| 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_FREEBIND: |
| 1423 | return mptcp_put_int_option(msk, optval, optlen, |
| 1424 | inet_test_bit(FREEBIND, sk)); |
| 1425 | case IP_TRANSPARENT: |
| 1426 | return mptcp_put_int_option(msk, optval, optlen, |
| 1427 | inet_test_bit(TRANSPARENT, sk)); |
| 1428 | case IP_BIND_ADDRESS_NO_PORT: |
| 1429 | return mptcp_put_int_option(msk, optval, optlen, |
| 1430 | inet_test_bit(BIND_ADDRESS_NO_PORT, sk)); |
| 1431 | case IP_LOCAL_PORT_RANGE: |
| 1432 | return mptcp_put_int_option(msk, optval, optlen, |
| 1433 | READ_ONCE(inet_sk(sk)->local_port_range)); |
| 1434 | } |
| 1435 | |
| 1436 | return -EOPNOTSUPP; |
| 1437 | } |
| 1438 | |
| 1439 | static int mptcp_getsockopt_v6(struct mptcp_sock *msk, int optname, |
| 1440 | char __user *optval, int __user *optlen) |
| 1441 | { |
| 1442 | struct sock *sk = (void *)msk; |
| 1443 | |
| 1444 | switch (optname) { |
| 1445 | case IPV6_V6ONLY: |
| 1446 | return mptcp_put_int_option(msk, optval, optlen, |
| 1447 | sk->sk_ipv6only); |
| 1448 | case IPV6_TRANSPARENT: |
| 1449 | return mptcp_put_int_option(msk, optval, optlen, |
| 1450 | inet_test_bit(TRANSPARENT, sk)); |
| 1451 | case IPV6_FREEBIND: |
| 1452 | return mptcp_put_int_option(msk, optval, optlen, |
| 1453 | inet_test_bit(FREEBIND, sk)); |
| 1454 | } |
| 1455 | |
| 1456 | return -EOPNOTSUPP; |
| 1457 | } |
| 1458 | |
| 1459 | static int mptcp_getsockopt_sol_mptcp(struct mptcp_sock *msk, int optname, |
| 1460 | char __user *optval, int __user *optlen) |
| 1461 | { |
| 1462 | switch (optname) { |
| 1463 | case MPTCP_INFO: |
| 1464 | return mptcp_getsockopt_info(msk, optval, optlen); |
| 1465 | case MPTCP_FULL_INFO: |
| 1466 | return mptcp_getsockopt_full_info(msk, optval, optlen); |
| 1467 | case MPTCP_TCPINFO: |
| 1468 | return mptcp_getsockopt_tcpinfo(msk, optval, optlen); |
| 1469 | case MPTCP_SUBFLOW_ADDRS: |
| 1470 | return mptcp_getsockopt_subflow_addrs(msk, optval, optlen); |
| 1471 | } |
| 1472 | |
| 1473 | return -EOPNOTSUPP; |
| 1474 | } |
| 1475 | |
| 1476 | int mptcp_getsockopt(struct sock *sk, int level, int optname, |
| 1477 | char __user *optval, int __user *option) |
| 1478 | { |
| 1479 | struct mptcp_sock *msk = mptcp_sk(sk); |
| 1480 | struct sock *ssk; |
| 1481 | |
| 1482 | pr_debug("msk=%p\n", msk); |
| 1483 | |
| 1484 | /* @@ the meaning of setsockopt() when the socket is connected and |
| 1485 | * there are multiple subflows is not yet defined. It is up to the |
| 1486 | * MPTCP-level socket to configure the subflows until the subflow |
| 1487 | * is in TCP fallback, when socket options are passed through |
| 1488 | * to the one remaining subflow. |
| 1489 | */ |
| 1490 | lock_sock(sk); |
| 1491 | ssk = __mptcp_tcp_fallback(msk); |
| 1492 | release_sock(sk); |
| 1493 | if (ssk) |
| 1494 | return tcp_getsockopt(ssk, level, optname, optval, option); |
| 1495 | |
| 1496 | if (level == SOL_IP) |
| 1497 | return mptcp_getsockopt_v4(msk, optname, optval, option); |
| 1498 | if (level == SOL_IPV6) |
| 1499 | return mptcp_getsockopt_v6(msk, optname, optval, option); |
| 1500 | if (level == SOL_TCP) |
| 1501 | return mptcp_getsockopt_sol_tcp(msk, optname, optval, option); |
| 1502 | if (level == SOL_MPTCP) |
| 1503 | return mptcp_getsockopt_sol_mptcp(msk, optname, optval, option); |
| 1504 | return -EOPNOTSUPP; |
| 1505 | } |
| 1506 | |
| 1507 | static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk) |
| 1508 | { |
| 1509 | static const unsigned int tx_rx_locks = SOCK_RCVBUF_LOCK | SOCK_SNDBUF_LOCK; |
| 1510 | struct sock *sk = (struct sock *)msk; |
| 1511 | |
| 1512 | if (ssk->sk_prot->keepalive) { |
| 1513 | if (sock_flag(sk, SOCK_KEEPOPEN)) |
| 1514 | ssk->sk_prot->keepalive(ssk, 1); |
| 1515 | else |
| 1516 | ssk->sk_prot->keepalive(ssk, 0); |
| 1517 | } |
| 1518 | |
| 1519 | ssk->sk_priority = sk->sk_priority; |
| 1520 | ssk->sk_bound_dev_if = sk->sk_bound_dev_if; |
| 1521 | ssk->sk_incoming_cpu = sk->sk_incoming_cpu; |
| 1522 | ssk->sk_ipv6only = sk->sk_ipv6only; |
| 1523 | __ip_sock_set_tos(ssk, inet_sk(sk)->tos); |
| 1524 | |
