cregit-Linux how code gets into the kernel

Release 4.10 drivers/net/tun.c

Directory: drivers/net
/*
 *  TUN - Universal TUN/TAP device driver.
 *  Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 *
 *  $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $
 */

/*
 *  Changes:
 *
 *  Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
 *    Add TUNSETLINK ioctl to set the link encapsulation
 *
 *  Mark Smith <markzzzsmith@yahoo.com.au>
 *    Use eth_random_addr() for tap MAC address.
 *
 *  Harald Roelle <harald.roelle@ifi.lmu.de>  2004/04/20
 *    Fixes in packet dropping, queue length setting and queue wakeup.
 *    Increased default tx queue length.
 *    Added ethtool API.
 *    Minor cleanups
 *
 *  Daniel Podlejski <underley@underley.eu.org>
 *    Modifications for 2.3.99-pre5 kernel.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt


#define DRV_NAME	"tun"

#define DRV_VERSION	"1.6"

#define DRV_DESCRIPTION	"Universal TUN/TAP device driver"

#define DRV_COPYRIGHT	"(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/miscdevice.h>
#include <linux/ethtool.h>
#include <linux/rtnetlink.h>
#include <linux/compat.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/if_vlan.h>
#include <linux/crc32.h>
#include <linux/nsproxy.h>
#include <linux/virtio_net.h>
#include <linux/rcupdate.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
#include <net/sock.h>
#include <linux/seq_file.h>
#include <linux/uio.h>
#include <linux/skb_array.h>

#include <linux/uaccess.h>

/* Uncomment to enable debugging */
/* #define TUN_DEBUG 1 */

#ifdef TUN_DEBUG

static int debug;


#define tun_debug(level, tun, fmt, args...)			\
do {                                                            \
        if (tun->debug)                                         \
                netdev_printk(level, tun->dev, fmt, ##args);    \
} while (0)

#define DBG1(level, fmt, args...)				\
do {                                                            \
        if (debug == 2)                                         \
                printk(level fmt, ##args);                      \
} while (0)
#else

#define tun_debug(level, tun, fmt, args...)			\
do {                                                            \
        if (0)                                                  \
                netdev_printk(level, tun->dev, fmt, ##args);    \
} while (0)

#define DBG1(level, fmt, args...)				\
do {                                                            \
        if (0)                                                  \
                printk(level fmt, ##args);                      \
} while (0)
#endif

/* TUN device flags */

/* IFF_ATTACH_QUEUE is never stored in device flags,
 * overload it to mean fasync when stored there.
 */

#define TUN_FASYNC	IFF_ATTACH_QUEUE
/* High bits in flags field are unused. */

#define TUN_VNET_LE     0x80000000

#define TUN_VNET_BE     0x40000000


#define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \
                      IFF_MULTI_QUEUE)

#define GOODCOPY_LEN 128


#define FLT_EXACT_COUNT 8

struct tap_filter {
	
unsigned int    count;    /* Number of addrs. Zero means disabled */
	
u32             mask[2];  /* Mask of the hashed addrs */
	
unsigned char	addr[FLT_EXACT_COUNT][ETH_ALEN];
};

/* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal
 * to max number of VCPUs in guest. */

#define MAX_TAP_QUEUES 256

#define MAX_TAP_FLOWS  4096


#define TUN_FLOW_EXPIRE (3 * HZ)


struct tun_pcpu_stats {
	
u64 rx_packets;
	
u64 rx_bytes;
	
u64 tx_packets;
	
u64 tx_bytes;
	
struct u64_stats_sync syncp;
	
u32 rx_dropped;
	
u32 tx_dropped;
	
u32 rx_frame_errors;
};

/* A tun_file connects an open character device to a tuntap netdevice. It
 * also contains all socket related structures (except sock_fprog and tap_filter)
 * to serve as one transmit queue for tuntap device. The sock_fprog and
 * tap_filter were kept in tun_struct since they were used for filtering for the
 * netdevice not for a specific queue (at least I didn't see the requirement for
 * this).
 *
 * RCU usage:
 * The tun_file and tun_struct are loosely coupled, the pointer from one to the
 * other can only be read while rcu_read_lock or rtnl_lock is held.
 */

struct tun_file {
	
struct sock sk;
	
struct socket socket;
	
struct socket_wq wq;
	
struct tun_struct __rcu *tun;
	
struct fasync_struct *fasync;
	/* only used for fasnyc */
	
unsigned int flags;
	union {
		
u16 queue_index;
		
unsigned int ifindex;
	};
	
struct list_head next;
	
struct tun_struct *detached;
	
struct skb_array tx_array;
};


struct tun_flow_entry {
	
struct hlist_node hash_link;
	
struct rcu_head rcu;
	
struct tun_struct *tun;

	
u32 rxhash;
	
u32 rps_rxhash;
	
int queue_index;
	
unsigned long updated;
};


#define TUN_NUM_FLOW_ENTRIES 1024

/* Since the socket were moved to tun_file, to preserve the behavior of persist
 * device, socket filter, sndbuf and vnet header size were restore when the
 * file were attached to a persist device.
 */

struct tun_struct {
	
struct tun_file __rcu	*tfiles[MAX_TAP_QUEUES];
	
unsigned int            numqueues;
	
unsigned int 		flags;
	
kuid_t			owner;
	
kgid_t			group;

	
struct net_device	*dev;
	
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)

	
int			align;
	
int			vnet_hdr_sz;
	
int			sndbuf;
	
struct tap_filter	txflt;
	
struct sock_fprog	fprog;
	/* protected by rtnl lock */
	
bool			filter_attached;
#ifdef TUN_DEBUG
	
int debug;
#endif
	
spinlock_t lock;
	
struct hlist_head flows[TUN_NUM_FLOW_ENTRIES];
	
struct timer_list flow_gc_timer;
	
unsigned long ageing_time;
	
unsigned int numdisabled;
	
struct list_head disabled;
	
void *security;
	
u32 flow_count;
	
struct tun_pcpu_stats __percpu *pcpu_stats;
};

#ifdef CONFIG_TUN_VNET_CROSS_LE

static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) { return tun->flags & TUN_VNET_BE ? false : virtio_legacy_is_little_endian(); }

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static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) { int be = !!(tun->flags & TUN_VNET_BE); if (put_user(be, argp)) return -EFAULT; return 0; }

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static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) { int be; if (get_user(be, argp)) return -EFAULT; if (be) tun->flags |= TUN_VNET_BE; else tun->flags &= ~TUN_VNET_BE; return 0; }

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#else
static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) { return virtio_legacy_is_little_endian(); }

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static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) { return -EINVAL; }

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static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) { return -EINVAL; }

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#endif /* CONFIG_TUN_VNET_CROSS_LE */
static inline bool tun_is_little_endian(struct tun_struct *tun) { return tun->flags & TUN_VNET_LE || tun_legacy_is_little_endian(tun); }

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static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) { return __virtio16_to_cpu(tun_is_little_endian(tun), val); }

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static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) { return __cpu_to_virtio16(tun_is_little_endian(tun), val); }

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static inline u32 tun_hashfn(u32 rxhash) { return rxhash & 0x3ff; }

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static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) { struct tun_flow_entry *e; hlist_for_each_entry_rcu(e, head, hash_link) { if (e->rxhash == rxhash) return e; } return NULL; }

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static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, struct hlist_head *head, u32 rxhash, u16 queue_index) { struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); if (e) { tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", rxhash, queue_index); e->updated = jiffies; e->rxhash = rxhash; e->rps_rxhash = 0; e->queue_index = queue_index; e->tun = tun; hlist_add_head_rcu(&e->hash_link, head); ++tun->flow_count; } return e; }

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static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) { tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", e->rxhash, e->queue_index); hlist_del_rcu(&e->hash_link); kfree_rcu(e, rcu); --tun->flow_count; }

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static void tun_flow_flush(struct tun_struct *tun) { int i; spin_lock_bh(&tun->lock); for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { struct tun_flow_entry *e; struct hlist_node *n; hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) tun_flow_delete(tun, e); } spin_unlock_bh(&tun->lock); }

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static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) { int i; spin_lock_bh(&tun->lock); for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { struct tun_flow_entry *e; struct hlist_node *n; hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { if (e->queue_index == queue_index) tun_flow_delete(tun, e); } } spin_unlock_bh(&tun->lock); }

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static void tun_flow_cleanup(unsigned long data) { struct tun_struct *tun = (struct tun_struct *)data; unsigned long delay = tun->ageing_time; unsigned long next_timer = jiffies + delay; unsigned long count = 0; int i; tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); spin_lock_bh(&tun->lock); for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { struct tun_flow_entry *e; struct hlist_node *n; hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { unsigned long this_timer; count++; this_timer = e->updated + delay; if (time_before_eq(this_timer, jiffies)) tun_flow_delete(tun, e); else if (time_before(this_timer, next_timer)) next_timer = this_timer; } } if (count) mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); spin_unlock_bh(&tun->lock); }

