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 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 case IP_BIND_ADDRESS_NO_PORT: 442 case IP_LOCAL_PORT_RANGE: 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_MTU_DISCOVER: 459 case IP_RECVERR: 460 461 /* possibly less common may deserve some love */ 462 case IP_MINTTL: 463 464 /* the following is apparently a no-op for plain TCP */ 465 case IP_RECVERR_RFC4884: 466 return true; 467 } 468 469 /* IP_OPTIONS is not supported, needs subflow care */ 470 /* IP_HDRINCL, IP_NODEFRAG are not supported, RAW specific */ 471 /* IP_MULTICAST_TTL, IP_MULTICAST_LOOP, IP_UNICAST_IF, 472 * IP_ADD_MEMBERSHIP, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP, 473 * IP_DROP_SOURCE_MEMBERSHIP, IP_BLOCK_SOURCE, IP_UNBLOCK_SOURCE, 474 * MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP MCAST_JOIN_SOURCE_GROUP, 475 * MCAST_LEAVE_SOURCE_GROUP, MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, 476 * MCAST_MSFILTER, IP_MULTICAST_ALL are not supported, better not deal 477 * with mcast stuff 478 */ 479 /* IP_IPSEC_POLICY, IP_XFRM_POLICY are nut supported, unrelated here */ 480 return false; 481 } 482 if (level == SOL_IPV6) { 483 switch (optname) { 484 case IPV6_V6ONLY: 485 486 /* the following are control cmsg related */ 487 case IPV6_RECVPKTINFO: 488 case IPV6_2292PKTINFO: 489 case IPV6_RECVHOPLIMIT: 490 case IPV6_2292HOPLIMIT: 491 case IPV6_RECVRTHDR: 492 case IPV6_2292RTHDR: 493 case IPV6_RECVHOPOPTS: 494 case IPV6_2292HOPOPTS: 495 case IPV6_RECVDSTOPTS: 496 case IPV6_2292DSTOPTS: 497 case IPV6_RECVTCLASS: 498 case IPV6_FLOWINFO: 499 case IPV6_RECVPATHMTU: 500 case IPV6_RECVORIGDSTADDR: 501 case IPV6_RECVFRAGSIZE: 502 503 /* the following ones need some love but are quite common */ 504 case IPV6_TCLASS: 505 case IPV6_TRANSPARENT: 506 case IPV6_FREEBIND: 507 case IPV6_PKTINFO: 508 case IPV6_2292PKTOPTIONS: 509 case IPV6_UNICAST_HOPS: 510 case IPV6_MTU_DISCOVER: 511 case IPV6_MTU: 512 case IPV6_RECVERR: 513 case IPV6_FLOWINFO_SEND: 514 case IPV6_FLOWLABEL_MGR: 515 case IPV6_MINHOPCOUNT: 516 case IPV6_DONTFRAG: 517 case IPV6_AUTOFLOWLABEL: 518 519 /* the following one is a no-op for plain TCP */ 520 case IPV6_RECVERR_RFC4884: 521 return true; 522 } 523 524 /* IPV6_HOPOPTS, IPV6_RTHDRDSTOPTS, IPV6_RTHDR, IPV6_DSTOPTS are 525 * not supported 526 */ 527 /* IPV6_MULTICAST_HOPS, IPV6_MULTICAST_LOOP, IPV6_UNICAST_IF, 528 * IPV6_MULTICAST_IF, IPV6_ADDRFORM, 529 * IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST, 530 * IPV6_LEAVE_ANYCAST, IPV6_MULTICAST_ALL, MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP, 531 * MCAST_JOIN_SOURCE_GROUP, MCAST_LEAVE_SOURCE_GROUP, 532 * MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, MCAST_MSFILTER 533 * are not supported better not deal with mcast 534 */ 535 /* IPV6_ROUTER_ALERT, IPV6_ROUTER_ALERT_ISOLATE are not supported, since are evil */ 536 537 /* IPV6_IPSEC_POLICY, IPV6_XFRM_POLICY are not supported */ 538 /* IPV6_ADDR_PREFERENCES is not supported, we must be careful with subflows */ 539 return false; 540 } 541 if (level == SOL_TCP) { 542 switch (optname) { 543 /* the following are no-op or should work just fine */ 544 case TCP_THIN_DUPACK: 545 case TCP_DEFER_ACCEPT: 546 547 /* the following need some love */ 548 case TCP_MAXSEG: 549 case TCP_NODELAY: 550 case TCP_THIN_LINEAR_TIMEOUTS: 551 case TCP_CONGESTION: 552 case TCP_CORK: 553 case TCP_KEEPIDLE: 554 case TCP_KEEPINTVL: 555 case TCP_KEEPCNT: 556 case TCP_SYNCNT: 557 case TCP_SAVE_SYN: 558 case TCP_LINGER2: 559 case TCP_WINDOW_CLAMP: 560 case TCP_QUICKACK: 561 case TCP_USER_TIMEOUT: 562 case TCP_TIMESTAMP: 563 case TCP_NOTSENT_LOWAT: 564 case TCP_TX_DELAY: 565 case TCP_INQ: 566 case TCP_FASTOPEN: 567 case TCP_FASTOPEN_CONNECT: 568 case TCP_FASTOPEN_KEY: 569 case TCP_FASTOPEN_NO_COOKIE: 570 return true; 571 } 572 573 /* TCP_MD5SIG, TCP_MD5SIG_EXT are not supported, MD5 is not compatible with MPTCP */ 574 575 /* TCP_REPAIR, TCP_REPAIR_QUEUE, TCP_QUEUE_SEQ, TCP_REPAIR_OPTIONS, 576 * TCP_REPAIR_WINDOW are not supported, better avoid this mess 577 */ 578 } 579 return false; 580 } 