net: socket: add __sys_accept4() helper; remove in-kernel call to syscall

Using the net-internal helper __sys_accept4() allows us to avoid the
internal calls to the sys_accept4() 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>

diff --git a/include/linux/socket.h b/include/linux/socket.h
index 54b85ab..6a98402 100644 (file)
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -361,5 +361,7 @@ extern int __sys_recvfrom(int fd, void __user *ubuf, size_t size,
 extern int __sys_sendto(int fd, void __user *buff, size_t len,
                        unsigned int flags, struct sockaddr __user *addr,
                        int addr_len);
+extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
+                        int __user *upeer_addrlen, int flags);
 
 #endif /* _LINUX_SOCKET_H */

diff --git a/net/compat.c b/net/compat.c
index fc82982..0ff9f74 100644 (file)
--- a/net/compat.c
+++ b/net/compat.c
@@ -823,7 +823,7 @@ COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
                ret = sys_listen(a0, a1);
                break;
        case SYS_ACCEPT:
-               ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
+               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]));
@@ -873,7 +873,7 @@ COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
                                          compat_ptr(a[4]));
                break;
        case SYS_ACCEPT4:
-               ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
+               ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
                break;
        default:
                ret = -EINVAL;

diff --git a/net/socket.c b/net/socket.c
index 3f037a2..45f6ea0 100644 (file)
--- a/net/socket.c
+++ b/net/socket.c
@@ -1519,8 +1519,8 @@ SYSCALL_DEFINE2(listen, int, fd, int, backlog)
  *     clean when we restucture accept also.
  */
 
-SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
-               int __user *, upeer_addrlen, int, flags)
+int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
+                 int __user *upeer_addrlen, int flags)
 {
        struct socket *sock, *newsock;
        struct file *newfile;
@@ -1599,10 +1599,16 @@ out_fd:
        goto out_put;
 }
 
+SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
+               int __user *, upeer_addrlen, int, flags)
+{
+       return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
+}
+
 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
                int __user *, upeer_addrlen)
 {
-       return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
+       return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
 }
 
 /*
@@ -2469,8 +2475,8 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
                err = sys_listen(a0, a1);
                break;
        case SYS_ACCEPT:
-               err = sys_accept4(a0, (struct sockaddr __user *)a1,
-                                 (int __user *)a[2], 0);
+               err = __sys_accept4(a0, (struct sockaddr __user *)a1,
+                                   (int __user *)a[2], 0);
                break;
        case SYS_GETSOCKNAME:
                err =
@@ -2525,8 +2531,8 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
                                   (struct timespec __user *)a[4]);
                break;
        case SYS_ACCEPT4:
-               err = sys_accept4(a0, (struct sockaddr __user *)a1,
-                                 (int __user *)a[2], a[3]);
+               err = __sys_accept4(a0, (struct sockaddr __user *)a1,
+                                   (int __user *)a[2], a[3]);
                break;
        default:
                err = -EINVAL;