Thread (8 messages) flat view 8 messages, 2 authors, 2012-08-15
STALE5119d

[RFC PATCH 5/5] syscall: sys_fbind() introduced

From: Stanislav Kinsbursky <hidden>
Date: 2012-08-15 16:25:08
Also in: lkml
Subsystem: abi/api, networking [general], networking [sockets], the rest, x86 architecture (32-bit and 64-bit) · Maintainers: "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Kuniyuki Iwashima, Willem de Bruijn, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen

This syscall allows to bind socket to specified file descriptor.
Descriptor can be gained by simple open with O_PATH flag.
Socket node can be created by sys_mknod().

Signed-off-by: Stanislav Kinsbursky <redacted>
---
 arch/x86/syscalls/syscall_32.tbl |    1 +
 arch/x86/syscalls/syscall_64.tbl |    1 +
 include/linux/syscalls.h         |    1 +
 kernel/sys_ni.c                  |    3 +++
 net/socket.c                     |   25 +++++++++++++++++++++++++
 5 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/arch/x86/syscalls/syscall_32.tbl b/arch/x86/syscalls/syscall_32.tbl
index 7a35a6e..9594b82 100644
--- a/arch/x86/syscalls/syscall_32.tbl
+++ b/arch/x86/syscalls/syscall_32.tbl
@@ -356,3 +356,4 @@
 347	i386	process_vm_readv	sys_process_vm_readv		compat_sys_process_vm_readv
 348	i386	process_vm_writev	sys_process_vm_writev		compat_sys_process_vm_writev
 349	i386	kcmp			sys_kcmp
+350	i386	fbind			sys_fbind
diff --git a/arch/x86/syscalls/syscall_64.tbl b/arch/x86/syscalls/syscall_64.tbl
index 51171ae..f964df8 100644
--- a/arch/x86/syscalls/syscall_64.tbl
+++ b/arch/x86/syscalls/syscall_64.tbl
@@ -319,6 +319,7 @@
 310	64	process_vm_readv	sys_process_vm_readv
 311	64	process_vm_writev	sys_process_vm_writev
 312	64	kcmp			sys_kcmp
+313	common	fbind			sys_fbind
 
 #
 # x32-specific system call numbers start at 512 to avoid cache impact
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 19439c7..9e78fa4 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -602,6 +602,7 @@ asmlinkage long sys_setsockopt(int fd, int level, int optname,
 asmlinkage long sys_getsockopt(int fd, int level, int optname,
 				char __user *optval, int __user *optlen);
 asmlinkage long sys_bind(int, struct sockaddr __user *, int);
+asmlinkage long sys_fbind(int, int);
 asmlinkage long sys_connect(int, struct sockaddr __user *, int);
 asmlinkage long sys_accept(int, struct sockaddr __user *, int __user *);
 asmlinkage long sys_accept4(int, struct sockaddr __user *, int __user *, int);
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index dbff751..30c393a 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -206,3 +206,6 @@ cond_syscall(compat_sys_open_by_handle_at);
 
 /* compare kernel pointers */
 cond_syscall(sys_kcmp);
+
+cond_syscall(sys_fbind);
+
diff --git a/net/socket.c b/net/socket.c
index 6e0ccc0..67d9795 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1432,6 +1432,31 @@ out:
 	return err;
 }
 
+SYSCALL_DEFINE2(fbind, int, fd, int, sk_fd)
+{
+	struct socket *sock;
+	int err, fput_sk, fput_fd;
+	struct file *file;
+
+	sock = sockfd_lookup_light(sk_fd, &err, &fput_sk);
+	if (!sock)
+		return err;
+
+	err = -EBADF;
+	file = fget_raw_light(fd, &fput_fd);
+	if (!file)
+		goto out_put_sk;
+
+	err = -EINVAL;
+	if (sock->ops->fbind)
+		err = sock->ops->fbind(file, sock);
+
+	fput_light(file, fput_fd);
+out_put_sk:
+	fput_light(sock->file, fput_sk);
+	return err;
+}
+
 /*
  *	Bind a name to a socket. Nothing much to do here since it's
  *	the protocol's responsibility to handle the local address.
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