581 582 static int mptcp_setsockopt_sol_tcp_congestion(struct mptcp_sock *msk, sockptr_t optval, 583 unsigned int optlen) 584 { 585 struct mptcp_subflow_context *subflow; 586 struct sock *sk = (struct sock *)msk; 587 char name[TCP_CA_NAME_MAX]; 588 bool cap_net_admin; 589 int ret; 590 591 if (optlen < 1) 592 return -EINVAL; 593 594 ret = strncpy_from_sockptr(name, optval, 595 min_t(long, TCP_CA_NAME_MAX - 1, optlen)); 596 if (ret < 0) 597 return -EFAULT; 598 599 name[ret] = 0; 600 601 cap_net_admin = ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN); 602 603 ret = 0; 604 lock_sock(sk); 605 sockopt_seq_inc(msk); 606 mptcp_for_each_subflow(msk, subflow) { 607 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 608 int err; 609 610 lock_sock(ssk); 611 err = tcp_set_congestion_control(ssk, name, true, cap_net_admin); 612 if (err < 0 && ret == 0) 613 ret = err; 614 subflow->setsockopt_seq = msk->setsockopt_seq; 615 release_sock(ssk); 616 } 617 618 if (ret == 0) 619 strscpy(msk->ca_name, name, sizeof(msk->ca_name)); 620 621 release_sock(sk); 622 return ret; 623 } 624 625 static int __mptcp_setsockopt_set_val(struct mptcp_sock *msk, int max, 626 int (*set_val)(struct sock *, int), 627 int *msk_val, int val) 628 { 629 struct mptcp_subflow_context *subflow; 630 int err = 0; 631 632 mptcp_for_each_subflow(msk, subflow) { 633 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 634 int ret; 635 636 lock_sock(ssk); 637 ret = set_val(ssk, val); 638 err = err ? : ret; 639 release_sock(ssk); 640 } 641 642 if (!err) { 643 *msk_val = val; 644 sockopt_seq_inc(msk); 645 } 646 647 return err; 648 } 649 650 static int __mptcp_setsockopt_sol_tcp_cork(struct mptcp_sock *msk, int val) 651 { 652 struct mptcp_subflow_context *subflow; 653 struct sock *sk = (struct sock *)msk; 654 655 sockopt_seq_inc(msk); 656 msk->cork = !!val; 657 mptcp_for_each_subflow(msk, subflow) { 658 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 659 660 lock_sock(ssk); 661 __tcp_sock_set_cork(ssk, !!val); 662 release_sock(ssk); 663 } 664 if (!val) 665 mptcp_check_and_set_pending(sk); 666 667 return 0; 668 } 669 670 static int __mptcp_setsockopt_sol_tcp_nodelay(struct mptcp_sock *msk, int val) 671 { 672 struct mptcp_subflow_context *subflow; 673 struct sock *sk = (struct sock *)msk; 674 675 sockopt_seq_inc(msk); 676 msk->nodelay = !!val; 677 mptcp_for_each_subflow(msk, subflow) { 678 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 679 680 lock_sock(ssk); 681 __tcp_sock_set_nodelay(ssk, !!val); 682 release_sock(ssk); 683 } 684 if (val) 685 mptcp_check_and_set_pending(sk); 686 return 0; 687 } 688 689 static int mptcp_setsockopt_sol_ip_set(struct mptcp_sock *msk, int optname, 690 sockptr_t optval, unsigned int optlen) 691 { 692 struct sock *sk = (struct sock *)msk; 693 struct sock *ssk; 694 int err; 695 696 err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen); 697 if (err != 0) 698 return err; 699 700 lock_sock(sk); 701 702 ssk = __mptcp_nmpc_sk(msk); 703 if (IS_ERR(ssk)) { 704 release_sock(sk); 705 return PTR_ERR(ssk); 706 } 707 708 switch (optname) { 709 case IP_FREEBIND: 710 inet_assign_bit(FREEBIND, ssk, inet_test_bit(FREEBIND, sk)); 711 break; 712 case IP_TRANSPARENT: 713 inet_assign_bit(TRANSPARENT, ssk, 714 inet_test_bit(TRANSPARENT, sk)); 715 break; 716 case IP_BIND_ADDRESS_NO_PORT: 717 inet_assign_bit(BIND_ADDRESS_NO_PORT, ssk, 718 inet_test_bit(BIND_ADDRESS_NO_PORT, sk)); 719 break; 720 case IP_LOCAL_PORT_RANGE: 721 WRITE_ONCE(inet_sk(ssk)->local_port_range, 722 READ_ONCE(inet_sk(sk)->local_port_range)); 723 break; 724 default: 725 release_sock(sk); 726 WARN_ON_ONCE(1); 727 return -EOPNOTSUPP; 728 } 729 730 sockopt_seq_inc(msk); 731 release_sock(sk); 732 return 0; 733 } 734 735 static int mptcp_setsockopt_v4_set_tos(struct mptcp_sock *msk, int optname, 736 sockptr_t optval, unsigned int optlen) 737 { 738 struct mptcp_subflow_context *subflow; 739 struct sock *sk = (struct sock *)msk; 740 int err, val; 741 742 err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen); 743 744 if (err != 0) 745 return err; 746 747 lock_sock(sk); 748 sockopt_seq_inc(msk); 