766 строки
19 KiB
C
766 строки
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Multipath TCP
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*
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* Copyright (c) 2021, Red Hat.
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*/
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#define pr_fmt(fmt) "MPTCP: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <net/sock.h>
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#include <net/protocol.h>
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#include <net/tcp.h>
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#include <net/mptcp.h>
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#include "protocol.h"
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static struct sock *__mptcp_tcp_fallback(struct mptcp_sock *msk)
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{
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sock_owned_by_me((const struct sock *)msk);
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if (likely(!__mptcp_check_fallback(msk)))
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return NULL;
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return msk->first;
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}
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static u32 sockopt_seq_reset(const struct sock *sk)
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{
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sock_owned_by_me(sk);
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/* Highbits contain state. Allows to distinguish sockopt_seq
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* of listener and established:
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* s0 = new_listener()
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* sockopt(s0) - seq is 1
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* s1 = accept(s0) - s1 inherits seq 1 if listener sk (s0)
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* sockopt(s0) - seq increments to 2 on s0
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* sockopt(s1) // seq increments to 2 on s1 (different option)
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* new ssk completes join, inherits options from s0 // seq 2
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* Needs sync from mptcp join logic, but ssk->seq == msk->seq
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*
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* Set High order bits to sk_state so ssk->seq == msk->seq test
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* will fail.
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*/
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return (u32)sk->sk_state << 24u;
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}
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static void sockopt_seq_inc(struct mptcp_sock *msk)
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{
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u32 seq = (msk->setsockopt_seq + 1) & 0x00ffffff;
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msk->setsockopt_seq = sockopt_seq_reset((struct sock *)msk) + seq;
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}
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static int mptcp_get_int_option(struct mptcp_sock *msk, sockptr_t optval,
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unsigned int optlen, int *val)
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{
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if (optlen < sizeof(int))
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return -EINVAL;
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if (copy_from_sockptr(val, optval, sizeof(*val)))
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return -EFAULT;
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return 0;
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}
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static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, int val)
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{
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struct mptcp_subflow_context *subflow;
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struct sock *sk = (struct sock *)msk;
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lock_sock(sk);
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sockopt_seq_inc(msk);
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mptcp_for_each_subflow(msk, subflow) {
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struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
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bool slow = lock_sock_fast(ssk);
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switch (optname) {
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case SO_DEBUG:
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sock_valbool_flag(ssk, SOCK_DBG, !!val);
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break;
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case SO_KEEPALIVE:
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if (ssk->sk_prot->keepalive)
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ssk->sk_prot->keepalive(ssk, !!val);
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sock_valbool_flag(ssk, SOCK_KEEPOPEN, !!val);
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break;
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case SO_PRIORITY:
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ssk->sk_priority = val;
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break;
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case SO_SNDBUF:
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case SO_SNDBUFFORCE:
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ssk->sk_userlocks |= SOCK_SNDBUF_LOCK;
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WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf);
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break;
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case SO_RCVBUF:
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case SO_RCVBUFFORCE:
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ssk->sk_userlocks |= SOCK_RCVBUF_LOCK;
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WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf);
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break;
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case SO_MARK:
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if (READ_ONCE(ssk->sk_mark) != sk->sk_mark) {
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ssk->sk_mark = sk->sk_mark;
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sk_dst_reset(ssk);
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}
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break;
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case SO_INCOMING_CPU:
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WRITE_ONCE(ssk->sk_incoming_cpu, val);
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break;
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}
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subflow->setsockopt_seq = msk->setsockopt_seq;
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unlock_sock_fast(ssk, slow);
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}
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release_sock(sk);
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}
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static int mptcp_sol_socket_intval(struct mptcp_sock *msk, int optname, int val)
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{
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sockptr_t optval = KERNEL_SOCKPTR(&val);
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struct sock *sk = (struct sock *)msk;
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int ret;
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ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
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optval, sizeof(val));
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if (ret)
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return ret;
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mptcp_sol_socket_sync_intval(msk, optname, val);
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return 0;
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}
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static void mptcp_so_incoming_cpu(struct mptcp_sock *msk, int val)
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{
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struct sock *sk = (struct sock *)msk;
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WRITE_ONCE(sk->sk_incoming_cpu, val);
