-
-static void macvtap_sock_write_space(struct sock *sk)
-{
- wait_queue_head_t *wqueue;
-
- if (!sock_writeable(sk) ||
- !test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags))
- return;
-
- wqueue = sk_sleep(sk);
- if (wqueue && waitqueue_active(wqueue))
- wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND);
-}
-
-static void macvtap_sock_destruct(struct sock *sk)
-{
- struct macvtap_queue *q = container_of(sk, struct macvtap_queue, sk);
-
- skb_array_cleanup(&q->skb_array);
-}
-
-static int macvtap_open(struct inode *inode, struct file *file)
-{
- struct net *net = current->nsproxy->net_ns;
- struct net_device *dev;
- struct macvtap_queue *q;
- int err = -ENODEV;
-
- rtnl_lock();
- dev = dev_get_by_macvtap_minor(iminor(inode));
- if (!dev)
- goto err;
-
- err = -ENOMEM;
- q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL,
- &macvtap_proto, 0);
- if (!q)
- goto err;
-
- RCU_INIT_POINTER(q->sock.wq, &q->wq);
- init_waitqueue_head(&q->wq.wait);
- q->sock.type = SOCK_RAW;
- q->sock.state = SS_CONNECTED;
- q->sock.file = file;
- q->sock.ops = &macvtap_socket_ops;
- sock_init_data(&q->sock, &q->sk);
- q->sk.sk_write_space = macvtap_sock_write_space;
- q->sk.sk_destruct = macvtap_sock_destruct;
- q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP;
- q->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
-
- /*
- * so far only KVM virtio_net uses macvtap, enable zero copy between
- * guest kernel and host kernel when lower device supports zerocopy
- *
- * The macvlan supports zerocopy iff the lower device supports zero
- * copy so we don't have to look at the lower device directly.
- */
- if ((dev->features & NETIF_F_HIGHDMA) && (dev->features & NETIF_F_SG))
- sock_set_flag(&q->sk, SOCK_ZEROCOPY);
-
- err = -ENOMEM;
- if (skb_array_init(&q->skb_array, dev->tx_queue_len, GFP_KERNEL))
- goto err_array;
-
- err = macvtap_set_queue(dev, file, q);
- if (err)
- goto err_queue;
-
- dev_put(dev);
-
- rtnl_unlock();
- return err;
-
-err_queue:
- skb_array_cleanup(&q->skb_array);
-err_array:
- sock_put(&q->sk);
-err:
- if (dev)
- dev_put(dev);
-
- rtnl_unlock();
- return err;
-}
-
-static int macvtap_release(struct inode *inode, struct file *file)
-{
- struct macvtap_queue *q = file->private_data;
- macvtap_put_queue(q);
- return 0;
-}
-
-static unsigned int macvtap_poll(struct file *file, poll_table * wait)
-{
- struct macvtap_queue *q = file->private_data;
- unsigned int mask = POLLERR;
-
- if (!q)
- goto out;
-
- mask = 0;
- poll_wait(file, &q->wq.wait, wait);
-
- if (!skb_array_empty(&q->skb_array))
- mask |= POLLIN | POLLRDNORM;
-
- if (sock_writeable(&q->sk) ||
- (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &q->sock.flags) &&
- sock_writeable(&q->sk)))
- mask |= POLLOUT | POLLWRNORM;
-
-out:
- return mask;
-}
-
-static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad,
- size_t len, size_t linear,
- int noblock, int *err)
-{
- struct sk_buff *skb;
-
- /* Under a page? Don't bother with paged skb. */
- if (prepad + len < PAGE_SIZE || !linear)
- linear = len;
-
- skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
- err, 0);
- if (!skb)
- return NULL;
-
- skb_reserve(skb, prepad);
- skb_put(skb, linear);
- skb->data_len = len - linear;
- skb->len += len - linear;
-
- return skb;
-}
-
-/* Neighbour code has some assumptions on HH_DATA_MOD alignment */
-#define MACVTAP_RESERVE HH_DATA_OFF(ETH_HLEN)
-
-/* Get packet from user space buffer */
-static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
- struct iov_iter *from, int noblock)
-{
- int good_linear = SKB_MAX_HEAD(MACVTAP_RESERVE);
- struct sk_buff *skb;
- struct macvlan_dev *vlan;
- unsigned long total_len = iov_iter_count(from);
- unsigned long len = total_len;
