| // SPDX-License-Identifier: GPL-2.0 |
| /* Multipath TCP |
| * |
| * Copyright (c) 2021, Red Hat. |
| */ |
| |
| #define pr_fmt(fmt) "MPTCP: " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <net/sock.h> |
| #include <net/protocol.h> |
| #include <net/tcp.h> |
| #include <net/mptcp.h> |
| #include "protocol.h" |
| |
| #define MIN_INFO_OPTLEN_SIZE 16 |
| |
| static struct sock *__mptcp_tcp_fallback(struct mptcp_sock *msk) |
| { |
| sock_owned_by_me((const struct sock *)msk); |
| |
| if (likely(!__mptcp_check_fallback(msk))) |
| return NULL; |
| |
| return msk->first; |
| } |
| |
| static u32 sockopt_seq_reset(const struct sock *sk) |
| { |
| sock_owned_by_me(sk); |
| |
| /* Highbits contain state. Allows to distinguish sockopt_seq |
| * of listener and established: |
| * s0 = new_listener() |
| * sockopt(s0) - seq is 1 |
| * s1 = accept(s0) - s1 inherits seq 1 if listener sk (s0) |
| * sockopt(s0) - seq increments to 2 on s0 |
| * sockopt(s1) // seq increments to 2 on s1 (different option) |
| * new ssk completes join, inherits options from s0 // seq 2 |
| * Needs sync from mptcp join logic, but ssk->seq == msk->seq |
| * |
| * Set High order bits to sk_state so ssk->seq == msk->seq test |
| * will fail. |
| */ |
| |
| return (u32)sk->sk_state << 24u; |
| } |
| |
| static void sockopt_seq_inc(struct mptcp_sock *msk) |
| { |
| u32 seq = (msk->setsockopt_seq + 1) & 0x00ffffff; |
| |
| msk->setsockopt_seq = sockopt_seq_reset((struct sock *)msk) + seq; |
| } |
| |
| static int mptcp_get_int_option(struct mptcp_sock *msk, sockptr_t optval, |
| unsigned int optlen, int *val) |
| { |
| if (optlen < sizeof(int)) |
| return -EINVAL; |
| |
| if (copy_from_sockptr(val, optval, sizeof(*val))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, int val) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct sock *sk = (struct sock *)msk; |
| |
| lock_sock(sk); |
| sockopt_seq_inc(msk); |
| |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| bool slow = lock_sock_fast(ssk); |
| |
| switch (optname) { |
| case SO_DEBUG: |
| sock_valbool_flag(ssk, SOCK_DBG, !!val); |
| break; |
| case SO_KEEPALIVE: |
| if (ssk->sk_prot->keepalive) |
| ssk->sk_prot->keepalive(ssk, !!val); |
| sock_valbool_flag(ssk, SOCK_KEEPOPEN, !!val); |
| break; |
| case SO_PRIORITY: |
| ssk->sk_priority = val; |
| break; |
| case SO_SNDBUF: |
| case SO_SNDBUFFORCE: |
| ssk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); |
| break; |
| case SO_RCVBUF: |
| case SO_RCVBUFFORCE: |
| ssk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); |
| break; |
| case SO_MARK: |
| if (READ_ONCE(ssk->sk_mark) != sk->sk_mark) { |
| ssk->sk_mark = sk->sk_mark; |
| sk_dst_reset(ssk); |
| } |
| break; |
| case SO_INCOMING_CPU: |
| WRITE_ONCE(ssk->sk_incoming_cpu, val); |
| break; |
| } |
| |
| subflow->setsockopt_seq = msk->setsockopt_seq; |
| unlock_sock_fast(ssk, slow); |
| } |
| |
| release_sock(sk); |
| } |
| |
| static int mptcp_sol_socket_intval(struct mptcp_sock *msk, int optname, int val) |
| { |
| sockptr_t optval = KERNEL_SOCKPTR(&val); |
| struct sock *sk = (struct sock *)msk; |
| int ret; |
| |
| ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, |
| optval, sizeof(val)); |
| if (ret) |
| return ret; |
| |
| mptcp_sol_socket_sync_intval(msk, optname, val); |
| return 0; |
| } |
| |
| static void mptcp_so_incoming_cpu(struct mptcp_sock *msk, int val) |
| { |
| struct sock *sk = (struct sock *)msk; |
| |
| WRITE_ONCE(sk->sk_incoming_cpu, val); |
| |
| mptcp_sol_socket_sync_intval(msk, SO_INCOMING_CPU, val); |
| } |
| |
| static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optname, int val) |
| { |
| sockptr_t optval = KERNEL_SOCKPTR(&val); |
| struct mptcp_subflow_context *subflow; |
| struct sock *sk = (struct sock *)msk; |
| int ret; |
| |
| ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, |
| optval, sizeof(val)); |
| if (ret) |
| return ret; |
| |
| lock_sock(sk); |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| bool slow = lock_sock_fast(ssk); |
| |
| sock_set_timestamp(sk, optname, !!val); |
| unlock_sock_fast(ssk, slow); |
| } |
| |
| release_sock(sk); |
| return 0; |
| } |
| |
| static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname, |
| sockptr_t optval, |
| unsigned int optlen) |
| { |
| int val, ret; |
| |
| ret = mptcp_get_int_option(msk, optval, optlen, &val); |
| if (ret) |
| return ret; |