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static void tun_flow_update(struct tun_struct *tun, u32 rxhash, struct tun_file *tfile) { struct hlist_head *head; struct tun_flow_entry *e; unsigned long delay = tun->ageing_time; u16 queue_index = tfile->queue_index; if (!rxhash) return; else head = &tun->flows[tun_hashfn(rxhash)]; rcu_read_lock(); /* We may get a very small possibility of OOO during switching, not * worth to optimize.*/ if (tun->numqueues == 1 || tfile->detached) goto unlock; e = tun_flow_find(head, rxhash); if (likely(e)) { /* TODO: keep queueing to old queue until it's empty? */ e->queue_index = queue_index; e->updated = jiffies; sock_rps_record_flow_hash(e->rps_rxhash); } else { spin_lock_bh(&tun->lock); if (!tun_flow_find(head, rxhash) && tun->flow_count < MAX_TAP_FLOWS) tun_flow_create(tun, head, rxhash, queue_index); if (!timer_pending(&tun->flow_gc_timer)) mod_timer(&tun->flow_gc_timer, round_jiffies_up(jiffies + delay)); spin_unlock_bh(&tun->lock); } unlock: rcu_read_unlock(); }

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/** * Save the hash received in the stack receive path and update the * flow_hash table accordingly. */
static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) { if (unlikely(e->rps_rxhash != hash)) e->rps_rxhash = hash; }

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/* We try to identify a flow through its rxhash first. The reason that * we do not check rxq no. is because some cards(e.g 82599), chooses * the rxq based on the txq where the last packet of the flow comes. As * the userspace application move between processors, we may get a * different rxq no. here. If we could not get rxhash, then we would * hope the rxq no. may help here. */
static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, void *accel_priv, select_queue_fallback_t fallback) { struct tun_struct *tun = netdev_priv(dev); struct tun_flow_entry *e; u32 txq = 0; u32 numqueues = 0; rcu_read_lock(); numqueues = ACCESS_ONCE(tun->numqueues); txq = skb_get_hash(skb); if (txq) { e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); if (e) { tun_flow_save_rps_rxhash(e, txq); txq = e->queue_index; } else /* use multiply and shift instead of expensive divide */ txq = ((u64)txq * numqueues) >> 32; } else if (likely(skb_rx_queue_recorded(skb))) { txq = skb_get_rx_queue(skb); while (unlikely(txq >= numqueues)) txq -= numqueues; } rcu_read_unlock(); return txq; }

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static inline bool tun_not_capable(struct tun_struct *tun) { const struct cred *cred = current_cred(); struct net *net = dev_net(tun->dev); return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || (gid_valid(tun->group) && !in_egroup_p(tun->group))) && !ns_capable(net->user_ns, CAP_NET_ADMIN); }

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static void tun_set_real_num_queues(struct tun_struct *tun) { netif_set_real_num_tx_queues(tun->dev, tun->numqueues); netif_set_real_num_rx_queues(tun->dev, tun->numqueues); }

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static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) { tfile->detached = tun; list_add_tail(&tfile->next, &tun->disabled); ++tun->numdisabled; }

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static struct tun_struct *tun_enable_queue(struct tun_file *tfile) { struct tun_struct *tun = tfile->detached; tfile->detached = NULL; list_del_init(&tfile->next); --tun->numdisabled; return tun; }

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static void tun_queue_purge(struct tun_file *tfile) { struct sk_buff *skb; while ((skb = skb_array_consume(&tfile->tx_array)) != NULL) kfree_skb(skb); skb_queue_purge(&tfile->sk.sk_error_queue); }

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static void __tun_detach(struct tun_file *tfile, bool clean) { struct tun_file *ntfile; struct tun_struct *tun; tun = rtnl_dereference(tfile->tun); if (tun && !tfile->detached) { u16 index = tfile->queue_index; BUG_ON(index >= tun->numqueues); rcu_assign_pointer(tun->tfiles[index], tun->tfiles[tun->numqueues - 1]); ntfile = rtnl_dereference(tun->tfiles[index]); ntfile->queue_index = index; --tun->numqueues; if (clean) { RCU_INIT_POINTER(tfile->tun, NULL); sock_put(&tfile->sk); } else tun_disable_queue(tun, tfile); synchronize_net(); tun_flow_delete_by_queue(tun, tun->numqueues + 1); /* Drop read queue */ tun_queue_purge(tfile); tun_set_real_num_queues(tun); } else if (tfile->detached && clean) { tun = tun_enable_queue(tfile); sock_put(&tfile->sk); } if (clean) { if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { netif_carrier_off(tun->dev); if (!(tun->flags & IFF_PERSIST) && tun->dev->reg_state == NETREG_REGISTERED) unregister_netdevice(tun->dev); } if (tun) skb_array_cleanup(&tfile->tx_array); sock_put(&tfile->sk); } }

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static void tun_detach(struct tun_file *tfile, bool clean) { rtnl_lock(); __tun_detach(tfile, clean); rtnl_unlock(); }

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static void tun_detach_all(struct net_device *dev) { struct tun_struct *tun = netdev_priv(dev); struct tun_file *tfile, *tmp; int i, n = tun->numqueues; for (i = 0; i < n; i++) { tfile = rtnl_dereference(tun->tfiles[i]); BUG_ON(!tfile); tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; tfile->socket.sk->sk_data_ready(tfile->socket.sk); RCU_INIT_POINTER(tfile->tun, NULL); --tun->numqueues; } list_for_each_entry(tfile, &tun->disabled, next) { tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; tfile->socket.sk->sk_data_ready(tfile->socket.sk); RCU_INIT_POINTER(tfile->tun, NULL); } BUG_ON(tun->numqueues != 0); synchronize_net(); for (i = 0; i < n; i++) { tfile = rtnl_dereference(tun->tfiles[i]); /* Drop read queue */ tun_queue_purge(tfile); sock_put(&tfile->sk); } list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { tun_enable_queue(tfile); tun_queue_purge(tfile); sock_put(&tfile->sk); } BUG_ON(tun->numdisabled != 0); if (tun->flags & IFF_PERSIST) module_put(THIS_MODULE); }

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static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) { struct tun_file *tfile = file->private_data; struct net_device *dev = tun->dev; int err; err = security_tun_dev_attach(tfile->socket.sk, tun->security); if (err < 0) goto out; err = -EINVAL; if (rtnl_dereference(tfile->tun) && !tfile->detached) goto out; err = -EBUSY; if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) goto out; err = -E2BIG; if (!tfile->detached && tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) goto out; err = 0; /* Re-attach the filter to persist device */ if (!skip_filter && (tun->filter_attached == true)) { lock_sock(tfile->socket.sk); err = sk_attach_filter(&tun->fprog, tfile->socket.sk); release_sock(tfile->socket.sk); if (!err) goto out; } if (!tfile->detached && skb_array_init(&tfile->tx_array, dev->tx_queue_len, GFP_KERNEL)) { err = -ENOMEM; goto out; } tfile->queue_index = tun->numqueues; tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN; rcu_assign_pointer(tfile->tun, tun); rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); tun->numqueues++; if (tfile->detached) tun_enable_queue(tfile); else sock_hold(&tfile->sk); tun_set_real_num_queues(tun); /* device is allowed to go away first, so no need to hold extra * refcnt. */ out: return err; }

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stephen hemmingerstephen hemminger10.33%15.00%
Total307100.00%20100.00%


static struct tun_struct *__tun_get(struct tun_file *tfile) { struct tun_struct *tun; rcu_read_lock(); tun = rcu_dereference(tfile->tun); if (tun) dev_hold(tun->dev); rcu_read_unlock(); return tun; }

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PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman2961.70%266.67%
jason wangjason wang1838.30%133.33%
Total47100.00%3100.00%


static struct tun_struct *tun_get(struct file *file) { return __tun_get(file->private_data); }

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PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman21100.00%1100.00%
Total21100.00%1100.00%


static void tun_put(struct tun_struct *tun) { dev_put(tun->dev); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman1583.33%266.67%
jason wangjason wang316.67%133.33%
Total18100.00%3100.00%

/* TAP filtering */
static void addr_hash_set(u32 *mask, const u8 *addr) { int n = ether_crc(ETH_ALEN, addr) >> 26; mask[n >> 5] |= (1 << (n & 31)); }

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PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy3579.55%150.00%
pre-gitpre-git920.45%150.00%
Total44100.00%2100.00%


static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) { int n = ether_crc(ETH_ALEN, addr) >> 26; return mask[n >> 5] & (1 << (n & 31)); }

