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net: add __sys_connect_file() helper 

This is identical to __sys_connect(), except it takes a struct file
instead of an fd, and it also allows passing in extra file->f_flags
flags. The latter is done to support masking in O_NONBLOCK without
manipulating the original file flags.

No functional changes in this patch.

Cc: netdev@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-11-23 14:17:16 -07:00
parent c4a2ed72c9
commit bd3ded3146
2 changed files with 25 additions and 8 deletions
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3
include/linux/socket.h
View File

@ -399,6 +399,9 @@ 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);
extern int __sys_connect_file(struct file *file,
struct sockaddr __user *uservaddr, int addrlen,
int file_flags);
extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,
int addrlen);
extern int __sys_listen(int fd, int backlog);

30
net/socket.c
View File

@ -1825,32 +1825,46 @@ SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
* include the -EINPROGRESS status for such sockets.
*/
int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
int __sys_connect_file(struct file *file, struct sockaddr __user *uservaddr,
int addrlen, int file_flags)
{
struct socket *sock;
struct sockaddr_storage address;
int err, fput_needed;
int err;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
sock = sock_from_file(file, &err);
if (!sock)
goto out;
err = move_addr_to_kernel(uservaddr, addrlen, &address);
if (err < 0)
goto out_put;
goto out;
err =
security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
if (err)
goto out_put;
goto out;
err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
sock->file->f_flags);
out_put:
fput_light(sock->file, fput_needed);
sock->file->f_flags | file_flags);
out:
return err;
}
int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
{
int ret = -EBADF;
struct fd f;
f = fdget(fd);
if (f.file) {
ret = __sys_connect_file(f.file, uservaddr, addrlen, 0);
if (f.flags)
fput(f.file);
}
return ret;
}
SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
int, addrlen)
{