749 val = READ_ONCE(inet_sk(sk)->tos); 750 mptcp_for_each_subflow(msk, subflow) { 751 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 752 bool slow; 753 754 slow = lock_sock_fast(ssk); 755 __ip_sock_set_tos(ssk, val); 756 unlock_sock_fast(ssk, slow); 757 } 758 release_sock(sk); 759 760 return 0; 761 } 762 763 static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname, 764 sockptr_t optval, unsigned int optlen) 765 { 766 switch (optname) { 767 case IP_FREEBIND: 768 case IP_TRANSPARENT: 769 case IP_BIND_ADDRESS_NO_PORT: 770 case IP_LOCAL_PORT_RANGE: 771 return mptcp_setsockopt_sol_ip_set(msk, optname, optval, optlen); 772 case IP_TOS: 773 return mptcp_setsockopt_v4_set_tos(msk, optname, optval, optlen); 774 } 775 776 return -EOPNOTSUPP; 777 } 778 779 static int mptcp_setsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, 780 sockptr_t optval, unsigned int optlen) 781 { 782 struct sock *sk = (struct sock *)msk; 783 struct sock *ssk; 784 int ret; 785 786 /* Limit to first subflow, before the connection establishment */ 787 lock_sock(sk); 788 ssk = __mptcp_nmpc_sk(msk); 789 if (IS_ERR(ssk)) { 790 ret = PTR_ERR(ssk); 791 goto unlock; 792 } 793 794 ret = tcp_setsockopt(ssk, level, optname, optval, optlen); 795 796 unlock: 797 release_sock(sk); 798 return ret; 799 } 800 801 static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 802 sockptr_t optval, unsigned int optlen) 803 { 804 struct sock *sk = (void *)msk; 805 int ret, val; 806 807 switch (optname) { 808 case TCP_ULP: 809 return -EOPNOTSUPP; 810 case TCP_CONGESTION: 811 return mptcp_setsockopt_sol_tcp_congestion(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 ret = mptcp_get_int_option(msk, optval, optlen, &val); 825 if (ret) 826 return ret; 827 828 lock_sock(sk); 829 switch (optname) { 830 case TCP_INQ: 831 if (val < 0 || val > 1) 832 ret = -EINVAL; 833 else 834 msk->recvmsg_inq = !!val; 835 break; 836 case TCP_NOTSENT_LOWAT: 837 WRITE_ONCE(msk->notsent_lowat, val); 838 mptcp_write_space(sk); 839 break; 840 case TCP_CORK: 841 ret = __mptcp_setsockopt_sol_tcp_cork(msk, val); 842 break; 843 case TCP_NODELAY: 844 ret = __mptcp_setsockopt_sol_tcp_nodelay(msk, val); 845 break; 846 case TCP_KEEPIDLE: 847 ret = __mptcp_setsockopt_set_val(msk, MAX_TCP_KEEPIDLE, 848 &tcp_sock_set_keepidle_locked, 849 &msk->keepalive_idle, val); 850 break; 851 case TCP_KEEPINTVL: 852 ret = __mptcp_setsockopt_set_val(msk, MAX_TCP_KEEPINTVL, 853 &tcp_sock_set_keepintvl, 854 &msk->keepalive_intvl, val); 855 break; 856 case TCP_KEEPCNT: 857 ret = __mptcp_setsockopt_set_val(msk, MAX_TCP_KEEPCNT, 858 &tcp_sock_set_keepcnt, 859 &msk->keepalive_cnt, 860 val); 861 break; 862 default: 863 ret = -ENOPROTOOPT; 864 } 865 866 release_sock(sk); 867 return ret; 868 } 869 870 int mptcp_setsockopt(struct sock *sk, int level, int optname, 871 sockptr_t optval, unsigned int optlen) 872 { 873 struct mptcp_sock *msk = mptcp_sk(sk); 874 struct sock *ssk; 875 876 pr_debug("msk=%p\n", msk); 877 878 if (level == SOL_SOCKET) 879 return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen); 880 881 if (!mptcp_supported_sockopt(level, optname)) 882 return -ENOPROTOOPT; 883 884 /* @@ the meaning of setsockopt() when the socket is connected and 885 * there are multiple subflows is not yet defined. It is up to the 886 * MPTCP-level socket to configure the subflows until the subflow 887 * is in TCP fallback, when TCP socket options are passed through 888 * to the one remaining subflow. 889 */ 890 lock_sock(sk); 891 ssk = __mptcp_tcp_fallback(msk); 892 release_sock(sk); 893 if (ssk) 894 return tcp_setsockopt(ssk, level, optname, optval, optlen); 895 896 if (level == SOL_IP) 897 return mptcp_setsockopt_v4(msk, optname, optval, optlen); 898 899 if (level == SOL_IPV6) 900 return mptcp_setsockopt_v6(msk, optname, optval, optlen); 901 902 if (level == SOL_TCP) 903 return mptcp_setsockopt_sol_tcp(msk, optname, optval, optlen); 904 905 return -EOPNOTSUPP; 906 } 907 908 static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, 909 char __user *optval, int __user *optlen) 910 { 911 struct sock *sk = (struct sock *)msk; 