Contributors

PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy3676.60%150.00%
pre-gitpre-git1123.40%150.00%
Total47100.00%2100.00%


static int update_filter(struct tap_filter *filter, void __user *arg) { struct { u8 u[ETH_ALEN]; } *addr; struct tun_filter uf; int err, alen, n, nexact; if (copy_from_user(&uf, arg, sizeof(uf))) return -EFAULT; if (!uf.count) { /* Disabled */ filter->count = 0; return 0; } alen = ETH_ALEN * uf.count; addr = memdup_user(arg + sizeof(uf), alen); if (IS_ERR(addr)) return PTR_ERR(addr); /* The filter is updated without holding any locks. Which is * perfectly safe. We disable it first and in the worst * case we'll accept a few undesired packets. */ filter->count = 0; wmb(); /* Use first set of addresses as an exact filter */ for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) memcpy(filter->addr[n], addr[n].u, ETH_ALEN); nexact = n; /* Remaining multicast addresses are hashed, * unicast will leave the filter disabled. */ memset(filter->mask, 0, sizeof(filter->mask)); for (; n < uf.count; n++) { if (!is_multicast_ether_addr(addr[n].u)) { err = 0; /* no filter */ goto free_addr; } addr_hash_set(filter->mask, addr[n].u); } /* For ALLMULTI just set the mask to all ones. * This overrides the mask populated above. */ if ((uf.flags & TUN_FLT_ALLMULTI)) memset(filter->mask, ~0, sizeof(filter->mask)); /* Now enable the filter */ wmb(); filter->count = nexact; /* Return the number of exact filters */ err = nexact; free_addr: kfree(addr); return err; }

Contributors

PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy23782.29%233.33%
alex williamsonalex williamson258.68%116.67%
sf markus elfringsf markus elfring155.21%233.33%
pre-gitpre-git113.82%116.67%
Total288100.00%6100.00%

/* Returns: 0 - drop, !=0 - accept */
static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) { /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect * at this point. */ struct ethhdr *eh = (struct ethhdr *) skb->data; int i; /* Exact match */ for (i = 0; i < filter->count; i++) if (ether_addr_equal(eh->h_dest, filter->addr[i])) return 1; /* Inexact match (multicast only) */ if (is_multicast_ether_addr(eh->h_dest)) return addr_hash_test(filter->mask, eh->h_dest); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy9498.95%150.00%
joe perchesjoe perches11.05%150.00%
Total95100.00%2100.00%

/* * Checks whether the packet is accepted or not. * Returns: 0 - drop, !=0 - accept */
static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) { if (!filter->count) return 1; return run_filter(filter, skb); }

Contributors

PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy35100.00%1100.00%
Total35100.00%1100.00%

/* Network device part of the driver */ static const struct ethtool_ops tun_ethtool_ops; /* Net device detach from fd. */
static void tun_net_uninit(struct net_device *dev) { tun_detach_all(dev); }

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PersonTokensPropCommitsCommitProp
jason wangjason wang1168.75%150.00%
eric w. biedermaneric w. biederman531.25%150.00%
Total16100.00%2100.00%

/* Net device open. */
static int tun_net_open(struct net_device *dev) { netif_tx_start_all_queues(dev); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy1894.74%150.00%
jason wangjason wang15.26%150.00%
Total19100.00%2100.00%

/* Net device close. */
static int tun_net_close(struct net_device *dev) { netif_tx_stop_all_queues(dev); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy1894.74%150.00%
jason wangjason wang15.26%150.00%
Total19100.00%2100.00%

/* Net device start xmit */
static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) { struct tun_struct *tun = netdev_priv(dev); int txq = skb->queue_mapping; struct tun_file *tfile; u32 numqueues = 0; rcu_read_lock(); tfile = rcu_dereference(tun->tfiles[txq]); numqueues = ACCESS_ONCE(tun->numqueues); /* Drop packet if interface is not attached */ if (txq >= numqueues) goto drop; #ifdef CONFIG_RPS if (numqueues == 1 && static_key_false(&rps_needed)) { /* Select queue was not called for the skbuff, so we extract the * RPS hash and save it into the flow_table here. */ __u32 rxhash; rxhash = skb_get_hash(skb); if (rxhash) { struct tun_flow_entry *e; e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], rxhash); if (e) tun_flow_save_rps_rxhash(e, rxhash); } } #endif tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); BUG_ON(!tfile); /* 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)) goto drop; if (tfile->socket.sk->sk_filter && sk_filter(tfile->socket.sk, skb)) goto drop; if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) goto drop; skb_tx_timestamp(skb); /* Orphan the skb - required as we might hang on to it * for indefinite time. */ skb_orphan(skb); nf_reset(skb); if (skb_array_produce(&tfile->tx_array, skb)) goto drop; /* Notify and wake up reader process */ if (tfile->flags & TUN_FASYNC) kill_fasync(&tfile->fasync, SIGIO, POLL_IN); tfile->socket.sk->sk_data_ready(tfile->socket.sk); rcu_read_unlock(); return NETDEV_TX_OK; drop: this_cpu_inc(tun->pcpu_stats->tx_dropped); skb_tx_error(skb); kfree_skb(skb); rcu_read_unlock(); return NET_XMIT_DROP; }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang8927.64%728.00%
tom herberttom herbert5918.32%14.00%
maksim krasnyanskiymaksim krasnyanskiy5316.46%14.00%
michael s. tsirkinmichael s. tsirkin309.32%312.00%
pre-gitpre-git278.39%14.00%
linus torvaldslinus torvalds175.28%14.00%
dominic currandominic curran144.35%14.00%
xi wangxi wang92.80%14.00%
eric dumazeteric dumazet72.17%28.00%
paolo abenipaolo abeni61.86%14.00%
richard cochranrichard cochran41.24%14.00%
joe perchesjoe perches30.93%14.00%
stephen hemmingerstephen hemminger10.31%14.00%
herbert xuherbert xu10.31%14.00%
soheil hassas yeganehsoheil hassas yeganeh10.31%14.00%
patrick mchardypatrick mchardy10.31%14.00%
Total322100.00%25100.00%


static void tun_net_mclist(struct net_device *dev) { /* * This callback is supposed to deal with mc filter in * _rx_ path and has nothing to do with the _tx_ path. * In rx path we always accept everything userspace gives us. */ }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git1191.67%150.00%
maksim krasnyanskiymaksim krasnyanskiy18.33%150.00%
Total12100.00%2100.00%


static netdev_features_t tun_net_fix_features(struct net_device *dev, netdev_features_t features) { struct tun_struct *tun = netdev_priv(dev); return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); }

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PersonTokensPropCommitsCommitProp
michal miroslawmichal miroslaw40100.00%2100.00%
Total40100.00%2100.00%

#ifdef CONFIG_NET_POLL_CONTROLLER
static void tun_poll_controller(struct net_device *dev) { /* * Tun only receives frames when: * 1) the char device endpoint gets data from user space * 2) the tun socket gets a sendmsg call from user space * Since both of those are synchronous operations, we are guaranteed * never to have pending data when we poll for it * so there is nothing to do here but return. * We need this though so netpoll recognizes us as an interface that * supports polling, which enables bridge devices in virt setups to * still use netconsole */ return; }

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PersonTokensPropCommitsCommitProp
neil hormanneil horman1292.31%150.00%
stephen hemmingerstephen hemminger17.69%150.00%
Total13100.00%2100.00%

#endif
static void tun_set_headroom(struct net_device *dev, int new_hr) { struct tun_struct *tun = netdev_priv(dev); if (new_hr < NET_SKB_PAD) new_hr = NET_SKB_PAD; tun->align = new_hr; }

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PersonTokensPropCommitsCommitProp
paolo abenipaolo abeni40100.00%1100.00%
Total40100.00%1100.00%


static struct rtnl_link_stats64 * tun_net_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) { u32 rx_dropped = 0, tx_dropped = 0, rx_frame_errors = 0; struct tun_struct *tun = netdev_priv(dev); struct tun_pcpu_stats *p; int i; for_each_possible_cpu(i) { u64 rxpackets, rxbytes, txpackets, txbytes; unsigned int start; p = per_cpu_ptr(tun->pcpu_stats, i); do { start = u64_stats_fetch_begin(&p->syncp); rxpackets = p->rx_packets; rxbytes = p->rx_bytes; txpackets = p->tx_packets; txbytes = p->tx_bytes; } while (u64_stats_fetch_retry(&p->syncp, start)); stats->rx_packets += rxpackets; stats->rx_bytes += rxbytes; stats->tx_packets += txpackets; stats->tx_bytes += txbytes; /* u32 counters */ rx_dropped += p->rx_dropped; rx_frame_errors += p->rx_frame_errors; tx_dropped += p->tx_dropped; } stats->rx_dropped = rx_dropped; stats->rx_frame_errors = rx_frame_errors; stats->tx_dropped = tx_dropped; return stats; }

