Home » Mailing lists » Devel » [RFC PATCH 0/5] net: socket bind to file descriptor introduced
| [RFC PATCH 5/5] syscall: sys_fbind() introduced [message #47540 is a reply to message #47535] |
Wed, 15 August 2012 16:22   |
Stanislav Kinsbursky
Messages: 683
Registered: October 2011
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Senior Member |
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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 <skinsbursky@parallels.com>
---
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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