| 1525 | if (sk->sk_userlocks & tx_rx_locks) { |
| 1526 | ssk->sk_userlocks |= sk->sk_userlocks & tx_rx_locks; |
| 1527 | if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) { |
| 1528 | WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); |
| 1529 | mptcp_subflow_ctx(ssk)->cached_sndbuf = sk->sk_sndbuf; |
| 1530 | } |
| 1531 | if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) |
| 1532 | WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); |
| 1533 | } |
| 1534 | |
| 1535 | if (sock_flag(sk, SOCK_LINGER)) { |
| 1536 | ssk->sk_lingertime = sk->sk_lingertime; |
| 1537 | sock_set_flag(ssk, SOCK_LINGER); |
| 1538 | } else { |
| 1539 | sock_reset_flag(ssk, SOCK_LINGER); |
| 1540 | } |
| 1541 | |
| 1542 | if (sk->sk_mark != ssk->sk_mark) { |
| 1543 | ssk->sk_mark = sk->sk_mark; |
| 1544 | sk_dst_reset(ssk); |
| 1545 | } |
| 1546 | |
| 1547 | sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG)); |
| 1548 | |
| 1549 | if (inet_csk(sk)->icsk_ca_ops != inet_csk(ssk)->icsk_ca_ops) |
| 1550 | tcp_set_congestion_control(ssk, msk->ca_name, false, true); |
| 1551 | __tcp_sock_set_cork(ssk, !!msk->cork); |
| 1552 | __tcp_sock_set_nodelay(ssk, !!msk->nodelay); |
| 1553 | tcp_sock_set_keepidle_locked(ssk, msk->keepalive_idle); |
| 1554 | tcp_sock_set_keepintvl(ssk, msk->keepalive_intvl); |
| 1555 | tcp_sock_set_keepcnt(ssk, msk->keepalive_cnt); |
| 1556 | |
| 1557 | inet_assign_bit(TRANSPARENT, ssk, inet_test_bit(TRANSPARENT, sk)); |
| 1558 | inet_assign_bit(FREEBIND, ssk, inet_test_bit(FREEBIND, sk)); |
| 1559 | inet_assign_bit(BIND_ADDRESS_NO_PORT, ssk, inet_test_bit(BIND_ADDRESS_NO_PORT, sk)); |
| 1560 | WRITE_ONCE(inet_sk(ssk)->local_port_range, READ_ONCE(inet_sk(sk)->local_port_range)); |
| 1561 | } |
| 1562 | |
| 1563 | void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk) |
| 1564 | { |
| 1565 | struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
| 1566 | |
| 1567 | msk_owned_by_me(msk); |
| 1568 | |
| 1569 | ssk->sk_rcvlowat = 0; |
| 1570 | |
| 1571 | /* subflows must ignore any latency-related settings: will not affect |
| 1572 | * the user-space - only the msk is relevant - but will foul the |
| 1573 | * mptcp scheduler |
| 1574 | */ |
| 1575 | tcp_sk(ssk)->notsent_lowat = UINT_MAX; |
| 1576 | |
| 1577 | if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { |
| 1578 | sync_socket_options(msk, ssk); |
| 1579 | |
| 1580 | subflow->setsockopt_seq = msk->setsockopt_seq; |
| 1581 | } |
| 1582 | } |
| 1583 | |
| 1584 | /* unfortunately this is different enough from the tcp version so |
| 1585 | * that we can't factor it out |
| 1586 | */ |
| 1587 | int mptcp_set_rcvlowat(struct sock *sk, int val) |
| 1588 | { |
| 1589 | struct mptcp_subflow_context *subflow; |
| 1590 | int space, cap; |
| 1591 | |
| 1592 | /* bpf can land here with a wrong sk type */ |
| 1593 | if (sk->sk_protocol == IPPROTO_TCP) |
| 1594 | return -EINVAL; |
| 1595 | |
| 1596 | if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) |
| 1597 | cap = sk->sk_rcvbuf >> 1; |
| 1598 | else |
| 1599 | cap = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_rmem[2]) >> 1; |
| 1600 | val = min(val, cap); |
| 1601 | WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); |
| 1602 | |
| 1603 | /* Check if we need to signal EPOLLIN right now */ |
| 1604 | if (mptcp_epollin_ready(sk)) |
| 1605 | sk->sk_data_ready(sk); |
| 1606 | |
| 1607 | if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) |
| 1608 | return 0; |
| 1609 | |
| 1610 | space = mptcp_space_from_win(sk, val); |
| 1611 | if (space <= sk->sk_rcvbuf) |
| 1612 | return 0; |
| 1613 | |
| 1614 | /* propagate the rcvbuf changes to all the subflows */ |
| 1615 | WRITE_ONCE(sk->sk_rcvbuf, space); |
| 1616 | mptcp_for_each_subflow(mptcp_sk(sk), subflow) { |
| 1617 | struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| 1618 | bool slow; |
| 1619 | |
| 1620 | slow = lock_sock_fast(ssk); |
| 1621 | WRITE_ONCE(ssk->sk_rcvbuf, space); |
| 1622 | WRITE_ONCE(tcp_sk(ssk)->window_clamp, val); |
| 1623 | unlock_sock_fast(ssk, slow); |
| 1624 | } |
| 1625 | return 0; |
| 1626 | } |