10abdde82SPaolo Abeni // SPDX-License-Identifier: GPL-2.0 20abdde82SPaolo Abeni /* Multipath TCP 30abdde82SPaolo Abeni * 40abdde82SPaolo Abeni * Copyright (c) 2021, Red Hat. 50abdde82SPaolo Abeni */ 60abdde82SPaolo Abeni 70abdde82SPaolo Abeni #define pr_fmt(fmt) "MPTCP: " fmt 80abdde82SPaolo Abeni 90abdde82SPaolo Abeni #include <linux/kernel.h> 100abdde82SPaolo Abeni #include <linux/module.h> 110abdde82SPaolo Abeni #include <net/sock.h> 120abdde82SPaolo Abeni #include <net/protocol.h> 130abdde82SPaolo Abeni #include <net/tcp.h> 140abdde82SPaolo Abeni #include <net/mptcp.h> 150abdde82SPaolo Abeni #include "protocol.h" 160abdde82SPaolo Abeni 1706f15ceeSFlorian Westphal #define MIN_INFO_OPTLEN_SIZE 16 1806f15ceeSFlorian Westphal 190abdde82SPaolo Abeni static struct sock *__mptcp_tcp_fallback(struct mptcp_sock *msk) 200abdde82SPaolo Abeni { 210abdde82SPaolo Abeni sock_owned_by_me((const struct sock *)msk); 220abdde82SPaolo Abeni 230abdde82SPaolo Abeni if (likely(!__mptcp_check_fallback(msk))) 240abdde82SPaolo Abeni return NULL; 250abdde82SPaolo Abeni 260abdde82SPaolo Abeni return msk->first; 270abdde82SPaolo Abeni } 280abdde82SPaolo Abeni 29df00b087SFlorian Westphal static u32 sockopt_seq_reset(const struct sock *sk) 30df00b087SFlorian Westphal { 31df00b087SFlorian Westphal sock_owned_by_me(sk); 32df00b087SFlorian Westphal 33df00b087SFlorian Westphal /* Highbits contain state. Allows to distinguish sockopt_seq 34df00b087SFlorian Westphal * of listener and established: 35df00b087SFlorian Westphal * s0 = new_listener() 36df00b087SFlorian Westphal * sockopt(s0) - seq is 1 37df00b087SFlorian Westphal * s1 = accept(s0) - s1 inherits seq 1 if listener sk (s0) 38df00b087SFlorian Westphal * sockopt(s0) - seq increments to 2 on s0 39df00b087SFlorian Westphal * sockopt(s1) // seq increments to 2 on s1 (different option) 40df00b087SFlorian Westphal * new ssk completes join, inherits options from s0 // seq 2 41df00b087SFlorian Westphal * Needs sync from mptcp join logic, but ssk->seq == msk->seq 42df00b087SFlorian Westphal * 43df00b087SFlorian Westphal * Set High order bits to sk_state so ssk->seq == msk->seq test 44df00b087SFlorian Westphal * will fail. 45df00b087SFlorian Westphal */ 46df00b087SFlorian Westphal 47df00b087SFlorian Westphal return (u32)sk->sk_state << 24u; 48df00b087SFlorian Westphal } 49df00b087SFlorian Westphal 501b3e7edeSFlorian Westphal static void sockopt_seq_inc(struct mptcp_sock *msk) 511b3e7edeSFlorian Westphal { 521b3e7edeSFlorian Westphal u32 seq = (msk->setsockopt_seq + 1) & 0x00ffffff; 531b3e7edeSFlorian Westphal 541b3e7edeSFlorian Westphal msk->setsockopt_seq = sockopt_seq_reset((struct sock *)msk) + seq; 551b3e7edeSFlorian Westphal } 561b3e7edeSFlorian Westphal 571b3e7edeSFlorian Westphal static int mptcp_get_int_option(struct mptcp_sock *msk, sockptr_t optval, 581b3e7edeSFlorian Westphal unsigned int optlen, int *val) 591b3e7edeSFlorian Westphal { 601b3e7edeSFlorian Westphal if (optlen < sizeof(int)) 611b3e7edeSFlorian Westphal return -EINVAL; 621b3e7edeSFlorian Westphal 631b3e7edeSFlorian Westphal if (copy_from_sockptr(val, optval, sizeof(*val))) 641b3e7edeSFlorian Westphal return -EFAULT; 651b3e7edeSFlorian Westphal 661b3e7edeSFlorian Westphal return 0; 671b3e7edeSFlorian Westphal } 681b3e7edeSFlorian Westphal 691b3e7edeSFlorian Westphal static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, int val) 701b3e7edeSFlorian Westphal { 711b3e7edeSFlorian Westphal struct mptcp_subflow_context *subflow; 721b3e7edeSFlorian Westphal struct sock *sk = (struct sock *)msk; 731b3e7edeSFlorian Westphal 741b3e7edeSFlorian Westphal lock_sock(sk); 751b3e7edeSFlorian Westphal sockopt_seq_inc(msk); 761b3e7edeSFlorian Westphal 771b3e7edeSFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 781b3e7edeSFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 791b3e7edeSFlorian Westphal bool slow = lock_sock_fast(ssk); 801b3e7edeSFlorian Westphal 811b3e7edeSFlorian Westphal switch (optname) { 82a03c99b2SFlorian Westphal case SO_DEBUG: 83a03c99b2SFlorian Westphal sock_valbool_flag(ssk, SOCK_DBG, !!val); 84a03c99b2SFlorian Westphal break; 851b3e7edeSFlorian Westphal case SO_KEEPALIVE: 861b3e7edeSFlorian Westphal if (ssk->sk_prot->keepalive) 871b3e7edeSFlorian Westphal ssk->sk_prot->keepalive(ssk, !!val); 881b3e7edeSFlorian Westphal sock_valbool_flag(ssk, SOCK_KEEPOPEN, !!val); 891b3e7edeSFlorian Westphal break; 901b3e7edeSFlorian Westphal case SO_PRIORITY: 911b3e7edeSFlorian Westphal ssk->sk_priority = val; 921b3e7edeSFlorian Westphal break; 935d0a6bc8SFlorian Westphal case SO_SNDBUF: 945d0a6bc8SFlorian Westphal case SO_SNDBUFFORCE: 955d0a6bc8SFlorian Westphal ssk->sk_userlocks |= SOCK_SNDBUF_LOCK; 965d0a6bc8SFlorian Westphal WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); 975d0a6bc8SFlorian Westphal break; 985d0a6bc8SFlorian Westphal case SO_RCVBUF: 995d0a6bc8SFlorian Westphal case SO_RCVBUFFORCE: 1005d0a6bc8SFlorian Westphal ssk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1015d0a6bc8SFlorian Westphal WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); 1025d0a6bc8SFlorian Westphal break; 10336704413SFlorian Westphal case SO_MARK: 10436704413SFlorian Westphal if (READ_ONCE(ssk->sk_mark) != sk->sk_mark) { 10536704413SFlorian Westphal ssk->sk_mark = sk->sk_mark; 10636704413SFlorian Westphal sk_dst_reset(ssk); 10736704413SFlorian Westphal } 10836704413SFlorian Westphal break; 1096f0d7198SFlorian Westphal case SO_INCOMING_CPU: 1106f0d7198SFlorian Westphal WRITE_ONCE(ssk->sk_incoming_cpu, val); 1116f0d7198SFlorian Westphal break; 1121b3e7edeSFlorian Westphal } 1131b3e7edeSFlorian Westphal 1141b3e7edeSFlorian Westphal subflow->setsockopt_seq = msk->setsockopt_seq; 1151b3e7edeSFlorian Westphal unlock_sock_fast(ssk, slow); 1161b3e7edeSFlorian Westphal } 1171b3e7edeSFlorian Westphal 1181b3e7edeSFlorian Westphal release_sock(sk); 1191b3e7edeSFlorian Westphal } 1201b3e7edeSFlorian Westphal 1211b3e7edeSFlorian Westphal static int mptcp_sol_socket_intval(struct mptcp_sock *msk, int optname, int val) 1221b3e7edeSFlorian Westphal { 1231b3e7edeSFlorian Westphal sockptr_t optval = KERNEL_SOCKPTR(&val); 1241b3e7edeSFlorian Westphal struct sock *sk = (struct sock *)msk; 1251b3e7edeSFlorian Westphal int ret; 1261b3e7edeSFlorian Westphal 1271b3e7edeSFlorian Westphal ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 1281b3e7edeSFlorian Westphal optval, sizeof(val)); 1291b3e7edeSFlorian Westphal if (ret) 1301b3e7edeSFlorian Westphal return ret; 1311b3e7edeSFlorian Westphal 1321b3e7edeSFlorian Westphal mptcp_sol_socket_sync_intval(msk, optname, val); 1331b3e7edeSFlorian Westphal return 0; 1341b3e7edeSFlorian Westphal } 1351b3e7edeSFlorian Westphal 1366f0d7198SFlorian Westphal static void mptcp_so_incoming_cpu(struct mptcp_sock *msk, int val) 1376f0d7198SFlorian Westphal { 1386f0d7198SFlorian Westphal struct sock *sk = (struct