net: socket: add __sys_getsockname() helper; remove in-kernel call to…

… syscall Using the net-internal helper __sys_getsockname() allows us to avoid the internal calls to the sys_getsockname() 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/[email protected] Cc: David S. Miller <[email protected]> Cc: [email protected] Signed-off-by: Dominik Brodowski <[email protected]>
laijs · Apr 2, 2018 · 8882a10 · 8882a10
1 parent 25e290e
commit 8882a10
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Showing 3 changed files with 13 additions and 5 deletions.
diff --git a/include/linux/socket.h b/include/linux/socket.h
@@ -368,5 +368,7 @@ extern int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen);
 extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,
 			 int addrlen);
 extern int __sys_listen(int fd, int backlog);
+extern int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
+			     int __user *usockaddr_len);
 
 #endif /* _LINUX_SOCKET_H */
diff --git a/net/compat.c b/net/compat.c
@@ -826,7 +826,7 @@ COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 		ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 		break;
 	case SYS_GETSOCKNAME:
-		ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
+		ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 		break;
 	case SYS_GETPEERNAME:
 		ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));

diff --git a/net/socket.c b/net/socket.c
@@ -1675,8 +1675,8 @@ SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
  *	name to user space.
  */
 
-SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
-		int __user *, usockaddr_len)
+int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
+		      int __user *usockaddr_len)
 {
 	struct socket *sock;
 	struct sockaddr_storage address;
@@ -1701,6 +1701,12 @@ SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
 	return err;
 }
 
+SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
+		int __user *, usockaddr_len)
+{
+	return __sys_getsockname(fd, usockaddr, usockaddr_len);
+}
+
 /*
  *	Get the remote address ('name') of a socket object. Move the obtained
  *	name to user space.
@@ -2500,8 +2506,8 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
 		break;
 	case SYS_GETSOCKNAME:
 		err =
-		    sys_getsockname(a0, (struct sockaddr __user *)a1,
-				    (int __user *)a[2]);
+		    __sys_getsockname(a0, (struct sockaddr __user *)a1,
+				      (int __user *)a[2]);
 		break;
 	case SYS_GETPEERNAME:
 		err =