| |
| switch (optname) { |
| case SO_KEEPALIVE: |
| mptcp_sol_socket_sync_intval(msk, optname, val); |
| return 0; |
| case SO_DEBUG: |
| case SO_MARK: |
| case SO_PRIORITY: |
| case SO_SNDBUF: |
| case SO_SNDBUFFORCE: |
| case SO_RCVBUF: |
| case SO_RCVBUFFORCE: |
| return mptcp_sol_socket_intval(msk, optname, val); |
| case SO_INCOMING_CPU: |
| mptcp_so_incoming_cpu(msk, val); |
| return 0; |
| case SO_TIMESTAMP_OLD: |
| case SO_TIMESTAMP_NEW: |
| case SO_TIMESTAMPNS_OLD: |
| case SO_TIMESTAMPNS_NEW: |
| return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val); |
| } |
| |
| return -ENOPROTOOPT; |
| } |
| |
| static int mptcp_setsockopt_sol_socket_timestamping(struct mptcp_sock *msk, |
| int optname, |
| sockptr_t optval, |
| unsigned int optlen) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct sock *sk = (struct sock *)msk; |
| struct so_timestamping timestamping; |
| int ret; |
| |
| if (optlen == sizeof(timestamping)) { |
| if (copy_from_sockptr(×tamping, optval, |
| sizeof(timestamping))) |
| return -EFAULT; |
| } else if (optlen == sizeof(int)) { |
| memset(×tamping, 0, sizeof(timestamping)); |
| |
| if (copy_from_sockptr(×tamping.flags, optval, sizeof(int))) |
| return -EFAULT; |
| } else { |
| return -EINVAL; |
| } |
| |
| ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, |
| KERNEL_SOCKPTR(×tamping), |
| sizeof(timestamping)); |
| if (ret) |
| return ret; |
| |
| lock_sock(sk); |
| |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| bool slow = lock_sock_fast(ssk); |
| |
| sock_set_timestamping(sk, optname, timestamping); |
| unlock_sock_fast(ssk, slow); |
| } |
| |
| release_sock(sk); |
| |
| return 0; |
| } |
| |
| static int mptcp_setsockopt_sol_socket_linger(struct mptcp_sock *msk, sockptr_t optval, |
| unsigned int optlen) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct sock *sk = (struct sock *)msk; |
| struct linger ling; |
| sockptr_t kopt; |
| int ret; |
| |
| if (optlen < sizeof(ling)) |
| return -EINVAL; |
| |
| if (copy_from_sockptr(&ling, optval, sizeof(ling))) |
| return -EFAULT; |
| |
| kopt = KERNEL_SOCKPTR(&ling); |
| ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, SO_LINGER, kopt, sizeof(ling)); |
| if (ret) |
| return ret; |
| |
| lock_sock(sk); |
| sockopt_seq_inc(msk); |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| bool slow = lock_sock_fast(ssk); |
| |
| if (!ling.l_onoff) { |
| sock_reset_flag(ssk, SOCK_LINGER); |
| } else { |
| ssk->sk_lingertime = sk->sk_lingertime; |
| sock_set_flag(ssk, SOCK_LINGER); |
| } |
| |
| subflow->setsockopt_seq = msk->setsockopt_seq; |
| unlock_sock_fast(ssk, slow); |
| } |
| |
| release_sock(sk); |
| return 0; |
| } |
| |
| static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname, |
| sockptr_t optval, unsigned int optlen) |
| { |
| struct sock *sk = (struct sock *)msk; |
| struct socket *ssock; |
| int ret; |
| |
| switch (optname) { |
| case SO_REUSEPORT: |
| case SO_REUSEADDR: |
| case SO_BINDTODEVICE: |
| case SO_BINDTOIFINDEX: |
| lock_sock(sk); |
| ssock = __mptcp_nmpc_socket(msk); |
| if (!ssock) { |
| release_sock(sk); |
| return -EINVAL; |
| } |
| |
| ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen); |
| if (ret == 0) { |
| if (optname == SO_REUSEPORT) |
| sk->sk_reuseport = ssock->sk->sk_reuseport; |
| else if (optname == SO_REUSEADDR) |
| sk->sk_reuse = ssock->sk->sk_reuse; |
| else if (optname == SO_BINDTODEVICE) |
| sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if; |
| else if (optname == SO_BINDTOIFINDEX) |
| sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if; |
| } |
| release_sock(sk); |
| return ret; |
| case SO_KEEPALIVE: |
| case SO_PRIORITY: |
| case SO_SNDBUF: |
| case SO_SNDBUFFORCE: |
| case SO_RCVBUF: |
| case SO_RCVBUFFORCE: |
| case SO_MARK: |
| case SO_INCOMING_CPU: |
| case SO_DEBUG: |
| case SO_TIMESTAMP_OLD: |
| case SO_TIMESTAMP_NEW: |
| case SO_TIMESTAMPNS_OLD: |
| case SO_TIMESTAMPNS_NEW: |
| return mptcp_setsockopt_sol_socket_int(msk, optname, optval, |
| optlen); |
| case SO_TIMESTAMPING_OLD: |
| case SO_TIMESTAMPING_NEW: |
| return mptcp_setsockopt_sol_socket_timestamping(msk, optname, |
| optval, optlen); |
| case SO_LINGER: |
| return mptcp_setsockopt_sol_socket_linger(msk, optval, optlen); |
| case SO_RCVLOWAT: |
| case SO_RCVTIMEO_OLD: |
| case SO_RCVTIMEO_NEW: |
| case SO_SNDTIMEO_OLD: |
| case SO_SNDTIMEO_NEW: |
