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Message-ID: <4FE94EC3.2060802@redhat.com>
Date: Tue, 26 Jun 2012 13:55:15 +0800
From: Jason Wang <jasowang@...hat.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
CC: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
krkumar2@...ibm.com, tahm@...ux.vnet.ibm.com, akong@...hat.com,
davem@...emloft.net, shemminger@...tta.com, mashirle@...ibm.com
Subject: Re: [net-next RFC V3 PATCH 1/6] tuntap: move socket to tun_file
On 06/25/2012 04:27 PM, Michael S. Tsirkin wrote:
> On Mon, Jun 25, 2012 at 02:09:45PM +0800, Jason Wang wrote:
>> This patch moves socket structure from tun_device and to tun_file in order to
>> let it possbile for multiple sockets to be attached to tun/tap device. The
>> reference between tap device and socket was setup during TUNSETIFF as
>> usual.
>>
>> After this patch, we can go further towards multiqueue tun/tap support by
>> storing an array of pointers of tun_file in tun_device.
>>
>> Signed-off-by: Jason Wang<jasowang@...hat.com>
> I think this changes visible userspace
> behaviour for persistent devices.
>
> Specifically, with this patch, TUNSETSNDBUF and TUNATTACHFILTER won't
> be effective if you close and reopen the device, right?
Yes, good catch.
> It's possible that no application uses either of these
> ioctls on persistent tun devices at the moment,
> but seems safer to avoid changing such behaviour.
Agree, I would modify the socket filer and sndbuf to be per-device
instead of per-socket.
>
>> ---
>> drivers/net/tun.c | 352 +++++++++++++++++++++++++++--------------------------
>> 1 files changed, 181 insertions(+), 171 deletions(-)
>>
>> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
>> index 987aeef..1f27789 100644
>> --- a/drivers/net/tun.c
>> +++ b/drivers/net/tun.c
>> @@ -108,9 +108,16 @@ struct tap_filter {
>> };
>>
>> struct tun_file {
>> + struct sock sk;
>> + struct socket socket;
>> + struct socket_wq wq;
>> + int vnet_hdr_sz;
>> + struct tap_filter txflt;
>> atomic_t count;
>> struct tun_struct *tun;
>> struct net *net;
>> + struct fasync_struct *fasync;
>> + unsigned int flags;
>> };
>>
>> struct tun_sock;
>> @@ -125,29 +132,12 @@ struct tun_struct {
>> netdev_features_t set_features;
>> #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \
>> NETIF_F_TSO6|NETIF_F_UFO)
>> - struct fasync_struct *fasync;
>> -
>> - struct tap_filter txflt;
>> - struct socket socket;
>> - struct socket_wq wq;
>> -
>> - int vnet_hdr_sz;
>>
>> #ifdef TUN_DEBUG
>> int debug;
>> #endif
>> };
>>
>> -struct tun_sock {
>> - struct sock sk;
>> - struct tun_struct *tun;
>> -};
>> -
>> -static inline struct tun_sock *tun_sk(struct sock *sk)
>> -{
>> - return container_of(sk, struct tun_sock, sk);
>> -}
>> -
>> static int tun_attach(struct tun_struct *tun, struct file *file)
>> {
>> struct tun_file *tfile = file->private_data;
>> @@ -168,10 +158,9 @@ static int tun_attach(struct tun_struct *tun, struct file *file)
>> err = 0;
>> tfile->tun = tun;
>> tun->tfile = tfile;
>> - tun->socket.file = file;
>> netif_carrier_on(tun->dev);
>> dev_hold(tun->dev);
>> - sock_hold(tun->socket.sk);
>> + sock_hold(&tfile->sk);
>> atomic_inc(&tfile->count);
>>
>> out:
>> @@ -181,15 +170,15 @@ out:
>>
>> static void __tun_detach(struct tun_struct *tun)
>> {
>> + struct tun_file *tfile = tun->tfile;
>> /* Detach from net device */
>> netif_tx_lock_bh(tun->dev);
>> netif_carrier_off(tun->dev);
>> tun->tfile = NULL;
>> - tun->socket.file = NULL;
>> netif_tx_unlock_bh(tun->dev);
>>
>> /* Drop read queue */
>> - skb_queue_purge(&tun->socket.sk->sk_receive_queue);
>> + skb_queue_purge(&tfile->socket.sk->sk_receive_queue);
>>
>> /* Drop the extra count on the net device */
>> dev_put(tun->dev);
>> @@ -348,19 +337,12 @@ static void tun_net_uninit(struct net_device *dev)
>> /* Inform the methods they need to stop using the dev.
