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net: add sock_set_keepalive

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Add a helper to directly set the SO_KEEPALIVE sockopt from kernel space
without going through a fake uaccess.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-05-28 07:12:15 +02:00 committed by David S. Miller
parent 783da70e83
commit ce3d9544ce
5 changed files with 14 additions and 13 deletions
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6
fs/dlm/lowcomms.c
View file

@ -1142,11 +1142,7 @@ static struct socket *tcp_create_listen_sock(struct connection *con,
con->sock = NULL;
goto create_out;
}
result = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
(char *)&one, sizeof(one));
if (result < 0) {
log_print("Set keepalive failed: %d", result);
}
sock_set_keepalive(sock->sk);
result = sock->ops->listen(sock, 5);
if (result < 0) {

1
include/net/sock.h
View file

@ -2691,6 +2691,7 @@ void sock_def_readable(struct sock *sk);
int sock_bindtoindex(struct sock *sk, int ifindex);
void sock_enable_timestamps(struct sock *sk);
void sock_no_linger(struct sock *sk);
void sock_set_keepalive(struct sock *sk);
void sock_set_priority(struct sock *sk, u32 priority);
void sock_set_reuseaddr(struct sock *sk);
void sock_set_sndtimeo(struct sock *sk, s64 secs);

10
net/core/sock.c
View file

@ -779,6 +779,16 @@ void sock_enable_timestamps(struct sock *sk)
}
EXPORT_SYMBOL(sock_enable_timestamps);
void sock_set_keepalive(struct sock *sk)
{
lock_sock(sk);
if (sk->sk_prot->keepalive)
sk->sk_prot->keepalive(sk, true);
sock_valbool_flag(sk, SOCK_KEEPOPEN, true);
release_sock(sk);
}
EXPORT_SYMBOL(sock_set_keepalive);
/*
* This is meant for all protocols to use and covers goings on
* at the socket level. Everything here is generic.

6
net/rds/tcp_listen.c
View file

@ -43,13 +43,9 @@ int rds_tcp_keepalive(struct socket *sock)
/* values below based on xs_udp_default_timeout */
int keepidle = 5; /* send a probe 'keepidle' secs after last data */
int keepcnt = 5; /* number of unack'ed probes before declaring dead */
int keepalive = 1;
int ret = 0;
ret = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
(char *)&keepalive, sizeof(keepalive));
if (ret < 0)
goto bail;
sock_set_keepalive(sock->sk);
ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT,
(char *)&keepcnt, sizeof(keepcnt));

4
net/sunrpc/xprtsock.c
View file

@ -2110,7 +2110,6 @@ static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
unsigned int keepidle;
unsigned int keepcnt;
unsigned int opt_on = 1;
unsigned int timeo;
spin_lock(&xprt->transport_lock);
@ -2122,8 +2121,7 @@ static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
spin_unlock(&xprt->transport_lock);
/* TCP Keepalive options */
kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
(char *)&opt_on, sizeof(opt_on));
sock_set_keepalive(sock->sk);
kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
(char *)&keepidle, sizeof(keepidle));
kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,