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