EFAULT; 962 963 return 0; 964} 965 966static int mptcp_put_subflow_data(struct mptcp_subflow_data *sfd, 967 char __user *optval, 968 u32 copied, 969 int __user *optlen) 970{ 971 u32 copylen = min_t(u32, sfd->size_subflow_data, sizeof(*sfd)); 972 973 if (copied) 974 copied += sfd->size_subflow_data; 975 else 976 copied = copylen; 977 978 if (put_user(copied, optlen)) 979 return -EFAULT; 980 981 if (copy_to_user(optval, sfd, copylen)) 982 return -EFAULT; 983 984 return 0; 985} 986 987static int mptcp_get_subflow_data(struct mptcp_subflow_data *sfd, 988 char __user *optval, 989 int __user *optlen) 990{ 991 int len, copylen; 992 993 if (get_user(len, optlen)) 994 return -EFAULT; 995 996 /* if mptcp_subflow_data size is changed, need to adjust 997 * this function to deal with programs using old version. 998 */ 999 BUILD_BUG_ON(sizeof(*sfd) != MIN_INFO_OPTLEN_SIZE); 1000 1001 if (len < MIN_INFO_OPTLEN_SIZE) 1002 return -EINVAL; 1003 1004 memset(sfd, 0, sizeof(*sfd)); 1005 1006 copylen = min_t(unsigned int, len, sizeof(*sfd)); 1007 if (copy_from_user(sfd, optval, copylen)) 1008 return -EFAULT; 1009 1010 /* size_subflow_data is u32, but len is signed */ 1011 if (sfd->size_subflow_data > INT_MAX || 1012 sfd->size_user > INT_MAX) 1013 return -EINVAL; 1014 1015 if (sfd->size_subflow_data < MIN_INFO_OPTLEN_SIZE || 1016 sfd->size_subflow_data > len) 1017 return -EINVAL; 1018 1019 if (sfd->num_subflows || sfd->size_kernel) 1020 return -EINVAL; 1021 1022 return len - sfd->size_subflow_data; 1023} 1024 1025static int mptcp_getsockopt_tcpinfo(struct mptcp_sock *msk, char __user *optval, 1026 int __user *optlen) 1027{ 1028 struct mptcp_subflow_context *subflow; 1029 struct sock *sk = (struct sock *)msk; 1030 unsigned int sfcount = 0, copied = 0; 1031 struct mptcp_subflow_data sfd; 1032 char __user *infoptr; 1033 int len; 1034 1035 len = mptcp_get_subflow_data(&sfd, optval, optlen); 1036 if (len < 0) 1037 return len; 1038 1039 sfd.size_kernel = sizeof(struct tcp_info); 1040 sfd.size_user = min_t(unsigned int, sfd.size_user, 1041 sizeof(struct tcp_info)); 1042 1043 infoptr = optval + sfd.size_subflow_data; 1044 1045 lock_sock(sk); 1046 1047 mptcp_for_each_subflow(msk, subflow) { 1048 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1049 1050 ++sfcount; 1051 1052 if (len && len >= sfd.size_user) { 1053 struct tcp_info info; 1054 1055 tcp_get_info(ssk, &info); 1056 1057 if (copy_to_user(infoptr, &info, sfd.size_user)) { 1058 release_sock(sk); 1059 return -EFAULT; 1060 } 1061 1062 infoptr += sfd.size_user; 1063 copied += sfd.size_user; 1064 len -= sfd.size_user; 1065 } 1066 } 1067 1068 release_sock(sk); 1069 1070 sfd.num_subflows = sfcount; 1071 1072 if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) 1073 return -EFAULT; 1074 1075 return 0; 1076} 1077 1078static void mptcp_get_sub_addrs(const struct sock *sk, struct mptcp_subflow_addrs *a) 1079{ 1080 const struct inet_sock *inet = inet_sk(sk); 1081 1082 memset(a, 