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 WRITE_ONCE(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 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 } 206 207 static 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 } 250 251 static 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 } 291 292 static 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 } 388 389 static 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 } 435 436 static 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 } 582 583 static 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 } 625 626 static 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 } 655 656 static 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 } 685 686 static 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 } 723 724 static 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 = READ_ONCE(inet_sk(sk)->tos); 739 mptcp_for_each_subflow(msk, subflow) { 740 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 741 742 __ip_sock_set_tos(ssk, val); 743 } 744 release_sock(sk); 745 746 return 0; 747 } 748 749 static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname, 750 sockptr_t optval, unsigned int optlen) 751 { 752 switch (optname) { 753 case IP_FREEBIND: 754 case IP_TRANSPARENT: 755 return mptcp_setsockopt_sol_ip_set_transparent(msk, optname, optval, optlen); 756 case IP_TOS: 757 return mptcp_setsockopt_v4_set_tos(msk, optname, optval, optlen); 758 } 759 760 return -EOPNOTSUPP; 761 } 762 763 static int mptcp_setsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, 764 sockptr_t optval, unsigned int optlen) 765 { 766 struct sock *sk = (struct sock *)msk; 767 struct sock *ssk; 768 int ret; 769 770 /* Limit to first subflow, before the connection establishment */ 771 lock_sock(sk); 772 ssk = __mptcp_nmpc_sk(msk); 773 if (IS_ERR(ssk)) { 774 ret = PTR_ERR(ssk); 775 goto unlock; 776 } 777 778 ret = tcp_setsockopt(ssk, level, optname, optval, optlen); 779 780 unlock: 781 release_sock(sk); 782 return ret; 783 } 784 785 static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 786 sockptr_t optval, unsigned int optlen) 787 { 788 struct sock *sk = (void *)msk; 789 int ret, val; 790 791 switch (optname) { 792 case TCP_INQ: 793 ret = mptcp_get_int_option(msk, optval, optlen, &val); 794 if (ret) 795 return ret; 796 if (val < 0 || val > 1) 797 return -EINVAL; 798 799 lock_sock(sk); 800 msk->recvmsg_inq = !!val; 801 release_sock(sk); 802 return 0; 803 case TCP_ULP: 804 return -EOPNOTSUPP; 805 case TCP_CONGESTION: 806 return mptcp_setsockopt_sol_tcp_congestion(msk, optval, optlen); 807 case TCP_CORK: 808 return mptcp_setsockopt_sol_tcp_cork(msk, optval, optlen); 809 case TCP_NODELAY: 810 return mptcp_setsockopt_sol_tcp_nodelay(msk, optval, optlen); 811 case TCP_DEFER_ACCEPT: 812 /* See tcp.c: TCP_DEFER_ACCEPT does not fail */ 813 mptcp_setsockopt_first_sf_only(msk, SOL_TCP, optname, optval, optlen); 814 return 0; 815 case TCP_FASTOPEN: 816 case TCP_FASTOPEN_CONNECT: 817 case TCP_FASTOPEN_KEY: 818 case TCP_FASTOPEN_NO_COOKIE: 819 return mptcp_setsockopt_first_sf_only(msk, SOL_TCP, optname, 820 optval, optlen); 821 } 822 823 return -EOPNOTSUPP; 824 } 825 826 int mptcp_setsockopt(struct sock *sk, int level, int optname, 827 sockptr_t optval, unsigned int optlen) 828 { 829 struct mptcp_sock *msk = mptcp_sk(sk); 830 struct sock *ssk; 831 832 pr_debug("msk=%p", msk); 833 834 if (level == SOL_SOCKET) 835 return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen); 836 837 if (!mptcp_supported_sockopt(level, optname)) 838 return -ENOPROTOOPT; 839 840 /* @@ the meaning of setsockopt() when the socket is connected and 841 * there are multiple subflows is not yet defined. It is up to the 842 * MPTCP-level socket to configure the subflows until the subflow 843 * is in TCP fallback, when TCP socket options are passed through 844 * to the one remaining subflow. 