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 19 static struct sock *__mptcp_tcp_fallback(struct mptcp_sock *msk) 20 { 21 msk_owned_by_me(msk); 22 23 if (likely(!__mptcp_check_fallback(msk))) 24 return NULL; 25 26 return msk->first; 27 } 28 29 static u32 sockopt_seq_reset(const struct sock *sk) 30 { 31 sock_owned_by_me(sk); 32 33 /* Highbits contain state. Allows to distinguish sockopt_seq 34 * of listener and established: 35 * s0 = new_listener() 36 * sockopt(s0) - seq is 1 37 * s1 = accept(s0) - s1 inherits seq 1 if listener sk (s0) 38 * sockopt(s0) - seq increments to 2 on s0 39 * sockopt(s1) // seq increments to 2 on s1 (different option) 40 * new ssk completes join, inherits options from s0 // seq 2 41 * Needs sync from mptcp join logic, but ssk->seq == msk->seq 42 * 43 * Set High order bits to sk_state so ssk->seq == msk->seq test 44 * will fail. 45 */ 46 47 return (u32)sk->sk_state << 24u; 48 } 49 50 static void sockopt_seq_inc(struct mptcp_sock *msk) 51 { 52 u32 seq = (msk->setsockopt_seq + 1) & 0x00ffffff; 53 54 msk->setsockopt_seq = sockopt_seq_reset((struct sock *)msk) + seq; 55 } 56 57 static int mptcp_get_int_option(struct mptcp_sock *msk, sockptr_t optval, 58 unsigned int optlen, int *val) 59 { 60 if (optlen < sizeof(int)) 61 return -EINVAL; 62 63 if (copy_from_sockptr(val, optval, sizeof(*val))) 64 return -EFAULT; 65 66 return 0; 67 } 68 69 static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, int val) 70 { 71 struct mptcp_subflow_context *subflow; 72 struct sock *sk = (struct sock *)msk; 73 74 lock_sock(sk); 75 sockopt_seq_inc(msk); 76 77 mptcp_for_each_subflow(msk, subflow) { 78 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 79 bool slow = lock_sock_fast(ssk); 80 81 switch (optname) { 82 case SO_DEBUG: 83 sock_valbool_flag(ssk, SOCK_DBG, !!val); 84 break; 85 case SO_KEEPALIVE: 86 if (ssk->sk_prot->keepalive) 87 ssk->sk_prot->keepalive(ssk, !!val); 88 sock_valbool_flag(ssk, SOCK_KEEPOPEN, !!val); 89 break; 90 case SO_PRIORITY: 91 ssk->sk_priority = val; 92 break; 93 case SO_SNDBUF: 94 case SO_SNDBUFFORCE: 95 ssk->sk_userlocks |= SOCK_SNDBUF_LOCK; 96 WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); 97 break; 98 case SO_RCVBUF: 99 case SO_RCVBUFFORCE: 100 ssk->sk_userlocks |= SOCK_RCVBUF_LOCK; 101 WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); 102 break; 103 case SO_MARK: 104 if (READ_ONCE(ssk->sk_mark) != sk->sk_mark) { 105 ssk->sk_mark = sk->sk_mark; 106 sk_dst_reset(ssk); 107 } 108 break; 109 case SO_INCOMING_CPU: 110 WRITE_ONCE(ssk->sk_incoming_cpu, val); 111 break; 112 } 113 114 subflow->setsockopt_seq = msk->setsockopt_seq; 115 unlock_sock_fast(ssk, slow); 116 } 117 118 release_sock(sk); 119 } 120 121 static int mptcp_sol_socket_intval(struct mptcp_sock *msk, int optname, int val) 122 { 123 sockptr_t optval = KERNEL_SOCKPTR(&val); 124 struct sock *sk = (struct sock *)msk; 125 int ret; 126 127 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 128 optval, sizeof(val)); 129 if (ret) 130 return ret; 131 132 mptcp_sol_socket_sync_intval(msk, optname, val); 133 return 0; 134 } 135 136 static void mptcp_so_incoming_cpu(struct mptcp_sock *msk, int val) 137 { 138 struct sock *sk = (struct sock *)msk; 139 140 WRITE_ONCE(sk->sk_incoming_cpu, val); 141 142 mptcp_sol_socket_sync_intval(msk, SO_INCOMING_CPU, val); 143 } 144 145 static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optname, int val) 146 { 147 sockptr_t optval = KERNEL_SOCKPTR(&val); 148 struct mptcp_subflow_context *subflow; 149 struct sock *sk = (struct sock *)msk; 150 int ret; 151 152 ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 153 optval, sizeof(val)); 154 if (ret) 155 return ret; 156 157 lock_sock(sk); 158 mptcp_for_each_subflow(msk, subflow) { 159 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 160 bool slow = lock_sock_fast(ssk); 161 162 sock_set_timestamp(sk, optname, !!val); 163 unlock_sock_fast(ssk, slow); 164 } 165 166 release_sock(sk); 167 return 0; 168 } 169 170 