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/20180325162527.ga17...@light.dominikbrodowski.net Cc: David S. Miller <da...@davemloft.net> Cc: netdev@vger.kernel.org Signed-off-by: Dominik Brodowski <li...@dominikbrodowski.net> --- include/linux/socket.h | 2 ++ net/compat.c | 2 +- net/socket.c | 14 ++++++++++---- 3 files changed, 13 insertions(+), 5 deletions(-) diff --git a/include/linux/socket.h b/include/linux/socket.h index 7e37af25509d..ef0226a61b03 100644 --- 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 index c80cb973f383..efd28d02608c 100644 --- 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 index 67d9d70a4734..b61e0d20f37b 100644 --- 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 = -- 2.16.3
