[PATCH 06/33] net: add sock_set_sndtimeo

Christoph Hellwig
2020-05-20T20:00:34Z

Add a helper to directly set the SO_SNDTIMEO_NEW sockopt from kernel
space without going through a fake uaccess. The interface is
simplified to only pass the seconds value, as that is the only
thing needed at the moment.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/dlm/lowcomms.c | 8 ++------
include/net/sock.h | 1 +
net/core/sock.c | 11 +++++++++++
3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 88f2574ca63ad..b79711d0aac72 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -918,7 +918,6 @@ static void sctp_connect_to_sock(struct connection *con)
int result;
int addr_len;
struct socket *sock;
- struct __kernel_sock_timeval tv = { .tv_sec = 5, .tv_usec = 0 };

if (con->nodeid == 0) {
log_print("attempt to connect sock 0 foiled");
@@ -970,13 +969,10 @@ static void sctp_connect_to_sock(struct connection *con)
* since O_NONBLOCK argument in connect() function does not work here,
* then, we should restore the default value of this attribute.
*/
- kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO_NEW, (char *)&tv,
- sizeof(tv));
+ sock_set_sndtimeo(sock->sk, 5);
result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len,
0);
- memset(&tv, 0, sizeof(tv));
- kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO_NEW, (char *)&tv,
- sizeof(tv));
+ sock_set_sndtimeo(sock->sk, 0);

if (result == -EINPROGRESS)
result = 0;
diff --git a/include/net/sock.h b/include/net/sock.h
index a3a43141a4be2..9a7b9e98685ac 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2691,5 +2691,6 @@ void sock_def_readable(struct sock *sk);
void sock_no_linger(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);

#endif /* _SOCK_H */
diff --git a/net/core/sock.c b/net/core/sock.c
index ceda1a9248b3e..d3b1d61e4f768 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -737,6 +737,17 @@ void sock_set_priority(struct sock *sk, u32 priority)
}
EXPORT_SYMBOL(sock_set_priority);

+void sock_set_sndtimeo(struct sock *sk, s64 secs)
+{
+ lock_sock(sk);
+ if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
+ sk->sk_sndtimeo = secs * HZ;
+ else
+ sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
+ release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_sndtimeo);
+
/*
* This is meant for all protocols to use and covers goings on
* at the socket level. Everything here is generic.
--
2.26.2