Contributors

PersonTokensPropCommitsCommitProp
paolo abenipaolo abeni193100.00%1100.00%
Total193100.00%1100.00%

static const struct net_device_ops tun_netdev_ops = { .ndo_uninit = tun_net_uninit, .ndo_open = tun_net_open, .ndo_stop = tun_net_close, .ndo_start_xmit = tun_net_xmit, .ndo_fix_features = tun_net_fix_features, .ndo_select_queue = tun_select_queue, #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_poll_controller = tun_poll_controller, #endif .ndo_set_rx_headroom = tun_set_headroom, .ndo_get_stats64 = tun_net_get_stats64, }; static const struct net_device_ops tap_netdev_ops = { .ndo_uninit = tun_net_uninit, .ndo_open = tun_net_open, .ndo_stop = tun_net_close, .ndo_start_xmit = tun_net_xmit, .ndo_fix_features = tun_net_fix_features, .ndo_set_rx_mode = tun_net_mclist, .ndo_set_mac_address = eth_mac_addr, .ndo_validate_addr = eth_validate_addr, .ndo_select_queue = tun_select_queue, #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_poll_controller = tun_poll_controller, #endif .ndo_features_check = passthru_features_check, .ndo_set_rx_headroom = tun_set_headroom, .ndo_get_stats64 = tun_net_get_stats64, };
static void tun_flow_init(struct tun_struct *tun) { int i; for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) INIT_HLIST_HEAD(&tun->flows[i]); tun->ageing_time = TUN_FLOW_EXPIRE; setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); mod_timer(&tun->flow_gc_timer, round_jiffies_up(jiffies + tun->ageing_time)); }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang7698.70%150.00%
pavel emelianovpavel emelianov11.30%150.00%
Total77100.00%2100.00%


static void tun_flow_uninit(struct tun_struct *tun) { del_timer_sync(&tun->flow_gc_timer); tun_flow_flush(tun); }

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PersonTokensPropCommitsCommitProp
jason wangjason wang24100.00%1100.00%
Total24100.00%1100.00%

#define MIN_MTU 68 #define MAX_MTU 65535 /* Initialize net device. */
static void tun_net_init(struct net_device *dev) { struct tun_struct *tun = netdev_priv(dev); switch (tun->flags & TUN_TYPE_MASK) { case IFF_TUN: dev->netdev_ops = &tun_netdev_ops; /* Point-to-Point TUN Device */ dev->hard_header_len = 0; dev->addr_len = 0; dev->mtu = 1500; /* Zero header length */ dev->type = ARPHRD_NONE; dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; break; case IFF_TAP: dev->netdev_ops = &tap_netdev_ops; /* Ethernet TAP Device */ ether_setup(dev); dev->priv_flags &= ~IFF_TX_SKB_SHARING; dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; eth_hw_addr_random(dev); break; } dev->min_mtu = MIN_MTU; dev->max_mtu = MAX_MTU - dev->hard_header_len; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git7054.26%17.14%
stephen hemmingerstephen hemminger1914.73%214.29%
jarod wilsonjarod wilson1612.40%17.14%
neil hormanneil horman75.43%17.14%
ed swierked swierk43.10%17.14%
randy dunlaprandy dunlap32.33%17.14%
michael s. tsirkinmichael s. tsirkin21.55%17.14%
jamal hadi salimjamal hadi salim21.55%17.14%
al viroal viro21.55%17.14%
maksim krasnyanskiymaksim krasnyanskiy10.78%17.14%
kusanagi kouichikusanagi kouichi10.78%17.14%
brian braunsteinbrian braunstein10.78%17.14%
danny kukawkadanny kukawka10.78%17.14%
Total129100.00%14100.00%

/* Character device part */ /* Poll */
static unsigned int tun_chr_poll(struct file *file, poll_table *wait) { struct tun_file *tfile = file->private_data; struct tun_struct *tun = __tun_get(tfile); struct sock *sk; unsigned int mask = 0; if (!tun) return POLLERR; sk = tfile->socket.sk; tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); poll_wait(file, sk_sleep(sk), wait); if (!skb_array_empty(&tfile->tx_array)) mask |= POLLIN | POLLRDNORM; if (sock_writeable(sk) || (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) && sock_writeable(sk))) mask |= POLLOUT | POLLWRNORM; if (tun->dev->reg_state != NETREG_REGISTERED) mask = POLLERR; tun_put(tun); return mask; }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git4830.97%16.67%
herbert xuherbert xu3824.52%16.67%
eric w. biedermaneric w. biederman3321.29%426.67%
linus torvaldslinus torvalds1610.32%16.67%
mariusz kozlowskimariusz kozlowski53.23%16.67%
jason wangjason wang42.58%213.33%
xi wangxi wang42.58%16.67%
joe perchesjoe perches31.94%16.67%
michael s. tsirkinmichael s. tsirkin21.29%16.67%
david s. millerdavid s. miller10.65%16.67%
eric dumazeteric dumazet10.65%16.67%
Total155100.00%15100.00%

/* 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_file *tfile, size_t prepad, size_t len, size_t linear, int noblock) { struct sock *sk = tfile->socket.sk; struct sk_buff *skb; int err; /* 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 ERR_PTR(err); skb_reserve(skb, prepad); skb_put(skb, linear); skb->data_len = len - linear; skb->len += len - linear; return skb; }

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PersonTokensPropCommitsCommitProp
rusty russellrusty russell7761.11%116.67%
herbert xuherbert xu4233.33%233.33%
jason wangjason wang32.38%116.67%
michael s. tsirkinmichael s. tsirkin21.59%116.67%
eric dumazeteric dumazet21.59%116.67%
Total126100.00%6100.00%

/* Get packet from user space buffer */
static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, void *msg_control, struct iov_iter *from, int noblock) { struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; struct sk_buff *skb; size_t total_len = iov_iter_count(from); size_t len = total_len, align = tun->align, linear; struct virtio_net_hdr gso = { 0 }; struct tun_pcpu_stats *stats; int good_linear; int copylen; bool zerocopy = false; int err; u32 rxhash; if (!(tun->dev->flags & IFF_UP)) return -EIO; if (!(tun->flags & IFF_NO_PI)) { if (len < sizeof(pi)) return -EINVAL; len -= sizeof(pi); if (!copy_from_iter_full(&pi, sizeof(pi), from)) return -EFAULT; } if (tun->flags & IFF_VNET_HDR) { int vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); if (len < vnet_hdr_sz) return -EINVAL; len -= vnet_hdr_sz; if (!copy_from_iter_full(&gso, sizeof(gso), from)) return -EFAULT; if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); if (tun16_to_cpu(tun, gso.hdr_len) > len) return -EINVAL; iov_iter_advance(from, vnet_hdr_sz - sizeof(gso)); } if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { align += NET_IP_ALIGN; if (unlikely(len < ETH_HLEN || (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) return -EINVAL; } good_linear = SKB_MAX_HEAD(align); if (msg_control) { struct iov_iter i = *from; /* There are 256 bytes to be copied in skb, so there is * enough room for skb expand head in case it is used. * The rest of the buffer is mapped from userspace. */ copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; if (copylen > good_linear) copylen = good_linear; linear = copylen; iov_iter_advance(&i, copylen); if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) zerocopy = true; } if (!zerocopy) { copylen = len; if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) linear = good_linear; else linear = tun16_to_cpu(tun, gso.hdr_len); } skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); if (IS_ERR(skb)) { if (PTR_ERR(skb) != -EAGAIN) this_cpu_inc(tun->pcpu_stats->rx_dropped); return PTR_ERR(skb); } if (zerocopy) err = zerocopy_sg_from_iter(skb, from); else err = skb_copy_datagram_from_iter(skb, 0, from, len); if (err) { this_cpu_inc(tun->pcpu_stats->rx_dropped); kfree_skb(skb); return -EFAULT; } if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) { this_cpu_inc(tun->pcpu_stats->rx_frame_errors); kfree_skb(skb); return -EINVAL; } switch (tun->flags & TUN_TYPE_MASK) { case IFF_TUN: if (tun->flags & IFF_NO_PI) { switch (skb->data[0] & 0xf0) { case 0x40: pi.proto = htons(ETH_P_IP); break; case 0x60: pi.proto = htons(ETH_P_IPV6); break; default: this_cpu_inc(tun->pcpu_stats->rx_dropped); kfree_skb(skb); return -EINVAL; } } skb_reset_mac_header(skb); skb->protocol = pi.proto; skb->dev = tun->dev; break; case IFF_TAP: skb->protocol = eth_type_trans(skb, tun->dev); break; } /* copy skb_ubuf_info for callback when skb has no error */ if (zerocopy) { skb_shinfo(skb)->destructor_arg = msg_control; skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; } else if (msg_control) { struct ubuf_info *uarg = msg_control; uarg->callback(uarg, false); } skb_reset_network_header(skb); skb_probe_transport_header(skb, 0); rxhash = skb_get_hash(skb); #ifndef CONFIG_4KSTACKS local_bh_disable(); netif_receive_skb(skb); local_bh_enable(); #else netif_rx_ni(skb); #endif stats = get_cpu_ptr(tun->pcpu_stats); u64_stats_update_begin(&stats->syncp); stats->rx_packets++; stats->rx_bytes += len; u64_stats_update_end(&stats->syncp); put_cpu_ptr(stats); tun_flow_update(tun, rxhash, tfile); return total_len; }