845 */ 846 lock_sock(sk); 847 ssk = __mptcp_tcp_fallback(msk); 848 release_sock(sk); 849 if (ssk) 850 return tcp_setsockopt(ssk, level, optname, optval, optlen); 851 852 if (level == SOL_IP) 853 return mptcp_setsockopt_v4(msk, optname, optval, optlen); 854 855 if (level == SOL_IPV6) 856 return mptcp_setsockopt_v6(msk, optname, optval, optlen); 857 858 if (level == SOL_TCP) 859 return mptcp_setsockopt_sol_tcp(msk, optname, optval, optlen); 860 861 return -EOPNOTSUPP; 862 } 863 864 static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, 865 char __user *optval, int __user *optlen) 866 { 867 struct sock *sk = (struct sock *)msk; 868 struct sock *ssk; 869 int ret; 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 ssk = __mptcp_nmpc_sk(msk); 879 if (IS_ERR(ssk)) { 880 ret = PTR_ERR(ssk); 881 goto out; 882 } 883 884 ret = tcp_getsockopt(ssk, 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 (__mptcp_check_fallback(msk)) 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, READ_ONCE(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 mptcp_subflow_ctx(ssk)->cached_sndbuf = sk->sk_sndbuf; 1422 } 1423 if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) 1424 WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); 1425 } 1426 1427 if (sock_flag(sk, SOCK_LINGER)) { 1428 ssk->sk_lingertime = sk->sk_lingertime; 1429 sock_set_flag(ssk, SOCK_LINGER); 1430 } else { 1431 sock_reset_flag(ssk, SOCK_LINGER); 1432 } 1433 1434 if (sk->sk_mark != ssk->sk_mark) { 1435 ssk->sk_mark = sk->sk_mark; 1436 sk_dst_reset(ssk); 1437 } 1438 1439 sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG)); 1440 1441 if (inet_csk(sk)->icsk_ca_ops != inet_csk(ssk)->icsk_ca_ops) 1442 tcp_set_congestion_control(ssk, msk->ca_name, false, true); 1443 __tcp_sock_set_cork(ssk, !!msk->cork); 1444 __tcp_sock_set_nodelay(ssk, !!msk->nodelay); 1445 1446 inet_assign_bit(TRANSPARENT, ssk, inet_test_bit(TRANSPARENT, sk)); 1447 inet_assign_bit(FREEBIND, ssk, inet_test_bit(FREEBIND, sk)); 1448 } 1449 1450 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk) 1451 { 1452 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1453 1454 msk_owned_by_me(msk); 1455 1456 ssk->sk_rcvlowat = 0; 1457 1458 /* subflows must ignore any latency-related settings: will not affect 1459 * the user-space - only the msk is relevant - but will foul the 1460 * mptcp scheduler 1461 */ 1462 tcp_sk(ssk)->notsent_lowat = UINT_MAX; 1463 1464 if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { 1465 sync_socket_options(msk, ssk); 1466 1467 subflow->setsockopt_seq = msk->setsockopt_seq; 1468 } 1469 } 1470 1471 /* unfortunately this is different enough from the tcp version so 1472 * that we can't factor it out 1473 */ 1474 int mptcp_set_rcvlowat(struct sock *sk, int val) 1475 { 1476 struct mptcp_subflow_context *subflow; 1477 int space, cap; 1478 1479 if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) 1480 cap = sk->sk_rcvbuf >> 1; 1481 else 1482 cap = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_rmem[2]) >> 1; 1483 val = min(val, cap); 1484 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); 1485 1486 /* Check if we need to signal EPOLLIN right now */ 1487 if (mptcp_epollin_ready(sk)) 1488 sk->sk_data_ready(sk); 1489 1490 if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) 1491 return 0; 1492 1493 space = __tcp_space_from_win(mptcp_sk(sk)->scaling_ratio, val); 1494 if (space <= sk->sk_rcvbuf) 1495 return 0; 1496 1497 /* propagate the rcvbuf changes to all the subflows */ 1498 WRITE_ONCE(sk->sk_rcvbuf, space); 1499 mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 1500 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1501 bool slow; 1502 1503 slow = lock_sock_fast(ssk); 1504 WRITE_ONCE(ssk->sk_rcvbuf, space); 1505 tcp_sk(ssk)->window_clamp = val; 1506 unlock_sock_fast(ssk, slow); 1507 } 1508 return 0; 1509 } 1510