| case SO_BUSY_POLL: |
| case SO_PREFER_BUSY_POLL: |
| case SO_BUSY_POLL_BUDGET: |
| /* No need to copy: only relevant for msk */ |
| return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen); |
| case SO_NO_CHECK: |
| case SO_DONTROUTE: |
| case SO_BROADCAST: |
| case SO_BSDCOMPAT: |
| case SO_PASSCRED: |
| case SO_PASSSEC: |
| case SO_RXQ_OVFL: |
| case SO_WIFI_STATUS: |
| case SO_NOFCS: |
| case SO_SELECT_ERR_QUEUE: |
| return 0; |
| } |
| |
| /* SO_OOBINLINE is not supported, let's avoid the related mess |
| * SO_ATTACH_FILTER, SO_ATTACH_BPF, SO_ATTACH_REUSEPORT_CBPF, |
| * SO_DETACH_REUSEPORT_BPF, SO_DETACH_FILTER, SO_LOCK_FILTER, |
| * we must be careful with subflows |
| * |
| * SO_ATTACH_REUSEPORT_EBPF is not supported, at it checks |
| * explicitly the sk_protocol field |
| * |
| * SO_PEEK_OFF is unsupported, as it is for plain TCP |
| * SO_MAX_PACING_RATE is unsupported, we must be careful with subflows |
| * SO_CNX_ADVICE is currently unsupported, could possibly be relevant, |
| * but likely needs careful design |
| * |
| * SO_ZEROCOPY is currently unsupported, TODO in sndmsg |
| * SO_TXTIME is currently unsupported |
| */ |
| |
| return -EOPNOTSUPP; |
| } |
| |
| static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname, |
| sockptr_t optval, unsigned int optlen) |
| { |
| struct sock *sk = (struct sock *)msk; |
| int ret = -EOPNOTSUPP; |
| struct socket *ssock; |
| |
| switch (optname) { |
| case IPV6_V6ONLY: |
| case IPV6_TRANSPARENT: |
| case IPV6_FREEBIND: |
| lock_sock(sk); |
| ssock = __mptcp_nmpc_socket(msk); |
| if (!ssock) { |
| release_sock(sk); |
| return -EINVAL; |
| } |
| |
| ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen); |
| if (ret != 0) { |
| release_sock(sk); |
| return ret; |
| } |
| |
| sockopt_seq_inc(msk); |
| |
| switch (optname) { |
| case IPV6_V6ONLY: |
| sk->sk_ipv6only = ssock->sk->sk_ipv6only; |
| break; |
| case IPV6_TRANSPARENT: |
| inet_sk(sk)->transparent = inet_sk(ssock->sk)->transparent; |
| break; |
| case IPV6_FREEBIND: |
| inet_sk(sk)->freebind = inet_sk(ssock->sk)->freebind; |
| break; |
| } |
| |
| release_sock(sk); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static bool mptcp_supported_sockopt(int level, int optname) |
| { |
| if (level == SOL_IP) { |
| switch (optname) { |
| /* should work fine */ |
| case IP_FREEBIND: |
| case IP_TRANSPARENT: |
| |
| /* the following are control cmsg related */ |
| case IP_PKTINFO: |
| case IP_RECVTTL: |
| case IP_RECVTOS: |
| case IP_RECVOPTS: |
| case IP_RETOPTS: |
| case IP_PASSSEC: |
| case IP_RECVORIGDSTADDR: |
| case IP_CHECKSUM: |
| case IP_RECVFRAGSIZE: |
| |
| /* common stuff that need some love */ |
| case IP_TOS: |
| case IP_TTL: |
| case IP_BIND_ADDRESS_NO_PORT: |
| case IP_MTU_DISCOVER: |
| case IP_RECVERR: |
| |
| /* possibly less common may deserve some love */ |
| case IP_MINTTL: |
| |
| /* the following is apparently a no-op for plain TCP */ |
| case IP_RECVERR_RFC4884: |
| return true; |
| } |
| |
| /* IP_OPTIONS is not supported, needs subflow care */ |
| /* IP_HDRINCL, IP_NODEFRAG are not supported, RAW specific */ |
| /* IP_MULTICAST_TTL, IP_MULTICAST_LOOP, IP_UNICAST_IF, |
| * IP_ADD_MEMBERSHIP, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP, |
| * IP_DROP_SOURCE_MEMBERSHIP, IP_BLOCK_SOURCE, IP_UNBLOCK_SOURCE, |
| * MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP MCAST_JOIN_SOURCE_GROUP, |
| * MCAST_LEAVE_SOURCE_GROUP, MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, |
| * MCAST_MSFILTER, IP_MULTICAST_ALL are not supported, better not deal |
| * with mcast stuff |
| */ |
| /* IP_IPSEC_POLICY, IP_XFRM_POLICY are nut supported, unrelated here */ |
| return false; |
| } |
| if (level == SOL_IPV6) { |
| switch (optname) { |
| case IPV6_V6ONLY: |
| |
| /* the following are control cmsg related */ |
| case IPV6_RECVPKTINFO: |
| case IPV6_2292PKTINFO: |
| case IPV6_RECVHOPLIMIT: |
| case IPV6_2292HOPLIMIT: |
| case IPV6_RECVRTHDR: |
| case IPV6_2292RTHDR: |
| case IPV6_RECVHOPOPTS: |
| case IPV6_2292HOPOPTS: |
| case IPV6_RECVDSTOPTS: |
| case IPV6_2292DSTOPTS: |
| case IPV6_RECVTCLASS: |
| case IPV6_FLOWINFO: |
| case IPV6_RECVPATHMTU: |
| case IPV6_RECVORIGDSTADDR: |
| case IPV6_RECVFRAGSIZE: |
| |
| /* the following ones need some love but are quite common */ |
| case IPV6_TCLASS: |
| case IPV6_TRANSPARENT: |
| case IPV6_FREEBIND: |