912 struct sock *ssk; 913 int ret; 914 915 lock_sock(sk); 916 ssk = msk->first; 917 if (ssk) { 918 ret = tcp_getsockopt(ssk, level, optname, optval, optlen); 919 goto out; 920 } 921 922 ssk = __mptcp_nmpc_sk(msk); 923 if (IS_ERR(ssk)) { 924 ret = PTR_ERR(ssk); 925 goto out; 926 } 927 928 ret = tcp_getsockopt(ssk, level, optname, optval, optlen); 929 930 out: 931 release_sock(sk); 932 return ret; 933 } 934 935 void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info) 936 { 937 struct sock *sk = (struct sock *)msk; 938 u32 flags = 0; 939 bool slow; 940 u32 now; 941 942 memset(info, 0, sizeof(*info)); 943 944 info->mptcpi_subflows = READ_ONCE(msk->pm.subflows); 945 info->mptcpi_add_addr_signal = READ_ONCE(msk->pm.add_addr_signaled); 946 info->mptcpi_add_addr_accepted = READ_ONCE(msk->pm.add_addr_accepted); 947 info->mptcpi_local_addr_used = READ_ONCE(msk->pm.local_addr_used); 948 949 if (inet_sk_state_load(sk) == TCP_LISTEN) 950 return; 951 952 /* The following limits only make sense for the in-kernel PM */ 953 if (mptcp_pm_is_kernel(msk)) { 954 info->mptcpi_subflows_max = 955 mptcp_pm_get_subflows_max(msk); 956 info->mptcpi_add_addr_signal_max = 957 mptcp_pm_get_add_addr_signal_max(msk); 958 info->mptcpi_add_addr_accepted_max = 959 mptcp_pm_get_add_addr_accept_max(msk); 960 info->mptcpi_local_addr_max = 961 mptcp_pm_get_local_addr_max(msk); 962 } 963 964 if (__mptcp_check_fallback(msk)) 965 flags |= MPTCP_INFO_FLAG_FALLBACK; 966 if (READ_ONCE(msk->can_ack)) 967 flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED; 968 info->mptcpi_flags = flags; 969 970 slow = lock_sock_fast(sk); 971 info->mptcpi_csum_enabled = READ_ONCE(msk->csum_enabled); 972 info->mptcpi_token = msk->token; 973 info->mptcpi_write_seq = msk->write_seq; 974 info->mptcpi_retransmits = inet_csk(sk)->icsk_retransmits; 975 info->mptcpi_bytes_sent = msk->bytes_sent; 976 info->mptcpi_bytes_received = msk->bytes_received; 977 info->mptcpi_bytes_retrans = msk->bytes_retrans; 978 info->mptcpi_subflows_total = info->mptcpi_subflows + 979 __mptcp_has_initial_subflow(msk); 980 now = tcp_jiffies32; 981 info->mptcpi_last_data_sent = jiffies_to_msecs(now - msk->last_data_sent); 982 info->mptcpi_last_data_recv = jiffies_to_msecs(now - msk->last_data_recv); 983 unlock_sock_fast(sk, slow); 984 985 mptcp_data_lock(sk); 986 info->mptcpi_last_ack_recv = jiffies_to_msecs(now - msk->last_ack_recv); 987 info->mptcpi_snd_una = msk->snd_una; 988 info->mptcpi_rcv_nxt = msk->ack_seq; 989 info->mptcpi_bytes_acked = msk->bytes_acked; 990 mptcp_data_unlock(sk); 991 } 992 EXPORT_SYMBOL_GPL(mptcp_diag_fill_info); 993 994 static int mptcp_getsockopt_info(struct mptcp_sock *msk, char __user *optval, int __user *optlen) 995 { 996 struct mptcp_info m_info; 997 int len; 998 999 if (get_user(len, optlen)) 1000 return -EFAULT; 1001 1002 /* When used only to check if a fallback to TCP happened. */ 1003 if (len == 0) 1004 return 0; 1005 1006 len = min_t(unsigned int, len, sizeof(struct mptcp_info)); 1007 1008 mptcp_diag_fill_info(msk, &m_info); 1009 1010 if (put_user(len, optlen)) 1011 return -EFAULT; 1012 1013 if (copy_to_user(optval, &m_info, len)) 1014 return -EFAULT; 1015 1016 return 0; 1017 } 1018 1019 static int mptcp_put_subflow_data(struct mptcp_subflow_data *sfd, 1020 char __user *optval, 1021 u32 copied, 1022 int __user *optlen) 1023 { 1024 u32 copylen = min_t(u32, sfd->size_subflow_data, sizeof(*sfd)); 1025 1026 if (copied) 1027 copied += sfd->size_subflow_data; 1028 else 1029 copied = copylen; 1030 1031 if (put_user(copied, optlen)) 1032 return -EFAULT; 1033 1034 if (copy_to_user(optval, sfd, copylen)) 1035 return -EFAULT; 1036 1037 return 0; 1038 } 1039 1040 static int mptcp_get_subflow_data(struct mptcp_subflow_data *sfd, 1041 char __user *optval, 1042 int __user *optlen) 1043 { 1044 int len, copylen; 1045 1046 if (get_user(len, optlen)) 1047 return -EFAULT; 1048 1049 /* if mptcp_subflow_data size is changed, need to adjust 1050 * this function to deal with programs using old version. 