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Release 4.10 drivers/net/macvtap.c

Directory: drivers/net
#include <linux/etherdevice.h>
#include <linux/if_macvlan.h>
#include <linux/if_vlan.h>
#include <linux/interrupt.h>
#include <linux/nsproxy.h>
#include <linux/compat.h>
#include <linux/if_tun.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/cdev.h>
#include <linux/idr.h>
#include <linux/fs.h>
#include <linux/uio.h>

#include <net/net_namespace.h>
#include <net/rtnetlink.h>
#include <net/sock.h>
#include <linux/virtio_net.h>
#include <linux/skb_array.h>

/*
 * A macvtap queue is the central object of this driver, it connects
 * an open character device to a macvlan interface. There can be
 * multiple queues on one interface, which map back to queues
 * implemented in hardware on the underlying device.
 *
 * macvtap_proto is used to allocate queues through the sock allocation
 * mechanism.
 *
 */

struct macvtap_queue {
	
struct sock sk;
	
struct socket sock;
	
struct socket_wq wq;
	
int vnet_hdr_sz;
	
struct macvlan_dev __rcu *vlan;
	
struct file *file;
	
unsigned int flags;
	
u16 queue_index;
	
bool enabled;
	
struct list_head next;
	
struct skb_array skb_array;
};


#define MACVTAP_FEATURES (IFF_VNET_HDR | IFF_MULTI_QUEUE)


#define MACVTAP_VNET_LE 0x80000000

#define MACVTAP_VNET_BE 0x40000000

#ifdef CONFIG_TUN_VNET_CROSS_LE

static inline bool macvtap_legacy_is_little_endian(struct macvtap_queue *q) { return q->flags & MACVTAP_VNET_BE ? false : virtio_legacy_is_little_endian(); }

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static long macvtap_get_vnet_be(struct macvtap_queue *q, int __user *sp) { int s = !!(q->flags & MACVTAP_VNET_BE); if (put_user(s, sp)) return -EFAULT; return 0; }

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static long macvtap_set_vnet_be(struct macvtap_queue *q, int __user *sp) { int s; if (get_user(s, sp)) return -EFAULT; if (s) q->flags |= MACVTAP_VNET_BE; else q->flags &= ~MACVTAP_VNET_BE; return 0; }

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#else
static inline bool macvtap_legacy_is_little_endian(struct macvtap_queue *q) { return virtio_legacy_is_little_endian(); }

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static long macvtap_get_vnet_be(struct macvtap_queue *q, int __user *argp) { return -EINVAL; }

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static long macvtap_set_vnet_be(struct macvtap_queue *q, int __user *argp) { return -EINVAL; }

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#endif /* CONFIG_TUN_VNET_CROSS_LE */
static inline bool macvtap_is_little_endian(struct macvtap_queue *q) { return q->flags & MACVTAP_VNET_LE || macvtap_legacy_is_little_endian(q); }

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static inline u16 macvtap16_to_cpu(struct macvtap_queue *q, __virtio16 val) { return __virtio16_to_cpu(macvtap_is_little_endian(q), val); }

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static inline __virtio16 cpu_to_macvtap16(struct macvtap_queue *q, u16 val) { return __cpu_to_virtio16(macvtap_is_little_endian(q), val); }

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static struct proto macvtap_proto = { .name = "macvtap", .owner = THIS_MODULE, .obj_size = sizeof (struct macvtap_queue), }; /* * Variables for dealing with macvtaps device numbers. */ static dev_t macvtap_major; #define MACVTAP_NUM_DEVS (1U << MINORBITS) static DEFINE_MUTEX(minor_lock); static DEFINE_IDR(minor_idr); #define GOODCOPY_LEN 128
static const void *macvtap_net_namespace(struct device *d) { struct net_device *dev = to_net_dev(d->parent); return dev_net(dev); }

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static struct class macvtap_class = { .name = "macvtap", .owner = THIS_MODULE, .ns_type = &net_ns_type_operations, .namespace = macvtap_net_namespace, }; static struct cdev macvtap_cdev; static const struct proto_ops macvtap_socket_ops; #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \ NETIF_F_TSO6 | NETIF_F_UFO) #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO) #define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST)
static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev) { return rcu_dereference(dev->rx_handler_data); }