Contributors

PersonTokensPropCommitsCommitProp
michael s. tsirkinmichael s. tsirkin14316.09%510.20%
pre-gitpre-git13915.64%24.08%
jason wangjason wang11312.71%816.33%
paolo abenipaolo abeni829.22%36.12%
herbert xuherbert xu819.11%48.16%
rusty russellrusty russell677.54%36.12%
ang way chuangang way chuang637.09%12.04%
al viroal viro525.85%24.08%
eric dumazeteric dumazet273.04%24.08%
sven henkelsven henkel202.25%12.04%
andrey konovalovandrey konovalov182.02%12.04%
dan carpenterdan carpenter131.46%12.04%
stephen hemmingerstephen hemminger111.24%24.08%
dave jonesdave jones111.24%12.04%
arnaldo carvalho de meloarnaldo carvalho de melo111.24%24.08%
willem de bruijnwillem de bruijn101.12%12.04%
pravin b shelarpravin b shelar91.01%12.04%
vlad yasevichvlad yasevich50.56%12.04%
maksim krasnyanskiymaksim krasnyanskiy30.34%12.04%
david s. millerdavid s. miller30.34%12.04%
jeff garzikjeff garzik20.22%12.04%
jarno rajahalmejarno rajahalme20.22%12.04%
andrew mortonandrew morton10.11%12.04%
harvey harrisonharvey harrison10.11%12.04%
tom herberttom herbert10.11%12.04%
linus torvaldslinus torvalds10.11%12.04%
Total889100.00%49100.00%


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; ssize_t result; if (!tun) return -EBADFD; result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); tun_put(tun); return result; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git2024.10%110.00%
herbert xuherbert xu1720.48%220.00%
eric w. biedermaneric w. biederman1315.66%110.00%
jason wangjason wang1113.25%110.00%
linus torvaldslinus torvalds910.84%110.00%
badari pulavartybadari pulavarty56.02%110.00%
al viroal viro44.82%110.00%
michael s. tsirkinmichael s. tsirkin33.61%110.00%
maksim krasnyanskiymaksim krasnyanskiy11.20%110.00%
Total83100.00%10100.00%

/* Put packet to the user space buffer */
static ssize_t tun_put_user(struct tun_struct *tun, struct tun_file *tfile, struct sk_buff *skb, struct iov_iter *iter) { struct tun_pi pi = { 0, skb->protocol }; struct tun_pcpu_stats *stats; ssize_t total; int vlan_offset = 0; int vlan_hlen = 0; int vnet_hdr_sz = 0; if (skb_vlan_tag_present(skb)) vlan_hlen = VLAN_HLEN; if (tun->flags & IFF_VNET_HDR) vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz); total = skb->len + vlan_hlen + vnet_hdr_sz; if (!(tun->flags & IFF_NO_PI)) { if (iov_iter_count(iter) < sizeof(pi)) return -EINVAL; total += sizeof(pi); if (iov_iter_count(iter) < total) { /* Packet will be striped */ pi.flags |= TUN_PKT_STRIP; } if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) return -EFAULT; } if (vnet_hdr_sz) { struct virtio_net_hdr gso; if (iov_iter_count(iter) < vnet_hdr_sz) return -EINVAL; if (virtio_net_hdr_from_skb(skb, &gso, tun_is_little_endian(tun), true)) { struct skb_shared_info *sinfo = skb_shinfo(skb); pr_err("unexpected GSO type: " "0x%x, gso_size %d, hdr_len %d\n", sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), tun16_to_cpu(tun, gso.hdr_len)); print_hex_dump(KERN_ERR, "tun: ", DUMP_PREFIX_NONE, 16, 1, skb->head, min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); WARN_ON_ONCE(1); return -EINVAL; } if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) return -EFAULT; iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); } if (vlan_hlen) { int ret; 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); 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; } skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); done: /* caller is in process context, */ stats = get_cpu_ptr(tun->pcpu_stats); u64_stats_update_begin(&stats->syncp); stats->tx_packets++; stats->tx_bytes += skb->len + vlan_hlen; u64_stats_update_end(&stats->syncp); put_cpu_ptr(tun->pcpu_stats); return total; }

Contributors

PersonTokensPropCommitsCommitProp
herbert xuherbert xu11522.33%312.50%
jason wangjason wang11021.36%416.67%
pre-gitpre-git9718.83%28.33%
michael s. tsirkinmichael s. tsirkin7514.56%520.83%
rusty russellrusty russell499.51%14.17%
paolo abenipaolo abeni377.18%14.17%
mike rapoportmike rapoport101.94%14.17%
stephen hemmingerstephen hemminger71.36%14.17%
maksim krasnyanskiymaksim krasnyanskiy50.97%14.17%
willem de bruijnwillem de bruijn30.58%14.17%
jarno rajahalmejarno rajahalme20.39%14.17%
jiri pirkojiri pirko20.39%14.17%
joe perchesjoe perches20.39%14.17%
jeff garzikjeff garzik10.19%14.17%
Total515100.00%24100.00%


static struct sk_buff *tun_ring_recv(struct tun_file *tfile, int noblock, int *err) { DECLARE_WAITQUEUE(wait, current); struct sk_buff *skb = NULL; int error = 0; skb = skb_array_consume(&tfile->tx_array); if (skb) goto out; if (noblock) { error = -EAGAIN; goto out; } add_wait_queue(&tfile->wq.wait, &wait); current->state = TASK_INTERRUPTIBLE; while (1) { skb = skb_array_consume(&tfile->tx_array); if (skb) break; if (signal_pending(current)) { error = -ERESTARTSYS; break; } if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) { error = -EFAULT; break; } schedule(); } current->state = TASK_RUNNING; remove_wait_queue(&tfile->wq.wait, &wait); out: *err = error; return skb; }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang177100.00%2100.00%
Total177100.00%2100.00%


static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, struct iov_iter *to, int noblock) { struct sk_buff *skb; ssize_t ret; int err; tun_debug(KERN_INFO, tun, "tun_do_read\n"); if (!iov_iter_count(to)) return 0; /* Read frames from ring */ skb = tun_ring_recv(tfile, noblock, &err); if (!skb) return err; ret = tun_put_user(tun, tfile, skb, to); if (unlikely(ret < 0)) kfree_skb(skb); else consume_skb(skb); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git2724.11%16.25%
jason wangjason wang2219.64%318.75%
andrew mortonandrew morton1412.50%16.25%
michael s. tsirkinmichael s. tsirkin1311.61%16.25%
xi wangxi wang119.82%16.25%
al viroal viro87.14%16.25%
eric w. biedermaneric w. biederman54.46%16.25%
amos kongamos kong32.68%16.25%
herbert xuherbert xu32.68%16.25%
joe perchesjoe perches21.79%16.25%
maksim krasnyanskiymaksim krasnyanskiy21.79%212.50%
rami rosenrami rosen10.89%16.25%
alex gartrellalex gartrell10.89%16.25%
Total112100.00%16100.00%


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_struct *tun = __tun_get(tfile); ssize_t len = iov_iter_count(to), ret; if (!tun) return -EBADFD; ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK); ret = min_t(ssize_t, ret, len); if (ret > 0) iocb->ki_pos = ret; tun_put(tun); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
michael s. tsirkinmichael s. tsirkin6861.26%114.29%
zhi yong wuzhi yong wu1210.81%114.29%
david s. millerdavid s. miller119.91%114.29%
al viroal viro98.11%114.29%
eric w. biedermaneric w. biederman54.50%114.29%
andrew mortonandrew morton43.60%114.29%
jason wangjason wang21.80%114.29%
Total111100.00%7100.00%


static void tun_free_netdev(struct net_device *dev) { struct tun_struct *tun = netdev_priv(dev); BUG_ON(!(list_empty(&tun->disabled))); free_percpu(tun->pcpu_stats); tun_flow_uninit(tun); security_tun_dev_free_security(tun->security); free_netdev(dev); }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang4576.27%250.00%
paul moorepaul moore711.86%125.00%
paolo abenipaolo abeni711.86%125.00%
Total59100.00%4100.00%


static void tun_setup(struct net_device *dev) { struct tun_struct *tun = netdev_priv(dev); tun->owner = INVALID_UID; tun->group = INVALID_GID; dev->ethtool_ops = &tun_ethtool_ops; dev->destructor = tun_free_netdev; /* We prefer our own queue length */ dev->tx_queue_len = TUN_READQ_SIZE; }

Contributors

PersonTokensPropCommitsCommitProp
stephen hemmingerstephen hemminger2852.83%114.29%
jason wangjason wang815.09%228.57%
maksim krasnyanskiymaksim krasnyanskiy713.21%114.29%
guido guentherguido guenther59.43%114.29%
randy dunlaprandy dunlap35.66%114.29%
eric w. biedermaneric w. biederman23.77%114.29%
Total53100.00%7100.00%

