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