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/* * RCU usage: * The macvtap_queue and the macvlan_dev are loosely coupled, the * pointers from one to the other can only be read while rcu_read_lock * or rtnl is held. * * Both the file and the macvlan_dev hold a reference on the macvtap_queue * through sock_hold(&q->sk). When the macvlan_dev goes away first, * q->vlan becomes inaccessible. When the files gets closed, * macvtap_get_queue() fails. * * There may still be references to the struct sock inside of the * queue from outbound SKBs, but these never reference back to the * file or the dev. The data structure is freed through __sk_free * when both our references and any pending SKBs are gone. */
static int macvtap_enable_queue(struct net_device *dev, struct file *file, struct macvtap_queue *q) { struct macvlan_dev *vlan = netdev_priv(dev); int err = -EINVAL; ASSERT_RTNL(); if (q->enabled) goto out; err = 0; rcu_assign_pointer(vlan->taps[vlan->numvtaps], q); q->queue_index = vlan->numvtaps; q->enabled = true; vlan->numvtaps++; out: return err; }

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/* Requires RTNL */
static int macvtap_set_queue(struct net_device *dev, struct file *file, struct macvtap_queue *q) { struct macvlan_dev *vlan = netdev_priv(dev); if (vlan->numqueues == MAX_MACVTAP_QUEUES) return -EBUSY; rcu_assign_pointer(q->vlan, vlan); rcu_assign_pointer(vlan->taps[vlan->numvtaps], q); sock_hold(&q->sk); q->file = file; q->queue_index = vlan->numvtaps; q->enabled = true; file->private_data = q; list_add_tail(&q->next, &vlan->queue_list); vlan->numvtaps++; vlan->numqueues++; return 0; }

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static int macvtap_disable_queue(struct macvtap_queue *q) { struct macvlan_dev *vlan; struct macvtap_queue *nq; ASSERT_RTNL(); if (!q->enabled) return -EINVAL; vlan = rtnl_dereference(q->vlan); if (vlan) { int index = q->queue_index; BUG_ON(index >= vlan->numvtaps); nq = rtnl_dereference(vlan->taps[vlan->numvtaps - 1]); nq->queue_index = index; rcu_assign_pointer(vlan->taps[index], nq); RCU_INIT_POINTER(vlan->taps[vlan->numvtaps - 1], NULL); q->enabled = false; vlan->numvtaps--; } return 0; }

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/* * The file owning the queue got closed, give up both * the reference that the files holds as well as the * one from the macvlan_dev if that still exists. * * Using the spinlock makes sure that we don't get * to the queue again after destroying it. */
static void macvtap_put_queue(struct macvtap_queue *q) { struct macvlan_dev *vlan; rtnl_lock(); vlan = rtnl_dereference(q->vlan); if (vlan) { if (q->enabled) BUG_ON(macvtap_disable_queue(q)); vlan->numqueues--; RCU_INIT_POINTER(q->vlan, NULL); sock_put(&q->sk); list_del_init(&q->next); } rtnl_unlock(); synchronize_rcu(); sock_put(&q->sk); }

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/* * Select a queue based on the rxq of the device on which this packet * arrived. If the incoming device is not mq, calculate a flow hash * to select a queue. If all fails, find the first available queue. * Cache vlan->numvtaps since it can become zero during the execution * of this function. */
static struct macvtap_queue *macvtap_get_queue(struct net_device *dev, struct sk_buff *skb) { struct macvlan_dev *vlan = netdev_priv(dev); struct macvtap_queue *tap = NULL; /* Access to taps array is protected by rcu, but access to numvtaps * isn't. Below we use it to lookup a queue, but treat it as a hint * and validate that the result isn't NULL - in case we are * racing against queue removal. */ int numvtaps = ACCESS_ONCE(vlan->numvtaps); __u32 rxq; if (!numvtaps) goto out; if (numvtaps == 1) goto single; /* Check if we can use flow to select a queue */ rxq = skb_get_hash(skb); if (rxq) { tap = rcu_dereference(vlan->taps[rxq % numvtaps]); goto out; } if (likely(skb_rx_queue_recorded(skb))) { rxq = skb_get_rx_queue(skb); while (unlikely(rxq >= numvtaps)) rxq -= numvtaps; tap = rcu_dereference(vlan->taps[rxq]); goto out; } single: tap = rcu_dereference(vlan->taps[0]); out: return tap; }

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/* * The net_device is going away, give up the reference * that it holds on all queues and safely set the pointer * from the queues to NULL. */
static void macvtap_del_queues(struct net_device *dev) { struct macvlan_dev *vlan = netdev_priv(dev); struct macvtap_queue *q, *tmp; ASSERT_RTNL(); list_for_each_entry_safe(q, tmp, &vlan->queue_list, next) { list_del_init(&q->next); RCU_INIT_POINTER(q->vlan, NULL); if (q->enabled) vlan->numvtaps--; vlan->numqueues--; sock_put(&q->sk); } BUG_ON(vlan->numvtaps); BUG_ON(vlan->numqueues); /* guarantee that any future macvtap_set_queue will fail */ vlan->numvtaps = MAX_MACVTAP_QUEUES; }