- int err;
- struct virtio_net_hdr vnet_hdr = { 0 };
- int vnet_hdr_len = 0;
- int copylen = 0;
- int depth;
- bool zerocopy = false;
- size_t linear;
-
- if (q->flags & IFF_VNET_HDR) {
- vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz);
-
- err = -EINVAL;
- if (len < vnet_hdr_len)
- goto err;
- len -= vnet_hdr_len;
-
- err = -EFAULT;
- if (!copy_from_iter_full(&vnet_hdr, sizeof(vnet_hdr), from))
- goto err;
- iov_iter_advance(from, vnet_hdr_len - sizeof(vnet_hdr));
- if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
- macvtap16_to_cpu(q, vnet_hdr.csum_start) +
- macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2 >
- macvtap16_to_cpu(q, vnet_hdr.hdr_len))
- vnet_hdr.hdr_len = cpu_to_macvtap16(q,
- macvtap16_to_cpu(q, vnet_hdr.csum_start) +
- macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2);
- err = -EINVAL;
- if (macvtap16_to_cpu(q, vnet_hdr.hdr_len) > len)
- goto err;
- }
-
- err = -EINVAL;
- if (unlikely(len < ETH_HLEN))
- goto err;
-
- if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) {
- struct iov_iter i;
-
- copylen = vnet_hdr.hdr_len ?
- macvtap16_to_cpu(q, vnet_hdr.hdr_len) : GOODCOPY_LEN;
- if (copylen > good_linear)
- copylen = good_linear;
- else if (copylen < ETH_HLEN)
- copylen = ETH_HLEN;
- linear = copylen;
- i = *from;
- iov_iter_advance(&i, copylen);
- if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS)
- zerocopy = true;
- }
-
- if (!zerocopy) {
- copylen = len;
- linear = macvtap16_to_cpu(q, vnet_hdr.hdr_len);
- if (linear > good_linear)
- linear = good_linear;
- else if (linear < ETH_HLEN)
- linear = ETH_HLEN;
- }
-
- skb = macvtap_alloc_skb(&q->sk, MACVTAP_RESERVE, copylen,
- linear, noblock, &err);
- if (!skb)
- goto err;
-
- if (zerocopy)
- err = zerocopy_sg_from_iter(skb, from);
- else
- err = skb_copy_datagram_from_iter(skb, 0, from, len);
-
- if (err)
- goto err_kfree;
-
- skb_set_network_header(skb, ETH_HLEN);
- skb_reset_mac_header(skb);
- skb->protocol = eth_hdr(skb)->h_proto;
-
- if (vnet_hdr_len) {
- err = virtio_net_hdr_to_skb(skb, &vnet_hdr,
- macvtap_is_little_endian(q));
- if (err)
- goto err_kfree;
- }
-
- skb_probe_transport_header(skb, ETH_HLEN);
-
- /* Move network header to the right position for VLAN tagged packets */
- if ((skb->protocol == htons(ETH_P_8021Q) ||
- skb->protocol == htons(ETH_P_8021AD)) &&
- __vlan_get_protocol(skb, skb->protocol, &depth) != 0)
- skb_set_network_header(skb, depth);
-
- rcu_read_lock();
- vlan = rcu_dereference(q->vlan);
- /* copy skb_ubuf_info for callback when skb has no error */
- if (zerocopy) {
- skb_shinfo(skb)->destructor_arg = m->msg_control;
- skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
- } else if (m && m->msg_control) {
- struct ubuf_info *uarg = m->msg_control;
- uarg->callback(uarg, false);
- }
-
- if (vlan) {
- skb->dev = vlan->dev;
- dev_queue_xmit(skb);
- } else {
- kfree_skb(skb);
- }
- rcu_read_unlock();
-
- return total_len;
-
-err_kfree:
- kfree_skb(skb);
-
-err:
- rcu_read_lock();
- vlan = rcu_dereference(q->vlan);
- if (vlan)
- this_cpu_inc(vlan->pcpu_stats->tx_dropped);
- rcu_read_unlock();
-
- return err;
-}
-
-static ssize_t macvtap_write_iter(struct kiocb *iocb, struct iov_iter *from)
-{
- struct file *file = iocb->ki_filp;
- struct macvtap_queue *q = file->private_data;
-
- return macvtap_get_user(q, NULL, from, file->f_flags & O_NONBLOCK);
-}
-
-/* Put packet to the user space buffer */
-static ssize_t macvtap_put_user(struct macvtap_queue *q,
- const struct sk_buff *skb,
- struct iov_iter *iter)
-{
- int ret;
- int vnet_hdr_len = 0;
- int vlan_offset = 0;
- int total;
-
- if (q->flags & IFF_VNET_HDR) {
- struct virtio_net_hdr vnet_hdr;
- vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz);