static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname, 171 sockptr_t optval, 172 unsigned int optlen) 173 { 174 int val, ret; 175 176 ret = mptcp_get_int_option(msk, optval, optlen, &val); 177 if (ret) 178 return ret; 179 180 switch (optname) { 181 case SO_KEEPALIVE: 182 mptcp_sol_socket_sync_intval(msk, optname, val); 183 return 0; 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 socket *ssock; 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 ssock = __mptcp_nmpc_socket(msk); 304 if (!ssock) { 305 release_sock(sk); 306 return -EINVAL; 307 } 308 309 ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen); 310 if (ret == 0) { 311 if (optname == SO_REUSEPORT) 312 sk->sk_reuseport = ssock->sk->sk_reuseport; 313 else if (optname == SO_REUSEADDR) 314 sk->sk_reuse = ssock->sk->sk_reuse; 315 else if (optname == SO_BINDTODEVICE) 316 sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if; 317 else if (optname == SO_BINDTOIFINDEX) 318 sk->sk_bound_dev_if = ssock->sk->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_PASSSEC: 359 case SO_RXQ_OVFL: 360 case SO_WIFI_STATUS: 361 case SO_NOFCS: 362 case SO_SELECT_ERR_QUEUE: 363 return 0; 364 } 365 366 /* SO_OOBINLINE is not supported, let's avoid the related mess 367 * SO_ATTACH_FILTER, SO_ATTACH_BPF, SO_ATTACH_REUSEPORT_CBPF, 368 * SO_DETACH_REUSEPORT_BPF, SO_DETACH_FILTER, SO_LOCK_FILTER, 369 * we must be careful with subflows 370 * 371 * SO_ATTACH_REUSEPORT_EBPF is not supported, at it checks 372 * explicitly the sk_protocol field 373 * 374 * SO_PEEK_OFF is unsupported, as it is for plain TCP 375 * SO_MAX_PACING_RATE is unsupported, we must be careful with subflows 376 * SO_CNX_ADVICE is currently unsupported, could possibly be relevant, 377 * but likely needs careful design 378 * 379 * SO_ZEROCOPY is currently unsupported, TODO in sndmsg 380 * SO_TXTIME is currently unsupported 381 */ 382 383 return -EOPNOTSUPP; 384 } 385 386 static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname, 387 sockptr_t optval, unsigned int optlen) 388 { 389 struct sock *sk = (struct sock *)msk; 390 int ret = -EOPNOTSUPP; 391 struct socket *ssock; 392 393 switch (optname) { 394 case IPV6_V6ONLY: 395 case IPV6_TRANSPARENT: 396 case IPV6_FREEBIND: 397 lock_sock(sk); 398 ssock = __mptcp_nmpc_socket(msk); 399 if (!ssock) { 400 release_sock(sk); 401 return -EINVAL; 402 } 403 404 ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen); 405 if (ret != 0) { 406 release_sock(sk); 407 return ret; 408 } 409 410 sockopt_seq_inc(msk); 411 412 switch (optname) { 413 case IPV6_V6ONLY: 414 sk->sk_ipv6only = ssock->sk->sk_ipv6only; 415 break; 416 case IPV6_TRANSPARENT: 417 inet_sk(sk)->transparent = inet_sk(ssock->sk)->transparent; 418 break; 419 case IPV6_FREEBIND: 420 inet_sk(sk)->freebind = inet_sk(ssock->sk)->freebind; 421 break; 422 } 423 424 release_sock(sk); 425 break; 426 } 427 428 return ret; 429 } 430 431 static bool mptcp_supported_sockopt(int level, int optname) 432 { 433 if (level == SOL_IP) { 434 switch (optname) { 435 /* should work fine */ 436 case IP_FREEBIND: 437 case IP_TRANSPARENT: 438 439 /* the following are control cmsg related */ 440 case IP_PKTINFO: 441 case IP_RECVTTL: 442 case IP_RECVTOS: 443 case IP_RECVOPTS: 444 case IP_RETOPTS: 445 case IP_PASSSEC: 446 case IP_RECVORIGDSTADDR: 447 case IP_CHECKSUM: 448 case IP_RECVFRAGSIZE: 449 450 /* common stuff that need some love */ 451 case IP_TOS: 452 case IP_TTL: 453 case IP_BIND_ADDRESS_NO_PORT: 454 case IP_MTU_DISCOVER: 455 case IP_RECVERR: 456 457 /* possibly less common may deserve some love */ 458 case IP_MINTTL: 459 460 /* the following is apparently a no-op for plain TCP */ 461 case IP_RECVERR_RFC4884: 462 return true; 463 } 464 465 /* IP_OPTIONS is not supported, needs subflow care */ 466 /* IP_HDRINCL, IP_NODEFRAG are not supported, RAW specific */ 467 /* IP_MULTICAST_TTL, IP_MULTICAST_LOOP, IP_UNICAST_IF, 468 * IP_ADD_MEMBERSHIP, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP, 469 * IP_DROP_SOURCE_MEMBERSHIP, IP_BLOCK_SOURCE, IP_UNBLOCK_SOURCE, 