>> */
>> if (tfile) {
>> - wake_up_all(&tun->wq.wait);
>> + wake_up_all(&tfile->wq.wait);
>> if (atomic_dec_and_test(&tfile->count))
>> __tun_detach(tun);
>> }
>> }
>>
>> -static void tun_free_netdev(struct net_device *dev)
>> -{
>> - struct tun_struct *tun = netdev_priv(dev);
>> -
>> - sk_release_kernel(tun->socket.sk);
>> -}
>> -
>> /* Net device open. */
>> static int tun_net_open(struct net_device *dev)
>> {
>> @@ -379,24 +361,26 @@ static int tun_net_close(struct net_device *dev)
>> static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
>> {
>> struct tun_struct *tun = netdev_priv(dev);
>> + struct tun_file *tfile = tun->tfile;
>>
>> tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len);
>>
>> /* Drop packet if interface is not attached */
>> - if (!tun->tfile)
>> + if (!tfile)
>> goto drop;
>>
>> /* Drop if the filter does not like it.
>> * This is a noop if the filter is disabled.
>> * Filter can be enabled only for the TAP devices. */
>> - if (!check_filter(&tun->txflt, skb))
>> + if (!check_filter(&tfile->txflt, skb))
>> goto drop;
>>
>> - if (tun->socket.sk->sk_filter&&
>> - sk_filter(tun->socket.sk, skb))
>> + if (tfile->socket.sk->sk_filter&&
>> + sk_filter(tfile->socket.sk, skb))
>> goto drop;
>>
>> - if (skb_queue_len(&tun->socket.sk->sk_receive_queue)>= dev->tx_queue_len) {
>> + if (skb_queue_len(&tfile->socket.sk->sk_receive_queue)
>> + >= dev->tx_queue_len) {
>> if (!(tun->flags& TUN_ONE_QUEUE)) {
>> /* Normal queueing mode. */
>> /* Packet scheduler handles dropping of further packets. */
>> @@ -417,12 +401,12 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
>> skb_orphan(skb);
>>
>> /* Enqueue packet */
>> - skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb);
>> + skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb);
>>
>> /* Notify and wake up reader process */
>> - if (tun->flags& TUN_FASYNC)
>> - kill_fasync(&tun->fasync, SIGIO, POLL_IN);
>> - wake_up_interruptible_poll(&tun->wq.wait, POLLIN |
>> + if (tfile->flags& TUN_FASYNC)
>> + kill_fasync(&tfile->fasync, SIGIO, POLL_IN);
>> + wake_up_interruptible_poll(&tfile->wq.wait, POLLIN |
>> POLLRDNORM | POLLRDBAND);
>> return NETDEV_TX_OK;
>>
>> @@ -550,11 +534,11 @@ static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
>> if (!tun)
>> return POLLERR;
>>
>> - sk = tun->socket.sk;
>> + sk = tfile->socket.sk;
>>
>> tun_debug(KERN_INFO, tun, "tun_chr_poll\n");
>>
>> - poll_wait(file,&tun->wq.wait, wait);
>> + poll_wait(file,&tfile->wq.wait, wait);
>>
>> if (!skb_queue_empty(&sk->sk_receive_queue))
>> mask |= POLLIN | POLLRDNORM;
>> @@ -573,11 +557,11 @@ static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
>>
>> /* prepad is the amount to reserve at front. len is length after that.