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mptcp_sol_socket_sync_intval(msk, SO_INCOMING_CPU, val);
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}
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static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optname, int val)
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{
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sockptr_t optval = KERNEL_SOCKPTR(&val);
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struct mptcp_subflow_context *subflow;
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struct sock *sk = (struct sock *)msk;
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int ret;
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ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
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optval, sizeof(val));
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if (ret)
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return ret;
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lock_sock(sk);
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mptcp_for_each_subflow(msk, subflow) {
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struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
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bool slow = lock_sock_fast(ssk);
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switch (optname) {
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case SO_TIMESTAMP_OLD:
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case SO_TIMESTAMP_NEW:
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case SO_TIMESTAMPNS_OLD:
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case SO_TIMESTAMPNS_NEW:
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sock_set_timestamp(sk, optname, !!val);
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break;
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case SO_TIMESTAMPING_NEW:
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case SO_TIMESTAMPING_OLD:
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sock_set_timestamping(sk, optname, val);
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break;
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}
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unlock_sock_fast(ssk, slow);
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}
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release_sock(sk);
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return 0;
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}
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static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname,
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sockptr_t optval, unsigned int optlen)
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{
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int val, ret;
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ret = mptcp_get_int_option(msk, optval, optlen, &val);
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if (ret)
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return ret;
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switch (optname) {
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case SO_KEEPALIVE:
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mptcp_sol_socket_sync_intval(msk, optname, val);
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return 0;
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case SO_DEBUG:
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case SO_MARK:
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case SO_PRIORITY:
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case SO_SNDBUF:
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case SO_SNDBUFFORCE:
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case SO_RCVBUF:
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case SO_RCVBUFFORCE:
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return mptcp_sol_socket_intval(msk, optname, val);
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case SO_INCOMING_CPU:
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mptcp_so_incoming_cpu(msk, val);
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return 0;
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case SO_TIMESTAMP_OLD:
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case SO_TIMESTAMP_NEW:
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case SO_TIMESTAMPNS_OLD:
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case SO_TIMESTAMPNS_NEW:
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case SO_TIMESTAMPING_OLD:
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case SO_TIMESTAMPING_NEW:
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return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val);
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}
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return -ENOPROTOOPT;
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}
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static int mptcp_setsockopt_sol_socket_linger(struct mptcp_sock *msk, sockptr_t optval,
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unsigned int optlen)
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{
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struct mptcp_subflow_context *subflow;
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struct sock *sk = (struct sock *)msk;
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struct linger ling;
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sockptr_t kopt;
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int ret;
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if (optlen < sizeof(ling))
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return -EINVAL;
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if (copy_from_sockptr(&ling, optval, sizeof(ling)))
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return -EFAULT;
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kopt = KERNEL_SOCKPTR(&ling);
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ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, SO_LINGER, kopt, sizeof(ling));
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if (ret)
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return ret;
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lock_sock(sk);
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sockopt_seq_inc(msk);
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mptcp_for_each_subflow(msk, subflow) {
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struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
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bool slow = lock_sock_fast(ssk);
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if (!ling.l_onoff) {
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sock_reset_flag(ssk, SOCK_LINGER);
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} else {
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ssk->sk_lingertime = sk->sk_lingertime;
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sock_set_flag(ssk, SOCK_LINGER);
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}
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subflow->setsockopt_seq = msk->setsockopt_seq;
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unlock_sock_fast(ssk, slow);
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}
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release_sock(sk);
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return 0;
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}
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static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
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sockptr_t optval, unsigned int optlen)
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{
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struct sock *sk = (struct sock *)msk;
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struct socket *ssock;
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int ret;
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switch (optname) {
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case SO_REUSEPORT:
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case SO_REUSEADDR:
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case SO_BINDTODEVICE:
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case SO_BINDTOIFINDEX:
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lock_sock(sk);
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ssock = __mptcp_nmpc_socket(msk);
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if (!ssock) {
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release_sock(sk);
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return -EINVAL;