470 * MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP MCAST_JOIN_SOURCE_GROUP, 471 * MCAST_LEAVE_SOURCE_GROUP, MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, 472 * MCAST_MSFILTER, IP_MULTICAST_ALL are not supported, better not deal 473 * with mcast stuff 474 */ 475 /* IP_IPSEC_POLICY, IP_XFRM_POLICY are nut supported, unrelated here */ 476 return false; 477 } 478 if (level == SOL_IPV6) { 479 switch (optname) { 480 case IPV6_V6ONLY: 481 482 /* the following are control cmsg related */ 483 case IPV6_RECVPKTINFO: 484 case IPV6_2292PKTINFO: 485 case IPV6_RECVHOPLIMIT: 486 case IPV6_2292HOPLIMIT: 487 case IPV6_RECVRTHDR: 488 case IPV6_2292RTHDR: 489 case IPV6_RECVHOPOPTS: 490 case IPV6_2292HOPOPTS: 491 case IPV6_RECVDSTOPTS: 492 case IPV6_2292DSTOPTS: 493 case IPV6_RECVTCLASS: 494 case IPV6_FLOWINFO: 495 case IPV6_RECVPATHMTU: 496 case IPV6_RECVORIGDSTADDR: 497 case IPV6_RECVFRAGSIZE: 498 499 /* the following ones need some love but are quite common */ 500 case IPV6_TCLASS: 501 case IPV6_TRANSPARENT: 502 case IPV6_FREEBIND: 503 case IPV6_PKTINFO: 504 case IPV6_2292PKTOPTIONS: 505 case IPV6_UNICAST_HOPS: 506 case IPV6_MTU_DISCOVER: 507 case IPV6_MTU: 508 case IPV6_RECVERR: 509 case IPV6_FLOWINFO_SEND: 510 case IPV6_FLOWLABEL_MGR: 511 case IPV6_MINHOPCOUNT: 512 case IPV6_DONTFRAG: 513 case IPV6_AUTOFLOWLABEL: 514 515 /* the following one is a no-op for plain TCP */ 516 case IPV6_RECVERR_RFC4884: 517 return true; 518 } 519 520 /* IPV6_HOPOPTS, IPV6_RTHDRDSTOPTS, IPV6_RTHDR, IPV6_DSTOPTS are 521 * not supported 522 */ 523 /* IPV6_MULTICAST_HOPS, IPV6_MULTICAST_LOOP, IPV6_UNICAST_IF, 524 * IPV6_MULTICAST_IF, IPV6_ADDRFORM, 525 * IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST, 526 * IPV6_LEAVE_ANYCAST, IPV6_MULTICAST_ALL, MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP, 527 * MCAST_JOIN_SOURCE_GROUP, MCAST_LEAVE_SOURCE_GROUP, 528 * MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, MCAST_MSFILTER 529 * are not supported better not deal with mcast 530 */ 531 /* IPV6_ROUTER_ALERT, IPV6_ROUTER_ALERT_ISOLATE are not supported, since are evil */ 532 533 /* IPV6_IPSEC_POLICY, IPV6_XFRM_POLICY are not supported */ 534 /* IPV6_ADDR_PREFERENCES is not supported, we must be careful with subflows */ 535 return false; 536 } 537 if (level == SOL_TCP) { 538 switch (optname) { 539 /* the following are no-op or should work just fine */ 540 case TCP_THIN_DUPACK: 541 case TCP_DEFER_ACCEPT: 542 543 /* the following need some love */ 544 case TCP_MAXSEG: 545 case TCP_NODELAY: 546 case TCP_THIN_LINEAR_TIMEOUTS: 547 case TCP_CONGESTION: 548 case TCP_CORK: 549 case TCP_KEEPIDLE: 550 case TCP_KEEPINTVL: 551 case TCP_KEEPCNT: 552 case TCP_SYNCNT: 553 case TCP_SAVE_SYN: 554 case TCP_LINGER2: 555 case TCP_WINDOW_CLAMP: 556 case TCP_QUICKACK: 557 case TCP_USER_TIMEOUT: 558 case TCP_TIMESTAMP: 559 case TCP_NOTSENT_LOWAT: 560 case TCP_TX_DELAY: 561 case TCP_INQ: 562 case TCP_FASTOPEN: 563 case TCP_FASTOPEN_CONNECT: 564 case TCP_FASTOPEN_KEY: 565 case TCP_FASTOPEN_NO_COOKIE: 566 return true; 567 } 568 569 /* TCP_MD5SIG, TCP_MD5SIG_EXT are not supported, MD5 is not compatible with MPTCP */ 570 571 /* TCP_REPAIR, TCP_REPAIR_QUEUE, TCP_QUEUE_SEQ, TCP_REPAIR_OPTIONS, 572 * TCP_REPAIR_WINDOW are not supported, better avoid this mess 573 */ 574 } 575 return false; 576 } 577 578 static int mptcp_setsockopt_sol_tcp_congestion(struct mptcp_sock *msk, sockptr_t optval, 579 unsigned int optlen) 580 { 581 struct mptcp_subflow_context *subflow; 582 struct sock *sk = (struct sock *)msk; 583 char name[TCP_CA_NAME_MAX]; 584 bool cap_net_admin; 585 int ret; 586 587 if (optlen < 1) 588 return -EINVAL; 589 590 ret = strncpy_from_sockptr(name, optval, 591 min_t(long, TCP_CA_NAME_MAX - 1, optlen)); 592 if (ret < 0) 593 return -EFAULT; 594 595 name[ret] = 0; 596 597 cap_net_admin = ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN); 598 599 ret = 0; 600 lock_sock(sk); 601 sockopt_seq_inc(msk); 602 mptcp_for_each_subflow(msk, subflow) { 603 