>> * linear is a hint as to how much to copy (usually headers). */
>> -static struct sk_buff *tun_alloc_skb(struct tun_struct *tun,
>> +static struct sk_buff *tun_alloc_skb(struct tun_file *tfile,
>> size_t prepad, size_t len,
>> size_t linear, int noblock)
>> {
>> - struct sock *sk = tun->socket.sk;
>> + struct sock *sk = tfile->socket.sk;
>> struct sk_buff *skb;
>> int err;
>>
>> @@ -601,7 +585,7 @@ static struct sk_buff *tun_alloc_skb(struct tun_struct *tun,
>> }
>>
>> /* Get packet from user space buffer */
>> -static ssize_t tun_get_user(struct tun_struct *tun,
>> +static ssize_t tun_get_user(struct tun_file *tfile,
>> const struct iovec *iv, size_t count,
>> int noblock)
>> {
>> @@ -610,8 +594,10 @@ static ssize_t tun_get_user(struct tun_struct *tun,
>> size_t len = count, align = NET_SKB_PAD;
>> struct virtio_net_hdr gso = { 0 };
>> int offset = 0;
>> + struct tun_struct *tun = NULL;
>> + bool drop = false, error = false;
>>
>> - if (!(tun->flags& TUN_NO_PI)) {
>> + if (!(tfile->flags& TUN_NO_PI)) {
>> if ((len -= sizeof(pi))> count)
>> return -EINVAL;
>>
>> @@ -620,8 +606,9 @@ static ssize_t tun_get_user(struct tun_struct *tun,
>> offset += sizeof(pi);
>> }
>>
>> - if (tun->flags& TUN_VNET_HDR) {
>> - if ((len -= tun->vnet_hdr_sz)> count)
>> + if (tfile->flags& TUN_VNET_HDR) {
>> + len -= tfile->vnet_hdr_sz;
>> + if (len> count)
>> return -EINVAL;
>>
>> if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso)))
>> @@ -633,41 +620,43 @@ static ssize_t tun_get_user(struct tun_struct *tun,
>>
>> if (gso.hdr_len> len)
>> return -EINVAL;
>> - offset += tun->vnet_hdr_sz;
>> + offset += tfile->vnet_hdr_sz;
>> }
>>
>> - if ((tun->flags& TUN_TYPE_MASK) == TUN_TAP_DEV) {
>> + if ((tfile->flags& TUN_TYPE_MASK) == TUN_TAP_DEV) {
>> align += NET_IP_ALIGN;
>> if (unlikely(len< ETH_HLEN ||
>> (gso.hdr_len&& gso.hdr_len< ETH_HLEN)))
>> return -EINVAL;
>> }
>>
>> - skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock);
>> + skb = tun_alloc_skb(tfile, align, len, gso.hdr_len, noblock);
>> +
>> if (IS_ERR(skb)) {
>> if (PTR_ERR(skb) != -EAGAIN)
>> - tun->dev->stats.rx_dropped++;
>> - return PTR_ERR(skb);
>> + drop = true;
>> + count = PTR_ERR(skb);
>> + goto err;
>> }
>>
>> if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) {
>> - tun->dev->stats.rx_dropped++;
>> + drop = true;
>> kfree_skb(skb);
>> - return -EFAULT;
>> + count = -EFAULT;
>> + goto err;
>> }
>>
>> if (gso.flags& VIRTIO_NET_HDR_F_NEEDS_CSUM) {
>> if (!skb_partial_csum_set(skb, gso.csum_start,
>> gso.csum_offset)) {
>> - tun->dev->stats.rx_frame_errors++;
>> - kfree_skb(skb);
>> - return -EINVAL;
>> + error = true;
>> + goto err_free;
>> }
>> }
>>
>> - switch (tun->flags& TUN_TYPE_MASK) {
>> + switch (tfile->flags& TUN_TYPE_MASK) {
>> case TUN_TUN_DEV:
>> - if (tun->flags& TUN_NO_PI) {
>> + if (tfile->flags& TUN_NO_PI) {
>> switch (skb->data[0]& 0xf0) {
>> case 0x40:
>> pi.proto = htons(ETH_P_IP);
>> @@ -676,18 +665,15 @@ static ssize_t tun_get_user(struct tun_struct *tun,
>> pi.proto = htons(ETH_P_IPV6);
>> break;
>> default:
>> - tun->dev->stats.rx_dropped++;
>> - kfree_skb(skb);
>> - return -EINVAL;