- if (iov_iter_count(iter) < vnet_hdr_len)
- return -EINVAL;
-
- if (virtio_net_hdr_from_skb(skb, &vnet_hdr,
- macvtap_is_little_endian(q), true))
- BUG();
-
- if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=
- sizeof(vnet_hdr))
- return -EFAULT;
-
- iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr));
- }
- total = vnet_hdr_len;
- total += skb->len;
-
- if (skb_vlan_tag_present(skb)) {
- struct {
- __be16 h_vlan_proto;
- __be16 h_vlan_TCI;
- } veth;
- veth.h_vlan_proto = skb->vlan_proto;
- veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb));
-
- vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto);
- total += VLAN_HLEN;
-
- ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset);
- if (ret || !iov_iter_count(iter))
- goto done;
-
- ret = copy_to_iter(&veth, sizeof(veth), iter);
- if (ret != sizeof(veth) || !iov_iter_count(iter))
- goto done;
- }
-
- ret = skb_copy_datagram_iter(skb, vlan_offset, iter,
- skb->len - vlan_offset);
-
-done:
- return ret ? ret : total;
-}
-
-static ssize_t macvtap_do_read(struct macvtap_queue *q,
- struct iov_iter *to,
- int noblock)
-{
- DEFINE_WAIT(wait);
- struct sk_buff *skb;
- ssize_t ret = 0;
-
- if (!iov_iter_count(to))
- return 0;
-
- while (1) {
- if (!noblock)
- prepare_to_wait(sk_sleep(&q->sk), &wait,
- TASK_INTERRUPTIBLE);
-
- /* Read frames from the queue */
- skb = skb_array_consume(&q->skb_array);
- if (skb)
- break;
- if (noblock) {
- ret = -EAGAIN;
- break;
- }
- if (signal_pending(current)) {
- ret = -ERESTARTSYS;
- break;
- }
- /* Nothing to read, let's sleep */
- schedule();
- }
- if (!noblock)
- finish_wait(sk_sleep(&q->sk), &wait);
-
- if (skb) {
- ret = macvtap_put_user(q, skb, to);
- if (unlikely(ret < 0))
- kfree_skb(skb);
- else
- consume_skb(skb);
- }
- return ret;
-}
-
-static ssize_t macvtap_read_iter(struct kiocb *iocb, struct iov_iter *to)
-{
- struct file *file = iocb->ki_filp;
- struct macvtap_queue *q = file->private_data;
- ssize_t len = iov_iter_count(to), ret;
-
- ret = macvtap_do_read(q, to, file->f_flags & O_NONBLOCK);
- ret = min_t(ssize_t, ret, len);
- if (ret > 0)
- iocb->ki_pos = ret;
- return ret;
-}
-
-static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q)
-{
- struct macvlan_dev *vlan;
-
- ASSERT_RTNL();
- vlan = rtnl_dereference(q->vlan);
- if (vlan)
- dev_hold(vlan->dev);
-
- return vlan;
-}
-
-static void macvtap_put_vlan(struct macvlan_dev *vlan)
-{
- dev_put(vlan->dev);
-}
-
-static int macvtap_ioctl_set_queue(struct file *file, unsigned int flags)
-{
- struct macvtap_queue *q = file->private_data;
- struct macvlan_dev *vlan;
- int ret;
-
- vlan = macvtap_get_vlan(q);
- if (!vlan)
- return -EINVAL;
-
- if (flags & IFF_ATTACH_QUEUE)
- ret = macvtap_enable_queue(vlan->dev, file, q);
- else if (flags & IFF_DETACH_QUEUE)
- ret = macvtap_disable_queue(q);
- else
- ret = -EINVAL;
-
- macvtap_put_vlan(vlan);
- return ret;
-}
-
-static int set_offload(struct macvtap_queue *q, unsigned long arg)
-{
- struct macvlan_dev *vlan;
- netdev_features_t features;
- netdev_features_t feature_mask = 0;
-
- vlan = rtnl_dereference(q->vlan);
- if (!vlan)
- return -ENOLINK;
-
- features = vlan->dev->features;
-
- if (arg & TUN_F_CSUM) {
- feature_mask = NETIF_F_HW_CSUM;
-
- if (arg & (TUN_F_TSO4 | TUN_F_TSO6)) {
- if (arg & TUN_F_TSO_ECN)
- feature_mask |= NETIF_F_TSO_ECN;
- if (arg & TUN_F_TSO4)
- feature_mask |= NETIF_F_TSO;
- if (arg & TUN_F_TSO6)
- feature_mask |= NETIF_F_TSO6;
- }
-
- if (arg & TUN_F_UFO)
- feature_mask |= NETIF_F_UFO;
- }
-
- /* tun/tap driver inverts the usage for TSO offloads, where
- * setting the TSO bit means that the userspace wants to
- * accept TSO frames and turning it off means that user space
- * does not support TSO.