1051 */ 1052 BUILD_BUG_ON(sizeof(*sfd) != MIN_INFO_OPTLEN_SIZE); 1053 1054 if (len < MIN_INFO_OPTLEN_SIZE) 1055 return -EINVAL; 1056 1057 memset(sfd, 0, sizeof(*sfd)); 1058 1059 copylen = min_t(unsigned int, len, sizeof(*sfd)); 1060 if (copy_from_user(sfd, optval, copylen)) 1061 return -EFAULT; 1062 1063 /* size_subflow_data is u32, but len is signed */ 1064 if (sfd->size_subflow_data > INT_MAX || 1065 sfd->size_user > INT_MAX) 1066 return -EINVAL; 1067 1068 if (sfd->size_subflow_data < MIN_INFO_OPTLEN_SIZE || 1069 sfd->size_subflow_data > len) 1070 return -EINVAL; 1071 1072 if (sfd->num_subflows || sfd->size_kernel) 1073 return -EINVAL; 1074 1075 return len - sfd->size_subflow_data; 1076 } 1077 1078 static int mptcp_getsockopt_tcpinfo(struct mptcp_sock *msk, char __user *optval, 1079 int __user *optlen) 1080 { 1081 struct mptcp_subflow_context *subflow; 1082 struct sock *sk = (struct sock *)msk; 1083 unsigned int sfcount = 0, copied = 0; 1084 struct mptcp_subflow_data sfd; 1085 char __user *infoptr; 1086 int len; 1087 1088 len = mptcp_get_subflow_data(&sfd, optval, optlen); 1089 if (len < 0) 1090 return len; 1091 1092 sfd.size_kernel = sizeof(struct tcp_info); 1093 sfd.size_user = min_t(unsigned int, sfd.size_user, 1094 sizeof(struct tcp_info)); 1095 1096 infoptr = optval + sfd.size_subflow_data; 1097 1098 lock_sock(sk); 1099 1100 mptcp_for_each_subflow(msk, subflow) { 1101 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1102 1103 ++sfcount; 1104 1105 if (len && len >= sfd.size_user) { 1106 struct tcp_info info; 1107 1108 tcp_get_info(ssk, &info); 1109 1110 if (copy_to_user(infoptr, &info, sfd.size_user)) { 1111 release_sock(sk); 1112 return -EFAULT; 1113 } 1114 1115 infoptr += sfd.size_user; 1116 copied += sfd.size_user; 1117 len -= sfd.size_user; 1118 } 1119 } 1120 1121 release_sock(sk); 1122 1123 sfd.num_subflows = sfcount; 1124 1125 if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) 1126 return -EFAULT; 1127 1128 return 0; 1129 } 1130 1131 static void mptcp_get_sub_addrs(const struct sock *sk, struct mptcp_subflow_addrs *a) 1132 { 1133 const struct inet_sock *inet = inet_sk(sk); 1134 1135 memset(a, 0, sizeof(*a)); 1136 1137 if (sk->sk_family == AF_INET) { 1138 a->sin_local.sin_family = AF_INET; 1139 a->sin_local.sin_port = inet->inet_sport; 1140 a->sin_local.sin_addr.s_addr = inet->inet_rcv_saddr; 1141 1142 if (!a->sin_local.sin_addr.s_addr) 1143 a->sin_local.sin_addr.s_addr = inet->inet_saddr; 1144 1145 a->sin_remote.sin_family = AF_INET; 1146 a->sin_remote.sin_port = inet->inet_dport; 1147 a->sin_remote.sin_addr.s_addr = inet->inet_daddr; 1148 #if IS_ENABLED(CONFIG_IPV6) 1149 } else if (sk->sk_family == AF_INET6) { 1150 const struct ipv6_pinfo *np = inet6_sk(sk); 1151 1152 if (WARN_ON_ONCE(!np)) 1153 return; 1154 1155 a->sin6_local.sin6_family = AF_INET6; 1156 a->sin6_local.sin6_port = inet->inet_sport; 1157 1158 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 1159 a->sin6_local.sin6_addr = np->saddr; 1160 else 1161 a->sin6_local.sin6_addr = sk->sk_v6_rcv_saddr; 1162 1163 a->sin6_remote.sin6_family = AF_INET6; 1164 a->sin6_remote.sin6_port = inet->inet_dport; 1165 a->sin6_remote.sin6_addr = sk->sk_v6_daddr; 1166 #endif 1167 } 1168 } 1169 1170 static int mptcp_getsockopt_subflow_addrs(struct mptcp_sock *msk, char __user *optval, 1171 int __user *optlen) 1172 { 1173 struct mptcp_subflow_context *subflow; 1174 struct sock *sk = (struct sock *)msk; 1175 unsigned int sfcount = 0, copied = 0; 1176 struct mptcp_subflow_data sfd; 1177 char __user *addrptr; 1178 int len; 1179 1180 len = mptcp_get_subflow_data(&sfd, optval, optlen); 1181 if (len < 0) 1182 return len; 1183 1184 sfd.size_kernel = sizeof(struct mptcp_subflow_addrs); 1185 sfd.size_user = min_t(unsigned int, sfd.size_user, 1186 sizeof(struct mptcp_subflow_addrs)); 1187 1188 addrptr = optval + sfd.size_subflow_data; 1189 1190 lock_sock(sk); 1191 1192 mptcp_for_each_subflow(msk, subflow) { 1193 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1194 1195 ++sfcount; 1196 1197 if (len && len >= sfd.size_user) { 1198 struct mptcp_subflow_addrs a; 1199 1200 mptcp_get_sub_addrs(ssk, &a); 1201 1202 if (copy_to_user(addrptr, &a, sfd.size_user)) { 1203 release_sock(sk); 