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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-13 20:10:59 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 20:15:13 +0200
commitcc36dca0dffad991135d0e28938ba2b4c0b786f7 (patch)
treeb7f84be350317173671009956e3dc4a67897cfda
parent005a1aeac46666e2805f316596893ebd2a3c12e7 (diff)
downloadlinux-cc36dca0dffad991135d0e28938ba2b4c0b786f7.tar.bz2
net: socket: add __sys_setsockopt() helper; remove in-kernel call to syscall
Using the net-internal helper __sys_setsockopt() allows us to avoid the internal calls to the sys_setsockopt() syscall. This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: David S. Miller <davem@davemloft.net> Cc: netdev@vger.kernel.org Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
-rw-r--r--include/linux/socket.h1
-rw-r--r--net/socket.c13
2 files changed, 11 insertions, 3 deletions
diff --git a/include/linux/socket.h b/include/linux/socket.h
index b205138b69f1..cad120e4ed4b 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -376,4 +376,5 @@ extern int __sys_socketpair(int family, int type, int protocol,
int __user *usockvec);
extern int __sys_shutdown(int fd, int how);
+
#endif /* _LINUX_SOCKET_H */
diff --git a/net/socket.c b/net/socket.c
index ad5dfd6a1d59..5dd2e39a6cd4 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1878,8 +1878,8 @@ SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
* to pass the user mode parameter for the protocols to sort out.
*/
-SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
- char __user *, optval, int, optlen)
+static int __sys_setsockopt(int fd, int level, int optname,
+ char __user *optval, int optlen)
{
int err, fput_needed;
struct socket *sock;
@@ -1907,6 +1907,12 @@ out_put:
return err;
}
+SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
+ char __user *, optval, int, optlen)
+{
+ return __sys_setsockopt(fd, level, optname, optval, optlen);
+}
+
/*
* Get a socket option. Because we don't know the option lengths we have
* to pass a user mode parameter for the protocols to sort out.
@@ -2552,7 +2558,8 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
err = __sys_shutdown(a0, a1);
break;
case SYS_SETSOCKOPT:
- err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
+ err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
+ a[4]);
break;
case SYS_GETSOCKOPT:
err =