| case IPV6_PKTINFO: |
| case IPV6_2292PKTOPTIONS: |
| case IPV6_UNICAST_HOPS: |
| case IPV6_MTU_DISCOVER: |
| case IPV6_MTU: |
| case IPV6_RECVERR: |
| case IPV6_FLOWINFO_SEND: |
| case IPV6_FLOWLABEL_MGR: |
| case IPV6_MINHOPCOUNT: |
| case IPV6_DONTFRAG: |
| case IPV6_AUTOFLOWLABEL: |
| |
| /* the following one is a no-op for plain TCP */ |
| case IPV6_RECVERR_RFC4884: |
| return true; |
| } |
| |
| /* IPV6_HOPOPTS, IPV6_RTHDRDSTOPTS, IPV6_RTHDR, IPV6_DSTOPTS are |
| * not supported |
| */ |
| /* IPV6_MULTICAST_HOPS, IPV6_MULTICAST_LOOP, IPV6_UNICAST_IF, |
| * IPV6_MULTICAST_IF, IPV6_ADDRFORM, |
| * IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST, |
| * IPV6_LEAVE_ANYCAST, IPV6_MULTICAST_ALL, MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP, |
| * MCAST_JOIN_SOURCE_GROUP, MCAST_LEAVE_SOURCE_GROUP, |
| * MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, MCAST_MSFILTER |
| * are not supported better not deal with mcast |
| */ |
| /* IPV6_ROUTER_ALERT, IPV6_ROUTER_ALERT_ISOLATE are not supported, since are evil */ |
| |
| /* IPV6_IPSEC_POLICY, IPV6_XFRM_POLICY are not supported */ |
| /* IPV6_ADDR_PREFERENCES is not supported, we must be careful with subflows */ |
| return false; |
| } |
| if (level == SOL_TCP) { |
| switch (optname) { |
| /* the following are no-op or should work just fine */ |
| case TCP_THIN_DUPACK: |
| case TCP_DEFER_ACCEPT: |
| |
| /* the following need some love */ |
| case TCP_MAXSEG: |
| case TCP_NODELAY: |
| case TCP_THIN_LINEAR_TIMEOUTS: |
| case TCP_CONGESTION: |
| case TCP_CORK: |
| case TCP_KEEPIDLE: |
| case TCP_KEEPINTVL: |
| case TCP_KEEPCNT: |
| case TCP_SYNCNT: |
| case TCP_SAVE_SYN: |
| case TCP_LINGER2: |
| case TCP_WINDOW_CLAMP: |
| case TCP_QUICKACK: |
| case TCP_USER_TIMEOUT: |
| case TCP_TIMESTAMP: |
| case TCP_NOTSENT_LOWAT: |
| case TCP_TX_DELAY: |
| case TCP_INQ: |
| case TCP_FASTOPEN: |
| case TCP_FASTOPEN_CONNECT: |
| case TCP_FASTOPEN_KEY: |
| case TCP_FASTOPEN_NO_COOKIE: |
| return true; |
| } |
| |
| /* TCP_MD5SIG, TCP_MD5SIG_EXT are not supported, MD5 is not compatible with MPTCP */ |
| |
| /* TCP_REPAIR, TCP_REPAIR_QUEUE, TCP_QUEUE_SEQ, TCP_REPAIR_OPTIONS, |
| * TCP_REPAIR_WINDOW are not supported, better avoid this mess |
| */ |
| } |
| return false; |
| } |
| |
| static int mptcp_setsockopt_sol_tcp_congestion(struct mptcp_sock *msk, sockptr_t optval, |
| unsigned int optlen) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct sock *sk = (struct sock *)msk; |
| char name[TCP_CA_NAME_MAX]; |
| bool cap_net_admin; |
| int ret; |
| |
| if (optlen < 1) |
| return -EINVAL; |
| |
| ret = strncpy_from_sockptr(name, optval, |
| min_t(long, TCP_CA_NAME_MAX - 1, optlen)); |
| if (ret < 0) |
| return -EFAULT; |
| |
| name[ret] = 0; |
| |
| cap_net_admin = ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN); |
| |
| ret = 0; |
| lock_sock(sk); |
| sockopt_seq_inc(msk); |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| int err; |
| |
| lock_sock(ssk); |
| err = tcp_set_congestion_control(ssk, name, true, cap_net_admin); |
| if (err < 0 && ret == 0) |
| ret = err; |
| subflow->setsockopt_seq = msk->setsockopt_seq; |
| release_sock(ssk); |
| } |
| |
| if (ret == 0) |
| strcpy(msk->ca_name, name); |
| |
| release_sock(sk); |
| return ret; |
| } |
| |
| static int mptcp_setsockopt_sol_tcp_cork(struct mptcp_sock *msk, sockptr_t optval, |
| unsigned int optlen) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct sock *sk = (struct sock *)msk; |
| int val; |
| |
| if (optlen < sizeof(int)) |
| return -EINVAL; |
| |
| if (copy_from_sockptr(&val, optval, sizeof(val))) |
| return -EFAULT; |
| |
| lock_sock(sk); |
| sockopt_seq_inc(msk); |
| msk->cork = !!val; |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| |
| lock_sock(ssk); |
| __tcp_sock_set_cork(ssk, !!val); |
| release_sock(ssk); |
| } |
| if (!val) |
| mptcp_check_and_set_pending(sk); |
| release_sock(sk); |
| |
| return 0; |
| } |
| |
| static int mptcp_setsockopt_sol_tcp_nodelay(struct mptcp_sock *msk, sockptr_t optval, |
| unsigned int optlen) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct sock *sk = (struct sock *)msk; |
| int val; |
| |
| if (optlen < sizeof(int)) |
| return -EINVAL; |
| |
| if (copy_from_sockptr(&val, optval, sizeof(val))) |
| return -EFAULT; |
| |
| lock_sock(sk); |
| sockopt_seq_inc(msk); |
| msk->nodelay = !!val; |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| |