sock *)msk; 1396f0d7198SFlorian Westphal 1406f0d7198SFlorian Westphal WRITE_ONCE(sk->sk_incoming_cpu, val); 1416f0d7198SFlorian Westphal 1426f0d7198SFlorian Westphal mptcp_sol_socket_sync_intval(msk, SO_INCOMING_CPU, val); 1436f0d7198SFlorian Westphal } 1446f0d7198SFlorian Westphal 1459061f24bSFlorian Westphal static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optname, int val) 1469061f24bSFlorian Westphal { 1479061f24bSFlorian Westphal sockptr_t optval = KERNEL_SOCKPTR(&val); 1489061f24bSFlorian Westphal struct mptcp_subflow_context *subflow; 1499061f24bSFlorian Westphal struct sock *sk = (struct sock *)msk; 1509061f24bSFlorian Westphal int ret; 1519061f24bSFlorian Westphal 1529061f24bSFlorian Westphal ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 1539061f24bSFlorian Westphal optval, sizeof(val)); 1549061f24bSFlorian Westphal if (ret) 1559061f24bSFlorian Westphal return ret; 1569061f24bSFlorian Westphal 1579061f24bSFlorian Westphal lock_sock(sk); 1589061f24bSFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 1599061f24bSFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1609061f24bSFlorian Westphal bool slow = lock_sock_fast(ssk); 1619061f24bSFlorian Westphal 1629061f24bSFlorian Westphal sock_set_timestamp(sk, optname, !!val); 1639061f24bSFlorian Westphal unlock_sock_fast(ssk, slow); 1649061f24bSFlorian Westphal } 1659061f24bSFlorian Westphal 1669061f24bSFlorian Westphal release_sock(sk); 1679061f24bSFlorian Westphal return 0; 1689061f24bSFlorian Westphal } 1699061f24bSFlorian Westphal 1701b3e7edeSFlorian Westphal static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname, 1716c9a0a0fSYangbo Lu sockptr_t optval, 1726c9a0a0fSYangbo Lu unsigned int optlen) 1731b3e7edeSFlorian Westphal { 1741b3e7edeSFlorian Westphal int val, ret; 1751b3e7edeSFlorian Westphal 1761b3e7edeSFlorian Westphal ret = mptcp_get_int_option(msk, optval, optlen, &val); 1771b3e7edeSFlorian Westphal if (ret) 1781b3e7edeSFlorian Westphal return ret; 1791b3e7edeSFlorian Westphal 1801b3e7edeSFlorian Westphal switch (optname) { 1811b3e7edeSFlorian Westphal case SO_KEEPALIVE: 1821b3e7edeSFlorian Westphal mptcp_sol_socket_sync_intval(msk, optname, val); 1831b3e7edeSFlorian Westphal return 0; 184a03c99b2SFlorian Westphal case SO_DEBUG: 18536704413SFlorian Westphal case SO_MARK: 1861b3e7edeSFlorian Westphal case SO_PRIORITY: 1875d0a6bc8SFlorian Westphal case SO_SNDBUF: 1885d0a6bc8SFlorian Westphal case SO_SNDBUFFORCE: 1895d0a6bc8SFlorian Westphal case SO_RCVBUF: 1905d0a6bc8SFlorian Westphal case SO_RCVBUFFORCE: 1911b3e7edeSFlorian Westphal return mptcp_sol_socket_intval(msk, optname, val); 1926f0d7198SFlorian Westphal case SO_INCOMING_CPU: 1936f0d7198SFlorian Westphal mptcp_so_incoming_cpu(msk, val); 1946f0d7198SFlorian Westphal return 0; 1959061f24bSFlorian Westphal case SO_TIMESTAMP_OLD: 1969061f24bSFlorian Westphal case SO_TIMESTAMP_NEW: 1979061f24bSFlorian Westphal case SO_TIMESTAMPNS_OLD: 1989061f24bSFlorian Westphal case SO_TIMESTAMPNS_NEW: 1999061f24bSFlorian Westphal return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val); 2001b3e7edeSFlorian Westphal } 2011b3e7edeSFlorian Westphal 2021b3e7edeSFlorian Westphal return -ENOPROTOOPT; 2031b3e7edeSFlorian Westphal } 2041b3e7edeSFlorian Westphal 2056c9a0a0fSYangbo Lu static int mptcp_setsockopt_sol_socket_timestamping(struct mptcp_sock *msk, 2066c9a0a0fSYangbo Lu int optname, 2076c9a0a0fSYangbo Lu sockptr_t optval, 2086c9a0a0fSYangbo Lu unsigned int optlen) 2096c9a0a0fSYangbo Lu { 2106c9a0a0fSYangbo Lu struct mptcp_subflow_context *subflow; 2116c9a0a0fSYangbo Lu struct sock *sk = (struct sock *)msk; 212d463126eSYangbo Lu struct so_timestamping timestamping; 213d463126eSYangbo Lu int ret; 2146c9a0a0fSYangbo Lu 215d463126eSYangbo Lu if (optlen == sizeof(timestamping)) { 216d463126eSYangbo Lu if (copy_from_sockptr(×tamping, optval, 217d463126eSYangbo Lu sizeof(timestamping))) 218d463126eSYangbo Lu return -EFAULT; 219d463126eSYangbo Lu } else if (optlen == sizeof(int)) { 220d463126eSYangbo Lu memset(×tamping, 0, sizeof(timestamping)); 221d463126eSYangbo Lu 222d463126eSYangbo Lu if (copy_from_sockptr(×tamping.flags, optval, sizeof(int))) 223d463126eSYangbo Lu return -EFAULT; 224d463126eSYangbo Lu } else { 225d463126eSYangbo Lu return -EINVAL; 226d463126eSYangbo Lu } 2276c9a0a0fSYangbo Lu 2286c9a0a0fSYangbo Lu ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 229d463126eSYangbo Lu KERNEL_SOCKPTR(×tamping), 230d463126eSYangbo Lu sizeof(timestamping)); 2316c9a0a0fSYangbo Lu if (ret) 2326c9a0a0fSYangbo Lu return ret; 2336c9a0a0fSYangbo Lu 2346c9a0a0fSYangbo Lu lock_sock(sk); 2356c9a0a0fSYangbo Lu 2366c9a0a0fSYangbo Lu mptcp_for_each_subflow(msk, subflow) { 2376c9a0a0fSYangbo Lu struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 2386c9a0a0fSYangbo Lu bool slow = lock_sock_fast(ssk); 2396c9a0a0fSYangbo Lu 240d463126eSYangbo Lu sock_set_timestamping(sk, optname, timestamping); 2416c9a0a0fSYangbo Lu unlock_sock_fast(ssk, slow); 2426c9a0a0fSYangbo Lu } 2436c9a0a0fSYangbo Lu 2446c9a0a0fSYangbo Lu release_sock(sk); 2456c9a0a0fSYangbo Lu 2466c9a0a0fSYangbo Lu return 0; 2476c9a0a0fSYangbo Lu } 2486c9a0a0fSYangbo Lu 249268b1238SFlorian Westphal static int mptcp_setsockopt_sol_socket_linger(struct mptcp_sock *msk, sockptr_t optval, 250268b1238SFlorian Westphal unsigned int optlen) 251268b1238SFlorian Westphal { 252268b1238SFlorian Westphal struct mptcp_subflow_context *subflow; 253268b1238SFlorian Westphal struct sock *sk = (struct sock *)msk; 254268b1238SFlorian Westphal struct linger ling; 255268b1238SFlorian Westphal sockptr_t kopt; 256268b1238SFlorian Westphal int ret; 257268b1238SFlorian Westphal 258268b1238SFlorian Westphal if (optlen < sizeof(ling)) 259268b1238SFlorian Westphal return -EINVAL; 260268b1238SFlorian Westphal 261268b1238SFlorian Westphal if (copy_from_sockptr(&ling, optval, sizeof(ling))) 262268b1238SFlorian Westphal return -EFAULT; 263268b1238SFlorian Westphal 264268b1238SFlorian Westphal kopt = KERNEL_SOCKPTR(&ling); 265268b1238SFlorian Westphal ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, SO_LINGER, kopt, sizeof(ling)); 266268b1238SFlorian Westphal if (ret) 267268b1238SFlorian Westphal return ret; 268268b1238SFlorian Westphal 269268b1238SFlorian Westphal lock_sock(sk); 270268b1238SFlorian Westphal sockopt_seq_inc(msk); 271268b1238SFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 272268b1238SFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 273268b1238SFlorian Westphal bool slow = lock_sock_fast(ssk); 274268b1238SFlorian Westphal 275268b1238SFlorian Westphal if (!ling.l_onoff) { 276268b1238SFlorian Westphal sock_reset_flag(ssk, SOCK_LINGER); 277268b1238SFlorian Westphal } else { 278268b1238SFlorian Westphal ssk->sk_lingertime = sk->sk_lingertime; 279268b1238SFlorian Westphal sock_set_flag(ssk, SOCK_LINGER); 280268b1238SFlorian Westphal } 