>> + drop = true;
>> + goto err_free;
>> }
>> }
>>
>> skb_reset_mac_header(skb);
>> skb->protocol = pi.proto;
>> - skb->dev = tun->dev;
>> break;
>> case TUN_TAP_DEV:
>> - skb->protocol = eth_type_trans(skb, tun->dev);
>> break;
>> }
>>
>> @@ -704,9 +690,8 @@ static ssize_t tun_get_user(struct tun_struct *tun,
>> skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
>> break;
>> default:
>> - tun->dev->stats.rx_frame_errors++;
>> - kfree_skb(skb);
>> - return -EINVAL;
>> + error = true;
>> + goto err_free;
>> }
>>
>> if (gso.gso_type& VIRTIO_NET_HDR_GSO_ECN)
>> @@ -714,9 +699,8 @@ static ssize_t tun_get_user(struct tun_struct *tun,
>>
>> skb_shinfo(skb)->gso_size = gso.gso_size;
>> if (skb_shinfo(skb)->gso_size == 0) {
>> - tun->dev->stats.rx_frame_errors++;
>> - kfree_skb(skb);
>> - return -EINVAL;
>> + error = true;
>> + goto err_free;
>> }
>>
>> /* Header must be checked, and gso_segs computed. */
>> @@ -724,11 +708,38 @@ static ssize_t tun_get_user(struct tun_struct *tun,
>> skb_shinfo(skb)->gso_segs = 0;
>> }
>>
>> - netif_rx_ni(skb);
>> + tun = __tun_get(tfile);
>> + if (!tun)
>> + return -EBADFD;
>>
>> + switch (tfile->flags& TUN_TYPE_MASK) {
>> + case TUN_TUN_DEV:
>> + skb->dev = tun->dev;
>> + break;
>> + case TUN_TAP_DEV:
>> + skb->protocol = eth_type_trans(skb, tun->dev);
>> + break;
>> + }
>> +
>> + netif_rx_ni(skb);
>> tun->dev->stats.rx_packets++;
>> tun->dev->stats.rx_bytes += len;
>> + tun_put(tun);
>> + return count;
>> +
>> +err_free:
>> + count = -EINVAL;
>> + kfree_skb(skb);
>> +err:
>> + tun = __tun_get(tfile);
>> + if (!tun)
>> + return -EBADFD;
>>
>> + if (drop)
>> + tun->dev->stats.rx_dropped++;
>> + if (error)
>> + tun->dev->stats.rx_frame_errors++;
>> + tun_put(tun);
>> return count;
>> }
>>
>> @@ -736,30 +747,25 @@ static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
>> unsigned long count, loff_t pos)
>> {
>> struct file *file = iocb->ki_filp;
>> - struct tun_struct *tun = tun_get(file);
>> + struct tun_file *tfile = file->private_data;
>> ssize_t result;
>>
>> - if (!tun)
>> - return -EBADFD;
>> -
>> - tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count);
>> -
>> - result = tun_get_user(tun, iv, iov_length(iv, count),
>> + result = tun_get_user(tfile, iv, iov_length(iv, count),
>> file->f_flags& O_NONBLOCK);
>>
>> - tun_put(tun);
>> return result;
>> }
>>
>> /* Put packet to the user space buffer */
>> -static ssize_t tun_put_user(struct tun_struct *tun,
>> +static ssize_t tun_put_user(struct tun_file *tfile,
>> struct sk_buff *skb,
>> const struct iovec *iv, int len)
>> {
>> + struct tun_struct *tun = NULL;
>> struct tun_pi pi = { 0, skb->protocol };
>> ssize_t total = 0;
>>
>> - if (!(tun->flags& TUN_NO_PI)) {
>> + if (!(tfile->flags& TUN_NO_PI)) {
>> if ((len -= sizeof(pi))< 0)
>> return -EINVAL;
>>
>> @@ -773,9 +779,10 @@ static ssize_t tun_put_user(struct tun_struct *tun,
>> total += sizeof(pi);
>> }
>>
>> - if (tun->flags& TUN_VNET_HDR) {
>> + if (tfile->flags& TUN_VNET_HDR) {
>> struct virtio_net_hdr gso = { 0 }; /* no info leak */
>> - if ((len -= tun->vnet_hdr_sz)< 0)
>> + len -= tfile->vnet_hdr_sz;
>> + if (len< 0)