/* Trivial set of netlink ops to allow deleting tun or tap * device with netlink. */
static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) { return -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman22100.00%1100.00%
Total22100.00%1100.00%

static struct rtnl_link_ops tun_link_ops __read_mostly = { .kind = DRV_NAME, .priv_size = sizeof(struct tun_struct), .setup = tun_setup, .validate = tun_validate, };
static void tun_sock_write_space(struct sock *sk) { struct tun_file *tfile; wait_queue_head_t *wqueue; if (!sock_writeable(sk)) return; if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) return; wqueue = sk_sleep(sk); if (wqueue && waitqueue_active(wqueue)) wake_up_interruptible_sync_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND); tfile = container_of(sk, struct tun_file, sk); kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); }

Contributors

PersonTokensPropCommitsCommitProp
herbert xuherbert xu6365.62%228.57%
eric dumazeteric dumazet1616.67%342.86%
jason wangjason wang1010.42%114.29%
michael s. tsirkinmichael s. tsirkin77.29%114.29%
Total96100.00%7100.00%


static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) { int ret; struct tun_file *tfile = container_of(sock, struct tun_file, socket); struct tun_struct *tun = __tun_get(tfile); if (!tun) return -EBADFD; ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, m->msg_flags & MSG_DONTWAIT); tun_put(tun); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
michael s. tsirkinmichael s. tsirkin5056.82%240.00%
jason wangjason wang3640.91%120.00%
al viroal viro22.27%240.00%
Total88100.00%5100.00%


static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, int flags) { struct tun_file *tfile = container_of(sock, struct tun_file, socket); struct tun_struct *tun = __tun_get(tfile); int ret; if (!tun) return -EBADFD; if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { ret = -EINVAL; goto out; } if (flags & MSG_ERRQUEUE) { ret = sock_recv_errqueue(sock->sk, m, total_len, SOL_PACKET, TUN_TX_TIMESTAMP); goto out; } ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT); if (ret > (ssize_t)total_len) { m->msg_flags |= MSG_TRUNC; ret = flags & MSG_TRUNC ? ret : total_len; } out: tun_put(tun); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
michael s. tsirkinmichael s. tsirkin6740.61%112.50%
richard cochranrichard cochran3018.18%112.50%
jason wangjason wang2917.58%112.50%
david s. millerdavid s. miller2414.55%112.50%
gao fenggao feng106.06%112.50%
alex gartrellalex gartrell31.82%112.50%
al viroal viro21.21%225.00%
Total165100.00%8100.00%


static int tun_peek_len(struct socket *sock) { struct tun_file *tfile = container_of(sock, struct tun_file, socket); struct tun_struct *tun; int ret = 0; tun = __tun_get(tfile); if (!tun) return 0; ret = skb_array_peek_len(&tfile->tx_array); tun_put(tun); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang69100.00%1100.00%
Total69100.00%1100.00%

/* Ops structure to mimic raw sockets with tun */ static const struct proto_ops tun_socket_ops = { .peek_len = tun_peek_len, .sendmsg = tun_sendmsg, .recvmsg = tun_recvmsg, }; static struct proto tun_proto = { .name = "tun", .owner = THIS_MODULE, .obj_size = sizeof(struct tun_file), };
static int tun_flags(struct tun_struct *tun) { return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); }

Contributors

PersonTokensPropCommitsCommitProp
david woodhousedavid woodhouse1869.23%150.00%
michael s. tsirkinmichael s. tsirkin830.77%150.00%
Total26100.00%2100.00%


static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, char *buf) { struct tun_struct *tun = netdev_priv(to_net_dev(dev)); return sprintf(buf, "0x%x\n", tun_flags(tun)); }

Contributors

PersonTokensPropCommitsCommitProp
david woodhousedavid woodhouse46100.00%1100.00%
Total46100.00%1100.00%


static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, char *buf) { struct tun_struct *tun = netdev_priv(to_net_dev(dev)); return uid_valid(tun->owner)? sprintf(buf, "%u\n", from_kuid_munged(current_user_ns(), tun->owner)): sprintf(buf, "-1\n"); }

Contributors

PersonTokensPropCommitsCommitProp
david woodhousedavid woodhouse4467.69%150.00%
eric w. biedermaneric w. biederman2132.31%150.00%
Total65100.00%2100.00%


static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, char *buf) { struct tun_struct *tun = netdev_priv(to_net_dev(dev)); return gid_valid(tun->group) ? sprintf(buf, "%u\n", from_kgid_munged(current_user_ns(), tun->group)): sprintf(buf, "-1\n"); }

Contributors

PersonTokensPropCommitsCommitProp
david woodhousedavid woodhouse4467.69%150.00%
eric w. biedermaneric w. biederman2132.31%150.00%
Total65100.00%2100.00%

static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); static DEVICE_ATTR(group, 0444, tun_show_group, NULL); static struct attribute *tun_dev_attrs[] = { &dev_attr_tun_flags.attr, &dev_attr_owner.attr, &dev_attr_group.attr, NULL }; static const struct attribute_group tun_attr_group = { .attrs = tun_dev_attrs };
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 net_device *dev; int err; if (tfile->detached) return -EINVAL; dev = __dev_get_by_name(net, ifr->ifr_name); if (dev) { if (ifr->ifr_flags & IFF_TUN_EXCL) return -EBUSY; if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) tun = netdev_priv(dev); else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) tun = netdev_priv(dev); else return -EINVAL; if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != !!(tun->flags & IFF_MULTI_QUEUE)) return -EINVAL; if (tun_not_capable(tun)) return -EPERM; err = security_tun_dev_open(tun->security); if (err < 0) return err; err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); if (err < 0) return err; if (tun->flags & IFF_MULTI_QUEUE && (tun->numqueues + tun->numdisabled > 1)) { /* One or more queue has already been attached, no need * to initialize the device again. */ return 0; } } else { char *name; unsigned long flags = 0; int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? MAX_TAP_QUEUES : 1; if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) return -EPERM; err = security_tun_dev_create(); if (err < 0) return err; /* Set dev type */ if (ifr->ifr_flags & IFF_TUN) { /* TUN device */ flags |= IFF_TUN; name = "tun%d"; } else if (ifr->ifr_flags & IFF_TAP) { /* TAP device */ flags |= IFF_TAP; name = "tap%d"; } else return -EINVAL; if (*ifr->ifr_name) name = ifr->ifr_name; dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, NET_NAME_UNKNOWN, tun_setup, queues, queues); if (!dev) return -ENOMEM; dev_net_set(dev, net); dev->rtnl_link_ops = &tun_link_ops; dev->ifindex = tfile->ifindex; dev->sysfs_groups[0] = &tun_attr_group; tun = netdev_priv(dev); tun->dev = dev; tun->flags = flags; tun->txflt.count = 0; tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); tun->align = NET_SKB_PAD; tun->filter_attached = false; tun->sndbuf = tfile->socket.sk->sk_sndbuf; tun->pcpu_stats = netdev_alloc_pcpu_stats(struct tun_pcpu_stats); if (!tun->pcpu_stats) { err = -ENOMEM; goto err_free_dev; } spin_lock_init(&tun->lock); err = security_tun_dev_alloc_security(&tun->security); if (err < 0) goto err_free_stat; tun_net_init(dev); tun_flow_init(tun); dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; dev->features = dev->hw_features | NETIF_F_LLTX; dev->vlan_features = dev->features & ~(NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX); INIT_LIST_HEAD(&tun->disabled); err = tun_attach(tun, file, false); if (err < 0) goto err_free_flow; err = register_netdevice(tun->dev); if (err < 0) goto err_detach; } netif_carrier_on(tun->dev); tun_debug(KERN_INFO, tun, "tun_set_iff\n"); tun->flags = (tun->flags & ~TUN_FEATURES) | (ifr->ifr_flags & TUN_FEATURES); /* Make sure persistent devices do not get stuck in * xoff state. */ if (netif_running(tun->dev)) netif_tx_wake_all_queues(tun->dev); strcpy(ifr->ifr_name, tun->dev->name); return 0; err_detach: tun_detach_all(dev); err_free_flow: tun_flow_uninit(tun); security_tun_dev_free_security(tun->security); err_free_stat: free_percpu(tun->pcpu_stats); err_free_dev: free_netdev(dev); return err; }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang21429.04%1325.00%
eric w. biedermaneric w. biederman8511.53%59.62%
pre-gitpre-git7710.45%11.92%
paul moorepaul moore557.46%35.77%
linus torvaldslinus torvalds476.38%11.92%
paolo abenipaolo abeni456.11%35.77%
stephen hemmingerstephen hemminger456.11%35.77%
pavel emelianovpavel emelianov344.61%47.69%
michael s. tsirkinmichael s. tsirkin233.12%47.69%
david woodhousedavid woodhouse233.12%23.85%
maksim krasnyanskiymaksim krasnyanskiy192.58%23.85%
herbert xuherbert xu141.90%11.92%
francois romieufrancois romieu121.63%11.92%
takashi iwaitakashi iwai101.36%11.92%
fernando luis vazquez caofernando luis vazquez cao70.95%11.92%
mikulas patockamikulas patocka60.81%11.92%
andrew mortonandrew morton50.68%11.92%
nathaniel filardonathaniel filardo40.54%11.92%
kusanagi kouichikusanagi kouichi40.54%11.92%
joe perchesjoe perches30.41%11.92%
randy dunlaprandy dunlap30.41%11.92%
tom gundersentom gundersen20.27%11.92%
Total737100.00%52100.00%


static void tun_get_iff(struct net *net, struct tun_struct *tun, struct ifreq *ifr) { tun_debug(KERN_INFO, tun, "tun_get_iff\n"); strcpy(ifr->ifr_name, tun->dev->name); ifr->ifr_flags = tun_flags(tun); }