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static rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb) { struct sk_buff *skb = *pskb; struct net_device *dev = skb->dev; struct macvlan_dev *vlan; struct macvtap_queue *q; netdev_features_t features = TAP_FEATURES; vlan = macvtap_get_vlan_rcu(dev); if (!vlan) return RX_HANDLER_PASS; q = macvtap_get_queue(dev, skb); if (!q) return RX_HANDLER_PASS; if (__skb_array_full(&q->skb_array)) goto drop; skb_push(skb, ETH_HLEN); /* Apply the forward feature mask so that we perform segmentation * according to users wishes. This only works if VNET_HDR is * enabled. */ if (q->flags & IFF_VNET_HDR) features |= vlan->tap_features; if (netif_needs_gso(skb, features)) { struct sk_buff *segs = __skb_gso_segment(skb, features, false); if (IS_ERR(segs)) goto drop; if (!segs) { if (skb_array_produce(&q->skb_array, skb)) goto drop; goto wake_up; } consume_skb(skb); while (segs) { struct sk_buff *nskb = segs->next; segs->next = NULL; if (skb_array_produce(&q->skb_array, segs)) { kfree_skb(segs); kfree_skb_list(nskb); break; } segs = nskb; } } else { /* If we receive a partial checksum and the tap side * doesn't support checksum offload, compute the checksum. * Note: it doesn't matter which checksum feature to * check, we either support them all or none. */ if (skb->ip_summed == CHECKSUM_PARTIAL && !(features & NETIF_F_CSUM_MASK) && skb_checksum_help(skb)) goto drop; if (skb_array_produce(&q->skb_array, skb)) goto drop; } wake_up: wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND); return RX_HANDLER_CONSUMED; drop: /* Count errors/drops only here, thus don't care about args. */ macvlan_count_rx(vlan, 0, 0, 0); kfree_skb(skb); return RX_HANDLER_CONSUMED; }

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static int macvtap_get_minor(struct macvlan_dev *vlan) { int retval = -ENOMEM; mutex_lock(&minor_lock); retval = idr_alloc(&minor_idr, vlan, 1, MACVTAP_NUM_DEVS, GFP_KERNEL); if (retval >= 0) { vlan->minor = retval; } else if (retval == -ENOSPC) { netdev_err(vlan->dev, "Too many macvtap devices\n"); retval = -EINVAL; } mutex_unlock(&minor_lock); return retval < 0 ? retval : 0; }

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static void macvtap_free_minor(struct macvlan_dev *vlan) { mutex_lock(&minor_lock); if (vlan->minor) { idr_remove(&minor_idr, vlan->minor); vlan->minor = 0; } mutex_unlock(&minor_lock); }

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static struct net_device *dev_get_by_macvtap_minor(int minor) { struct net_device *dev = NULL; struct macvlan_dev *vlan; mutex_lock(&minor_lock); vlan = idr_find(&minor_idr, minor); if (vlan) { dev = vlan->dev; dev_hold(dev); } mutex_unlock(&minor_lock); return dev; }

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static int macvtap_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { struct macvlan_dev *vlan = netdev_priv(dev); int err; INIT_LIST_HEAD(&vlan->queue_list); /* Since macvlan supports all offloads by default, make * tap support all offloads also. */ vlan->tap_features = TUN_OFFLOADS; err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan); if (err) return err; /* Don't put anything that may fail after macvlan_common_newlink * because we can't undo what it does. */ err = macvlan_common_newlink(src_net, dev, tb, data); if (err) { netdev_rx_handler_unregister(dev); return err; } return 0; }

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static void macvtap_dellink(struct net_device *dev, struct list_head *head) { netdev_rx_handler_unregister(dev); macvtap_del_queues(dev); macvlan_dellink(dev, head); }

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static void macvtap_setup(struct net_device *dev) { macvlan_common_setup(dev); dev->tx_queue_len = TUN_READQ_SIZE; }

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static struct rtnl_link_ops macvtap_link_ops __read_mostly = { .kind = "macvtap", .setup = macvtap_setup, .newlink = macvtap_newlink, .dellink = macvtap_dellink, };
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); }

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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); }

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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; }

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static int macvtap_release(struct inode *inode, struct file *file) { struct macvtap_queue *q = file->private_data; macvtap_put_queue(q); return 0; }

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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; }

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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; }