1204 return -EFAULT; 1205 } 1206 1207 addrptr += sfd.size_user; 1208 copied += sfd.size_user; 1209 len -= sfd.size_user; 1210 } 1211 } 1212 1213 release_sock(sk); 1214 1215 sfd.num_subflows = sfcount; 1216 1217 if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) 1218 return -EFAULT; 1219 1220 return 0; 1221 } 1222 1223 static int mptcp_get_full_info(struct mptcp_full_info *mfi, 1224 char __user *optval, 1225 int __user *optlen) 1226 { 1227 int len; 1228 1229 BUILD_BUG_ON(offsetof(struct mptcp_full_info, mptcp_info) != 1230 MIN_FULL_INFO_OPTLEN_SIZE); 1231 1232 if (get_user(len, optlen)) 1233 return -EFAULT; 1234 1235 if (len < MIN_FULL_INFO_OPTLEN_SIZE) 1236 return -EINVAL; 1237 1238 memset(mfi, 0, sizeof(*mfi)); 1239 if (copy_from_user(mfi, optval, MIN_FULL_INFO_OPTLEN_SIZE)) 1240 return -EFAULT; 1241 1242 if (mfi->size_tcpinfo_kernel || 1243 mfi->size_sfinfo_kernel || 1244 mfi->num_subflows) 1245 return -EINVAL; 1246 1247 if (mfi->size_sfinfo_user > INT_MAX || 1248 mfi->size_tcpinfo_user > INT_MAX) 1249 return -EINVAL; 1250 1251 return len - MIN_FULL_INFO_OPTLEN_SIZE; 1252 } 1253 1254 static int mptcp_put_full_info(struct mptcp_full_info *mfi, 1255 char __user *optval, 1256 u32 copylen, 1257 int __user *optlen) 1258 { 1259 copylen += MIN_FULL_INFO_OPTLEN_SIZE; 1260 if (put_user(copylen, optlen)) 1261 return -EFAULT; 1262 1263 if (copy_to_user(optval, mfi, copylen)) 1264 return -EFAULT; 1265 return 0; 1266 } 1267 1268 static int mptcp_getsockopt_full_info(struct mptcp_sock *msk, char __user *optval, 1269 int __user *optlen) 1270 { 1271 unsigned int sfcount = 0, copylen = 0; 1272 struct mptcp_subflow_context *subflow; 1273 struct sock *sk = (struct sock *)msk; 1274 void __user *tcpinfoptr, *sfinfoptr; 1275 struct mptcp_full_info mfi; 1276 int len; 1277 1278 len = mptcp_get_full_info(&mfi, optval, optlen); 1279 if (len < 0) 1280 return len; 1281 1282 /* don't bother filling the mptcp info if there is not enough 1283 * user-space-provided storage 1284 */ 1285 if (len > 0) { 1286 mptcp_diag_fill_info(msk, &mfi.mptcp_info); 1287 copylen += min_t(unsigned int, len, sizeof(struct mptcp_info)); 1288 } 1289 1290 mfi.size_tcpinfo_kernel = sizeof(struct tcp_info); 1291 mfi.size_tcpinfo_user = min_t(unsigned int, mfi.size_tcpinfo_user, 1292 sizeof(struct tcp_info)); 1293 sfinfoptr = u64_to_user_ptr(mfi.subflow_info); 1294 mfi.size_sfinfo_kernel = sizeof(struct mptcp_subflow_info); 1295 mfi.size_sfinfo_user = min_t(unsigned int, mfi.size_sfinfo_user, 1296 sizeof(struct mptcp_subflow_info)); 1297 tcpinfoptr = u64_to_user_ptr(mfi.tcp_info); 1298 1299 lock_sock(sk); 1300 mptcp_for_each_subflow(msk, subflow) { 1301 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1302 struct mptcp_subflow_info sfinfo; 1303 struct tcp_info tcp_info; 1304 1305 if (sfcount++ >= mfi.size_arrays_user) 1306 continue; 1307 1308 /* fetch addr/tcp_info only if the user space buffers 1309 * are wide enough 1310 */ 1311 memset(&sfinfo, 0, sizeof(sfinfo)); 1312 sfinfo.id = subflow->subflow_id; 1313 if (mfi.size_sfinfo_user > 1314 offsetof(struct mptcp_subflow_info, addrs)) 1315 mptcp_get_sub_addrs(ssk, &sfinfo.addrs); 1316 if (copy_to_user(sfinfoptr, &sfinfo, mfi.size_sfinfo_user)) 1317 goto fail_release; 1318 1319 if (mfi.size_tcpinfo_user) { 1320 tcp_get_info(ssk, &tcp_info); 1321 if (copy_to_user(tcpinfoptr, &tcp_info, 1322 mfi.size_tcpinfo_user)) 1323 goto fail_release; 1324 } 1325 1326 tcpinfoptr += mfi.size_tcpinfo_user; 1327 sfinfoptr += mfi.size_sfinfo_user; 1328 } 1329 release_sock(sk); 1330 1331 mfi.num_subflows = sfcount; 1332 if (mptcp_put_full_info(&mfi, optval, copylen, optlen)) 1333 return -EFAULT; 1334 1335 return 0; 1336 1337 fail_release: 1338 release_sock(sk); 1339 return -EFAULT; 1340 } 1341 1342 static int mptcp_put_int_option(struct mptcp_sock *msk, char __user *optval, 1343 int __user *optlen, int val) 1344 { 1345 int len; 1346 1347 if (get_user(len, optlen)) 1348 return -EFAULT; 1349 if (len < 0) 1350 return -EINVAL; 1351 1352 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1353 unsigned char ucval = (unsigned char)val; 1354 1355 len = 1; 1356 if (put_user(len, optlen)) 1357 return -EFAULT; 1358 if (copy_to_user(optval, &ucval, 1)) 1359 return -EFAULT; 1360 } else { 1361 len = min_t(unsigned int, len, sizeof(int)); 1362 if (put_user(len, optlen)) 1363 return -EFAULT; 1364 if (copy_to_user(optval, &val, len)) 1365 return -EFAULT; 1366 } 1367 1368 return 0; 1369 } 1370 1371 static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 1372 char __user *optval, int __user *optlen) 1373 { 1374 struct sock *sk = (void *)msk; 1375 1376 switch (optname) { 1377 case TCP_ULP: 1378 case TCP_CONGESTION: 1379 case TCP_INFO: 1380 case TCP_CC_INFO: 1381 case TCP_DEFER_ACCEPT: 1382 case TCP_FASTOPEN: 1383 case TCP_FASTOPEN_CONNECT: 1384 case TCP_FASTOPEN_KEY: 1385 case TCP_FASTOPEN_NO_COOKIE: 1386 return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname, 1387 optval, optlen); 1388 case TCP_INQ: 1389 return mptcp_put_int_option(msk, optval, optlen, msk->recvmsg_inq); 1390 case TCP_CORK: 1391 return mptcp_put_int_option(msk, optval, optlen, msk->cork); 1392 case TCP_NODELAY: 1393 return mptcp_put_int_option(msk, optval, optlen, msk->nodelay); 1394 case TCP_KEEPIDLE: 1395 return mptcp_put_int_option(msk, optval, optlen, 1396 msk->keepalive_idle ? : 1397 READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_keepalive_time) / HZ); 1398 case TCP_KEEPINTVL: 1399 return mptcp_put_int_option(msk, optval, optlen, 1400 msk->keepalive_intvl ? : 1401 READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_keepalive_intvl) / HZ); 1402 case TCP_KEEPCNT: 1403 return mptcp_put_int_option(msk, optval, optlen, 1404 msk->keepalive_cnt ? : 1405 READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_keepalive_probes)); 1406 case TCP_NOTSENT_LOWAT: 1407 return mptcp_put_int_option(msk, optval, optlen, msk->notsent_lowat); 1408 case TCP_IS_MPTCP: 1409 return mptcp_put_int_option(msk, optval, optlen, 1); 1410 } 1411 return -EOPNOTSUPP; 1412 } 1413 1414 static int mptcp_getsockopt_v4(struct mptcp_sock *msk, int optname, 1415 char __user *optval, int __user *optlen) 1416 { 1417 struct sock *sk = (void *)msk; 1418 1419 switch (optname) { 1420 case IP_TOS: 1421 return mptcp_put_int_option(msk, optval, optlen, READ_ONCE(inet_sk(sk)->tos)); 1422 case IP_BIND_ADDRESS_NO_PORT: 1423 return mptcp_put_int_option(msk, optval, optlen, 1424 inet_test_bit(BIND_ADDRESS_NO_PORT, sk)); 1425 case IP_LOCAL_PORT_RANGE: 1426 return mptcp_put_int_option(msk, optval, optlen, 1427 READ_ONCE(inet_sk(sk)->local_port_range)); 1428 } 1429 1430 return -EOPNOTSUPP; 1431 } 1432 1433 static int mptcp_getsockopt_sol_mptcp(struct mptcp_sock *msk, int optname, 1434 char __user *optval, int __user *optlen) 1435 { 1436 switch (optname) { 1437 case MPTCP_INFO: 1438 return mptcp_getsockopt_info(msk, optval, optlen); 1439 case MPTCP_FULL_INFO: 1440 return mptcp_getsockopt_full_info(msk, optval, optlen); 1441 case MPTCP_TCPINFO: 1442 return mptcp_getsockopt_tcpinfo(msk, optval, optlen); 1443 case MPTCP_SUBFLOW_ADDRS: 1444 return mptcp_getsockopt_subflow_addrs(msk, optval, optlen); 1445 } 1446 1447 return -EOPNOTSUPP; 1448 } 1449 1450 int mptcp_getsockopt(struct sock *sk, int level, int optname, 1451 char __user *optval, int __user *option) 1452 { 1453 struct mptcp_sock *msk = mptcp_sk(sk); 1454 struct sock *ssk; 1455 1456 pr_debug("msk=%p\n", msk); 1457 1458 /* @@ the meaning of setsockopt() when the socket is connected and 1459 * there are multiple subflows is not yet defined. It is up to the 1460 * MPTCP-level socket to configure the subflows until the subflow 1461 * is in TCP fallback, when socket options are passed through 1462 * to the one remaining subflow. 