>> return -EINVAL;
>>
>> if (skb_is_gso(skb)) {
>> @@ -818,7 +825,7 @@ static ssize_t tun_put_user(struct tun_struct *tun,
>> if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total,
>> sizeof(gso))))
>> return -EFAULT;
>> - total += tun->vnet_hdr_sz;
>> + total += tfile->vnet_hdr_sz;
>> }
>>
>> len = min_t(int, skb->len, len);
>> @@ -826,29 +833,33 @@ static ssize_t tun_put_user(struct tun_struct *tun,
>> skb_copy_datagram_const_iovec(skb, 0, iv, total, len);
>> total += skb->len;
>>
>> - tun->dev->stats.tx_packets++;
>> - tun->dev->stats.tx_bytes += len;
>> + tun = __tun_get(tfile);
>> + if (tun) {
>> + tun->dev->stats.tx_packets++;
>> + tun->dev->stats.tx_bytes += len;
>> + tun_put(tun);
>> + }
>>
>> return total;
>> }
>>
>> -static ssize_t tun_do_read(struct tun_struct *tun,
>> +static ssize_t tun_do_read(struct tun_file *tfile,
>> struct kiocb *iocb, const struct iovec *iv,
>> ssize_t len, int noblock)
>> {
>> DECLARE_WAITQUEUE(wait, current);
>> struct sk_buff *skb;
>> ssize_t ret = 0;
>> -
>> - tun_debug(KERN_INFO, tun, "tun_chr_read\n");
>> + struct tun_struct *tun = NULL;
>>
>> if (unlikely(!noblock))
>> - add_wait_queue(&tun->wq.wait,&wait);
>> + add_wait_queue(&tfile->wq.wait,&wait);
>> while (len) {
>> current->state = TASK_INTERRUPTIBLE;
>>
>> + skb = skb_dequeue(&tfile->socket.sk->sk_receive_queue);
>> /* Read frames from the queue */
>> - if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) {
>> + if (!skb) {
>> if (noblock) {
>> ret = -EAGAIN;
>> break;
>> @@ -857,25 +868,38 @@ static ssize_t tun_do_read(struct tun_struct *tun,
>> ret = -ERESTARTSYS;
>> break;
>> }
>> +
>> + tun = __tun_get(tfile);
>> + if (!tun) {
>> + ret = -EIO;
>> + break;
>> + }
>> if (tun->dev->reg_state != NETREG_REGISTERED) {
>> ret = -EIO;
>> + tun_put(tun);
>> break;
>> }
>> + tun_put(tun);
>>
>> /* Nothing to read, let's sleep */
>> schedule();
>> continue;
>> }
>> - netif_wake_queue(tun->dev);
>>
>> - ret = tun_put_user(tun, skb, iv, len);
>> + tun = __tun_get(tfile);
>> + if (tun) {
>> + netif_wake_queue(tun->dev);
>> + tun_put(tun);
>> + }
>> +
>> + ret = tun_put_user(tfile, skb, iv, len);
>> kfree_skb(skb);
>> break;
>> }
>>
>> current->state = TASK_RUNNING;
>> if (unlikely(!noblock))
>> - remove_wait_queue(&tun->wq.wait,&wait);
>> + remove_wait_queue(&tfile->wq.wait,&wait);
>>
>> return ret;
>> }
>> @@ -885,21 +909,17 @@ static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
>> {
>> struct file *file = iocb->ki_filp;
>> struct tun_file *tfile = file->private_data;
>> - struct tun_struct *tun = __tun_get(tfile);
>> ssize_t len, ret;
>>
>> - if (!tun)
>> - return -EBADFD;
>> len = iov_length(iv, count);
>> if (len< 0) {
>> ret = -EINVAL;
>> goto out;
>> }
>>
>> - ret = tun_do_read(tun, iocb, iv, len, file->f_flags& O_NONBLOCK);
>> + ret = tun_do_read(tfile, iocb, iv, len, file->f_flags& O_NONBLOCK);
>> ret = min_t(ssize_t, ret, len);
>> out:
>> - tun_put(tun);
>> return ret;
>> }
>>
>> @@ -911,7 +931,7 @@ static void tun_setup(struct net_device *dev)
>> tun->group = -1;
>>
>> dev->ethtool_ops =&tun_ethtool_ops;
>> - dev->destructor = tun_free_netdev;