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Total113100.00%4100.00%

/* 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; }

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PersonTokensPropCommitsCommitProp
arnd bergmannarnd bergmann30542.30%311.11%
jason wangjason wang11616.09%933.33%
shirley mashirley ma7610.54%13.70%
al viroal viro577.91%27.41%
michael s. tsirkinmichael s. tsirkin527.21%27.41%
ivan veceraivan vecera476.52%13.70%
willem de bruijnwillem de bruijn283.88%27.41%
vlad yasevichvlad yasevich131.80%27.41%
pravin b shelarpravin b shelar91.25%13.70%
eric dumazeteric dumazet70.97%27.41%
mike rapoportmike rapoport60.83%13.70%
nicolas kaisernicolas kaiser50.69%13.70%
Total721100.00%27100.00%


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); }

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arnd bergmannarnd bergmann4284.00%250.00%
al viroal viro510.00%125.00%
shirley mashirley ma36.00%125.00%
Total50100.00%4100.00%

/* 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; }

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PersonTokensPropCommitsCommitProp
basil gorbasil gor9534.05%17.69%
arnd bergmannarnd bergmann8931.90%215.38%
herbert xuherbert xu4114.70%17.69%
jason wangjason wang3111.11%430.77%
mike rapoportmike rapoport93.23%17.69%
michael s. tsirkinmichael s. tsirkin72.51%17.69%
willem de bruijnwillem de bruijn31.08%17.69%
jarno rajahalmejarno rajahalme20.72%17.69%
jiri pirkojiri pirko20.72%17.69%
Total279100.00%13100.00%


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; }

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PersonTokensPropCommitsCommitProp
arnd bergmannarnd bergmann10659.55%222.22%
al viroal viro2111.80%111.11%
jason wangjason wang2011.24%333.33%
vlad yasevichvlad yasevich1910.67%111.11%
hong zhi guohong zhi guo84.49%111.11%
eric dumazeteric dumazet42.25%111.11%
Total178100.00%9100.00%


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; }

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arnd bergmannarnd bergmann5463.53%240.00%
zhi yong wuzhi yong wu1214.12%120.00%
david s. millerdavid s. miller1112.94%120.00%
al viroal viro89.41%120.00%
Total85100.00%5100.00%


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; }

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PersonTokensPropCommitsCommitProp
jason wangjason wang4295.45%150.00%
vlad yasevichvlad yasevich24.55%150.00%
Total44100.00%2100.00%


static void macvtap_put_vlan(struct macvlan_dev *vlan) { dev_put(vlan->dev); }

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jason wangjason wang18100.00%1100.00%
Total18100.00%1100.00%


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; }

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jason wangjason wang95100.00%2100.00%
Total95100.00%2100.00%


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; }

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vlad yasevichvlad yasevich164100.00%2100.00%
Total164100.00%2100.00%

/* * 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; } }

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arnd bergmannarnd bergmann26337.63%317.65%
justin cormackjustin cormack17925.61%211.76%
michael s. tsirkinmichael s. tsirkin16723.89%529.41%
vlad yasevichvlad yasevich385.44%317.65%
jason wangjason wang304.29%317.65%
greg kurzgreg kurz223.15%15.88%
Total699100.00%17100.00%

#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)); }

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arnd bergmannarnd bergmann36100.00%1100.00%
Total36100.00%1100.00%

#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); }

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arnd bergmannarnd bergmann4686.79%125.00%
shirley mashirley ma59.43%125.00%
al viroal viro23.77%250.00%
Total53100.00%4100.00%


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; }

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arnd bergmannarnd bergmann7273.47%125.00%
david s. millerdavid s. miller2424.49%125.00%
al viroal viro22.04%250.00%
Total98100.00%4100.00%


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); }

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jason wangjason wang35100.00%1100.00%
Total35100.00%1100.00%

/* 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; }

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arnd bergmannarnd bergmann57100.00%1100.00%
Total57100.00%1100.00%

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; }

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jason wangjason wang109100.00%1100.00%
Total109100.00%1100.00%