0, sizeof(*a)); 1083 1084 if (sk->sk_family == AF_INET) { 1085 a->sin_local.sin_family = AF_INET; 1086 a->sin_local.sin_port = inet->inet_sport; 1087 a->sin_local.sin_addr.s_addr = inet->inet_rcv_saddr; 1088 1089 if (!a->sin_local.sin_addr.s_addr) 1090 a->sin_local.sin_addr.s_addr = inet->inet_saddr; 1091 1092 a->sin_remote.sin_family = AF_INET; 1093 a->sin_remote.sin_port = inet->inet_dport; 1094 a->sin_remote.sin_addr.s_addr = inet->inet_daddr; 1095#if IS_ENABLED(CONFIG_IPV6) 1096 } else if (sk->sk_family == AF_INET6) { 1097 const struct ipv6_pinfo *np = inet6_sk(sk); 1098 1099 if (WARN_ON_ONCE(!np)) 1100 return; 1101 1102 a->sin6_local.sin6_family = AF_INET6; 1103 a->sin6_local.sin6_port = inet->inet_sport; 1104 1105 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 1106 a->sin6_local.sin6_addr = np->saddr; 1107 else 1108 a->sin6_local.sin6_addr = sk->sk_v6_rcv_saddr; 1109 1110 a->sin6_remote.sin6_family = AF_INET6; 1111 a->sin6_remote.sin6_port = inet->inet_dport; 1112 a->sin6_remote.sin6_addr = sk->sk_v6_daddr; 1113#endif 1114 } 1115} 1116 1117static int mptcp_getsockopt_subflow_addrs(struct mptcp_sock *msk, char __user *optval, 1118 int __user *optlen) 1119{ 1120 struct mptcp_subflow_context *subflow; 1121 struct sock *sk = (struct sock *)msk; 1122 unsigned int sfcount = 0, copied = 0; 1123 struct mptcp_subflow_data sfd; 1124 char __user *addrptr; 1125 int len; 1126 1127 len = mptcp_get_subflow_data(&sfd, optval, optlen); 1128 if (len < 0) 1129 return len; 1130 1131 sfd.size_kernel = sizeof(struct mptcp_subflow_addrs); 1132 sfd.size_user = min_t(unsigned int, sfd.size_user, 1133 sizeof(struct mptcp_subflow_addrs)); 1134 1135 addrptr = optval + sfd.size_subflow_data; 1136 1137 lock_sock(sk); 1138 1139 mptcp_for_each_subflow(msk, subflow) { 1140 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1141 1142 ++sfcount; 1143 1144 if (len && len >= sfd.size_user) { 1145 struct mptcp_subflow_addrs a; 1146 1147 mptcp_get_sub_addrs(ssk, &a); 1148 1149 if (copy_to_user(addrptr, &a, sfd.size_user)) { 1150 release_sock(sk); 1151 return -EFAULT; 1152 } 1153 1154 addrptr += sfd.size_user; 1155 copied += sfd.size_user; 1156 len -= sfd.size_user; 1157 } 1158 } 1159 1160 release_sock(sk); 1161 1162 sfd.num_subflows = sfcount; 1163 1164 if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) 1165 return -EFAULT; 1166 1167 return 0; 1168} 1169 1170static int mptcp_get_full_info(struct mptcp_full_info *mfi, 1171 char __user *optval, 1172 int __user *optlen) 1173{ 1174 int len; 1175 1176 BUILD_BUG_ON(offsetof(struct mptcp_full_info, mptcp_info) != 1177 MIN_FULL_INFO_OPTLEN_SIZE); 1178 1179 if (get_user(len, optlen)) 1180 return -EFAULT; 1181 1182 if (len < MIN_FULL_INFO_OPTLEN_SIZE) 1183 return -EINVAL; 1184 1185 memset(mfi, 0, sizeof(*mfi)); 1186 if (copy_from_user(mfi, optval, MIN_FULL_INFO_OPTLEN_SIZE)) 1187 return -EFAULT; 1188 1189 if (mfi->size_tcpinfo_kernel || 1190 mfi->size_sfinfo_kernel || 1191 mfi->num_subflows) 