Messages in this thread Patch in this message | | | From | Alex Gartrell <> | Subject | [PATCH net-next 2/2] tun: enable socket system calls | Date | Thu, 25 Dec 2014 22:50:24 -0800 |
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By setting private_data to a socket and private_data_is_socket to true, we can use the socket syscalls. We also can't just blindly use private_data anymore, so there's a __tun_file_get function that returns the container_of private_data appropriately.
Signed-off-by: Alex Gartrell <agartrell@fb.com> --- drivers/net/tun.c | 34 ++++++++++++++++++++++------------ 1 file changed, 22 insertions(+), 12 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index a5cbf67..b16ddc5 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -547,9 +547,18 @@ static void tun_detach_all(struct net_device *dev) module_put(THIS_MODULE); } +static struct tun_file *tun_file_from_file(struct file *file) +{ + struct socket *s = (struct socket *)file->private_data; + + if (!s) + return NULL; + return container_of(s, struct tun_file, socket); +} + static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) { - struct tun_file *tfile = file->private_data; + struct tun_file *tfile = tun_file_from_file(file); int err; err = security_tun_dev_attach(tfile->socket.sk, tun->security); @@ -612,7 +621,7 @@ static struct tun_struct *__tun_get(struct tun_file *tfile) static struct tun_struct *tun_get(struct file *file) { - return __tun_get(file->private_data); + return __tun_get(tun_file_from_file(file)); } static void tun_put(struct tun_struct *tun) @@ -973,7 +982,7 @@ static void tun_net_init(struct net_device *dev) /* Poll */ static unsigned int tun_chr_poll(struct file *file, poll_table *wait) { - struct tun_file *tfile = file->private_data; + struct tun_file *tfile = tun_file_from_file(file); struct tun_struct *tun = __tun_get(tfile); struct sock *sk; unsigned int mask = 0; @@ -1235,7 +1244,7 @@ static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) { struct file *file = iocb->ki_filp; struct tun_struct *tun = tun_get(file); - struct tun_file *tfile = file->private_data; + struct tun_file *tfile = tun_file_from_file(file); ssize_t result; if (!tun) @@ -1392,7 +1401,7 @@ static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) { struct file *file = iocb->ki_filp; - struct tun_file *tfile = file->private_data; + struct tun_file *tfile = tun_file_from_file(file); struct tun_struct *tun = __tun_get(tfile); ssize_t len = iov_iter_count(to), ret; @@ -1567,7 +1576,7 @@ static DEVICE_ATTR(group, 0444, tun_show_group, NULL); static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) { struct tun_struct *tun; - struct tun_file *tfile = file->private_data; + struct tun_file *tfile = tun_file_from_file(file); struct net_device *dev; int err; @@ -1801,7 +1810,7 @@ static void tun_set_sndbuf(struct tun_struct *tun) static int tun_set_queue(struct file *file, struct ifreq *ifr) { - struct tun_file *tfile = file->private_data; + struct tun_file *tfile = tun_file_from_file(file); struct tun_struct *tun; int ret = 0; @@ -1834,7 +1843,7 @@ unlock: static long __tun_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg, int ifreq_len) { - struct tun_file *tfile = file->private_data; + struct tun_file *tfile = tun_file_from_file(file); struct tun_struct *tun; void __user* argp = (void __user*)arg; struct ifreq ifr; @@ -2122,7 +2131,7 @@ static long tun_chr_compat_ioctl(struct file *file, static int tun_chr_fasync(int fd, struct file *file, int on) { - struct tun_file *tfile = file->private_data; + struct tun_file *tfile = tun_file_from_file(file); int ret; if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) @@ -2165,7 +2174,8 @@ static int tun_chr_open(struct inode *inode, struct file * file) tfile->sk.sk_write_space = tun_sock_write_space; tfile->sk.sk_sndbuf = INT_MAX; - file->private_data = tfile; + file->private_data = &tfile->socket; + file->private_data_is_socket = true; set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags); INIT_LIST_HEAD(&tfile->next); @@ -2176,7 +2186,7 @@ static int tun_chr_open(struct inode *inode, struct file * file) static int tun_chr_close(struct inode *inode, struct file *file) { - struct tun_file *tfile = file->private_data; + struct tun_file *tfile = tun_file_from_file(file); struct net *net = tfile->net; tun_detach(tfile, true); @@ -2335,7 +2345,7 @@ struct socket *tun_get_socket(struct file *file) struct tun_file *tfile; if (file->f_op != &tun_fops) return ERR_PTR(-EINVAL); - tfile = file->private_data; + tfile = tun_file_from_file(file); if (!tfile) return ERR_PTR(-EBADFD); return &tfile->socket; -- Alex Gartrell <agartrell@fb.com>
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