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799 lines
20 KiB
799 lines
20 KiB
// 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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|
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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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sock_set_timestamp(sk, optname, !!val); |
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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, |
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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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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_timestamping(struct mptcp_sock *msk, |
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int optname, |
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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 so_timestamping timestamping; |
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int ret; |
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if (optlen == sizeof(timestamping)) { |
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if (copy_from_sockptr(×tamping, optval, |
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sizeof(timestamping))) |
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return -EFAULT; |
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} else if (optlen == sizeof(int)) { |
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memset(×tamping, 0, sizeof(timestamping)); |
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if (copy_from_sockptr(×tamping.flags, optval, sizeof(int))) |
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return -EFAULT; |
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} else { |
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return -EINVAL; |
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} |
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ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, |
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KERNEL_SOCKPTR(×tamping), |
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sizeof(timestamping)); |
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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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sock_set_timestamping(sk, optname, timestamping); |
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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_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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return mptcp_setsockopt_sol_socket_int(msk, optname, optval, |
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optlen); |
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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_timestamping(msk, optname, |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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/* 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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|
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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; |
|
} |
|
if (level == SOL_TCP) { |
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switch (optname) { |
|
/* 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: |
|
|
|
/* the following need some love */ |
|
case TCP_MAXSEG: |
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case TCP_NODELAY: |
|
case TCP_THIN_LINEAR_TIMEOUTS: |
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case TCP_CONGESTION: |
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case TCP_ULP: |
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case TCP_CORK: |
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case TCP_KEEPIDLE: |
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case TCP_KEEPINTVL: |
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case TCP_KEEPCNT: |
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case TCP_SYNCNT: |
|
case TCP_SAVE_SYN: |
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case TCP_LINGER2: |
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case TCP_WINDOW_CLAMP: |
|
case TCP_QUICKACK: |
|
case TCP_USER_TIMEOUT: |
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case TCP_TIMESTAMP: |
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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; |
|
}
|
|
|