281268b1238SFlorian Westphal 282268b1238SFlorian Westphal subflow->setsockopt_seq = msk->setsockopt_seq; 283268b1238SFlorian Westphal unlock_sock_fast(ssk, slow); 284268b1238SFlorian Westphal } 285268b1238SFlorian Westphal 286268b1238SFlorian Westphal release_sock(sk); 287268b1238SFlorian Westphal return 0; 288268b1238SFlorian Westphal } 289268b1238SFlorian Westphal 2900abdde82SPaolo Abeni static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname, 2910abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen) 2920abdde82SPaolo Abeni { 2930abdde82SPaolo Abeni struct sock *sk = (struct sock *)msk; 2940abdde82SPaolo Abeni struct socket *ssock; 2950abdde82SPaolo Abeni int ret; 2960abdde82SPaolo Abeni 2970abdde82SPaolo Abeni switch (optname) { 2980abdde82SPaolo Abeni case SO_REUSEPORT: 2990abdde82SPaolo Abeni case SO_REUSEADDR: 3005d0a6bc8SFlorian Westphal case SO_BINDTODEVICE: 3015d0a6bc8SFlorian Westphal case SO_BINDTOIFINDEX: 3020abdde82SPaolo Abeni lock_sock(sk); 3030abdde82SPaolo Abeni ssock = __mptcp_nmpc_socket(msk); 3040abdde82SPaolo Abeni if (!ssock) { 3050abdde82SPaolo Abeni release_sock(sk); 3060abdde82SPaolo Abeni return -EINVAL; 3070abdde82SPaolo Abeni } 3080abdde82SPaolo Abeni 3090abdde82SPaolo Abeni ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen); 3100abdde82SPaolo Abeni if (ret == 0) { 3110abdde82SPaolo Abeni if (optname == SO_REUSEPORT) 3120abdde82SPaolo Abeni sk->sk_reuseport = ssock->sk->sk_reuseport; 3130abdde82SPaolo Abeni else if (optname == SO_REUSEADDR) 3140abdde82SPaolo Abeni sk->sk_reuse = ssock->sk->sk_reuse; 3155d0a6bc8SFlorian Westphal else if (optname == SO_BINDTODEVICE) 3165d0a6bc8SFlorian Westphal sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if; 3175d0a6bc8SFlorian Westphal else if (optname == SO_BINDTOIFINDEX) 3185d0a6bc8SFlorian Westphal sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if; 3190abdde82SPaolo Abeni } 3200abdde82SPaolo Abeni release_sock(sk); 3210abdde82SPaolo Abeni return ret; 3221b3e7edeSFlorian Westphal case SO_KEEPALIVE: 3231b3e7edeSFlorian Westphal case SO_PRIORITY: 3245d0a6bc8SFlorian Westphal case SO_SNDBUF: 3255d0a6bc8SFlorian Westphal case SO_SNDBUFFORCE: 3265d0a6bc8SFlorian Westphal case SO_RCVBUF: 3275d0a6bc8SFlorian Westphal case SO_RCVBUFFORCE: 32836704413SFlorian Westphal case SO_MARK: 3296f0d7198SFlorian Westphal case SO_INCOMING_CPU: 330a03c99b2SFlorian Westphal case SO_DEBUG: 3319061f24bSFlorian Westphal case SO_TIMESTAMP_OLD: 3329061f24bSFlorian Westphal case SO_TIMESTAMP_NEW: 3339061f24bSFlorian Westphal case SO_TIMESTAMPNS_OLD: 3349061f24bSFlorian Westphal case SO_TIMESTAMPNS_NEW: 3356c9a0a0fSYangbo Lu return mptcp_setsockopt_sol_socket_int(msk, optname, optval, 3366c9a0a0fSYangbo Lu optlen); 3379061f24bSFlorian Westphal case SO_TIMESTAMPING_OLD: 3389061f24bSFlorian Westphal case SO_TIMESTAMPING_NEW: 3396c9a0a0fSYangbo Lu return mptcp_setsockopt_sol_socket_timestamping(msk, optname, 3406c9a0a0fSYangbo Lu optval, optlen); 341268b1238SFlorian Westphal case SO_LINGER: 342268b1238SFlorian Westphal return mptcp_setsockopt_sol_socket_linger(msk, optval, optlen); 3437a009a70SFlorian Westphal case SO_RCVLOWAT: 3447a009a70SFlorian Westphal case SO_RCVTIMEO_OLD: 3457a009a70SFlorian Westphal case SO_RCVTIMEO_NEW: 3467a009a70SFlorian Westphal case SO_BUSY_POLL: 3477a009a70SFlorian Westphal case SO_PREFER_BUSY_POLL: 3487a009a70SFlorian Westphal case SO_BUSY_POLL_BUDGET: 3497a009a70SFlorian Westphal /* No need to copy: only relevant for msk */ 3507a009a70SFlorian Westphal return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen); 351a03c99b2SFlorian Westphal case SO_NO_CHECK: 352a03c99b2SFlorian Westphal case SO_DONTROUTE: 353a03c99b2SFlorian Westphal case SO_BROADCAST: 354a03c99b2SFlorian Westphal case SO_BSDCOMPAT: 355a03c99b2SFlorian Westphal case SO_PASSCRED: 356a03c99b2SFlorian Westphal case SO_PASSSEC: 357a03c99b2SFlorian Westphal case SO_RXQ_OVFL: 358a03c99b2SFlorian Westphal case SO_WIFI_STATUS: 359a03c99b2SFlorian Westphal case SO_NOFCS: 360a03c99b2SFlorian Westphal case SO_SELECT_ERR_QUEUE: 361a03c99b2SFlorian Westphal return 0; 3620abdde82SPaolo Abeni } 3630abdde82SPaolo Abeni 3647a009a70SFlorian Westphal /* SO_OOBINLINE is not supported, let's avoid the related mess 3657a009a70SFlorian Westphal * SO_ATTACH_FILTER, SO_ATTACH_BPF, SO_ATTACH_REUSEPORT_CBPF, 3667a009a70SFlorian Westphal * SO_DETACH_REUSEPORT_BPF, SO_DETACH_FILTER, SO_LOCK_FILTER, 3677a009a70SFlorian Westphal * we must be careful with subflows 3687a009a70SFlorian Westphal * 3697a009a70SFlorian Westphal * SO_ATTACH_REUSEPORT_EBPF is not supported, at it checks 3707a009a70SFlorian Westphal * explicitly the sk_protocol field 3717a009a70SFlorian Westphal * 3727a009a70SFlorian Westphal * SO_PEEK_OFF is unsupported, as it is for plain TCP 3737a009a70SFlorian Westphal * SO_MAX_PACING_RATE is unsupported, we must be careful with subflows 3747a009a70SFlorian Westphal * SO_CNX_ADVICE is currently unsupported, could possibly be relevant, 3757a009a70SFlorian Westphal * but likely needs careful design 3767a009a70SFlorian Westphal * 3777a009a70SFlorian Westphal * SO_ZEROCOPY is currently unsupported, TODO in sndmsg 3787a009a70SFlorian Westphal * SO_TXTIME is currently unsupported 3797a009a70SFlorian Westphal */ 3807a009a70SFlorian Westphal 3817a009a70SFlorian Westphal return -EOPNOTSUPP; 3820abdde82SPaolo Abeni } 3830abdde82SPaolo Abeni 3840abdde82SPaolo Abeni static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname, 3850abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen) 3860abdde82SPaolo Abeni { 3870abdde82SPaolo Abeni struct sock *sk = (struct sock *)msk; 3880abdde82SPaolo Abeni int ret = -EOPNOTSUPP; 3890abdde82SPaolo Abeni struct socket *ssock; 3900abdde82SPaolo Abeni 3910abdde82SPaolo Abeni switch (optname) { 3920abdde82SPaolo Abeni case IPV6_V6ONLY: 3930abdde82SPaolo Abeni lock_sock(sk); 3940abdde82SPaolo Abeni ssock = __mptcp_nmpc_socket(msk); 3950abdde82SPaolo Abeni if (!ssock) { 3960abdde82SPaolo Abeni release_sock(sk); 3970abdde82SPaolo Abeni return -EINVAL; 3980abdde82SPaolo Abeni } 3990abdde82SPaolo Abeni 4000abdde82SPaolo Abeni ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen); 4010abdde82SPaolo Abeni if (ret == 0) 4020abdde82SPaolo Abeni sk->sk_ipv6only = ssock->sk->sk_ipv6only; 4030abdde82SPaolo Abeni 4040abdde82SPaolo Abeni release_sock(sk); 4050abdde82SPaolo Abeni break; 4060abdde82SPaolo Abeni } 4070abdde82SPaolo Abeni 4080abdde82SPaolo Abeni return ret; 4090abdde82SPaolo Abeni } 4100abdde82SPaolo Abeni 411d9e4c129SPaolo Abeni static bool mptcp_supported_sockopt(int level, int optname) 412d9e4c129SPaolo Abeni { 413d9e4c129SPaolo Abeni if (level == SOL_IP) { 414d9e4c129SPaolo Abeni switch (optname) { 415d9e4c129SPaolo Abeni /* should work fine */ 416d9e4c129SPaolo Abeni case IP_FREEBIND: 417d9e4c129SPaolo Abeni case IP_TRANSPARENT: 418d9e4c129SPaolo