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linux/net/mptcp/sockopt.c
Yangbo Lu d463126e23 net: sock: extend SO_TIMESTAMPING for PHC binding 
Since PTP virtual clock support is added, there can be
several PTP virtual clocks based on one PTP physical
clock for timestamping.

This patch is to extend SO_TIMESTAMPING API to support
PHC (PTP Hardware Clock) binding by adding a new flag
SOF_TIMESTAMPING_BIND_PHC. When PTP virtual clocks are
in use, user space can configure to bind one for
timestamping, but PTP physical clock is not supported
and not needed to bind.

This patch is preparation for timestamp conversion from
raw timestamp to a specific PTP virtual clock time in
core net.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-01 13:08:18 -07:00

800 lines
20 KiB
C
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// 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"
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(&timestamping, optval,
sizeof(timestamping)))
return -EFAULT;
} else if (optlen == sizeof(int)) {
memset(&timestamping, 0, sizeof(timestamping));
if (copy_from_sockptr(&timestamping.flags, optval, sizeof(int)))
return -EFAULT;
} else {
return -EINVAL;
}
ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
KERNEL_SOCKPTR(&timestamping),
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_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:
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)
sk->sk_ipv6only = ssock->sk->sk_ipv6only;
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_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;
}
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