| lock_sock(ssk); |
| __tcp_sock_set_nodelay(ssk, !!val); |
| release_sock(ssk); |
| } |
| if (val) |
| mptcp_check_and_set_pending(sk); |
| release_sock(sk); |
| |
| return 0; |
| } |
| |
| static int mptcp_setsockopt_sol_ip_set_transparent(struct mptcp_sock *msk, int optname, |
| sockptr_t optval, unsigned int optlen) |
| { |
| struct sock *sk = (struct sock *)msk; |
| struct inet_sock *issk; |
| struct socket *ssock; |
| int err; |
| |
| err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen); |
| if (err != 0) |
| return err; |
| |
| lock_sock(sk); |
| |
| ssock = __mptcp_nmpc_socket(msk); |
| if (!ssock) { |
| release_sock(sk); |
| return -EINVAL; |
| } |
| |
| issk = inet_sk(ssock->sk); |
| |
| switch (optname) { |
| case IP_FREEBIND: |
| issk->freebind = inet_sk(sk)->freebind; |
| break; |
| case IP_TRANSPARENT: |
| issk->transparent = inet_sk(sk)->transparent; |
| break; |
| default: |
| release_sock(sk); |
| WARN_ON_ONCE(1); |
| return -EOPNOTSUPP; |
| } |
| |
| sockopt_seq_inc(msk); |
| release_sock(sk); |
| return 0; |
| } |
| |
| static int mptcp_setsockopt_v4_set_tos(struct mptcp_sock *msk, int optname, |
| sockptr_t optval, unsigned int optlen) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct sock *sk = (struct sock *)msk; |
| int err, val; |
| |
| err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen); |
| |
| if (err != 0) |
| return err; |
| |
| lock_sock(sk); |
| sockopt_seq_inc(msk); |
| val = inet_sk(sk)->tos; |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| |
| __ip_sock_set_tos(ssk, val); |
| } |
| release_sock(sk); |
| |
| return 0; |
| } |
| |
| static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname, |
| sockptr_t optval, unsigned int optlen) |
| { |
| switch (optname) { |
| case IP_FREEBIND: |
| case IP_TRANSPARENT: |
| return mptcp_setsockopt_sol_ip_set_transparent(msk, optname, optval, optlen); |
| case IP_TOS: |
| return mptcp_setsockopt_v4_set_tos(msk, optname, optval, optlen); |
| } |
| |
| return -EOPNOTSUPP; |
| } |
| |
| static int mptcp_setsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, |
| sockptr_t optval, unsigned int optlen) |
| { |
| struct socket *sock; |
| |
| /* Limit to first subflow, before the connection establishment */ |
| sock = __mptcp_nmpc_socket(msk); |
| if (!sock) |
| return -EINVAL; |
| |
| return tcp_setsockopt(sock->sk, level, optname, optval, optlen); |
| } |
| |
| static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname, |
| sockptr_t optval, unsigned int optlen) |
| { |
| struct sock *sk = (void *)msk; |
| int ret, val; |
| |
| switch (optname) { |
| case TCP_INQ: |
| ret = mptcp_get_int_option(msk, optval, optlen, &val); |
| if (ret) |
| return ret; |
| if (val < 0 || val > 1) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| msk->recvmsg_inq = !!val; |
| release_sock(sk); |
| return 0; |
| case TCP_ULP: |
| return -EOPNOTSUPP; |
| case TCP_CONGESTION: |
| return mptcp_setsockopt_sol_tcp_congestion(msk, optval, optlen); |
| case TCP_CORK: |
| return mptcp_setsockopt_sol_tcp_cork(msk, optval, optlen); |
| case TCP_NODELAY: |
| return mptcp_setsockopt_sol_tcp_nodelay(msk, optval, optlen); |
| case TCP_DEFER_ACCEPT: |
| /* See tcp.c: TCP_DEFER_ACCEPT does not fail */ |
| mptcp_setsockopt_first_sf_only(msk, SOL_TCP, optname, optval, optlen); |
| return 0; |
| case TCP_FASTOPEN: |
| case TCP_FASTOPEN_CONNECT: |
| case TCP_FASTOPEN_KEY: |
| case TCP_FASTOPEN_NO_COOKIE: |
| return mptcp_setsockopt_first_sf_only(msk, SOL_TCP, optname, |
| optval, optlen); |
| } |
| |
| return -EOPNOTSUPP; |
| } |
| |
| int mptcp_setsockopt(struct sock *sk, int level, int optname, |
| sockptr_t optval, unsigned int optlen) |
| { |
| struct mptcp_sock *msk = mptcp_sk(sk); |
| struct sock *ssk; |
| |
| pr_debug("msk=%p", msk); |
| |
| if (level == SOL_SOCKET) |
| return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen); |
| |
| if (!mptcp_supported_sockopt(level, optname)) |
| return -ENOPROTOOPT; |
| |
| /* @@ the meaning of setsockopt() when the socket is connected and |
| * there are multiple subflows is not yet defined. It is up to the |
| * MPTCP-level socket to configure the subflows until the subflow |
| * is in TCP fallback, when TCP socket options are passed through |
| * to the one remaining subflow. |
| */ |
| lock_sock(sk); |
| ssk = __mptcp_tcp_fallback(msk); |
