net: socket: add __sys_socketpair() helper; remove in-kernel call to syscall
Using the net-internal helper __sys_socketpair() allows us to avoid the internal calls to the sys_socketpair() 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>
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@ -372,5 +372,7 @@ extern int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
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int __user *usockaddr_len);
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int __user *usockaddr_len);
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extern int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
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extern int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
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int __user *usockaddr_len);
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int __user *usockaddr_len);
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extern int __sys_socketpair(int family, int type, int protocol,
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int __user *usockvec);
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#endif /* _LINUX_SOCKET_H */
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#endif /* _LINUX_SOCKET_H */
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@ -832,7 +832,7 @@ COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
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ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
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ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
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break;
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break;
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case SYS_SOCKETPAIR:
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case SYS_SOCKETPAIR:
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ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
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ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
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break;
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break;
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case SYS_SEND:
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case SYS_SEND:
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ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
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ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
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11
net/socket.c
11
net/socket.c
@ -1368,8 +1368,7 @@ SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
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* Create a pair of connected sockets.
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* Create a pair of connected sockets.
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*/
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*/
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SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
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int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
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int __user *, usockvec)
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{
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{
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struct socket *sock1, *sock2;
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struct socket *sock1, *sock2;
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int fd1, fd2, err;
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int fd1, fd2, err;
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@ -1454,6 +1453,12 @@ out:
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return err;
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return err;
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}
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}
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SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
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int __user *, usockvec)
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{
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return __sys_socketpair(family, type, protocol, usockvec);
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}
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/*
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/*
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* Bind a name to a socket. Nothing much to do here since it's
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* Bind a name to a socket. Nothing much to do here since it's
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* the protocol's responsibility to handle the local address.
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* the protocol's responsibility to handle the local address.
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@ -2521,7 +2526,7 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
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(int __user *)a[2]);
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(int __user *)a[2]);
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break;
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break;
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case SYS_SOCKETPAIR:
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case SYS_SOCKETPAIR:
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err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
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err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
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break;
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break;
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case SYS_SEND:
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case SYS_SEND:
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err = sys_send(a0, (void __user *)a1, a[2], a[3]);
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err = sys_send(a0, (void __user *)a1, a[2], a[3]);
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