Abeni 419d9e4c129SPaolo Abeni /* the following are control cmsg related */ 420d9e4c129SPaolo Abeni case IP_PKTINFO: 421d9e4c129SPaolo Abeni case IP_RECVTTL: 422d9e4c129SPaolo Abeni case IP_RECVTOS: 423d9e4c129SPaolo Abeni case IP_RECVOPTS: 424d9e4c129SPaolo Abeni case IP_RETOPTS: 425d9e4c129SPaolo Abeni case IP_PASSSEC: 426d9e4c129SPaolo Abeni case IP_RECVORIGDSTADDR: 427d9e4c129SPaolo Abeni case IP_CHECKSUM: 428d9e4c129SPaolo Abeni case IP_RECVFRAGSIZE: 429d9e4c129SPaolo Abeni 430d9e4c129SPaolo Abeni /* common stuff that need some love */ 431d9e4c129SPaolo Abeni case IP_TOS: 432d9e4c129SPaolo Abeni case IP_TTL: 433d9e4c129SPaolo Abeni case IP_BIND_ADDRESS_NO_PORT: 434d9e4c129SPaolo Abeni case IP_MTU_DISCOVER: 435d9e4c129SPaolo Abeni case IP_RECVERR: 436d9e4c129SPaolo Abeni 437d9e4c129SPaolo Abeni /* possibly less common may deserve some love */ 438d9e4c129SPaolo Abeni case IP_MINTTL: 439d9e4c129SPaolo Abeni 440d9e4c129SPaolo Abeni /* the following is apparently a no-op for plain TCP */ 441d9e4c129SPaolo Abeni case IP_RECVERR_RFC4884: 442d9e4c129SPaolo Abeni return true; 443d9e4c129SPaolo Abeni } 444d9e4c129SPaolo Abeni 445d9e4c129SPaolo Abeni /* IP_OPTIONS is not supported, needs subflow care */ 446d9e4c129SPaolo Abeni /* IP_HDRINCL, IP_NODEFRAG are not supported, RAW specific */ 447d9e4c129SPaolo Abeni /* IP_MULTICAST_TTL, IP_MULTICAST_LOOP, IP_UNICAST_IF, 448d9e4c129SPaolo Abeni * IP_ADD_MEMBERSHIP, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP, 449d9e4c129SPaolo Abeni * IP_DROP_SOURCE_MEMBERSHIP, IP_BLOCK_SOURCE, IP_UNBLOCK_SOURCE, 450d9e4c129SPaolo Abeni * MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP MCAST_JOIN_SOURCE_GROUP, 451d9e4c129SPaolo Abeni * MCAST_LEAVE_SOURCE_GROUP, MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, 452d9e4c129SPaolo Abeni * MCAST_MSFILTER, IP_MULTICAST_ALL are not supported, better not deal 453d9e4c129SPaolo Abeni * with mcast stuff 454d9e4c129SPaolo Abeni */ 455d9e4c129SPaolo Abeni /* IP_IPSEC_POLICY, IP_XFRM_POLICY are nut supported, unrelated here */ 456d9e4c129SPaolo Abeni return false; 457d9e4c129SPaolo Abeni } 458d9e4c129SPaolo Abeni if (level == SOL_IPV6) { 459d9e4c129SPaolo Abeni switch (optname) { 460d9e4c129SPaolo Abeni case IPV6_V6ONLY: 461d9e4c129SPaolo Abeni 462d9e4c129SPaolo Abeni /* the following are control cmsg related */ 463d9e4c129SPaolo Abeni case IPV6_RECVPKTINFO: 464d9e4c129SPaolo Abeni case IPV6_2292PKTINFO: 465d9e4c129SPaolo Abeni case IPV6_RECVHOPLIMIT: 466d9e4c129SPaolo Abeni case IPV6_2292HOPLIMIT: 467d9e4c129SPaolo Abeni case IPV6_RECVRTHDR: 468d9e4c129SPaolo Abeni case IPV6_2292RTHDR: 469d9e4c129SPaolo Abeni case IPV6_RECVHOPOPTS: 470d9e4c129SPaolo Abeni case IPV6_2292HOPOPTS: 471d9e4c129SPaolo Abeni case IPV6_RECVDSTOPTS: 472d9e4c129SPaolo Abeni case IPV6_2292DSTOPTS: 473d9e4c129SPaolo Abeni case IPV6_RECVTCLASS: 474d9e4c129SPaolo Abeni case IPV6_FLOWINFO: 475d9e4c129SPaolo Abeni case IPV6_RECVPATHMTU: 476d9e4c129SPaolo Abeni case IPV6_RECVORIGDSTADDR: 477d9e4c129SPaolo Abeni case IPV6_RECVFRAGSIZE: 478d9e4c129SPaolo Abeni 479d9e4c129SPaolo Abeni /* the following ones need some love but are quite common */ 480d9e4c129SPaolo Abeni case IPV6_TCLASS: 481d9e4c129SPaolo Abeni case IPV6_TRANSPARENT: 482d9e4c129SPaolo Abeni case IPV6_FREEBIND: 483d9e4c129SPaolo Abeni case IPV6_PKTINFO: 484d9e4c129SPaolo Abeni case IPV6_2292PKTOPTIONS: 485d9e4c129SPaolo Abeni case IPV6_UNICAST_HOPS: 486d9e4c129SPaolo Abeni case IPV6_MTU_DISCOVER: 487d9e4c129SPaolo Abeni case IPV6_MTU: 488d9e4c129SPaolo Abeni case IPV6_RECVERR: 489d9e4c129SPaolo Abeni case IPV6_FLOWINFO_SEND: 490d9e4c129SPaolo Abeni case IPV6_FLOWLABEL_MGR: 491d9e4c129SPaolo Abeni case IPV6_MINHOPCOUNT: 492d9e4c129SPaolo Abeni case IPV6_DONTFRAG: 493d9e4c129SPaolo Abeni case IPV6_AUTOFLOWLABEL: 494d9e4c129SPaolo Abeni 495d9e4c129SPaolo Abeni /* the following one is a no-op for plain TCP */ 496d9e4c129SPaolo Abeni case IPV6_RECVERR_RFC4884: 497d9e4c129SPaolo Abeni return true; 498d9e4c129SPaolo Abeni } 499d9e4c129SPaolo Abeni 500d9e4c129SPaolo Abeni /* IPV6_HOPOPTS, IPV6_RTHDRDSTOPTS, IPV6_RTHDR, IPV6_DSTOPTS are 501d9e4c129SPaolo Abeni * not supported 502d9e4c129SPaolo Abeni */ 503d9e4c129SPaolo Abeni /* IPV6_MULTICAST_HOPS, IPV6_MULTICAST_LOOP, IPV6_UNICAST_IF, 504d9e4c129SPaolo Abeni * IPV6_MULTICAST_IF, IPV6_ADDRFORM, 505d9e4c129SPaolo Abeni * IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST, 506d9e4c129SPaolo Abeni * IPV6_LEAVE_ANYCAST, IPV6_MULTICAST_ALL, MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP, 507d9e4c129SPaolo Abeni * MCAST_JOIN_SOURCE_GROUP, MCAST_LEAVE_SOURCE_GROUP, 508d9e4c129SPaolo Abeni * MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, MCAST_MSFILTER 509d9e4c129SPaolo Abeni * are not supported better not deal with mcast 510d9e4c129SPaolo Abeni */ 511d9e4c129SPaolo Abeni /* IPV6_ROUTER_ALERT, IPV6_ROUTER_ALERT_ISOLATE are not supported, since are evil */ 512d9e4c129SPaolo Abeni 513d9e4c129SPaolo Abeni /* IPV6_IPSEC_POLICY, IPV6_XFRM_POLICY are not supported */ 514d9e4c129SPaolo Abeni /* IPV6_ADDR_PREFERENCES is not supported, we must be careful with subflows */ 515d9e4c129SPaolo Abeni return false; 516d9e4c129SPaolo Abeni } 517d9e4c129SPaolo Abeni if (level == SOL_TCP) { 518d9e4c129SPaolo Abeni switch (optname) { 519d9e4c129SPaolo Abeni /* the following are no-op or should work just fine */ 520d9e4c129SPaolo Abeni case TCP_THIN_DUPACK: 521d9e4c129SPaolo Abeni case TCP_DEFER_ACCEPT: 522d9e4c129SPaolo Abeni 523d9e4c129SPaolo Abeni /* the following need some love */ 524d9e4c129SPaolo Abeni case TCP_MAXSEG: 525d9e4c129SPaolo Abeni case TCP_NODELAY: 526d9e4c129SPaolo Abeni case TCP_THIN_LINEAR_TIMEOUTS: 527d9e4c129SPaolo Abeni case TCP_CONGESTION: 528d9e4c129SPaolo Abeni case TCP_ULP: 529d9e4c129SPaolo Abeni case TCP_CORK: 530d9e4c129SPaolo Abeni case TCP_KEEPIDLE: 531d9e4c129SPaolo Abeni case TCP_KEEPINTVL: 532d9e4c129SPaolo Abeni case TCP_KEEPCNT: 533d9e4c129SPaolo Abeni case TCP_SYNCNT: 534d9e4c129SPaolo Abeni case TCP_SAVE_SYN: 535d9e4c129SPaolo Abeni case TCP_LINGER2: 536d9e4c129SPaolo Abeni case TCP_WINDOW_CLAMP: 537d9e4c129SPaolo Abeni case TCP_QUICKACK: 538d9e4c129SPaolo Abeni case TCP_USER_TIMEOUT: 539d9e4c129SPaolo Abeni case TCP_TIMESTAMP: 540d9e4c129SPaolo Abeni case TCP_NOTSENT_LOWAT: 541d9e4c129SPaolo Abeni case TCP_TX_DELAY: 542d9e4c129SPaolo Abeni return true; 543d9e4c129SPaolo Abeni } 544d9e4c129SPaolo Abeni 545d9e4c129SPaolo Abeni /* TCP_MD5SIG, TCP_MD5SIG_EXT are not supported, MD5 is not compatible with MPTCP */ 546d9e4c129SPaolo Abeni 547d9e4c129SPaolo Abeni /* TCP_REPAIR, TCP_REPAIR_QUEUE, TCP_QUEUE_SEQ, TCP_REPAIR_OPTIONS, 548d9e4c129SPaolo Abeni * TCP_REPAIR_WINDOW are not supported, better avoid this mess 549d9e4c129SPaolo Abeni */ 550d9e4c129SPaolo Abeni /* TCP_FASTOPEN_KEY, TCP_FASTOPEN TCP_FASTOPEN_CONNECT, TCP_FASTOPEN_NO_COOKIE, 