- * For macvtap, we have to invert it to mean the same thing.
- * When user space turns off TSO, we turn off GSO/LRO so that
- * user-space will not receive TSO frames.
- */
- if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO))
- features |= RX_OFFLOADS;
- else
- features &= ~RX_OFFLOADS;
-
- /* tap_features are the same as features on tun/tap and
- * reflect user expectations.
- */
- vlan->tap_features = feature_mask;
- vlan->set_features = features;
- netdev_update_features(vlan->dev);
-
- return 0;
-}
-
-/*
- * provide compatibility with generic tun/tap interface
- */
-static long macvtap_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- struct macvtap_queue *q = file->private_data;
- struct macvlan_dev *vlan;
- void __user *argp = (void __user *)arg;
- struct ifreq __user *ifr = argp;
- unsigned int __user *up = argp;
- unsigned short u;
- int __user *sp = argp;
- struct sockaddr sa;
- int s;
- int ret;
-
- switch (cmd) {
- case TUNSETIFF:
- /* ignore the name, just look at flags */
- if (get_user(u, &ifr->ifr_flags))
- return -EFAULT;
-
- ret = 0;
- if ((u & ~MACVTAP_FEATURES) != (IFF_NO_PI | IFF_TAP))
- ret = -EINVAL;
- else
- q->flags = (q->flags & ~MACVTAP_FEATURES) | u;
-
- return ret;
-
- case TUNGETIFF:
- rtnl_lock();
- vlan = macvtap_get_vlan(q);
- if (!vlan) {
- rtnl_unlock();
- return -ENOLINK;
- }
-
- ret = 0;
- u = q->flags;
- if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
- put_user(u, &ifr->ifr_flags))
- ret = -EFAULT;
- macvtap_put_vlan(vlan);
- rtnl_unlock();
- return ret;
-
- case TUNSETQUEUE:
- if (get_user(u, &ifr->ifr_flags))
- return -EFAULT;
- rtnl_lock();
- ret = macvtap_ioctl_set_queue(file, u);
- rtnl_unlock();
- return ret;
-
- case TUNGETFEATURES:
- if (put_user(IFF_TAP | IFF_NO_PI | MACVTAP_FEATURES, up))
- return -EFAULT;
- return 0;
-
- case TUNSETSNDBUF:
- if (get_user(s, sp))
- return -EFAULT;
-
- q->sk.sk_sndbuf = s;
- return 0;
-
- case TUNGETVNETHDRSZ:
- s = q->vnet_hdr_sz;
- if (put_user(s, sp))
- return -EFAULT;
- return 0;
-
- case TUNSETVNETHDRSZ:
- if (get_user(s, sp))
- return -EFAULT;
- if (s < (int)sizeof(struct virtio_net_hdr))
- return -EINVAL;
-
- q->vnet_hdr_sz = s;
- return 0;
-
- case TUNGETVNETLE:
- s = !!(q->flags & MACVTAP_VNET_LE);
- if (put_user(s, sp))
- return -EFAULT;
- return 0;
-
- case TUNSETVNETLE:
- if (get_user(s, sp))
- return -EFAULT;
- if (s)
- q->flags |= MACVTAP_VNET_LE;
- else
- q->flags &= ~MACVTAP_VNET_LE;
- return 0;
-
- case TUNGETVNETBE:
- return macvtap_get_vnet_be(q, sp);
-
- case TUNSETVNETBE:
- return macvtap_set_vnet_be(q, sp);
-
- case TUNSETOFFLOAD:
- /* let the user check for future flags */
- if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |
- TUN_F_TSO_ECN | TUN_F_UFO))
- return -EINVAL;
-
- rtnl_lock();
- ret = set_offload(q, arg);
- rtnl_unlock();
- return ret;
-
- case SIOCGIFHWADDR:
- rtnl_lock();
- vlan = macvtap_get_vlan(q);
- if (!vlan) {
- rtnl_unlock();
- return -ENOLINK;
- }
- ret = 0;
- u = vlan->dev->type;
- if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
- copy_to_user(&ifr->ifr_hwaddr.sa_data, vlan->dev->dev_addr, ETH_ALEN) ||