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 604 int err; 605 606 lock_sock(ssk); 607 err = tcp_set_congestion_control(ssk, name, true, cap_net_admin); 608 if (err < 0 && ret == 0) 609 ret = err; 610 subflow->setsockopt_seq = msk->setsockopt_seq; 611 release_sock(ssk); 612 } 613 614 if (ret == 0) 615 strcpy(msk->ca_name, name); 616 617 release_sock(sk); 618 return ret; 619 } 620 621 static int mptcp_setsockopt_sol_tcp_cork(struct mptcp_sock *msk, sockptr_t optval, 622 unsigned int optlen) 623 { 624 struct mptcp_subflow_context *subflow; 625 struct sock *sk = (struct sock *)msk; 626 int val; 627 628 if (optlen < sizeof(int)) 629 return -EINVAL; 630 631 if (copy_from_sockptr(&val, optval, sizeof(val))) 632 return -EFAULT; 633 634 lock_sock(sk); 635 sockopt_seq_inc(msk); 636 msk->cork = !!val; 637 mptcp_for_each_subflow(msk, subflow) { 638 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 639 640 lock_sock(ssk); 641 __tcp_sock_set_cork(ssk, !!val); 642 release_sock(ssk); 643 } 644 if (!val) 645 mptcp_check_and_set_pending(sk); 646 release_sock(sk); 647 648 return 0; 649 } 650 651 static int mptcp_setsockopt_sol_tcp_nodelay(struct mptcp_sock *msk, sockptr_t optval, 652 unsigned int optlen) 653 { 654 struct mptcp_subflow_context *subflow; 655 struct sock *sk = (struct sock *)msk; 656 int val; 657 658 if (optlen < sizeof(int)) 659 return -EINVAL; 660 661 if (copy_from_sockptr(&val, optval, sizeof(val))) 662 return -EFAULT; 663 664 lock_sock(sk); 665 sockopt_seq_inc(msk); 666 msk->nodelay = !!val; 667 mptcp_for_each_subflow(msk, subflow) { 668 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 669 670 lock_sock(ssk); 671 __tcp_sock_set_nodelay(ssk, !!val); 672 release_sock(ssk); 673 } 674 if (val) 675 mptcp_check_and_set_pending(sk); 676 release_sock(sk); 677 678 return 0; 679 } 680 681 static int mptcp_setsockopt_sol_ip_set_transparent(struct mptcp_sock *msk, int optname, 682 sockptr_t optval, unsigned int optlen) 683 { 684 struct sock *sk = (struct sock *)msk; 685 struct inet_sock *issk; 686 struct socket *ssock; 687 int err; 688 689 err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen); 690 if (err != 0) 691 return err; 692 693 lock_sock(sk); 694 695 ssock = __mptcp_nmpc_socket(msk); 696 if (!ssock) { 697 release_sock(sk); 698 return -EINVAL; 699 } 700 701 issk = inet_sk(ssock->sk); 702 703 switch (optname) { 704 case IP_FREEBIND: 705 issk->freebind = inet_sk(sk)->freebind; 706 break; 707 case IP_TRANSPARENT: 708 issk->transparent = inet_sk(sk)->transparent; 709 break; 710 default: 711 release_sock(sk); 712 WARN_ON_ONCE(1); 713 return -EOPNOTSUPP; 714 } 715 716 sockopt_seq_inc(msk); 717 release_sock(sk); 718 return 0; 719 } 720 721 static int mptcp_setsockopt_v4_set_tos(struct mptcp_sock *msk, int optname, 722 sockptr_t optval, unsigned int optlen) 723 { 724 struct mptcp_subflow_context *subflow; 725 struct sock *sk = (struct sock *)msk; 726 int err, val; 727 728 err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen); 729 730 if (err != 0) 731 return err; 732 733 lock_sock(sk); 734 sockopt_seq_inc(msk); 735 val = inet_sk(sk)->tos; 736 mptcp_for_each_subflow(msk, subflow) { 737 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 738 739 __ip_sock_set_tos(ssk, val); 740 } 741 release_sock(sk); 742 743 return 0; 744 } 745 746 static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname, 747 sockptr_t optval, unsigned int optlen) 748 { 749 switch (optname) { 750 case IP_FREEBIND: 751 case IP_TRANSPARENT: 752 return mptcp_setsockopt_sol_ip_set_transparent(msk, optname, optval, optlen); 753 case IP_TOS: 754 return mptcp_setsockopt_v4_set_tos(msk, optname, optval, optlen); 755 } 756 757 return -EOPNOTSUPP; 758 } 759 760 static int mptcp_setsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, 761 sockptr_t optval, unsigned int optlen) 762 { 763 struct sock *sk = (struct sock *)msk; 764 struct socket *sock; 765 int ret = -EINVAL; 766 767 /* Limit to first subflow, before the connection establishment */ 768 lock_sock(sk); 769 sock = __mptcp_nmpc_socket(msk); 770 if (!sock) 771 goto unlock; 772 773 ret = tcp_setsockopt(sock->sk, level, optname, optval, optlen); 774 775 unlock: 776 release_sock(sk); 777 return ret; 778 } 779 780 static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 781 sockptr_t optval, unsigned int optlen) 782 { 783 struct sock *sk = (void *)msk; 784 int ret, val; 785 786 switch (optname) { 787 case TCP_INQ: 788 ret = mptcp_get_int_option(msk, optval, optlen, &val); 789 if (ret) 790 return ret; 791 if (val < 0 || val > 1) 792 return -EINVAL; 793 794 lock_sock(sk); 795 msk->recvmsg_inq = !!val; 796 release_sock(sk); 797 return 0; 798 case TCP_ULP: 799 return -EOPNOTSUPP; 800 case TCP_CONGESTION: 801 return mptcp_setsockopt_sol_tcp_congestion(msk, optval, optlen); 802 case TCP_CORK: 803 return mptcp_setsockopt_sol_tcp_cork(msk, optval, optlen); 804 case TCP_NODELAY: 805 return mptcp_setsockopt_sol_tcp_nodelay(msk, optval, optlen); 806 case TCP_DEFER_ACCEPT: 807 /* See tcp.c: TCP_DEFER_ACCEPT does not fail */ 808 mptcp_setsockopt_first_sf_only(msk, SOL_TCP, optname, optval, optlen); 809 return 0; 810 case TCP_FASTOPEN: 811 case TCP_FASTOPEN_CONNECT: 812 case TCP_FASTOPEN_KEY: 813 case TCP_FASTOPEN_NO_COOKIE: 814 return mptcp_setsockopt_first_sf_only(msk, SOL_TCP, optname, 815 optval, optlen); 816 } 817 818 return -EOPNOTSUPP; 819 } 820 821 int mptcp_setsockopt(struct sock *sk, int level, int optname, 822 sockptr_t optval, unsigned int optlen) 823 { 824 struct mptcp_sock *msk = mptcp_sk(sk); 825 struct sock *ssk; 826 827 pr_debug("msk=%p", msk); 828 829 if (level == SOL_SOCKET) 830 return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen); 831 832 if (!mptcp_supported_sockopt(level, optname)) 833 return -ENOPROTOOPT; 834 835 /* @@ the meaning of setsockopt() when the socket is connected and 836 * there are multiple subflows is not yet defined. It is up to the 837 * MPTCP-level socket to configure the subflows until the subflow 838 * is in TCP fallback, when TCP socket options are passed through 839 * to the one remaining subflow. 840 */ 841 lock_sock(sk); 842 ssk = __mptcp_tcp_fallback(msk); 843 release_sock(sk); 844 if (ssk) 845 return tcp_setsockopt(ssk, level, optname, optval, optlen); 846 847 if (level == SOL_IP) 848 return mptcp_setsockopt_v4(msk, optname, optval, optlen); 849 850 if (level == SOL_IPV6) 851 return mptcp_setsockopt_v6(msk, optname, optval, optlen); 852 853 if (level == SOL_TCP) 854 return mptcp_setsockopt_sol_tcp(msk, optname, optval, optlen); 855 856 return -EOPNOTSUPP; 857 } 858 859 static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, 860 char __user *optval, int __user *optlen) 861 { 862 struct sock *sk = (struct sock *)msk; 863 struct socket *ssock; 864 int ret = -EINVAL; 865 struct sock *ssk; 866 867 lock_sock(sk); 868 ssk = msk->first; 869 if (ssk) { 870 ret = tcp_getsockopt(ssk, level, optname, optval, optlen); 871 goto out; 872 } 873 874 ssock = __mptcp_nmpc_socket(msk); 875 if (!ssock) 876 goto out; 877 878 ret = tcp_getsockopt(ssock->sk, level, optname, optval, optlen); 879 880 out: 881 release_sock(sk); 882 return ret; 883 } 884 885 void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info) 886 { 887 u32 flags = 0; 888 u8 val; 889 890 memset(info, 0, sizeof(*info)); 891 892 info->mptcpi_subflows = READ_ONCE(msk->pm.subflows); 893 info->mptcpi_add_addr_signal = READ_ONCE(msk->pm.add_addr_signaled); 894 info->mptcpi_add_addr_accepted = READ_ONCE(msk->pm.add_addr_accepted); 895 info->mptcpi_local_addr_used = READ_ONCE(msk->pm.local_addr_used); 896 info->mptcpi_subflows_max = mptcp_pm_get_subflows_max(msk); 897 val = mptcp_pm_get_add_addr_signal_max(msk); 898 info->mptcpi_add_addr_signal_max = val; 899 val = mptcp_pm_get_add_addr_accept_max(msk); 900 info->mptcpi_add_addr_accepted_max = val; 901 info->mptcpi_local_addr_max = mptcp_pm_get_local_addr_max(msk); 902 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) 903 flags |= MPTCP_INFO_FLAG_FALLBACK; 904 if (READ_ONCE(msk->can_ack)) 905 flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED; 906 info->mptcpi_flags = flags; 907 info->mptcpi_token = READ_ONCE(msk->token); 908 info->mptcpi_write_seq = READ_ONCE(msk->write_seq); 909 info->mptcpi_snd_una = READ_ONCE(msk->snd_una); 910 info->mptcpi_rcv_nxt = READ_ONCE(msk->ack_seq); 911 info->mptcpi_csum_enabled = READ_ONCE(msk->csum_enabled); 912 } 913 EXPORT_SYMBOL_GPL(mptcp_diag_fill_info); 914 915 static int mptcp_getsockopt_info(struct mptcp_sock *msk, char __user *optval, int __user *optlen) 916 { 917 struct mptcp_info m_info; 918 int len; 919 920 if (get_user(len, optlen)) 921 return -EFAULT; 922 923 len = min_t(unsigned int, len, sizeof(struct mptcp_info)); 924 925 mptcp_diag_fill_info(msk, &m_info); 926 927 if (put_user(len, optlen)) 928 return -EFAULT; 929 930 if (copy_to_user(optval, &m_info, len)) 931 return -EFAULT; 932 933 return 0; 934 } 935 936 static int mptcp_put_subflow_data(struct mptcp_subflow_data *sfd, 937 char __user *optval, 938 u32 copied, 939 int __user *optlen) 940 { 941 u32 copylen = min_t(u32, sfd->size_subflow_data, sizeof(*sfd)); 942 943 if (copied) 944 copied += sfd->size_subflow_data; 945 else 946 copied = copylen; 947 948 if (put_user(copied, optlen)) 949 return -EFAULT; 950 951 if (copy_to_user(optval, sfd, copylen)) 952 return -EFAULT; 953 954 return 0; 955 } 956 957 static int mptcp_get_subflow_data(struct mptcp_subflow_data *sfd, 958 char __user *optval, int __user *optlen) 959 { 960 int len, copylen; 961 962 if (get_user(len, optlen)) 963 return -EFAULT; 964 965 /* if mptcp_subflow_data size is changed, need to adjust 966 * this function to deal with programs using old version. 967 */ 968 BUILD_BUG_ON(sizeof(*sfd) != MIN_INFO_OPTLEN_SIZE); 969 970 if (len < MIN_INFO_OPTLEN_SIZE) 971 return -EINVAL; 972 973 memset(sfd, 0, sizeof(*sfd)); 974 975 copylen = min_t(unsigned int, len, sizeof(*sfd)); 976 if (copy_from_user(sfd, optval, copylen)) 977 return -EFAULT; 978 979 /* size_subflow_data is u32, but len is signed */ 980 if (sfd->size_subflow_data > INT_MAX || 981 sfd->size_user > INT_MAX) 982 return -EINVAL; 983 984 if (sfd->size_subflow_data < MIN_INFO_OPTLEN_SIZE || 985 sfd->size_subflow_data > len) 986 return -EINVAL; 987 988 if (sfd->num_subflows || sfd->size_kernel) 989 return -EINVAL; 990 991 return len - sfd->size_subflow_data; 992 } 993 994 static int mptcp_getsockopt_tcpinfo(struct mptcp_sock *msk, char __user *optval, 995 int __user *optlen) 996 { 997 struct mptcp_subflow_context *subflow; 998 struct sock *sk = (struct sock *)msk; 999 unsigned int sfcount = 0, copied = 0; 1000 struct mptcp_subflow_data sfd; 1001 char __user *infoptr; 1002 int len; 1003 1004 len = mptcp_get_subflow_data(&sfd, optval, optlen); 1005 if (len < 0) 1006 return len; 1007 1008 sfd.size_kernel = sizeof(struct tcp_info); 1009 sfd.size_user = min_t(unsigned int, sfd.size_user, 1010 sizeof(struct tcp_info)); 1011 1012 infoptr = optval + sfd.size_subflow_data; 1013 1014 lock_sock(sk); 1015 1016 mptcp_for_each_subflow(msk, subflow) { 1017 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1018 1019 ++sfcount; 1020 1021 if (len && len >= sfd.size_user) { 1022 struct tcp_info info; 1023 1024 tcp_get_info(ssk, &info); 1025 1026 if (copy_to_user(infoptr, &info, sfd.size_user)) { 1027 release_sock(sk); 1028 return -EFAULT; 1029 } 1030 1031 infoptr += sfd.size_user; 1032 copied += sfd.size_user; 1033 len -= sfd.size_user; 1034 } 1035 } 1036 1037 release_sock(sk); 1038 1039 sfd.num_subflows = sfcount; 1040 1041 if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) 1042 return -EFAULT; 1043 1044 return 0; 1045 } 1046 1047 static void mptcp_get_sub_addrs(const struct sock *sk, struct mptcp_subflow_addrs *a) 1048 { 1049 struct inet_sock *inet = inet_sk(sk); 1050 1051 memset(a, 0, sizeof(*a)); 1052 1053 if (sk->sk_family == AF_INET) { 1054 a->sin_local.sin_family = AF_INET; 1055 a->sin_local.sin_port = inet->inet_sport; 1056 a->sin_local.sin_addr.s_addr = inet->inet_rcv_saddr; 1057 1058 if (!a->sin_local.sin_addr.s_addr) 1059 