551d9e4c129SPaolo Abeni * are not supported fastopen is currently unsupported 552d9e4c129SPaolo Abeni */ 553d9e4c129SPaolo Abeni /* TCP_INQ is currently unsupported, needs some recvmsg work */ 554d9e4c129SPaolo Abeni } 555d9e4c129SPaolo Abeni return false; 556d9e4c129SPaolo Abeni } 557d9e4c129SPaolo Abeni 558aa1fbd94SFlorian Westphal static int mptcp_setsockopt_sol_tcp_congestion(struct mptcp_sock *msk, sockptr_t optval, 559aa1fbd94SFlorian Westphal unsigned int optlen) 560aa1fbd94SFlorian Westphal { 561aa1fbd94SFlorian Westphal struct mptcp_subflow_context *subflow; 562aa1fbd94SFlorian Westphal struct sock *sk = (struct sock *)msk; 563aa1fbd94SFlorian Westphal char name[TCP_CA_NAME_MAX]; 564aa1fbd94SFlorian Westphal bool cap_net_admin; 565aa1fbd94SFlorian Westphal int ret; 566aa1fbd94SFlorian Westphal 567aa1fbd94SFlorian Westphal if (optlen < 1) 568aa1fbd94SFlorian Westphal return -EINVAL; 569aa1fbd94SFlorian Westphal 570aa1fbd94SFlorian Westphal ret = strncpy_from_sockptr(name, optval, 571aa1fbd94SFlorian Westphal min_t(long, TCP_CA_NAME_MAX - 1, optlen)); 572aa1fbd94SFlorian Westphal if (ret < 0) 573aa1fbd94SFlorian Westphal return -EFAULT; 574aa1fbd94SFlorian Westphal 575aa1fbd94SFlorian Westphal name[ret] = 0; 576aa1fbd94SFlorian Westphal 577aa1fbd94SFlorian Westphal cap_net_admin = ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN); 578aa1fbd94SFlorian Westphal 579aa1fbd94SFlorian Westphal ret = 0; 580aa1fbd94SFlorian Westphal lock_sock(sk); 581aa1fbd94SFlorian Westphal sockopt_seq_inc(msk); 582aa1fbd94SFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 583aa1fbd94SFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 584aa1fbd94SFlorian Westphal int err; 585aa1fbd94SFlorian Westphal 586aa1fbd94SFlorian Westphal lock_sock(ssk); 587aa1fbd94SFlorian Westphal err = tcp_set_congestion_control(ssk, name, true, cap_net_admin); 588aa1fbd94SFlorian Westphal if (err < 0 && ret == 0) 589aa1fbd94SFlorian Westphal ret = err; 590aa1fbd94SFlorian Westphal subflow->setsockopt_seq = msk->setsockopt_seq; 591aa1fbd94SFlorian Westphal release_sock(ssk); 592aa1fbd94SFlorian Westphal } 593aa1fbd94SFlorian Westphal 594aa1fbd94SFlorian Westphal if (ret == 0) 59520b5759fSPaolo Abeni strcpy(msk->ca_name, name); 596aa1fbd94SFlorian Westphal 597aa1fbd94SFlorian Westphal release_sock(sk); 598aa1fbd94SFlorian Westphal return ret; 599aa1fbd94SFlorian Westphal } 600aa1fbd94SFlorian Westphal 601aa1fbd94SFlorian Westphal static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 602aa1fbd94SFlorian Westphal sockptr_t optval, unsigned int optlen) 603aa1fbd94SFlorian Westphal { 604aa1fbd94SFlorian Westphal switch (optname) { 605aa1fbd94SFlorian Westphal case TCP_ULP: 606aa1fbd94SFlorian Westphal return -EOPNOTSUPP; 607aa1fbd94SFlorian Westphal case TCP_CONGESTION: 608aa1fbd94SFlorian Westphal return mptcp_setsockopt_sol_tcp_congestion(msk, optval, optlen); 609aa1fbd94SFlorian Westphal } 610aa1fbd94SFlorian Westphal 611aa1fbd94SFlorian Westphal return -EOPNOTSUPP; 612aa1fbd94SFlorian Westphal } 613aa1fbd94SFlorian Westphal 6140abdde82SPaolo Abeni int mptcp_setsockopt(struct sock *sk, int level, int optname, 6150abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen) 6160abdde82SPaolo Abeni { 6170abdde82SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 6180abdde82SPaolo Abeni struct sock *ssk; 6190abdde82SPaolo Abeni 6200abdde82SPaolo Abeni pr_debug("msk=%p", msk); 6210abdde82SPaolo Abeni 6220abdde82SPaolo Abeni if (level == SOL_SOCKET) 6230abdde82SPaolo Abeni return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen); 6240abdde82SPaolo Abeni 6257a009a70SFlorian Westphal if (!mptcp_supported_sockopt(level, optname)) 6267a009a70SFlorian Westphal return -ENOPROTOOPT; 6277a009a70SFlorian Westphal 6280abdde82SPaolo Abeni /* @@ the meaning of setsockopt() when the socket is connected and 6290abdde82SPaolo Abeni * there are multiple subflows is not yet defined. It is up to the 6300abdde82SPaolo Abeni * MPTCP-level socket to configure the subflows until the subflow 6310abdde82SPaolo Abeni * is in TCP fallback, when TCP socket options are passed through 6320abdde82SPaolo Abeni * to the one remaining subflow. 6330abdde82SPaolo Abeni */ 6340abdde82SPaolo Abeni lock_sock(sk); 6350abdde82SPaolo Abeni ssk = __mptcp_tcp_fallback(msk); 6360abdde82SPaolo Abeni release_sock(sk); 6370abdde82SPaolo Abeni if (ssk) 6380abdde82SPaolo Abeni return tcp_setsockopt(ssk, level, optname, optval, optlen); 6390abdde82SPaolo Abeni 6400abdde82SPaolo Abeni if (level == SOL_IPV6) 6410abdde82SPaolo Abeni return mptcp_setsockopt_v6(msk, optname, optval, optlen); 6420abdde82SPaolo Abeni 643aa1fbd94SFlorian Westphal if (level == SOL_TCP) 644aa1fbd94SFlorian Westphal return mptcp_setsockopt_sol_tcp(msk, optname, optval, optlen); 645aa1fbd94SFlorian Westphal 646aa1fbd94SFlorian Westphal return -EOPNOTSUPP; 647aa1fbd94SFlorian Westphal } 648aa1fbd94SFlorian Westphal 649aa1fbd94SFlorian Westphal static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, 650aa1fbd94SFlorian Westphal char __user *optval, int __user *optlen) 651aa1fbd94SFlorian Westphal { 652aa1fbd94SFlorian Westphal struct sock *sk = (struct sock *)msk; 653aa1fbd94SFlorian Westphal struct socket *ssock; 654aa1fbd94SFlorian Westphal int ret = -EINVAL; 655aa1fbd94SFlorian Westphal struct sock *ssk; 656aa1fbd94SFlorian Westphal 657aa1fbd94SFlorian Westphal lock_sock(sk); 658aa1fbd94SFlorian Westphal ssk = msk->first; 659aa1fbd94SFlorian Westphal if (ssk) { 660aa1fbd94SFlorian Westphal ret = tcp_getsockopt(ssk, level, optname, optval, optlen); 661aa1fbd94SFlorian Westphal goto out; 662aa1fbd94SFlorian Westphal } 663aa1fbd94SFlorian Westphal 664aa1fbd94SFlorian Westphal ssock = __mptcp_nmpc_socket(msk); 665aa1fbd94SFlorian Westphal if (!ssock) 666aa1fbd94SFlorian Westphal goto out; 667aa1fbd94SFlorian Westphal 668aa1fbd94SFlorian Westphal ret = tcp_getsockopt(ssock->sk, level, optname, optval, optlen); 669aa1fbd94SFlorian Westphal 670aa1fbd94SFlorian Westphal out: 671aa1fbd94SFlorian Westphal release_sock(sk); 672aa1fbd94SFlorian Westphal return ret; 673aa1fbd94SFlorian Westphal } 674aa1fbd94SFlorian Westphal 67561bc6e82SFlorian Westphal void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info) 67661bc6e82SFlorian Westphal { 67761bc6e82SFlorian Westphal struct sock *sk = &msk->sk.icsk_inet.sk; 67861bc6e82SFlorian Westphal u32 flags = 0; 67955c42fa7SFlorian Westphal bool slow; 68061bc6e82SFlorian Westphal u8 val; 68161bc6e82SFlorian Westphal 68255c42fa7SFlorian Westphal memset(info, 0, sizeof(*info)); 68355c42fa7SFlorian Westphal 68455c42fa7SFlorian Westphal slow = lock_sock_fast(sk); 68555c42fa7SFlorian Westphal 68661bc6e82SFlorian Westphal info->mptcpi_subflows = READ_ONCE(msk->pm.subflows); 68761bc6e82SFlorian Westphal info->mptcpi_add_addr_signal = READ_ONCE(msk->pm.add_addr_signaled); 68861bc6e82SFlorian