>> + dev->destructor = free_netdev;
>> }
>>
>> /* Trivial set of netlink ops to allow deleting tun or tap
>> @@ -931,7 +951,7 @@ static struct rtnl_link_ops tun_link_ops __read_mostly = {
>>
>> static void tun_sock_write_space(struct sock *sk)
>> {
>> - struct tun_struct *tun;
>> + struct tun_file *tfile = NULL;
>> wait_queue_head_t *wqueue;
>>
>> if (!sock_writeable(sk))
>> @@ -945,37 +965,38 @@ static void tun_sock_write_space(struct sock *sk)
>> wake_up_interruptible_sync_poll(wqueue, POLLOUT |
>> POLLWRNORM | POLLWRBAND);
>>
>> - tun = tun_sk(sk)->tun;
>> - kill_fasync(&tun->fasync, SIGIO, POLL_OUT);
>> -}
>> -
>> -static void tun_sock_destruct(struct sock *sk)
>> -{
>> - free_netdev(tun_sk(sk)->tun->dev);
>> + tfile = container_of(sk, struct tun_file, sk);
>> + kill_fasync(&tfile->fasync, SIGIO, POLL_OUT);
>> }
>>
>> static int tun_sendmsg(struct kiocb *iocb, struct socket *sock,
>> struct msghdr *m, size_t total_len)
>> {
>> - struct tun_struct *tun = container_of(sock, struct tun_struct, socket);
>> - return tun_get_user(tun, m->msg_iov, total_len,
>> - m->msg_flags& MSG_DONTWAIT);
>> + struct tun_file *tfile = container_of(sock, struct tun_file, socket);
>> + ssize_t result;
>> +
>> + result = tun_get_user(tfile, m->msg_iov, total_len,
>> + m->msg_flags& MSG_DONTWAIT);
>> + return result;
>> }
>>
>> static int tun_recvmsg(struct kiocb *iocb, struct socket *sock,
>> struct msghdr *m, size_t total_len,
>> int flags)
>> {
>> - struct tun_struct *tun = container_of(sock, struct tun_struct, socket);
>> + struct tun_file *tfile = container_of(sock, struct tun_file, socket);
>> int ret;
>> +
>> if (flags& ~(MSG_DONTWAIT|MSG_TRUNC))
>> return -EINVAL;
>> - ret = tun_do_read(tun, iocb, m->msg_iov, total_len,
>> +
>> + ret = tun_do_read(tfile, iocb, m->msg_iov, total_len,
>> flags& MSG_DONTWAIT);
>> if (ret> total_len) {
>> m->msg_flags |= MSG_TRUNC;
>> ret = flags& MSG_TRUNC ? ret : total_len;
>> }
>> +
>> return ret;
>> }
>>
>> @@ -996,7 +1017,7 @@ static const struct proto_ops tun_socket_ops = {
>> static struct proto tun_proto = {
>> .name = "tun",
>> .owner = THIS_MODULE,
>> - .obj_size = sizeof(struct tun_sock),
>> + .obj_size = sizeof(struct tun_file),
>> };
>>
>> static int tun_flags(struct tun_struct *tun)
>> @@ -1047,8 +1068,8 @@ static DEVICE_ATTR(group, 0444, tun_show_group, NULL);
>>
>> static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
>> {
>> - struct sock *sk;
>> struct tun_struct *tun;
>> + struct tun_file *tfile = file->private_data;
>> struct net_device *dev;
>> int err;
>>
>> @@ -1069,7 +1090,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
>> (tun->group != -1&& !in_egroup_p(tun->group)))&&
>> !capable(CAP_NET_ADMIN))
>> return -EPERM;
>> - err = security_tun_dev_attach(tun->socket.sk);
>> + err = security_tun_dev_attach(tfile->socket.sk);
>> if (err< 0)
>> return err;
>>
>> @@ -1113,25 +1134,8 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
>> tun = netdev_priv(dev);
>> tun->dev = dev;
>> tun->flags = flags;
>> - tun->txflt.count = 0;
>> - tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
>>
>> - err = -ENOMEM;