| release_sock(sk); |
| if (ssk) |
| return tcp_setsockopt(ssk, level, optname, optval, optlen); |
| |
| if (level == SOL_IP) |
| return mptcp_setsockopt_v4(msk, optname, optval, optlen); |
| |
| if (level == SOL_IPV6) |
| return mptcp_setsockopt_v6(msk, optname, optval, optlen); |
| |
| if (level == SOL_TCP) |
| return mptcp_setsockopt_sol_tcp(msk, optname, optval, optlen); |
| |
| return -EOPNOTSUPP; |
| } |
| |
| static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| struct sock *sk = (struct sock *)msk; |
| struct socket *ssock; |
| int ret = -EINVAL; |
| struct sock *ssk; |
| |
| lock_sock(sk); |
| ssk = msk->first; |
| if (ssk) { |
| ret = tcp_getsockopt(ssk, level, optname, optval, optlen); |
| goto out; |
| } |
| |
| ssock = __mptcp_nmpc_socket(msk); |
| if (!ssock) |
| goto out; |
| |
| ret = tcp_getsockopt(ssock->sk, level, optname, optval, optlen); |
| |
| out: |
| release_sock(sk); |
| return ret; |
| } |
| |
| void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info) |
| { |
| u32 flags = 0; |
| u8 val; |
| |
| memset(info, 0, sizeof(*info)); |
| |
| info->mptcpi_subflows = READ_ONCE(msk->pm.subflows); |
| info->mptcpi_add_addr_signal = READ_ONCE(msk->pm.add_addr_signaled); |
| info->mptcpi_add_addr_accepted = READ_ONCE(msk->pm.add_addr_accepted); |
| info->mptcpi_local_addr_used = READ_ONCE(msk->pm.local_addr_used); |
| info->mptcpi_subflows_max = mptcp_pm_get_subflows_max(msk); |
| val = mptcp_pm_get_add_addr_signal_max(msk); |
| info->mptcpi_add_addr_signal_max = val; |
| val = mptcp_pm_get_add_addr_accept_max(msk); |
| info->mptcpi_add_addr_accepted_max = val; |
| info->mptcpi_local_addr_max = mptcp_pm_get_local_addr_max(msk); |
| if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) |
| flags |= MPTCP_INFO_FLAG_FALLBACK; |
| if (READ_ONCE(msk->can_ack)) |
| flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED; |
| info->mptcpi_flags = flags; |
| info->mptcpi_token = READ_ONCE(msk->token); |
| info->mptcpi_write_seq = READ_ONCE(msk->write_seq); |
| info->mptcpi_snd_una = READ_ONCE(msk->snd_una); |
| info->mptcpi_rcv_nxt = READ_ONCE(msk->ack_seq); |
| info->mptcpi_csum_enabled = READ_ONCE(msk->csum_enabled); |
| } |
| EXPORT_SYMBOL_GPL(mptcp_diag_fill_info); |
| |
| static int mptcp_getsockopt_info(struct mptcp_sock *msk, char __user *optval, int __user *optlen) |
| { |
| struct mptcp_info m_info; |
| int len; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| |
| len = min_t(unsigned int, len, sizeof(struct mptcp_info)); |
| |
| mptcp_diag_fill_info(msk, &m_info); |
| |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| |
| if (copy_to_user(optval, &m_info, len)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static int mptcp_put_subflow_data(struct mptcp_subflow_data *sfd, |
| char __user *optval, |
| u32 copied, |
| int __user *optlen) |
| { |
| u32 copylen = min_t(u32, sfd->size_subflow_data, sizeof(*sfd)); |
| |
| if (copied) |
| copied += sfd->size_subflow_data; |
| else |
| copied = copylen; |
| |
| if (put_user(copied, optlen)) |
| return -EFAULT; |
| |
| if (copy_to_user(optval, sfd, copylen)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static int mptcp_get_subflow_data(struct mptcp_subflow_data *sfd, |
| char __user *optval, int __user *optlen) |
| { |
| int len, copylen; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| |
| /* if mptcp_subflow_data size is changed, need to adjust |
| * this function to deal with programs using old version. |
| */ |
| BUILD_BUG_ON(sizeof(*sfd) != MIN_INFO_OPTLEN_SIZE); |
| |
| if (len < MIN_INFO_OPTLEN_SIZE) |
| return -EINVAL; |
| |
| memset(sfd, 0, sizeof(*sfd)); |
| |
| copylen = min_t(unsigned int, len, sizeof(*sfd)); |
| if (copy_from_user(sfd, optval, copylen)) |
| return -EFAULT; |
| |
| /* size_subflow_data is u32, but len is signed */ |
| if (sfd->size_subflow_data > INT_MAX || |
| sfd->size_user > INT_MAX) |
| return -EINVAL; |
| |
| if (sfd->size_subflow_data < MIN_INFO_OPTLEN_SIZE || |
| sfd->size_subflow_data > len) |
| return -EINVAL; |
| |
| if (sfd->num_subflows || sfd->size_kernel) |
| return -EINVAL; |
| |
| return len - sfd->size_subflow_data; |
| } |
| |
| static int mptcp_getsockopt_tcpinfo(struct mptcp_sock *msk, char __user *optval, |
| int __user *optlen) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct sock *sk = (struct sock *)msk; |
| unsigned int sfcount = 0, copied = 0; |