a->sin_local.sin_addr.s_addr = inet->inet_saddr; 1060 1061 a->sin_remote.sin_family = AF_INET; 1062 a->sin_remote.sin_port = inet->inet_dport; 1063 a->sin_remote.sin_addr.s_addr = inet->inet_daddr; 1064 #if IS_ENABLED(CONFIG_IPV6) 1065 } else if (sk->sk_family == AF_INET6) { 1066 const struct ipv6_pinfo *np = inet6_sk(sk); 1067 1068 if (WARN_ON_ONCE(!np)) 1069 return; 1070 1071 a->sin6_local.sin6_family = AF_INET6; 1072 a->sin6_local.sin6_port = inet->inet_sport; 1073 1074 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 1075 a->sin6_local.sin6_addr = np->saddr; 1076 else 1077 a->sin6_local.sin6_addr = sk->sk_v6_rcv_saddr; 1078 1079 a->sin6_remote.sin6_family = AF_INET6; 1080 a->sin6_remote.sin6_port = inet->inet_dport; 1081 a->sin6_remote.sin6_addr = sk->sk_v6_daddr; 1082 #endif 1083 } 1084 } 1085 1086 static int mptcp_getsockopt_subflow_addrs(struct mptcp_sock *msk, char __user *optval, 1087 int __user *optlen) 1088 { 1089 struct mptcp_subflow_context *subflow; 1090 struct sock *sk = (struct sock *)msk; 1091 unsigned int sfcount = 0, copied = 0; 1092 struct mptcp_subflow_data sfd; 1093 char __user *addrptr; 1094 int len; 1095 1096 len = mptcp_get_subflow_data(&sfd, optval, optlen); 1097 if (len < 0) 1098 return len; 1099 1100 sfd.size_kernel = sizeof(struct mptcp_subflow_addrs); 1101 sfd.size_user = min_t(unsigned int, sfd.size_user, 1102 sizeof(struct mptcp_subflow_addrs)); 1103 1104 addrptr = optval + sfd.size_subflow_data; 1105 1106 lock_sock(sk); 1107 1108 mptcp_for_each_subflow(msk, subflow) { 1109 struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1110 1111 ++sfcount; 1112 1113 if (len && len >= sfd.size_user) { 1114 struct mptcp_subflow_addrs a; 1115 1116 mptcp_get_sub_addrs(ssk, &a); 1117 1118 if (copy_to_user(addrptr, &a, sfd.size_user)) { 1119 release_sock(sk); 1120 return -EFAULT; 1121 } 1122 1123 addrptr += sfd.size_user; 1124 copied += sfd.size_user; 1125 len -= sfd.size_user; 1126 } 1127 } 1128 1129 release_sock(sk); 1130 1131 sfd.num_subflows = sfcount; 1132 1133 if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) 1134 return -EFAULT; 1135 1136 return 0; 1137 } 1138 1139 static int mptcp_put_int_option(struct mptcp_sock *msk, char __user *optval, 1140 int __user *optlen, int val) 1141 { 1142 int len; 1143 1144 if (get_user(len, optlen)) 1145 return -EFAULT; 1146 if (len < 0) 1147 return -EINVAL; 1148 1149 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1150 unsigned char ucval = (unsigned char)val; 1151 1152 len = 1; 1153 if (put_user(len, optlen)) 1154 return -EFAULT; 1155 if (copy_to_user(optval, &ucval, 1)) 1156 return -EFAULT; 1157 } else { 1158 len = min_t(unsigned int, len, sizeof(int)); 1159 if (put_user(len, optlen)) 1160 return -EFAULT; 1161 if (copy_to_user(optval, &val, len)) 1162 return -EFAULT; 1163 } 1164 1165 return 0; 1166 } 1167 1168 static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 1169 char __user *optval, int __user *optlen) 1170 { 1171 switch (optname) { 1172 case TCP_ULP: 1173 case TCP_CONGESTION: 1174 case TCP_INFO: 1175 case TCP_CC_INFO: 1176 case TCP_DEFER_ACCEPT: 1177 case TCP_FASTOPEN: 1178 case TCP_FASTOPEN_CONNECT: 1179 case TCP_FASTOPEN_KEY: 1180 case TCP_FASTOPEN_NO_COOKIE: 1181 return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname, 1182 optval, optlen); 1183 case TCP_INQ: 1184 return mptcp_put_int_option(msk, optval, optlen, msk->recvmsg_inq); 1185 case TCP_CORK: 1186 return mptcp_put_int_option(msk, optval, optlen, msk->cork); 1187 case TCP_NODELAY: 1188 return mptcp_put_int_option(msk, optval, optlen, msk->nodelay); 1189 } 1190 return -EOPNOTSUPP; 1191 } 1192 1193 static int mptcp_getsockopt_v4(struct mptcp_sock *msk, int optname, 1194 char __user *optval, int __user *optlen) 1195 { 1196 struct sock *sk = (void *)msk; 1197 1198 switch (optname) { 1199 case IP_TOS: 1200 return mptcp_put_int_option(msk, optval, optlen, inet_sk(sk)->tos); 1201 } 1202 1203 return -EOPNOTSUPP; 1204 } 1205 1206 static int mptcp_getsockopt_sol_mptcp(struct mptcp_sock *msk, int optname, 1207 char __user *optval, int __user *optlen) 1208 { 1209 switch (optname) { 1210 case MPTCP_INFO: 1211 return mptcp_getsockopt_info(msk, optval, optlen); 1212 case MPTCP_TCPINFO: 1213 return mptcp_getsockopt_tcpinfo(msk, optval, optlen); 1214 case MPTCP_SUBFLOW_ADDRS: 1215 return mptcp_getsockopt_subflow_addrs(msk, optval, optlen); 1216 } 1217 1218 return -EOPNOTSUPP; 1219 } 1220 1221 int mptcp_getsockopt(struct sock *sk, int level, int optname, 1222 char __user *optval, int __user *option) 1223 { 1224 struct mptcp_sock *msk = mptcp_sk(sk); 1225 struct sock *ssk; 1226 1227 pr_debug("msk=%p", msk); 1228 1229 /* @@ the meaning of setsockopt() when the socket is connected and 1230 * there are multiple subflows is not yet defined. It is up to the 1231 * MPTCP-level socket to configure the subflows until the subflow 1232 * is in TCP fallback, when socket options are passed through 1233 * to the one remaining subflow. 1234 */ 1235 lock_sock(sk); 1236 ssk = __mptcp_tcp_fallback(msk); 1237 release_sock(sk); 1238 if (ssk) 1239 return tcp_getsockopt(ssk, level, optname, optval, option); 1240 1241 if (level == SOL_IP) 1242 return mptcp_getsockopt_v4(msk, optname, optval, option); 1243 if (level == SOL_TCP) 1244 return mptcp_getsockopt_sol_tcp(msk, optname, optval, option); 1245 if (level == SOL_MPTCP) 1246 return mptcp_getsockopt_sol_mptcp(msk, optname, optval, option); 1247 return -EOPNOTSUPP; 1248 } 1249 1250 static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk) 1251 { 1252 static const unsigned int tx_rx_locks = SOCK_RCVBUF_LOCK | SOCK_SNDBUF_LOCK; 1253 struct sock *sk = (struct sock *)msk; 1254 1255 if (ssk->sk_prot->keepalive) { 1256 if (sock_flag(sk, SOCK_KEEPOPEN)) 1257 ssk->sk_prot->keepalive(ssk, 1); 1258 else 1259 ssk->sk_prot->keepalive(ssk, 0); 1260 } 1261 1262 ssk->sk_priority = sk->sk_priority; 1263 ssk->sk_bound_dev_if = sk->sk_bound_dev_if; 1264 ssk->sk_incoming_cpu = sk->sk_incoming_cpu; 1265 ssk->sk_ipv6only = sk->sk_ipv6only; 1266 __ip_sock_set_tos(ssk, inet_sk(sk)->tos); 1267 1268 if (sk->sk_userlocks & tx_rx_locks) { 1269 ssk->sk_userlocks |= sk->sk_userlocks & tx_rx_locks; 1270 if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 1271 WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); 1272 if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) 1273 WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); 1274 } 1275 1276 if (sock_flag(sk, SOCK_LINGER)) { 1277 ssk->sk_lingertime = sk->sk_lingertime; 1278 sock_set_flag(ssk, SOCK_LINGER); 1279 } else { 1280 sock_reset_flag(ssk, SOCK_LINGER); 1281 } 1282 1283 if (sk->sk_mark != ssk->sk_mark) { 1284 ssk->sk_mark = sk->sk_mark; 1285 sk_dst_reset(ssk); 1286 } 1287 1288 sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG)); 1289 1290 if (inet_csk(sk)->icsk_ca_ops != inet_csk(ssk)->icsk_ca_ops) 1291 tcp_set_congestion_control(ssk, msk->ca_name, false, true); 1292 __tcp_sock_set_cork(ssk, !!msk->cork); 1293 __tcp_sock_set_nodelay(ssk, !!msk->nodelay); 1294 1295 inet_sk(ssk)->transparent = inet_sk(sk)->transparent; 1296 inet_sk(ssk)->freebind = inet_sk(sk)->freebind; 1297 } 1298 1299 static void __mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk) 1300 { 1301 bool slow = lock_sock_fast(ssk); 1302 1303 sync_socket_options(msk, ssk); 1304 1305 unlock_sock_fast(ssk, slow); 1306 } 1307 1308 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk) 1309 { 1310 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1311 1312 msk_owned_by_me(msk); 1313 1314 if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { 1315 __mptcp_sockopt_sync(msk, ssk); 1316 1317 subflow->setsockopt_seq = msk->setsockopt_seq; 1318 } 1319 } 1320 1321 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk) 1322 { 1323 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1324 1325 msk_owned_by_me(msk); 1326 1327 if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { 1328 sync_socket_options(msk, ssk); 1329 1330 subflow->setsockopt_seq = msk->setsockopt_seq; 1331 } 1332 } 1333