1463 */ 1464 lock_sock(sk); 1465 ssk = __mptcp_tcp_fallback(msk); 1466 release_sock(sk); 1467 if (ssk) 1468 return tcp_getsockopt(ssk, level, optname, optval, option); 1469 1470 if (level == SOL_IP) 1471 return mptcp_getsockopt_v4(msk, optname, optval, option); 1472 if (level == SOL_TCP) 1473 return mptcp_getsockopt_sol_tcp(msk, optname, optval, option); 1474 if (level == SOL_MPTCP) 1475 return mptcp_getsockopt_sol_mptcp(msk, optname, optval, option); 1476 return -EOPNOTSUPP; 1477 } 1478 1479 static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk) 1480 { 1481 static const unsigned int tx_rx_locks = SOCK_RCVBUF_LOCK | SOCK_SNDBUF_LOCK; 1482 struct sock *sk = (struct sock *)msk; 1483 1484 if (ssk->sk_prot->keepalive) { 1485 if (sock_flag(sk, SOCK_KEEPOPEN)) 1486 ssk->sk_prot->keepalive(ssk, 1); 1487 else 1488 ssk->sk_prot->keepalive(ssk, 0); 1489 } 1490 1491 ssk->sk_priority = sk->sk_priority; 1492 ssk->sk_bound_dev_if = sk->sk_bound_dev_if; 1493 ssk->sk_incoming_cpu = sk->sk_incoming_cpu; 1494 ssk->sk_ipv6only = sk->sk_ipv6only; 1495 __ip_sock_set_tos(ssk, inet_sk(sk)->tos); 1496 1497 if (sk->sk_userlocks & tx_rx_locks) { 1498 ssk->sk_userlocks |= sk->sk_userlocks & tx_rx_locks; 1499 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) { 1500 WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); 1501 mptcp_subflow_ctx(ssk)->cached_sndbuf = sk->sk_sndbuf; 1502 } 1503 if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) 1504 WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); 1505 } 1506 1507 if (sock_flag(sk, SOCK_LINGER)) { 1508 ssk->sk_lingertime = sk->sk_lingertime; 1509 sock_set_flag(ssk, SOCK_LINGER); 1510 } else { 1511 sock_reset_flag(ssk, SOCK_LINGER); 1512 } 1513 1514 if (sk->sk_mark != ssk->sk_mark) { 1515 ssk->sk_mark = sk->sk_mark; 1516 sk_dst_reset(ssk); 1517 } 1518 1519 sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG)); 1520 1521 if (inet_csk(sk)->icsk_ca_ops != inet_csk(ssk)->icsk_ca_ops) 1522 tcp_set_congestion_control(ssk, msk->ca_name, false, true); 1523 __tcp_sock_set_cork(ssk, !!msk->cork); 1524 __tcp_sock_set_nodelay(ssk, !!msk->nodelay); 1525 tcp_sock_set_keepidle_locked(ssk, msk->keepalive_idle); 1526 tcp_sock_set_keepintvl(ssk, msk->keepalive_intvl); 1527 tcp_sock_set_keepcnt(ssk, msk->keepalive_cnt); 1528 1529 inet_assign_bit(TRANSPARENT, ssk, inet_test_bit(TRANSPARENT, sk)); 1530 inet_assign_bit(FREEBIND, ssk, inet_test_bit(FREEBIND, sk)); 1531 inet_assign_bit(BIND_ADDRESS_NO_PORT, ssk, inet_test_bit(BIND_ADDRESS_NO_PORT, sk)); 1532 WRITE_ONCE(inet_sk(ssk)->local_port_range, READ_ONCE(inet_sk(sk)->local_port_range)); 1533 } 1534 1535 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk) 1536 { 1537 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1538 1539 msk_owned_by_me(msk); 1540 1541 ssk->sk_rcvlowat = 0; 1542 1543 /* subflows must ignore any latency-related settings: will not affect 1544 * the user-space - only the msk is relevant - but will foul the 1545 * mptcp scheduler 1546 */ 1547 tcp_sk(ssk)->notsent_lowat = UINT_MAX; 1548 1549 if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { 1550 sync_socket_options(msk, ssk); 1551 1552 subflow->setsockopt_seq = msk->setsockopt_seq; 1553 } 1554 } 1555 1556 /* unfortunately this is different enough from the tcp version so 1557 * that we can't factor it out 1558 */ 1559 int mptcp_set_rcvlowat(struct sock *sk, int val) 1560 { 1561 struct mptcp_subflow_context *subflow; 1562 int space, cap; 1563 1564 /* bpf can land here with a wrong sk type */ 1565 if (sk->sk_protocol == IPPROTO_TCP) 1566 return -EINVAL; 1567 1568 if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) 1569 cap = sk->sk_rcvbuf >> 1; 1570 else 1571 cap = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_rmem[2]) >> 1; 1572 val = min(val, cap); 1573 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); 1574 1575 /* Check if we need to signal EPOLLIN right now */ 1576 if (mptcp_epollin_ready(sk)) 1577 sk->sk_data_ready(sk); 1578 1579 if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) 1580 return 0; 1581 1582 space = mptcp_space_from_win(sk, val); 1583 if (space <= sk->sk_rcvbuf) 1584 return 0; 1585 1586 /* propagate the rcvbuf changes to all the subflows */ 1587 WRITE_ONCE(sk->sk_rcvbuf, space); 1588 mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 1589 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1590 bool slow; 1591 1592 slow = lock_sock_fast(ssk); 1593 WRITE_ONCE(ssk->sk_rcvbuf, space); 1594 WRITE_ONCE(tcp_sk(ssk)->window_clamp, val); 1595 unlock_sock_fast(ssk, slow); 1596 } 1597 return 0; 1598 } 1599