Using the net-internal helper __sys_bind() allows us to avoid the internal calls to the sys_bind() 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 | 1 + net/compat.c | 2 +- net/socket.c | 9 +++++++-- 3 files changed, 9 insertions(+), 3 deletions(-) diff --git a/include/linux/socket.h b/include/linux/socket.h index f8d040434a13..e9cee272da13 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -364,5 +364,6 @@ extern int __sys_sendto(int fd, void __user *buff, size_t 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); +extern int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen); #endif /* _LINUX_SOCKET_H */ diff --git a/net/compat.c b/net/compat.c index 5b3b74c5812e..bba555b1d863 100644 --- a/net/compat.c +++ b/net/compat.c @@ -814,7 +814,7 @@ COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) ret = __sys_socket(a0, a1, a[2]); break; case SYS_BIND: - ret = sys_bind(a0, compat_ptr(a1), a[2]); + ret = __sys_bind(a0, compat_ptr(a1), a[2]); break; case SYS_CONNECT: ret = sys_connect(a0, compat_ptr(a1), a[2]); diff --git a/net/socket.c b/net/socket.c index 07f379e50def..291cdae97341 100644 --- a/net/socket.c +++ b/net/socket.c @@ -1462,7 +1462,7 @@ SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, * the protocol layer (having also checked the address is ok). */ -SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) +int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) { struct socket *sock; struct sockaddr_storage address; @@ -1485,6 +1485,11 @@ SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) return err; } +SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) +{ + return __sys_bind(fd, umyaddr, addrlen); +} + /* * Perform a listen. Basically, we allow the protocol to do anything * necessary for a listen, and if that works, we mark the socket as @@ -2471,7 +2476,7 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) err = __sys_socket(a0, a1, a[2]); break; case SYS_BIND: - err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); + err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); break; case SYS_CONNECT: err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); -- 2.16.3