1192 return -EINVAL; 1193 1194 if (mfi->size_sfinfo_user > INT_MAX || 1195 mfi->size_tcpinfo_user > INT_MAX) 1196 return -EINVAL; 1197 1198 return len - MIN_FULL_INFO_OPTLEN_SIZE; 1199} 1200 1201static int mptcp_put_full_info(struct mptcp_full_info *mfi, 1202 char __user *optval, 1203 u32 copylen, 1204 int __user *optlen) 1205{ 1206 copylen += MIN_FULL_INFO_OPTLEN_SIZE; 1207 if (put_user(copylen, optlen)) 1208 return -EFAULT; 1209 1210 if (copy_to_user(optval, mfi, copylen)) 1211 return -EFAULT; 1212 return 0; 1213} 1214 1215static int mptcp_getsockopt_full_info(struct mptcp_sock *msk, char __user *optval, 1216 int __user *optlen) 1217{ 1218 unsigned int sfcount = 0, copylen = 0; 1219 struct mptcp_subflow_context *subflow; 1220 struct sock *sk = (struct sock *)msk; 1221 void __user *tcpinfoptr, *sfinfoptr; 1222 struct mptcp_full_info mfi; 1223 int len; 1224 1225 len = mptcp_get_full_info(&mfi, optval, optlen); 1226 if (len < 0) 1227 return len; 1228 1229 /* don't bother filling the mptcp info if there is not enough 1230 * user-space-provided storage 1231 */ 1232 if (len > 0) { 1233 mptcp_diag_fill_info(msk, &mfi.mptcp_info); 1234 copylen += min_t(unsigned int, len, sizeof(struct mptcp_info)); 1235 } 1236 1237 mfi.size_tcpinfo_kernel = sizeof(struct tcp_info); 1238 mfi.size_tcpinfo_user = min_t(unsigned int, mfi.size_tcpinfo_user, 1239 sizeof(struct tcp_info)); 1240 sfinfoptr = u64_to_user_ptr(mfi.subflow_info); 1241 mfi.size_sfinfo_kernel = sizeof(struct mptcp_subflow_info); 1242 mfi.size_sfinfo_user = min_t(unsigned int, mfi.size_sfinfo_user, 1243 sizeof(struct mptcp_subflow_info)); 1244 tcpinfoptr = u64_to_user_ptr(mfi.tcp_info); 1245 1246 lock_sock(sk); 1247 mptcp_for_each_subflow(msk, subflow) { 1248 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1249 struct mptcp_subflow_info sfinfo; 1250 struct tcp_info tcp_info; 1251 1252 if (sfcount++ >= mfi.size_arrays_user) 1253 continue; 1254 1255 /* fetch addr/tcp_info only if the user space buffers 1256 * are wide enough 1257 */ 1258 memset(&sfinfo, 0, sizeof(sfinfo)); 1259 sfinfo.id = subflow->subflow_id; 1260 if (mfi.size_sfinfo_user > 1261 offsetof(struct mptcp_subflow_info, addrs)) 1262 mptcp_get_sub_addrs(ssk, &sfinfo.addrs); 1263 if (copy_to_user(sfinfoptr, &sfinfo, mfi.size_sfinfo_user)) 1264 goto fail_release; 1265 1266 if (mfi.size_tcpinfo_user) { 1267 tcp_get_info(ssk, &tcp_info); 1268 if (copy_to_user(tcpinfoptr, &tcp_info, 1269 mfi.size_tcpinfo_user)) 1270 goto fail_release; 1271 } 1272 1273 tcpinfoptr += mfi.size_tcpinfo_user; 1274 sfinfoptr += mfi.size_sfinfo_user; 1275 } 1276 release_sock(sk); 1277 1278 mfi.num_subflows = sfcount; 1279 if (mptcp_put_full_info(&mfi, optval, copylen, optlen)) 1280 return -EFAULT; 1281 1282 return 0; 1283 1284fail_release: 1285 release_sock(sk); 1286 return -EFAULT; 1287} 1288 1289static int mptcp_put_int_option(struct mptcp_sock *msk, char __user *optval, 1290 int __user *optlen, int val) 1291{ 1292 int