| struct mptcp_subflow_data sfd; |
| char __user *infoptr; |
| int len; |
| |
| len = mptcp_get_subflow_data(&sfd, optval, optlen); |
| if (len < 0) |
| return len; |
| |
| sfd.size_kernel = sizeof(struct tcp_info); |
| sfd.size_user = min_t(unsigned int, sfd.size_user, |
| sizeof(struct tcp_info)); |
| |
| infoptr = optval + sfd.size_subflow_data; |
| |
| lock_sock(sk); |
| |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| |
| ++sfcount; |
| |
| if (len && len >= sfd.size_user) { |
| struct tcp_info info; |
| |
| tcp_get_info(ssk, &info); |
| |
| if (copy_to_user(infoptr, &info, sfd.size_user)) { |
| release_sock(sk); |
| return -EFAULT; |
| } |
| |
| infoptr += sfd.size_user; |
| copied += sfd.size_user; |
| len -= sfd.size_user; |
| } |
| } |
| |
| release_sock(sk); |
| |
| sfd.num_subflows = sfcount; |
| |
| if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static void mptcp_get_sub_addrs(const struct sock *sk, struct mptcp_subflow_addrs *a) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| |
| memset(a, 0, sizeof(*a)); |
| |
| if (sk->sk_family == AF_INET) { |
| a->sin_local.sin_family = AF_INET; |
| a->sin_local.sin_port = inet->inet_sport; |
| a->sin_local.sin_addr.s_addr = inet->inet_rcv_saddr; |
| |
| if (!a->sin_local.sin_addr.s_addr) |
| a->sin_local.sin_addr.s_addr = inet->inet_saddr; |
| |
| a->sin_remote.sin_family = AF_INET; |
| a->sin_remote.sin_port = inet->inet_dport; |
| a->sin_remote.sin_addr.s_addr = inet->inet_daddr; |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else if (sk->sk_family == AF_INET6) { |
| const struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| if (WARN_ON_ONCE(!np)) |
| return; |
| |
| a->sin6_local.sin6_family = AF_INET6; |
| a->sin6_local.sin6_port = inet->inet_sport; |
| |
| if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
| a->sin6_local.sin6_addr = np->saddr; |
| else |
| a->sin6_local.sin6_addr = sk->sk_v6_rcv_saddr; |
| |
| a->sin6_remote.sin6_family = AF_INET6; |
| a->sin6_remote.sin6_port = inet->inet_dport; |
| a->sin6_remote.sin6_addr = sk->sk_v6_daddr; |
| #endif |
| } |
| } |
| |
| static int mptcp_getsockopt_subflow_addrs(struct mptcp_sock *msk, char __user *optval, |
| int __user *optlen) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct sock *sk = (struct sock *)msk; |
| unsigned int sfcount = 0, copied = 0; |
| struct mptcp_subflow_data sfd; |
| char __user *addrptr; |
| int len; |
| |
| len = mptcp_get_subflow_data(&sfd, optval, optlen); |
| if (len < 0) |
| return len; |
| |
| sfd.size_kernel = sizeof(struct mptcp_subflow_addrs); |
| sfd.size_user = min_t(unsigned int, sfd.size_user, |
| sizeof(struct mptcp_subflow_addrs)); |
| |
| addrptr = optval + sfd.size_subflow_data; |
| |
| lock_sock(sk); |
| |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| |
| ++sfcount; |
| |
| if (len && len >= sfd.size_user) { |
| struct mptcp_subflow_addrs a; |
| |
| mptcp_get_sub_addrs(ssk, &a); |
| |
| if (copy_to_user(addrptr, &a, sfd.size_user)) { |
| release_sock(sk); |
| return -EFAULT; |
| } |
| |
| addrptr += sfd.size_user; |
| copied += sfd.size_user; |
| len -= sfd.size_user; |
| } |
| } |
| |
| release_sock(sk); |
| |
| sfd.num_subflows = sfcount; |
| |
| if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static int mptcp_put_int_option(struct mptcp_sock *msk, char __user *optval, |
| int __user *optlen, int val) |
| { |
| int len; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| if (len < 0) |
| return -EINVAL; |
| |
| if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
| unsigned char ucval = (unsigned char)val; |
| |
| len = 1; |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, &ucval, 1)) |
| return -EFAULT; |
| } else { |
| len = min_t(unsigned int, len, sizeof(int)); |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, &val, len)) |
| return -EFAULT; |
| } |
| |
| return 0; |
| } |
| |
| static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| switch (optname) { |
| case TCP_ULP: |
| case TCP_CONGESTION: |
| case TCP_INFO: |
| case TCP_CC_INFO: |
| case TCP_DEFER_ACCEPT: |
| case TCP_FASTOPEN: |
| case TCP_FASTOPEN_CONNECT: |
| case TCP_FASTOPEN_KEY: |
| case TCP_FASTOPEN_NO_COOKIE: |
| return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname, |
| optval, optlen); |
| case TCP_INQ: |
| return mptcp_put_int_option(msk, optval, optlen, msk->recvmsg_inq); |
| case TCP_CORK: |