>> - sk = sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL,&tun_proto);
>> - if (!sk)
>> - goto err_free_dev;
>> -
>> - sk_change_net(sk, net);
>> - tun->socket.wq =&tun->wq;
>> - init_waitqueue_head(&tun->wq.wait);
>> - tun->socket.ops =&tun_socket_ops;
>> - sock_init_data(&tun->socket, sk);
>> - sk->sk_write_space = tun_sock_write_space;
>> - sk->sk_sndbuf = INT_MAX;
>> -
>> - tun_sk(sk)->tun = tun;
>> -
>> - security_tun_dev_post_create(sk);
>> + security_tun_dev_post_create(&tfile->sk);
>>
>> tun_net_init(dev);
>>
>> @@ -1141,15 +1145,13 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
>>
>> err = register_netdevice(tun->dev);
>> if (err< 0)
>> - goto err_free_sk;
>> + goto err_free_dev;
>>
>> if (device_create_file(&tun->dev->dev,&dev_attr_tun_flags) ||
>> device_create_file(&tun->dev->dev,&dev_attr_owner) ||
>> device_create_file(&tun->dev->dev,&dev_attr_group))
>> pr_err("Failed to create tun sysfs files\n");
>>
>> - sk->sk_destruct = tun_sock_destruct;
>> -
>> err = tun_attach(tun, file);
>> if (err< 0)
>> goto failed;
>> @@ -1172,6 +1174,8 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
>> else
>> tun->flags&= ~TUN_VNET_HDR;
>>
>> + /* Cache flags from tun device */
>> + tfile->flags = tun->flags;
>> /* Make sure persistent devices do not get stuck in
>> * xoff state.
>> */
>> @@ -1181,11 +1185,9 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
>> strcpy(ifr->ifr_name, tun->dev->name);
>> return 0;
>>
>> - err_free_sk:
>> - tun_free_netdev(dev);
>> - err_free_dev:
>> +err_free_dev:
>> free_netdev(dev);
>> - failed:
>> +failed:
>> return err;
>> }
>>
>> @@ -1357,9 +1359,9 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
>> case TUNSETTXFILTER:
>> /* Can be set only for TAPs */
>> ret = -EINVAL;
>> - if ((tun->flags& TUN_TYPE_MASK) != TUN_TAP_DEV)
>> + if ((tfile->flags& TUN_TYPE_MASK) != TUN_TAP_DEV)
>> break;
>> - ret = update_filter(&tun->txflt, (void __user *)arg);
>> + ret = update_filter(&tfile->txflt, (void __user *)arg);
>> break;
>>
>> case SIOCGIFHWADDR:
>> @@ -1379,7 +1381,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
>> break;
>>
>> case TUNGETSNDBUF:
>> - sndbuf = tun->socket.sk->sk_sndbuf;
>> + sndbuf = tfile->socket.sk->sk_sndbuf;
>> if (copy_to_user(argp,&sndbuf, sizeof(sndbuf)))
>> ret = -EFAULT;
>> break;
>> @@ -1390,11 +1392,11 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
>> break;
>> }
>>
>> - tun->socket.sk->sk_sndbuf = sndbuf;
>> + tfile->socket.sk->sk_sndbuf = sndbuf;
>> break;
>>
>> case TUNGETVNETHDRSZ:
>> - vnet_hdr_sz = tun->vnet_hdr_sz;
>> + vnet_hdr_sz = tfile->vnet_hdr_sz;
>> if (copy_to_user(argp,&vnet_hdr_sz, sizeof(vnet_hdr_sz)))
>> ret = -EFAULT;
>> break;
>> @@ -1409,27 +1411,27 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
>> break;
>> }
>>
>> - tun->vnet_hdr_sz = vnet_hdr_sz;
>> + tfile->vnet_hdr_sz = vnet_hdr_sz;
>> break;
>>
>> case TUNATTACHFILTER:
>> /* Can be set only for TAPs */
>> ret = -EINVAL;
>> - if ((tun->flags& TUN_TYPE_MASK) != TUN_TAP_DEV)
>> + if ((tfile->flags& TUN_TYPE_MASK) != TUN_TAP_DEV)
>> break;
>> ret = -EFAULT;
>> if (copy_from_user(&fprog, argp, sizeof(fprog)))
>> break;
>>