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}
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ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen);
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if (ret == 0) {
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if (optname == SO_REUSEPORT)
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sk->sk_reuseport = ssock->sk->sk_reuseport;
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else if (optname == SO_REUSEADDR)
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sk->sk_reuse = ssock->sk->sk_reuse;
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else if (optname == SO_BINDTODEVICE)
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sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if;
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else if (optname == SO_BINDTOIFINDEX)
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sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if;
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}
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release_sock(sk);
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return ret;
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case SO_KEEPALIVE:
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case SO_PRIORITY:
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case SO_SNDBUF:
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case SO_SNDBUFFORCE:
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case SO_RCVBUF:
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case SO_RCVBUFFORCE:
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case SO_MARK:
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case SO_INCOMING_CPU:
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case SO_DEBUG:
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case SO_TIMESTAMP_OLD:
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case SO_TIMESTAMP_NEW:
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case SO_TIMESTAMPNS_OLD:
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case SO_TIMESTAMPNS_NEW:
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case SO_TIMESTAMPING_OLD:
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case SO_TIMESTAMPING_NEW:
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return mptcp_setsockopt_sol_socket_int(msk, optname, optval, optlen);
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case SO_LINGER:
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return mptcp_setsockopt_sol_socket_linger(msk, optval, optlen);
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case SO_RCVLOWAT:
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case SO_RCVTIMEO_OLD:
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case SO_RCVTIMEO_NEW:
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case SO_BUSY_POLL:
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case SO_PREFER_BUSY_POLL:
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case SO_BUSY_POLL_BUDGET:
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/* No need to copy: only relevant for msk */
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return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen);
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case SO_NO_CHECK:
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case SO_DONTROUTE:
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case SO_BROADCAST:
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case SO_BSDCOMPAT:
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case SO_PASSCRED:
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case SO_PASSSEC:
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case SO_RXQ_OVFL:
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case SO_WIFI_STATUS:
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case SO_NOFCS:
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case SO_SELECT_ERR_QUEUE:
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return 0;
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}
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/* SO_OOBINLINE is not supported, let's avoid the related mess
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* SO_ATTACH_FILTER, SO_ATTACH_BPF, SO_ATTACH_REUSEPORT_CBPF,
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* SO_DETACH_REUSEPORT_BPF, SO_DETACH_FILTER, SO_LOCK_FILTER,
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* we must be careful with subflows
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*
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* SO_ATTACH_REUSEPORT_EBPF is not supported, at it checks
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* explicitly the sk_protocol field
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*
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* SO_PEEK_OFF is unsupported, as it is for plain TCP
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* SO_MAX_PACING_RATE is unsupported, we must be careful with subflows
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* SO_CNX_ADVICE is currently unsupported, could possibly be relevant,
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* but likely needs careful design
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*
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* SO_ZEROCOPY is currently unsupported, TODO in sndmsg
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* SO_TXTIME is currently unsupported
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*/
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return -EOPNOTSUPP;
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}
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static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,
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sockptr_t optval, unsigned int optlen)
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{
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struct sock *sk = (struct sock *)msk;
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int ret = -EOPNOTSUPP;
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struct socket *ssock;
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switch (optname) {
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case IPV6_V6ONLY:
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lock_sock(sk);
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ssock = __mptcp_nmpc_socket(msk);
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if (!ssock) {
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release_sock(sk);
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return -EINVAL;
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}
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ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen);
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if (ret == 0)
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sk->sk_ipv6only = ssock->sk->sk_ipv6only;
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release_sock(sk);
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break;
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}
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return ret;
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}
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static bool mptcp_supported_sockopt(int level, int optname)
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{
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if (level == SOL_IP) {
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switch (optname) {
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/* should work fine */
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case IP_FREEBIND:
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case IP_TRANSPARENT:
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/* the following are control cmsg related */
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case IP_PKTINFO:
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case IP_RECVTTL:
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case IP_RECVTOS:
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case IP_RECVOPTS:
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case IP_RETOPTS:
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case IP_PASSSEC:
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case IP_RECVORIGDSTADDR:
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case IP_CHECKSUM:
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case IP_RECVFRAGSIZE:
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/* common stuff that need some love */
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case IP_TOS:
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case IP_TTL:
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case IP_BIND_ADDRESS_NO_PORT:
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case IP_MTU_DISCOVER:
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case IP_RECVERR:
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/* possibly less common may deserve some love */
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case IP_MINTTL:
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/* the following is apparently a no-op for plain TCP */
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case IP_RECVERR_RFC4884:
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return true;
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}
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/* IP_OPTIONS is not supported, needs subflow care */
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/* IP_HDRINCL, IP_NODEFRAG are not supported, RAW specific */
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/* IP_MULTICAST_TTL, IP_MULTICAST_LOOP, IP_UNICAST_IF,
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* IP_ADD_MEMBERSHIP, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP,
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* IP_DROP_SOURCE_MEMBERSHIP, IP_BLOCK_SOURCE, IP_UNBLOCK_SOURCE,
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* MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP MCAST_JOIN_SOURCE_GROUP,
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* MCAST_LEAVE_SOURCE_GROUP, MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE,
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* MCAST_MSFILTER, IP_MULTICAST_ALL are not supported, better not deal
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* with mcast stuff
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*/
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/* IP_IPSEC_POLICY, IP_XFRM_POLICY are nut supported, unrelated here */
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return false;
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}
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if (level == SOL_IPV6) {
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switch (optname) {
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case IPV6_V6ONLY:
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/* the following are control cmsg related */
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case IPV6_RECVPKTINFO:
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case IPV6_2292PKTINFO:
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case IPV6_RECVHOPLIMIT:
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case IPV6_2292HOPLIMIT:
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case IPV6_RECVRTHDR:
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case IPV6_2292RTHDR:
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case IPV6_RECVHOPOPTS:
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case IPV6_2292HOPOPTS:
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case IPV6_RECVDSTOPTS:
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case IPV6_2292DSTOPTS:
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case IPV6_RECVTCLASS:
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case IPV6_FLOWINFO:
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case IPV6_RECVPATHMTU:
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case IPV6_RECVORIGDSTADDR:
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case IPV6_RECVFRAGSIZE:
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/* the following ones need some love but are quite common */
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case IPV6_TCLASS:
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case IPV6_TRANSPARENT:
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case IPV6_FREEBIND:
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case IPV6_PKTINFO:
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case IPV6_2292PKTOPTIONS:
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case IPV6_UNICAST_HOPS:
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case IPV6_MTU_DISCOVER:
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case IPV6_MTU:
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case IPV6_RECVERR:
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case IPV6_FLOWINFO_SEND:
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case IPV6_FLOWLABEL_MGR:
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case IPV6_MINHOPCOUNT:
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case IPV6_DONTFRAG:
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case IPV6_AUTOFLOWLABEL:
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/* the following one is a no-op for plain TCP */
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case IPV6_RECVERR_RFC4884:
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return true;
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}
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/* IPV6_HOPOPTS, IPV6_RTHDRDSTOPTS, IPV6_RTHDR, IPV6_DSTOPTS are
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* not supported
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*/
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/* IPV6_MULTICAST_HOPS, IPV6_MULTICAST_LOOP, IPV6_UNICAST_IF,
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* IPV6_MULTICAST_IF, IPV6_ADDRFORM,
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* IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
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* IPV6_LEAVE_ANYCAST, IPV6_MULTICAST_ALL, MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP,
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* MCAST_JOIN_SOURCE_GROUP, MCAST_LEAVE_SOURCE_GROUP,
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* MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, MCAST_MSFILTER
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* are not supported better not deal with mcast
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*/
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/* IPV6_ROUTER_ALERT, IPV6_ROUTER_ALERT_ISOLATE are not supported, since are evil */
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/* IPV6_IPSEC_POLICY, IPV6_XFRM_POLICY are not supported */
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/* IPV6_ADDR_PREFERENCES is not supported, we must be careful with subflows */
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return false;
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}
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if (level == SOL_TCP) {
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switch (optname) {
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/* the following are no-op or should work just fine */
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case TCP_THIN_DUPACK:
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case TCP_DEFER_ACCEPT:
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/* the following need some love */
|
|
case TCP_MAXSEG:
|
|
case TCP_NODELAY:
|
|
case TCP_THIN_LINEAR_TIMEOUTS:
|
|
case TCP_CONGESTION:
|
|
case TCP_ULP:
|
|
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:
|
|
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
|
|
*/
|
|
/* TCP_FASTOPEN_KEY, TCP_FASTOPEN TCP_FASTOPEN_CONNECT, TCP_FASTOPEN_NO_COOKIE,
|
|
* are not supported fastopen is currently unsupported
|
|
*/
|
|
/* TCP_INQ is currently unsupported, needs some recvmsg work */
|
|
}
|
|
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(struct mptcp_sock *msk, int optname,
|
|
sockptr_t optval, unsigned int optlen)
|
|
{
|
|
switch (optname) {
|
|
case TCP_ULP:
|
|
return -EOPNOTSUPP;
|
|
case TCP_CONGESTION:
|
|
return mptcp_setsockopt_sol_tcp_congestion(msk, 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_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;
|
|
}
|
|
|
|
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:
|
|
return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname,
|
|
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_TCP)
|
|
return mptcp_getsockopt_sol_tcp(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;
|
|
|
|
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);
|
|
}
|
|
|
|
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_all(struct mptcp_sock *msk)
|
|
{
|
|
struct mptcp_subflow_context *subflow;
|
|
struct sock *sk = (struct sock *)msk;
|
|
u32 seq;
|
|
|
|
seq = sockopt_seq_reset(sk);
|
|
|
|
mptcp_for_each_subflow(msk, subflow) {
|
|
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
|
|
u32 sseq = READ_ONCE(subflow->setsockopt_seq);
|
|
|
|
if (sseq != msk->setsockopt_seq) {
|
|
__mptcp_sockopt_sync(msk, ssk);
|
|
WRITE_ONCE(subflow->setsockopt_seq, seq);
|
|
} else if (sseq != seq) {
|
|
WRITE_ONCE(subflow->setsockopt_seq, seq);
|
|
}
|
|
|
|
cond_resched();
|
|
}
|
|
|
|
msk->setsockopt_seq = seq;
|
|
}
|