len; 1293 1294 if (get_user(len, optlen)) 1295 return -EFAULT; 1296 if (len < 0) 1297 return -EINVAL; 1298 1299 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1300 unsigned char ucval = (unsigned char)val; 1301 1302 len = 1; 1303 if (put_user(len, optlen)) 1304 return -EFAULT; 1305 if (copy_to_user(optval, &ucval, 1)) 1306 return -EFAULT; 1307 } else { 1308 len = min_t(unsigned int, len, sizeof(int)); 1309 if (put_user(len, optlen)) 1310 return -EFAULT; 1311 if (copy_to_user(optval, &val, len)) 1312 return -EFAULT; 1313 } 1314 1315 return 0; 1316} 1317 1318static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 1319 char __user *optval, int __user *optlen) 1320{ 1321 switch (optname) { 1322 case TCP_ULP: 1323 case TCP_CONGESTION: 1324 case TCP_INFO: 1325 case TCP_CC_INFO: 1326 case TCP_DEFER_ACCEPT: 1327 case TCP_FASTOPEN: 1328 case TCP_FASTOPEN_CONNECT: 1329 case TCP_FASTOPEN_KEY: 1330 case TCP_FASTOPEN_NO_COOKIE: 1331 return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname, 1332 optval, optlen); 1333 case TCP_INQ: 1334 return mptcp_put_int_option(msk, optval, optlen, msk->recvmsg_inq); 1335 case TCP_CORK: 1336 return mptcp_put_int_option(msk, optval, optlen, msk->cork); 1337 case TCP_NODELAY: 1338 return mptcp_put_int_option(msk, optval, optlen, msk->nodelay); 1339 } 1340 return -EOPNOTSUPP; 1341} 1342 1343static int mptcp_getsockopt_v4(struct mptcp_sock *msk, int optname, 1344 char __user *optval, int __user *optlen) 1345{ 1346 struct sock *sk = (void *)msk; 1347 1348 switch (optname) { 1349 case IP_TOS: 1350 return mptcp_put_int_option(msk, optval, optlen, inet_sk(sk)->tos); 1351 } 1352 1353 return -EOPNOTSUPP; 1354} 1355 1356static int mptcp_getsockopt_sol_mptcp(struct mptcp_sock *msk, int optname, 1357 char __user *optval, int __user *optlen) 1358{ 1359 switch (optname) { 1360 case MPTCP_INFO: 1361 return mptcp_getsockopt_info(msk, optval, optlen); 1362 case MPTCP_FULL_INFO: 1363 return mptcp_getsockopt_full_info(msk, optval, optlen); 1364 case MPTCP_TCPINFO: 1365 return mptcp_getsockopt_tcpinfo(msk, optval, optlen); 1366 case MPTCP_SUBFLOW_ADDRS: 1367 return mptcp_getsockopt_subflow_addrs(msk, optval, optlen); 1368 } 1369 1370 return -EOPNOTSUPP; 1371} 1372 1373int mptcp_getsockopt(struct sock *sk, int level, int optname, 1374 char __user *optval, int __user *option) 1375{ 1376 struct mptcp_sock *msk = mptcp_sk(sk); 1377 struct sock *ssk; 1378 1379 pr_debug("msk=%p", msk); 1380 1381 /* @@ the meaning of setsockopt() when the socket is connected and 1382 * there are multiple subflows is not yet defined. It is up to the 1383 * MPTCP-level socket to configure the subflows until the subflow 1384 * is in TCP fallback, when socket options are passed through 1385 * to the one remaining subflow. 