- put_user(u, &ifr->ifr_hwaddr.sa_family))
- ret = -EFAULT;
- macvtap_put_vlan(vlan);
- rtnl_unlock();
- return ret;
-
- case SIOCSIFHWADDR:
- if (copy_from_user(&sa, &ifr->ifr_hwaddr, sizeof(sa)))
- return -EFAULT;
- rtnl_lock();
- vlan = macvtap_get_vlan(q);
- if (!vlan) {
- rtnl_unlock();
- return -ENOLINK;
- }
- ret = dev_set_mac_address(vlan->dev, &sa);
- macvtap_put_vlan(vlan);
- rtnl_unlock();
- return ret;
-
- default:
- return -EINVAL;
- }
-}
-
-#ifdef CONFIG_COMPAT
-static long macvtap_compat_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
-}
-#endif
-
-static const struct file_operations macvtap_fops = {
- .owner = THIS_MODULE,
- .open = macvtap_open,
- .release = macvtap_release,
- .read_iter = macvtap_read_iter,
- .write_iter = macvtap_write_iter,
- .poll = macvtap_poll,
- .llseek = no_llseek,
- .unlocked_ioctl = macvtap_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = macvtap_compat_ioctl,
-#endif
-};
-
-static int macvtap_sendmsg(struct socket *sock, struct msghdr *m,
- size_t total_len)
-{
- struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock);
- return macvtap_get_user(q, m, &m->msg_iter, m->msg_flags & MSG_DONTWAIT);
-}
-
-static int macvtap_recvmsg(struct socket *sock, struct msghdr *m,
- size_t total_len, int flags)
-{
- struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock);
- int ret;
- if (flags & ~(MSG_DONTWAIT|MSG_TRUNC))
- return -EINVAL;
- ret = macvtap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT);
- if (ret > total_len) {
- m->msg_flags |= MSG_TRUNC;
- ret = flags & MSG_TRUNC ? ret : total_len;
- }
- return ret;
-}
-
-static int macvtap_peek_len(struct socket *sock)
-{
- struct macvtap_queue *q = container_of(sock, struct macvtap_queue,
- sock);
- return skb_array_peek_len(&q->skb_array);
-}
-
-/* Ops structure to mimic raw sockets with tun */
-static const struct proto_ops macvtap_socket_ops = {
- .sendmsg = macvtap_sendmsg,
- .recvmsg = macvtap_recvmsg,
- .peek_len = macvtap_peek_len,
-};
-
-/* Get an underlying socket object from tun file. Returns error unless file is
- * attached to a device. The returned object works like a packet socket, it
- * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for
- * holding a reference to the file for as long as the socket is in use. */
-struct socket *macvtap_get_socket(struct file *file)
-{
- struct macvtap_queue *q;
- if (file->f_op != &macvtap_fops)
- return ERR_PTR(-EINVAL);
- q = file->private_data;
- if (!q)
- return ERR_PTR(-EBADFD);
- return &q->sock;
-}
-EXPORT_SYMBOL_GPL(macvtap_get_socket);
-
-static int macvtap_queue_resize(struct macvlan_dev *vlan)
-{
- struct net_device *dev = vlan->dev;
- struct macvtap_queue *q;
- struct skb_array **arrays;
- int n = vlan->numqueues;
- int ret, i = 0;
-
- arrays = kmalloc(sizeof *arrays * n, GFP_KERNEL);
- if (!arrays)
- return -ENOMEM;
-
- list_for_each_entry(q, &vlan->queue_list, next)
- arrays[i++] = &q->skb_array;
-
- ret = skb_array_resize_multiple(arrays, n,
- dev->tx_queue_len, GFP_KERNEL);
-
- kfree(arrays);
- return ret;
-}
-