static int macvtap_device_event(struct notifier_block *unused, unsigned long event, void *ptr) { struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct macvlan_dev *vlan; struct device *classdev; dev_t devt; int err; char tap_name[IFNAMSIZ]; if (dev->rtnl_link_ops != &macvtap_link_ops) return NOTIFY_DONE; snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex); vlan = netdev_priv(dev); switch (event) { case NETDEV_REGISTER: /* Create the device node here after the network device has * been registered but before register_netdevice has * finished running. */ err = macvtap_get_minor(vlan); if (err) return notifier_from_errno(err); devt = MKDEV(MAJOR(macvtap_major), vlan->minor); classdev = device_create(&macvtap_class, &dev->dev, devt, dev, tap_name); if (IS_ERR(classdev)) { macvtap_free_minor(vlan); return notifier_from_errno(PTR_ERR(classdev)); } err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj, tap_name); if (err) return notifier_from_errno(err); break; case NETDEV_UNREGISTER: /* vlan->minor == 0 if NETDEV_REGISTER above failed */ if (vlan->minor == 0) break; sysfs_remove_link(&dev->dev.kobj, tap_name); devt = MKDEV(MAJOR(macvtap_major), vlan->minor); device_destroy(&macvtap_class, devt); macvtap_free_minor(vlan); break; case NETDEV_CHANGE_TX_QUEUE_LEN: if (macvtap_queue_resize(vlan)) return NOTIFY_BAD; break; } return NOTIFY_DONE; }

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eric w. biedermaneric w. biederman17666.17%233.33%
marc angelmarc angel6323.68%116.67%
jason wangjason wang145.26%116.67%
francesco ruggerifrancesco ruggeri103.76%116.67%
jiri pirkojiri pirko31.13%116.67%
Total266100.00%6100.00%

static struct notifier_block macvtap_notifier_block __read_mostly = { .notifier_call = macvtap_device_event, };
static int macvtap_init(void) { int err; err = alloc_chrdev_region(&macvtap_major, 0, MACVTAP_NUM_DEVS, "macvtap"); if (err) goto out1; cdev_init(&macvtap_cdev, &macvtap_fops); err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS); if (err) goto out2; err = class_register(&macvtap_class); if (err) goto out3; err = register_netdevice_notifier(&macvtap_notifier_block); if (err) goto out4; err = macvlan_link_register(&macvtap_link_ops); if (err) goto out5; return 0; out5: unregister_netdevice_notifier(&macvtap_notifier_block); out4: class_unregister(&macvtap_class); out3: cdev_del(&macvtap_cdev); out2: unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); out1: return err; }

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arnd bergmannarnd bergmann11679.45%133.33%
eric w. biedermaneric w. biederman2416.44%133.33%
marc angelmarc angel64.11%133.33%
Total146100.00%3100.00%

module_init(macvtap_init);
static void macvtap_exit(void) { rtnl_link_unregister(&macvtap_link_ops); unregister_netdevice_notifier(&macvtap_notifier_block); class_unregister(&macvtap_class); cdev_del(&macvtap_cdev); unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); idr_destroy(&minor_idr); }

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arnd bergmannarnd bergmann3271.11%125.00%
johannes thumshirnjohannes thumshirn613.33%125.00%
eric w. biedermaneric w. biederman613.33%125.00%
marc angelmarc angel12.22%125.00%
Total45100.00%4100.00%

module_exit(macvtap_exit); MODULE_ALIAS_RTNL_LINK("macvtap"); MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); MODULE_LICENSE("GPL");

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arnd bergmannarnd bergmann229838.51%54.85%
jason wangjason wang99616.69%2726.21%
vlad yasevichvlad yasevich5519.23%1110.68%
eric w. biedermaneric w. biederman4477.49%65.83%
michael s. tsirkinmichael s. tsirkin2934.91%54.85%
greg kurzgreg kurz2424.05%32.91%
justin cormackjustin cormack1793.00%21.94%
krishna kumarkrishna kumar1372.30%21.94%
marc angelmarc angel1242.08%10.97%
shirley mashirley ma1141.91%10.97%
al viroal viro1021.71%54.85%
basil gorbasil gor981.64%10.97%
herbert xuherbert xu881.47%21.94%
eric dumazeteric dumazet580.97%109.71%
ivan veceraivan vecera470.79%10.97%
david s. millerdavid s. miller360.60%21.94%
willem de bruijnwillem de bruijn310.52%21.94%
tejun heotejun heo230.39%21.94%
gao fenggao feng190.32%10.97%
mike rapoportmike rapoport150.25%10.97%
zhi yong wuzhi yong wu120.20%10.97%
francesco ruggerifrancesco ruggeri100.17%10.97%
pravin b shelarpravin b shelar90.15%10.97%
hong zhi guohong zhi guo80.13%10.97%
zhang shengjuzhang shengju60.10%10.97%
johannes thumshirnjohannes thumshirn60.10%10.97%
pankaj guptapankaj gupta50.08%10.97%
nicolas kaisernicolas kaiser50.08%10.97%
jiri pirkojiri pirko50.08%21.94%
tom herberttom herbert20.03%21.94%
jarno rajahalmejarno rajahalme20.03%10.97%
Total5968100.00%103100.00%
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