Contributors

PersonTokensPropCommitsCommitProp
mark mcloughlinmark mcloughlin4382.69%120.00%
david woodhousedavid woodhouse35.77%120.00%
joe perchesjoe perches35.77%120.00%
herbert xuherbert xu23.85%120.00%
rami rosenrami rosen11.92%120.00%
Total52100.00%5100.00%

/* This is like a cut-down ethtool ops, except done via tun fd so no * privs required. */
static int set_offload(struct tun_struct *tun, unsigned long arg) { netdev_features_t features = 0; if (arg & TUN_F_CSUM) { features |= NETIF_F_HW_CSUM; arg &= ~TUN_F_CSUM; if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { if (arg & TUN_F_TSO_ECN) { features |= NETIF_F_TSO_ECN; arg &= ~TUN_F_TSO_ECN; } if (arg & TUN_F_TSO4) features |= NETIF_F_TSO; if (arg & TUN_F_TSO6) features |= NETIF_F_TSO6; arg &= ~(TUN_F_TSO4|TUN_F_TSO6); } if (arg & TUN_F_UFO) { features |= NETIF_F_UFO; arg &= ~TUN_F_UFO; } } /* This gives the user a way to test for new features in future by * trying to set them. */ if (arg) return -EINVAL; tun->set_features = features; netdev_update_features(tun->dev); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
rusty russellrusty russell8864.23%120.00%
jason wangjason wang2719.71%120.00%
vlad yasevichvlad yasevich1712.41%120.00%
michal miroslawmichal miroslaw53.65%240.00%
Total137100.00%5100.00%


static void tun_detach_filter(struct tun_struct *tun, int n) { int i; struct tun_file *tfile; for (i = 0; i < n; i++) { tfile = rtnl_dereference(tun->tfiles[i]); lock_sock(tfile->socket.sk); sk_detach_filter(tfile->socket.sk); release_sock(tfile->socket.sk); } tun->filter_attached = false; }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang6376.83%266.67%
hannes frederic sowahannes frederic sowa1923.17%133.33%
Total82100.00%3100.00%


static int tun_attach_filter(struct tun_struct *tun) { int i, ret = 0; struct tun_file *tfile; for (i = 0; i < tun->numqueues; i++) { tfile = rtnl_dereference(tun->tfiles[i]); lock_sock(tfile->socket.sk); ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); release_sock(tfile->socket.sk); if (ret) { tun_detach_filter(tun, i); return ret; } } tun->filter_attached = true; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang8374.77%240.00%
hannes frederic sowahannes frederic sowa1917.12%120.00%
rusty russellrusty russell87.21%120.00%
michal miroslawmichal miroslaw10.90%120.00%
Total111100.00%5100.00%


static void tun_set_sndbuf(struct tun_struct *tun) { struct tun_file *tfile; int i; for (i = 0; i < tun->numqueues; i++) { tfile = rtnl_dereference(tun->tfiles[i]); tfile->socket.sk->sk_sndbuf = tun->sndbuf; } }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang5490.00%250.00%
rusty russellrusty russell46.67%125.00%
michal miroslawmichal miroslaw23.33%125.00%
Total60100.00%4100.00%


static int tun_set_queue(struct file *file, struct ifreq *ifr) { struct tun_file *tfile = file->private_data; struct tun_struct *tun; int ret = 0; rtnl_lock(); if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { tun = tfile->detached; if (!tun) { ret = -EINVAL; goto unlock; } ret = security_tun_dev_attach_queue(tun->security); if (ret < 0) goto unlock; ret = tun_attach(tun, file, false); } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { tun = rtnl_dereference(tfile->tun); if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) ret = -EINVAL; else __tun_detach(tfile, false); } else ret = -EINVAL; unlock: rtnl_unlock(); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang13582.82%457.14%
paul moorepaul moore2515.34%114.29%
pavel emelianovpavel emelianov21.23%114.29%
michael s. tsirkinmichael s. tsirkin10.61%114.29%
Total163100.00%7100.00%


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_struct *tun; void __user* argp = (void __user*)arg; struct ifreq ifr; kuid_t owner; kgid_t group; int sndbuf; int vnet_hdr_sz; unsigned int ifindex; int le; int ret; if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == SOCK_IOC_TYPE) { if (copy_from_user(&ifr, argp, ifreq_len)) return -EFAULT; } else { memset(&ifr, 0, sizeof(ifr)); } if (cmd == TUNGETFEATURES) { /* Currently this just means: "what IFF flags are valid?". * This is needed because we never checked for invalid flags on * TUNSETIFF. */ return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, (unsigned int __user*)argp); } else if (cmd == TUNSETQUEUE) return tun_set_queue(file, &ifr); ret = 0; rtnl_lock(); tun = __tun_get(tfile); if (cmd == TUNSETIFF) { ret = -EEXIST; if (tun) goto unlock; ifr.ifr_name[IFNAMSIZ-1] = '\0'; ret = tun_set_iff(sock_net(&tfile->sk), file, &ifr); if (ret) goto unlock; if (copy_to_user(argp, &ifr, ifreq_len)) ret = -EFAULT; goto unlock; } if (cmd == TUNSETIFINDEX) { ret = -EPERM; if (tun) goto unlock; ret = -EFAULT; if (copy_from_user(&ifindex, argp, sizeof(ifindex))) goto unlock; ret = 0; tfile->ifindex = ifindex; goto unlock; } ret = -EBADFD; if (!tun) goto unlock; tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); ret = 0; switch (cmd) { case TUNGETIFF: tun_get_iff(current->nsproxy->net_ns, tun, &ifr); if (tfile->detached) ifr.ifr_flags |= IFF_DETACH_QUEUE; if (!tfile->socket.sk->sk_filter) ifr.ifr_flags |= IFF_NOFILTER; if (copy_to_user(argp, &ifr, ifreq_len)) ret = -EFAULT; break; case TUNSETNOCSUM: /* Disable/Enable checksum */ /* [unimplemented] */ tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", arg ? "disabled" : "enabled"); break; case TUNSETPERSIST: /* Disable/Enable persist mode. Keep an extra reference to the * module to prevent the module being unprobed. */ if (arg && !(tun->flags & IFF_PERSIST)) { tun->flags |= IFF_PERSIST; __module_get(THIS_MODULE); } if (!arg && (tun->flags & IFF_PERSIST)) { tun->flags &= ~IFF_PERSIST; module_put(THIS_MODULE); } tun_debug(KERN_INFO, tun, "persist %s\n", arg ? "enabled" : "disabled"); break; case TUNSETOWNER: /* Set owner of the device */ owner = make_kuid(current_user_ns(), arg); if (!uid_valid(owner)) { ret = -EINVAL; break; } tun->owner = owner; tun_debug(KERN_INFO, tun, "owner set to %u\n", from_kuid(&init_user_ns, tun->owner)); break; case TUNSETGROUP: /* Set group of the device */ group = make_kgid(current_user_ns(), arg); if (!gid_valid(group)) { ret = -EINVAL; break; } tun->group = group; tun_debug(KERN_INFO, tun, "group set to %u\n", from_kgid(&init_user_ns, tun->group)); break; case TUNSETLINK: /* Only allow setting the type when the interface is down */ if (tun->dev->flags & IFF_UP) { tun_debug(KERN_INFO, tun, "Linktype set failed because interface is up\n"); ret = -EBUSY; } else { tun->dev->type = (int) arg; tun_debug(KERN_INFO, tun, "linktype set to %d\n", tun->dev->type); ret = 0; } break; #ifdef TUN_DEBUG case TUNSETDEBUG: tun->debug = arg; break; #endif case TUNSETOFFLOAD: ret = set_offload(tun, arg); break; case TUNSETTXFILTER: /* Can be set only for TAPs */ ret = -EINVAL; if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) break; ret = update_filter(&tun->txflt, (void __user *)arg); break; case SIOCGIFHWADDR: /* Get hw address */ memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); ifr.ifr_hwaddr.sa_family = tun->dev->type; if (copy_to_user(argp, &ifr, ifreq_len)) ret = -EFAULT; break; case SIOCSIFHWADDR: /* Set hw address */ tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", ifr.ifr_hwaddr.sa_data); ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); break; case TUNGETSNDBUF: sndbuf = tfile->socket.sk->sk_sndbuf; if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) ret = -EFAULT; break; case TUNSETSNDBUF: if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { ret = -EFAULT; break; } tun->sndbuf = sndbuf; tun_set_sndbuf(tun); break; case TUNGETVNETHDRSZ: vnet_hdr_sz = tun->vnet_hdr_sz; if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) ret = -EFAULT; break; case TUNSETVNETHDRSZ: if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { ret = -EFAULT; break; } if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { ret = -EINVAL; break; } tun->vnet_hdr_sz = vnet_hdr_sz; break; case TUNGETVNETLE: le = !!(tun->flags & TUN_VNET_LE); if (put_user(le, (int __user *)argp)) ret = -EFAULT; break; case TUNSETVNETLE: if (get_user(le, (int __user *)argp)) { ret = -EFAULT; break; } if (le) tun->flags |= TUN_VNET_LE; else tun->flags &= ~TUN_VNET_LE; break; case TUNGETVNETBE: ret = tun_get_vnet_be(tun, argp); break; case TUNSETVNETBE: ret = tun_set_vnet_be(tun, argp); break; case TUNATTACHFILTER: /* Can be set only for TAPs */ ret = -EINVAL; if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) break; ret = -EFAULT; if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) break; ret = tun_attach_filter(tun); break; case TUNDETACHFILTER: /* Can be set only for TAPs */ ret = -EINVAL; if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) break; ret = 0; tun_detach_filter(tun, tun->numqueues); break; case TUNGETFILTER: ret = -EINVAL; if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) break; ret = -EFAULT; if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) break; ret = 0; break; default: ret = -EINVAL; break; } unlock: rtnl_unlock(); if (tun) tun_put(tun); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
michael s. tsirkinmichael s. tsirkin25420.13%613.04%
eric w. biedermaneric w. biederman15011.89%48.70%
pavel emelianovpavel emelianov14111.17%510.87%
herbert xuherbert xu987.77%24.35%
andrew mortonandrew morton977.69%12.17%
pre-gitpre-git897.05%12.17%
jason wangjason wang866.81%510.87%
linus torvaldslinus torvalds826.50%12.17%
mike kershawmike kershaw493.88%12.17%
maksim krasnyanskiymaksim krasnyanskiy332.61%12.17%
mark mcloughlinmark mcloughlin302.38%12.17%
greg kurzgreg kurz262.06%12.17%
joe perchesjoe perches211.66%24.35%
guido guentherguido guenther201.58%12.17%
david s. millerdavid s. miller161.27%36.52%
mathias krausemathias krause161.27%12.17%
gao fenggao feng131.03%24.35%
rusty russellrusty russell100.79%12.17%
harvey harrisonharvey harrison100.79%12.17%
arnd bergmannarnd bergmann80.63%12.17%
dave jonesdave jones50.40%12.17%
stephen hemmingerstephen hemminger30.24%12.17%
michal miroslawmichal miroslaw20.16%12.17%
toyo abetoyo abe20.16%12.17%
uwe kleine-koeniguwe kleine-koenig10.08%12.17%
Total1262100.00%46100.00%