>> - ret = sk_attach_filter(&fprog, tun->socket.sk);
>> + ret = sk_attach_filter(&fprog, tfile->socket.sk);
>> break;
>>
>> case TUNDETACHFILTER:
>> /* Can be set only for TAPs */
>> ret = -EINVAL;
>> - if ((tun->flags& TUN_TYPE_MASK) != TUN_TAP_DEV)
>> + if ((tfile->flags& TUN_TYPE_MASK) != TUN_TAP_DEV)
>> break;
>> - ret = sk_detach_filter(tun->socket.sk);
>> + ret = sk_detach_filter(tfile->socket.sk);
>> break;
>>
>> default:
>> @@ -1481,43 +1483,50 @@ static long tun_chr_compat_ioctl(struct file *file,
>>
>> static int tun_chr_fasync(int fd, struct file *file, int on)
>> {
>> - struct tun_struct *tun = tun_get(file);
>> - int ret;
>> -
>> - if (!tun)
>> - return -EBADFD;
>> -
>> - tun_debug(KERN_INFO, tun, "tun_chr_fasync %d\n", on);
>> + struct tun_file *tfile = file->private_data;
>> + int ret = fasync_helper(fd, file, on,&tfile->fasync);
>>
>> - if ((ret = fasync_helper(fd, file, on,&tun->fasync))< 0)
>> + if (ret< 0)
>> goto out;
>>
>> if (on) {
>> ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
>> if (ret)
>> goto out;
>> - tun->flags |= TUN_FASYNC;
>> + tfile->flags |= TUN_FASYNC;
>> } else
>> - tun->flags&= ~TUN_FASYNC;
>> + tfile->flags&= ~TUN_FASYNC;
>> ret = 0;
>> out:
>> - tun_put(tun);
>> return ret;
>> }
>>
>> static int tun_chr_open(struct inode *inode, struct file * file)
>> {
>> + struct net *net = current->nsproxy->net_ns;
>> struct tun_file *tfile;
>>
>> DBG1(KERN_INFO, "tunX: tun_chr_open\n");
>>
>> - tfile = kmalloc(sizeof(*tfile), GFP_KERNEL);
>> + tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL,
>> + &tun_proto);
>> if (!tfile)
>> return -ENOMEM;
>> - atomic_set(&tfile->count, 0);
>> +
>> tfile->tun = NULL;
>> - tfile->net = get_net(current->nsproxy->net_ns);
>> + tfile->net = net;
>> + tfile->txflt.count = 0;
>> + tfile->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
>> + tfile->socket.wq =&tfile->wq;
>> + init_waitqueue_head(&tfile->wq.wait);
>> + tfile->socket.file = file;
>> + tfile->socket.ops =&tun_socket_ops;
>> + sock_init_data(&tfile->socket,&tfile->sk);
>> +
>> + tfile->sk.sk_write_space = tun_sock_write_space;
>> + tfile->sk.sk_sndbuf = INT_MAX;
>> file->private_data = tfile;
>> +
>> return 0;
>> }
>>
>> @@ -1541,14 +1550,14 @@ static int tun_chr_close(struct inode *inode, struct file *file)
>> unregister_netdevice(dev);
>> rtnl_unlock();
>> }
>> - }
>>
>> - tun = tfile->tun;
>> - if (tun)
>> - sock_put(tun->socket.sk);
>> + /* drop the reference that netdevice holds */
>> + sock_put(&tfile->sk);
>>
>> - put_net(tfile->net);
>> - kfree(tfile);
>> + }
>> +
>> + /* drop the reference that file holds */
>> + sock_put(&tfile->sk);
>>
>> return 0;
>> }
>> @@ -1676,13 +1685,14 @@ static void tun_cleanup(void)
>> struct socket *tun_get_socket(struct file *file)
>> {
>> struct tun_struct *tun;
>> + struct tun_file *tfile = file->private_data;
>> if (file->f_op !=&tun_fops)
>> return ERR_PTR(-EINVAL);
>> tun = tun_get(file);
>> if (!tun)
>> return ERR_PTR(-EBADFD);
>> tun_put(tun);
>> - return&tun->socket;
>> + return&tfile->socket;
>> }
>> EXPORT_SYMBOL_GPL(tun_get_socket);
>>
--
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