Westphal info->mptcpi_add_addr_accepted = READ_ONCE(msk->pm.add_addr_accepted); 68961bc6e82SFlorian Westphal info->mptcpi_local_addr_used = READ_ONCE(msk->pm.local_addr_used); 69061bc6e82SFlorian Westphal info->mptcpi_subflows_max = mptcp_pm_get_subflows_max(msk); 69161bc6e82SFlorian Westphal val = mptcp_pm_get_add_addr_signal_max(msk); 69261bc6e82SFlorian Westphal info->mptcpi_add_addr_signal_max = val; 69361bc6e82SFlorian Westphal val = mptcp_pm_get_add_addr_accept_max(msk); 69461bc6e82SFlorian Westphal info->mptcpi_add_addr_accepted_max = val; 69561bc6e82SFlorian Westphal info->mptcpi_local_addr_max = mptcp_pm_get_local_addr_max(msk); 69661bc6e82SFlorian Westphal if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) 69761bc6e82SFlorian Westphal flags |= MPTCP_INFO_FLAG_FALLBACK; 69861bc6e82SFlorian Westphal if (READ_ONCE(msk->can_ack)) 69961bc6e82SFlorian Westphal flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED; 70061bc6e82SFlorian Westphal info->mptcpi_flags = flags; 70161bc6e82SFlorian Westphal info->mptcpi_token = READ_ONCE(msk->token); 70261bc6e82SFlorian Westphal info->mptcpi_write_seq = READ_ONCE(msk->write_seq); 70361bc6e82SFlorian Westphal info->mptcpi_snd_una = READ_ONCE(msk->snd_una); 70461bc6e82SFlorian Westphal info->mptcpi_rcv_nxt = READ_ONCE(msk->ack_seq); 70561bc6e82SFlorian Westphal info->mptcpi_csum_enabled = READ_ONCE(msk->csum_enabled); 70661bc6e82SFlorian Westphal 70761bc6e82SFlorian Westphal unlock_sock_fast(sk, slow); 70861bc6e82SFlorian Westphal } 70961bc6e82SFlorian Westphal EXPORT_SYMBOL_GPL(mptcp_diag_fill_info); 71061bc6e82SFlorian Westphal 71155c42fa7SFlorian Westphal static int mptcp_getsockopt_info(struct mptcp_sock *msk, char __user *optval, int __user *optlen) 71255c42fa7SFlorian Westphal { 71355c42fa7SFlorian Westphal struct mptcp_info m_info; 71455c42fa7SFlorian Westphal int len; 71555c42fa7SFlorian Westphal 71655c42fa7SFlorian Westphal if (get_user(len, optlen)) 71755c42fa7SFlorian Westphal return -EFAULT; 71855c42fa7SFlorian Westphal 71955c42fa7SFlorian Westphal len = min_t(unsigned int, len, sizeof(struct mptcp_info)); 72055c42fa7SFlorian Westphal 72155c42fa7SFlorian Westphal mptcp_diag_fill_info(msk, &m_info); 72255c42fa7SFlorian Westphal 72355c42fa7SFlorian Westphal if (put_user(len, optlen)) 72455c42fa7SFlorian Westphal return -EFAULT; 72555c42fa7SFlorian Westphal 72655c42fa7SFlorian Westphal if (copy_to_user(optval, &m_info, len)) 72755c42fa7SFlorian Westphal return -EFAULT; 72855c42fa7SFlorian Westphal 72955c42fa7SFlorian Westphal return 0; 73055c42fa7SFlorian Westphal } 73155c42fa7SFlorian Westphal 73206f15ceeSFlorian Westphal static int mptcp_put_subflow_data(struct mptcp_subflow_data *sfd, 73306f15ceeSFlorian Westphal char __user *optval, 73406f15ceeSFlorian Westphal u32 copied, 73506f15ceeSFlorian Westphal int __user *optlen) 73606f15ceeSFlorian Westphal { 73706f15ceeSFlorian Westphal u32 copylen = min_t(u32, sfd->size_subflow_data, sizeof(*sfd)); 73806f15ceeSFlorian Westphal 73906f15ceeSFlorian Westphal if (copied) 74006f15ceeSFlorian Westphal copied += sfd->size_subflow_data; 74106f15ceeSFlorian Westphal else 74206f15ceeSFlorian Westphal copied = copylen; 74306f15ceeSFlorian Westphal 74406f15ceeSFlorian Westphal if (put_user(copied, optlen)) 74506f15ceeSFlorian Westphal return -EFAULT; 74606f15ceeSFlorian Westphal 74706f15ceeSFlorian Westphal if (copy_to_user(optval, sfd, copylen)) 74806f15ceeSFlorian Westphal return -EFAULT; 74906f15ceeSFlorian Westphal 75006f15ceeSFlorian Westphal return 0; 75106f15ceeSFlorian Westphal } 75206f15ceeSFlorian Westphal 75306f15ceeSFlorian Westphal static int mptcp_get_subflow_data(struct mptcp_subflow_data *sfd, 75406f15ceeSFlorian Westphal char __user *optval, int __user *optlen) 75506f15ceeSFlorian Westphal { 75606f15ceeSFlorian Westphal int len, copylen; 75706f15ceeSFlorian Westphal 75806f15ceeSFlorian Westphal if (get_user(len, optlen)) 75906f15ceeSFlorian Westphal return -EFAULT; 76006f15ceeSFlorian Westphal 76106f15ceeSFlorian Westphal /* if mptcp_subflow_data size is changed, need to adjust 76206f15ceeSFlorian Westphal * this function to deal with programs using old version. 76306f15ceeSFlorian Westphal */ 76406f15ceeSFlorian Westphal BUILD_BUG_ON(sizeof(*sfd) != MIN_INFO_OPTLEN_SIZE); 76506f15ceeSFlorian Westphal 76606f15ceeSFlorian Westphal if (len < MIN_INFO_OPTLEN_SIZE) 76706f15ceeSFlorian Westphal return -EINVAL; 76806f15ceeSFlorian Westphal 76906f15ceeSFlorian Westphal memset(sfd, 0, sizeof(*sfd)); 77006f15ceeSFlorian Westphal 77106f15ceeSFlorian Westphal copylen = min_t(unsigned int, len, sizeof(*sfd)); 77206f15ceeSFlorian Westphal if (copy_from_user(sfd, optval, copylen)) 77306f15ceeSFlorian Westphal return -EFAULT; 77406f15ceeSFlorian Westphal 77506f15ceeSFlorian Westphal /* size_subflow_data is u32, but len is signed */ 77606f15ceeSFlorian Westphal if (sfd->size_subflow_data > INT_MAX || 77706f15ceeSFlorian Westphal sfd->size_user > INT_MAX) 77806f15ceeSFlorian Westphal return -EINVAL; 77906f15ceeSFlorian Westphal 78006f15ceeSFlorian Westphal if (sfd->size_subflow_data < MIN_INFO_OPTLEN_SIZE || 78106f15ceeSFlorian Westphal sfd->size_subflow_data > len) 78206f15ceeSFlorian Westphal return -EINVAL; 78306f15ceeSFlorian Westphal 78406f15ceeSFlorian Westphal if (sfd->num_subflows || sfd->size_kernel) 78506f15ceeSFlorian Westphal return -EINVAL; 78606f15ceeSFlorian Westphal 78706f15ceeSFlorian Westphal return len - sfd->size_subflow_data; 78806f15ceeSFlorian Westphal } 78906f15ceeSFlorian Westphal 79006f15ceeSFlorian Westphal static int mptcp_getsockopt_tcpinfo(struct mptcp_sock *msk, char __user *optval, 79106f15ceeSFlorian Westphal int __user *optlen) 79206f15ceeSFlorian Westphal { 79306f15ceeSFlorian Westphal struct mptcp_subflow_context *subflow; 79406f15ceeSFlorian Westphal struct sock *sk = &msk->sk.icsk_inet.sk; 79506f15ceeSFlorian Westphal unsigned int sfcount = 0, copied = 0; 79606f15ceeSFlorian Westphal struct mptcp_subflow_data sfd; 79706f15ceeSFlorian Westphal char __user *infoptr; 79806f15ceeSFlorian Westphal int len; 79906f15ceeSFlorian Westphal 80006f15ceeSFlorian Westphal len = mptcp_get_subflow_data(&sfd, optval, optlen); 80106f15ceeSFlorian Westphal if (len < 0) 80206f15ceeSFlorian Westphal return len; 80306f15ceeSFlorian Westphal 80406f15ceeSFlorian Westphal sfd.size_kernel = sizeof(struct tcp_info); 80506f15ceeSFlorian Westphal sfd.size_user = min_t(unsigned int, sfd.size_user, 80606f15ceeSFlorian Westphal sizeof(struct tcp_info)); 80706f15ceeSFlorian Westphal 80806f15ceeSFlorian Westphal infoptr = optval + sfd.size_subflow_data; 80906f15ceeSFlorian Westphal 81006f15ceeSFlorian Westphal lock_sock(sk); 81106f15ceeSFlorian Westphal 81206f15ceeSFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 81306f15ceeSFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 81406f15ceeSFlorian Westphal 