| return mptcp_put_int_option(msk, optval, optlen, msk->cork); |
| case TCP_NODELAY: |
| return mptcp_put_int_option(msk, optval, optlen, msk->nodelay); |
| } |
| return -EOPNOTSUPP; |
| } |
| |
| static int mptcp_getsockopt_v4(struct mptcp_sock *msk, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| struct sock *sk = (void *)msk; |
| |
| switch (optname) { |
| case IP_TOS: |
| return mptcp_put_int_option(msk, optval, optlen, inet_sk(sk)->tos); |
| } |
| |
| return -EOPNOTSUPP; |
| } |
| |
| static int mptcp_getsockopt_sol_mptcp(struct mptcp_sock *msk, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| switch (optname) { |
| case MPTCP_INFO: |
| return mptcp_getsockopt_info(msk, optval, optlen); |
| case MPTCP_TCPINFO: |
| return mptcp_getsockopt_tcpinfo(msk, optval, optlen); |
| case MPTCP_SUBFLOW_ADDRS: |
| return mptcp_getsockopt_subflow_addrs(msk, optval, optlen); |
| } |
| |
| return -EOPNOTSUPP; |
| } |
| |
| int mptcp_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *option) |
| { |
| struct mptcp_sock *msk = mptcp_sk(sk); |
| struct sock *ssk; |
| |
| pr_debug("msk=%p", msk); |
| |
| /* @@ the meaning of setsockopt() when the socket is connected and |
| * there are multiple subflows is not yet defined. It is up to the |
| * MPTCP-level socket to configure the subflows until the subflow |
| * is in TCP fallback, when socket options are passed through |
| * to the one remaining subflow. |
| */ |
| lock_sock(sk); |
| ssk = __mptcp_tcp_fallback(msk); |
| release_sock(sk); |
| if (ssk) |
| return tcp_getsockopt(ssk, level, optname, optval, option); |
| |
| if (level == SOL_IP) |
| return mptcp_getsockopt_v4(msk, optname, optval, option); |
| if (level == SOL_TCP) |
| return mptcp_getsockopt_sol_tcp(msk, optname, optval, option); |
| if (level == SOL_MPTCP) |
| return mptcp_getsockopt_sol_mptcp(msk, optname, optval, option); |
| return -EOPNOTSUPP; |
| } |
| |
| static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk) |
| { |
| static const unsigned int tx_rx_locks = SOCK_RCVBUF_LOCK | SOCK_SNDBUF_LOCK; |
| struct sock *sk = (struct sock *)msk; |
| |
| if (ssk->sk_prot->keepalive) { |
| if (sock_flag(sk, SOCK_KEEPOPEN)) |
| ssk->sk_prot->keepalive(ssk, 1); |
| else |
| ssk->sk_prot->keepalive(ssk, 0); |
| } |
| |
| ssk->sk_priority = sk->sk_priority; |
| ssk->sk_bound_dev_if = sk->sk_bound_dev_if; |
| ssk->sk_incoming_cpu = sk->sk_incoming_cpu; |
| __ip_sock_set_tos(ssk, inet_sk(sk)->tos); |
| |
| if (sk->sk_userlocks & tx_rx_locks) { |
| ssk->sk_userlocks |= sk->sk_userlocks & tx_rx_locks; |
| if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) |
| WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); |
| if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) |
| WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); |
| } |
| |
| if (sock_flag(sk, SOCK_LINGER)) { |
| ssk->sk_lingertime = sk->sk_lingertime; |
| sock_set_flag(ssk, SOCK_LINGER); |
| } else { |
| sock_reset_flag(ssk, SOCK_LINGER); |
| } |
| |
| if (sk->sk_mark != ssk->sk_mark) { |
| ssk->sk_mark = sk->sk_mark; |
| sk_dst_reset(ssk); |
| } |
| |
| sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG)); |
| |
| if (inet_csk(sk)->icsk_ca_ops != inet_csk(ssk)->icsk_ca_ops) |
| tcp_set_congestion_control(ssk, msk->ca_name, false, true); |
| __tcp_sock_set_cork(ssk, !!msk->cork); |
| __tcp_sock_set_nodelay(ssk, !!msk->nodelay); |
| |
| inet_sk(ssk)->transparent = inet_sk(sk)->transparent; |
| inet_sk(ssk)->freebind = inet_sk(sk)->freebind; |
| } |
| |
| static void __mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk) |
| { |
| bool slow = lock_sock_fast(ssk); |
| |
| sync_socket_options(msk, ssk); |
| |
| unlock_sock_fast(ssk, slow); |
| } |
| |
| void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk) |
| { |
| struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
| |
| msk_owned_by_me(msk); |
| |
| if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { |
| __mptcp_sockopt_sync(msk, ssk); |
| |
| subflow->setsockopt_seq = msk->setsockopt_seq; |
| } |
| } |
| |
| void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk) |
| { |
| struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
| |
| msk_owned_by_me(msk); |
| |
| if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { |
| sync_socket_options(msk, ssk); |
| |
| subflow->setsockopt_seq = msk->setsockopt_seq; |
| } |
| } |