1386 */ 1387 lock_sock(sk); 1388 ssk = __mptcp_tcp_fallback(msk); 1389 release_sock(sk); 1390 if (ssk) 1391 return tcp_getsockopt(ssk, level, optname, optval, option); 1392 1393 if (level == SOL_IP) 1394 return mptcp_getsockopt_v4(msk, optname, optval, option); 1395 if (level == SOL_TCP) 1396 return mptcp_getsockopt_sol_tcp(msk, optname, optval, option); 1397 if (level == SOL_MPTCP) 1398 return mptcp_getsockopt_sol_mptcp(msk, optname, optval, option); 1399 return -EOPNOTSUPP; 1400} 1401 1402static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk) 1403{ 1404 static const unsigned int tx_rx_locks = SOCK_RCVBUF_LOCK | SOCK_SNDBUF_LOCK; 1405 struct sock *sk = (struct sock *)msk; 1406 1407 if (ssk->sk_prot->keepalive) { 1408 if (sock_flag(sk, SOCK_KEEPOPEN)) 1409 ssk->sk_prot->keepalive(ssk, 1); 1410 else 1411 ssk->sk_prot->keepalive(ssk, 0); 1412 } 1413 1414 ssk->sk_priority = sk->sk_priority; 1415 ssk->sk_bound_dev_if = sk->sk_bound_dev_if; 1416 ssk->sk_incoming_cpu = sk->sk_incoming_cpu; 1417 ssk->sk_ipv6only = sk->sk_ipv6only; 1418 __ip_sock_set_tos(ssk, inet_sk(sk)->tos); 1419 1420 if (sk->sk_userlocks & tx_rx_locks) { 1421 ssk->sk_userlocks |= sk->sk_userlocks & tx_rx_locks; 1422 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) { 1423 WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); 1424 mptcp_subflow_ctx(ssk)->cached_sndbuf = sk->sk_sndbuf; 1425 } 1426 if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) 1427 WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); 1428 } 1429 1430 if (sock_flag(sk, SOCK_LINGER)) { 1431 ssk->sk_lingertime = sk->sk_lingertime; 1432 sock_set_flag(ssk, SOCK_LINGER); 1433 } else { 1434 sock_reset_flag(ssk, SOCK_LINGER); 1435 } 1436 1437 if (sk->sk_mark != ssk->sk_mark) { 1438 ssk->sk_mark = sk->sk_mark; 1439 sk_dst_reset(ssk); 1440 } 1441 1442 sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG)); 1443 1444 if (inet_csk(sk)->icsk_ca_ops != inet_csk(ssk)->icsk_ca_ops) 1445 tcp_set_congestion_control(ssk, msk->ca_name, false, true); 1446 __tcp_sock_set_cork(ssk, !!msk->cork); 1447 __tcp_sock_set_nodelay(ssk, !!msk->nodelay); 1448 1449 inet_assign_bit(TRANSPARENT, ssk, inet_test_bit(TRANSPARENT, sk)); 1450 inet_assign_bit(FREEBIND, ssk, inet_test_bit(FREEBIND, sk)); 1451} 1452 1453static void __mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk) 1454{ 1455 bool slow = lock_sock_fast(ssk); 1456 1457 sync_socket_options(msk, ssk); 1458 1459 unlock_sock_fast(ssk, slow); 1460} 1461 1462void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk) 1463{ 1464 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1465 1466 msk_owned_by_me(msk); 1467 1468 if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { 1469 __mptcp_sockopt_sync(msk, ssk); 1470 1471 subflow->setsockopt_seq = msk->setsockopt_seq; 1472 } 1473} 1474 1475void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk) 1476{ 1477 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1478 1479 msk_owned_by_me(msk); 1480 1481 if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { 1482 sync_socket_options(msk, ssk); 1483 1484 subflow->setsockopt_seq = msk->setsockopt_seq; 1485 } 1486} 1487