81506f15ceeSFlorian Westphal ++sfcount; 81606f15ceeSFlorian Westphal 81706f15ceeSFlorian Westphal if (len && len >= sfd.size_user) { 81806f15ceeSFlorian Westphal struct tcp_info info; 81906f15ceeSFlorian Westphal 82006f15ceeSFlorian Westphal tcp_get_info(ssk, &info); 82106f15ceeSFlorian Westphal 82206f15ceeSFlorian Westphal if (copy_to_user(infoptr, &info, sfd.size_user)) { 82306f15ceeSFlorian Westphal release_sock(sk); 82406f15ceeSFlorian Westphal return -EFAULT; 82506f15ceeSFlorian Westphal } 82606f15ceeSFlorian Westphal 82706f15ceeSFlorian Westphal infoptr += sfd.size_user; 82806f15ceeSFlorian Westphal copied += sfd.size_user; 82906f15ceeSFlorian Westphal len -= sfd.size_user; 83006f15ceeSFlorian Westphal } 83106f15ceeSFlorian Westphal } 83206f15ceeSFlorian Westphal 83306f15ceeSFlorian Westphal release_sock(sk); 83406f15ceeSFlorian Westphal 83506f15ceeSFlorian Westphal sfd.num_subflows = sfcount; 83606f15ceeSFlorian Westphal 83706f15ceeSFlorian Westphal if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) 83806f15ceeSFlorian Westphal return -EFAULT; 83906f15ceeSFlorian Westphal 84006f15ceeSFlorian Westphal return 0; 84106f15ceeSFlorian Westphal } 84206f15ceeSFlorian Westphal 843c11c5906SFlorian Westphal static void mptcp_get_sub_addrs(const struct sock *sk, struct mptcp_subflow_addrs *a) 844c11c5906SFlorian Westphal { 845c11c5906SFlorian Westphal struct inet_sock *inet = inet_sk(sk); 846c11c5906SFlorian Westphal 847c11c5906SFlorian Westphal memset(a, 0, sizeof(*a)); 848c11c5906SFlorian Westphal 849c11c5906SFlorian Westphal if (sk->sk_family == AF_INET) { 850c11c5906SFlorian Westphal a->sin_local.sin_family = AF_INET; 851c11c5906SFlorian Westphal a->sin_local.sin_port = inet->inet_sport; 852c11c5906SFlorian Westphal a->sin_local.sin_addr.s_addr = inet->inet_rcv_saddr; 853c11c5906SFlorian Westphal 854c11c5906SFlorian Westphal if (!a->sin_local.sin_addr.s_addr) 855c11c5906SFlorian Westphal a->sin_local.sin_addr.s_addr = inet->inet_saddr; 856c11c5906SFlorian Westphal 857c11c5906SFlorian Westphal a->sin_remote.sin_family = AF_INET; 858c11c5906SFlorian Westphal a->sin_remote.sin_port = inet->inet_dport; 859c11c5906SFlorian Westphal a->sin_remote.sin_addr.s_addr = inet->inet_daddr; 860c11c5906SFlorian Westphal #if IS_ENABLED(CONFIG_IPV6) 861c11c5906SFlorian Westphal } else if (sk->sk_family == AF_INET6) { 862c11c5906SFlorian Westphal const struct ipv6_pinfo *np = inet6_sk(sk); 863c11c5906SFlorian Westphal 864*29211e7dSTim Gardner if (WARN_ON_ONCE(!np)) 865*29211e7dSTim Gardner return; 866*29211e7dSTim Gardner 867c11c5906SFlorian Westphal a->sin6_local.sin6_family = AF_INET6; 868c11c5906SFlorian Westphal a->sin6_local.sin6_port = inet->inet_sport; 869c11c5906SFlorian Westphal 870c11c5906SFlorian Westphal if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 871c11c5906SFlorian Westphal a->sin6_local.sin6_addr = np->saddr; 872c11c5906SFlorian Westphal else 873c11c5906SFlorian Westphal a->sin6_local.sin6_addr = sk->sk_v6_rcv_saddr; 874c11c5906SFlorian Westphal 875c11c5906SFlorian Westphal a->sin6_remote.sin6_family = AF_INET6; 876c11c5906SFlorian Westphal a->sin6_remote.sin6_port = inet->inet_dport; 877c11c5906SFlorian Westphal a->sin6_remote.sin6_addr = sk->sk_v6_daddr; 878c11c5906SFlorian Westphal #endif 879c11c5906SFlorian Westphal } 880c11c5906SFlorian Westphal } 881c11c5906SFlorian Westphal 882c11c5906SFlorian Westphal static int mptcp_getsockopt_subflow_addrs(struct mptcp_sock *msk, char __user *optval, 883c11c5906SFlorian Westphal int __user *optlen) 884c11c5906SFlorian Westphal { 885c11c5906SFlorian Westphal struct sock *sk = &msk->sk.icsk_inet.sk; 886c11c5906SFlorian Westphal struct mptcp_subflow_context *subflow; 887c11c5906SFlorian Westphal unsigned int sfcount = 0, copied = 0; 888c11c5906SFlorian Westphal struct mptcp_subflow_data sfd; 889c11c5906SFlorian Westphal char __user *addrptr; 890c11c5906SFlorian Westphal int len; 891c11c5906SFlorian Westphal 892c11c5906SFlorian Westphal len = mptcp_get_subflow_data(&sfd, optval, optlen); 893c11c5906SFlorian Westphal if (len < 0) 894c11c5906SFlorian Westphal return len; 895c11c5906SFlorian Westphal 896c11c5906SFlorian Westphal sfd.size_kernel = sizeof(struct mptcp_subflow_addrs); 897c11c5906SFlorian Westphal sfd.size_user = min_t(unsigned int, sfd.size_user, 898c11c5906SFlorian Westphal sizeof(struct mptcp_subflow_addrs)); 899c11c5906SFlorian Westphal 900c11c5906SFlorian Westphal addrptr = optval + sfd.size_subflow_data; 901c11c5906SFlorian Westphal 902c11c5906SFlorian Westphal lock_sock(sk); 903c11c5906SFlorian Westphal 904c11c5906SFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 905c11c5906SFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 906c11c5906SFlorian Westphal 907c11c5906SFlorian Westphal ++sfcount; 908c11c5906SFlorian Westphal 909c11c5906SFlorian Westphal if (len && len >= sfd.size_user) { 910c11c5906SFlorian Westphal struct mptcp_subflow_addrs a; 911c11c5906SFlorian Westphal 912c11c5906SFlorian Westphal mptcp_get_sub_addrs(ssk, &a); 913c11c5906SFlorian Westphal 914c11c5906SFlorian Westphal if (copy_to_user(addrptr, &a, sfd.size_user)) { 915c11c5906SFlorian Westphal release_sock(sk); 916c11c5906SFlorian Westphal return -EFAULT; 917c11c5906SFlorian Westphal } 918c11c5906SFlorian Westphal 919c11c5906SFlorian Westphal addrptr += sfd.size_user; 920c11c5906SFlorian Westphal copied += sfd.size_user; 921c11c5906SFlorian Westphal len -= sfd.size_user; 922c11c5906SFlorian Westphal } 923c11c5906SFlorian Westphal } 924c11c5906SFlorian Westphal 925c11c5906SFlorian Westphal release_sock(sk); 926c11c5906SFlorian Westphal 927c11c5906SFlorian Westphal sfd.num_subflows = sfcount; 928c11c5906SFlorian Westphal 929c11c5906SFlorian Westphal if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) 930c11c5906SFlorian Westphal return -EFAULT; 931c11c5906SFlorian Westphal 932c11c5906SFlorian Westphal return 0; 933c11c5906SFlorian Westphal } 934c11c5906SFlorian Westphal 935aa1fbd94SFlorian Westphal static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 936aa1fbd94SFlorian Westphal char __user *optval, int __user *optlen) 937aa1fbd94SFlorian Westphal { 938aa1fbd94SFlorian Westphal switch (optname) { 939aa1fbd94SFlorian Westphal case TCP_ULP: 940aa1fbd94SFlorian Westphal case TCP_CONGESTION: 941aa1fbd94SFlorian Westphal case TCP_INFO: 942aa1fbd94SFlorian Westphal case TCP_CC_INFO: 943aa1fbd94SFlorian Westphal return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname, 944aa1fbd94SFlorian Westphal optval, optlen); 945aa1fbd94SFlorian Westphal } 9460abdde82SPaolo Abeni return -EOPNOTSUPP; 9470abdde82SPaolo Abeni } 9480abdde82SPaolo Abeni 94955c42fa7SFlorian Westphal static int mptcp_getsockopt_sol_mptcp(struct mptcp_sock *msk, int optname, 95055c42fa7SFlorian Westphal char __user *optval, int __user *optlen) 95155c42fa7SFlorian Westphal { 95255c42fa7SFlorian Westphal