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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-13 19:29:43 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 20:15:06 +0200
commit9d6a15c3f23bcf0b0e6c6efd7d19f52d960a8697 (patch)
tree3f262176da84ad01c7f71318a9426f6045d1d941
parent4541e80560ca56d63348f40f2e34b044a5eb3dd7 (diff)
net: socket: add __sys_socket() helper; remove in-kernel call to syscall
Using the net-internal helper __sys_socket() allows us to avoid the internal calls to the sys_socket() 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/compat.c2
-rw-r--r--net/socket.c9
3 files changed, 9 insertions, 3 deletions
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 6a9840271676..f8d040434a13 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -363,5 +363,6 @@ extern int __sys_sendto(int fd, void __user *buff, size_t len,
int addr_len);
extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
int __user *upeer_addrlen, int flags);
+extern int __sys_socket(int family, int type, int protocol);
#endif /* _LINUX_SOCKET_H */
diff --git a/net/compat.c b/net/compat.c
index 0ff9f7451b6f..5b3b74c5812e 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -811,7 +811,7 @@ COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
switch (call) {
case SYS_SOCKET:
- ret = sys_socket(a0, a1, a[2]);
+ ret = __sys_socket(a0, a1, a[2]);
break;
case SYS_BIND:
ret = sys_bind(a0, compat_ptr(a1), a[2]);
diff --git a/net/socket.c b/net/socket.c
index 45f6ea0d57a5..07f379e50def 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1332,7 +1332,7 @@ int sock_create_kern(struct net *net, int family, int type, int protocol, struct
}
EXPORT_SYMBOL(sock_create_kern);
-SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
+int __sys_socket(int family, int type, int protocol)
{
int retval;
struct socket *sock;
@@ -1359,6 +1359,11 @@ SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
}
+SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
+{
+ return __sys_socket(family, type, protocol);
+}
+
/*
* Create a pair of connected sockets.
*/
@@ -2463,7 +2468,7 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
switch (call) {
case SYS_SOCKET:
- err = sys_socket(a0, a1, a[2]);
+ err = __sys_socket(a0, a1, a[2]);
break;
case SYS_BIND:
err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);