switch (optname) { 95355c42fa7SFlorian Westphal case MPTCP_INFO: 95455c42fa7SFlorian Westphal return mptcp_getsockopt_info(msk, optval, optlen); 95506f15ceeSFlorian Westphal case MPTCP_TCPINFO: 95606f15ceeSFlorian Westphal return mptcp_getsockopt_tcpinfo(msk, optval, optlen); 957c11c5906SFlorian Westphal case MPTCP_SUBFLOW_ADDRS: 958c11c5906SFlorian Westphal return mptcp_getsockopt_subflow_addrs(msk, optval, optlen); 95955c42fa7SFlorian Westphal } 96055c42fa7SFlorian Westphal 96155c42fa7SFlorian Westphal return -EOPNOTSUPP; 96255c42fa7SFlorian Westphal } 96355c42fa7SFlorian Westphal 9640abdde82SPaolo Abeni int mptcp_getsockopt(struct sock *sk, int level, int optname, 9650abdde82SPaolo Abeni char __user *optval, int __user *option) 9660abdde82SPaolo Abeni { 9670abdde82SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 9680abdde82SPaolo Abeni struct sock *ssk; 9690abdde82SPaolo Abeni 9700abdde82SPaolo Abeni pr_debug("msk=%p", msk); 9710abdde82SPaolo Abeni 9720abdde82SPaolo Abeni /* @@ the meaning of setsockopt() when the socket is connected and 9730abdde82SPaolo Abeni * there are multiple subflows is not yet defined. It is up to the 9740abdde82SPaolo Abeni * MPTCP-level socket to configure the subflows until the subflow 9750abdde82SPaolo Abeni * is in TCP fallback, when socket options are passed through 9760abdde82SPaolo Abeni * to the one remaining subflow. 9770abdde82SPaolo Abeni */ 9780abdde82SPaolo Abeni lock_sock(sk); 9790abdde82SPaolo Abeni ssk = __mptcp_tcp_fallback(msk); 9800abdde82SPaolo Abeni release_sock(sk); 9810abdde82SPaolo Abeni if (ssk) 9820abdde82SPaolo Abeni return tcp_getsockopt(ssk, level, optname, optval, option); 9830abdde82SPaolo Abeni 984aa1fbd94SFlorian Westphal if (level == SOL_TCP) 985aa1fbd94SFlorian Westphal return mptcp_getsockopt_sol_tcp(msk, optname, optval, option); 98655c42fa7SFlorian Westphal if (level == SOL_MPTCP) 98755c42fa7SFlorian Westphal return mptcp_getsockopt_sol_mptcp(msk, optname, optval, option); 9880abdde82SPaolo Abeni return -EOPNOTSUPP; 9890abdde82SPaolo Abeni } 9900abdde82SPaolo Abeni 9911b3e7edeSFlorian Westphal static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk) 9921b3e7edeSFlorian Westphal { 9935d0a6bc8SFlorian Westphal static const unsigned int tx_rx_locks = SOCK_RCVBUF_LOCK | SOCK_SNDBUF_LOCK; 9941b3e7edeSFlorian Westphal struct sock *sk = (struct sock *)msk; 9951b3e7edeSFlorian Westphal 9961b3e7edeSFlorian Westphal if (ssk->sk_prot->keepalive) { 9971b3e7edeSFlorian Westphal if (sock_flag(sk, SOCK_KEEPOPEN)) 9981b3e7edeSFlorian Westphal ssk->sk_prot->keepalive(ssk, 1); 9991b3e7edeSFlorian Westphal else 10001b3e7edeSFlorian Westphal ssk->sk_prot->keepalive(ssk, 0); 10011b3e7edeSFlorian Westphal } 10021b3e7edeSFlorian Westphal 10031b3e7edeSFlorian Westphal ssk->sk_priority = sk->sk_priority; 10045d0a6bc8SFlorian Westphal ssk->sk_bound_dev_if = sk->sk_bound_dev_if; 10055d0a6bc8SFlorian Westphal ssk->sk_incoming_cpu = sk->sk_incoming_cpu; 10065d0a6bc8SFlorian Westphal 10075d0a6bc8SFlorian Westphal if (sk->sk_userlocks & tx_rx_locks) { 10085d0a6bc8SFlorian Westphal ssk->sk_userlocks |= sk->sk_userlocks & tx_rx_locks; 10095d0a6bc8SFlorian Westphal if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 10105d0a6bc8SFlorian Westphal WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); 10115d0a6bc8SFlorian Westphal if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) 10125d0a6bc8SFlorian Westphal WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); 10135d0a6bc8SFlorian Westphal } 10145d0a6bc8SFlorian Westphal 10155d0a6bc8SFlorian Westphal if (sock_flag(sk, SOCK_LINGER)) { 10165d0a6bc8SFlorian Westphal ssk->sk_lingertime = sk->sk_lingertime; 10175d0a6bc8SFlorian Westphal sock_set_flag(ssk, SOCK_LINGER); 10185d0a6bc8SFlorian Westphal } else { 10195d0a6bc8SFlorian Westphal sock_reset_flag(ssk, SOCK_LINGER); 10205d0a6bc8SFlorian Westphal } 10215d0a6bc8SFlorian Westphal 10225d0a6bc8SFlorian Westphal if (sk->sk_mark != ssk->sk_mark) { 10235d0a6bc8SFlorian Westphal ssk->sk_mark = sk->sk_mark; 10245d0a6bc8SFlorian Westphal sk_dst_reset(ssk); 10255d0a6bc8SFlorian Westphal } 10265d0a6bc8SFlorian Westphal 10275d0a6bc8SFlorian Westphal sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG)); 10285d0a6bc8SFlorian Westphal 10295d0a6bc8SFlorian Westphal if (inet_csk(sk)->icsk_ca_ops != inet_csk(ssk)->icsk_ca_ops) 103020b5759fSPaolo Abeni tcp_set_congestion_control(ssk, msk->ca_name, false, true); 10311b3e7edeSFlorian Westphal } 10321b3e7edeSFlorian Westphal 1033df00b087SFlorian Westphal static void __mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk) 1034df00b087SFlorian Westphal { 10351b3e7edeSFlorian Westphal bool slow = lock_sock_fast(ssk); 10361b3e7edeSFlorian Westphal 10371b3e7edeSFlorian Westphal sync_socket_options(msk, ssk); 10381b3e7edeSFlorian Westphal 10391b3e7edeSFlorian Westphal unlock_sock_fast(ssk, slow); 1040df00b087SFlorian Westphal } 1041df00b087SFlorian Westphal 104278962489SFlorian Westphal void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk) 104378962489SFlorian Westphal { 1044df00b087SFlorian Westphal struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1045df00b087SFlorian Westphal 104678962489SFlorian Westphal msk_owned_by_me(msk); 1047df00b087SFlorian Westphal 1048df00b087SFlorian Westphal if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { 1049df00b087SFlorian Westphal __mptcp_sockopt_sync(msk, ssk); 1050df00b087SFlorian Westphal 1051df00b087SFlorian Westphal subflow->setsockopt_seq = msk->setsockopt_seq; 1052df00b087SFlorian Westphal } 105378962489SFlorian Westphal } 105478962489SFlorian Westphal 105578962489SFlorian Westphal void mptcp_sockopt_sync_all(struct mptcp_sock *msk) 105678962489SFlorian Westphal { 105778962489SFlorian Westphal struct mptcp_subflow_context *subflow; 1058df00b087SFlorian Westphal struct sock *sk = (struct sock *)msk; 1059df00b087SFlorian Westphal u32 seq; 106078962489SFlorian Westphal 1061df00b087SFlorian Westphal seq = sockopt_seq_reset(sk); 106278962489SFlorian Westphal 106378962489SFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 106478962489SFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1065df00b087SFlorian Westphal u32 sseq = READ_ONCE(subflow->setsockopt_seq); 106678962489SFlorian Westphal 1067df00b087SFlorian Westphal if (sseq != msk->setsockopt_seq) { 1068df00b087SFlorian Westphal __mptcp_sockopt_sync(msk, ssk); 1069df00b087SFlorian Westphal WRITE_ONCE(subflow->setsockopt_seq, seq); 1070df00b087SFlorian Westphal } else if (sseq != seq) { 1071df00b087SFlorian Westphal WRITE_ONCE(subflow->setsockopt_seq, seq); 1072df00b087SFlorian Westphal } 107378962489SFlorian Westphal 107478962489SFlorian Westphal cond_resched(); 107578962489SFlorian Westphal } 1076df00b087SFlorian Westphal 1077df00b087SFlorian Westphal msk->setsockopt_seq = seq; 107878962489SFlorian Westphal } 1079