static long tun_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); }

Contributors

PersonTokensPropCommitsCommitProp
arnd bergmannarnd bergmann35100.00%1100.00%
Total35100.00%1100.00%

#ifdef CONFIG_COMPAT
static long tun_chr_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { switch (cmd) { case TUNSETIFF: case TUNGETIFF: case TUNSETTXFILTER: case TUNGETSNDBUF: case TUNSETSNDBUF: case SIOCGIFHWADDR: case SIOCSIFHWADDR: arg = (unsigned long)compat_ptr(arg); break; default: arg = (compat_ulong_t)arg; break; } /* * compat_ifreq is shorter than ifreq, so we must not access beyond * the end of that structure. All fields that are used in this * driver are compatible though, we don't need to convert the * contents. */ return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); }

Contributors

PersonTokensPropCommitsCommitProp
arnd bergmannarnd bergmann84100.00%1100.00%
Total84100.00%1100.00%

#endif /* CONFIG_COMPAT */
static int tun_chr_fasync(int fd, struct file *file, int on) { struct tun_file *tfile = file->private_data; int ret; if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) goto out; if (on) { __f_setown(file, task_pid(current), PIDTYPE_PID, 0); tfile->flags |= TUN_FASYNC; } else tfile->flags &= ~TUN_FASYNC; ret = 0; out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git5758.76%116.67%
jonathan corbetjonathan corbet1010.31%116.67%
linus torvaldslinus torvalds99.28%116.67%
james morrisjames morris88.25%116.67%
jason wangjason wang77.22%116.67%
eric w. biedermaneric w. biederman66.19%116.67%
Total97100.00%6100.00%


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 = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto, 0); if (!tfile) return -ENOMEM; RCU_INIT_POINTER(tfile->tun, NULL); tfile->flags = 0; tfile->ifindex = 0; init_waitqueue_head(&tfile->wq.wait); RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); 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; INIT_LIST_HEAD(&tfile->next); sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang9550.80%428.57%
eric w. biedermaneric w. biederman4423.53%535.71%
pre-gitpre-git3016.04%17.14%
xi wangxi wang105.35%17.14%
pavel emelianovpavel emelianov63.21%17.14%
joe perchesjoe perches10.53%17.14%
monam agarwalmonam agarwal10.53%17.14%
Total187100.00%14100.00%


static int tun_chr_close(struct inode *inode, struct file *file) { struct tun_file *tfile = file->private_data; tun_detach(tfile, true); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git2674.29%116.67%
eric w. biedermaneric w. biederman411.43%233.33%
jason wangjason wang411.43%233.33%
herbert xuherbert xu12.86%116.67%
Total35100.00%6100.00%

#ifdef CONFIG_PROC_FS
static void tun_chr_show_fdinfo(struct seq_file *m, struct file *f) { struct tun_struct *tun; struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); rtnl_lock(); tun = tun_get(f); if (tun) tun_get_iff(current->nsproxy->net_ns, tun, &ifr); rtnl_unlock(); if (tun) tun_put(tun); seq_printf(m, "iff:\t%s\n", ifr.ifr_name); }

Contributors

PersonTokensPropCommitsCommitProp
masatake yamatomasatake yamato8797.75%150.00%
joe perchesjoe perches22.25%150.00%
Total89100.00%2100.00%

#endif static const struct file_operations tun_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .read_iter = tun_chr_read_iter, .write_iter = tun_chr_write_iter, .poll = tun_chr_poll, .unlocked_ioctl = tun_chr_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = tun_chr_compat_ioctl, #endif .open = tun_chr_open, .release = tun_chr_close, .fasync = tun_chr_fasync, #ifdef CONFIG_PROC_FS .show_fdinfo = tun_chr_show_fdinfo, #endif }; static struct miscdevice tun_miscdev = { .minor = TUN_MINOR, .name = "tun", .nodename = "net/tun", .fops = &tun_fops, }; /* ethtool interface */
static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) { cmd->supported = 0; cmd->advertising = 0; ethtool_cmd_speed_set(cmd, SPEED_10); cmd->duplex = DUPLEX_FULL; cmd->port = PORT_TP; cmd->phy_address = 0; cmd->transceiver = XCVR_INTERNAL; cmd->autoneg = AUTONEG_DISABLE; cmd->maxtxpkt = 0; cmd->maxrxpkt = 0; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy7695.00%150.00%
david decotignydavid decotigny45.00%150.00%
Total80100.00%2100.00%


static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) { struct tun_struct *tun = netdev_priv(dev); strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); strlcpy(info->version, DRV_VERSION, sizeof(info->version)); switch (tun->flags & TUN_TYPE_MASK) { case IFF_TUN: strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); break; case IFF_TAP: strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); break; } }

Contributors

PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy7468.52%133.33%
rick jonesrick jones3229.63%133.33%
michael s. tsirkinmichael s. tsirkin21.85%133.33%
Total108100.00%3100.00%


static u32 tun_get_msglevel(struct net_device *dev) { #ifdef TUN_DEBUG struct tun_struct *tun = netdev_priv(dev); return tun->debug; #else return -EOPNOTSUPP; #endif }

Contributors

PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy37100.00%1100.00%
Total37100.00%1100.00%


static void tun_set_msglevel(struct net_device *dev, u32 value) { #ifdef TUN_DEBUG struct tun_struct *tun = netdev_priv(dev); tun->debug = value; #endif }

Contributors

PersonTokensPropCommitsCommitProp
maksim krasnyanskiymaksim krasnyanskiy35100.00%1100.00%
Total35100.00%1100.00%

static const struct ethtool_ops tun_ethtool_ops = { .get_settings = tun_get_settings, .get_drvinfo = tun_get_drvinfo, .get_msglevel = tun_get_msglevel, .set_msglevel = tun_set_msglevel, .get_link = ethtool_op_get_link, .get_ts_info = ethtool_op_get_ts_info, };
static int tun_queue_resize(struct tun_struct *tun) { struct net_device *dev = tun->dev; struct tun_file *tfile; struct skb_array **arrays; int n = tun->numqueues + tun->numdisabled; int ret, i; arrays = kmalloc(sizeof *arrays * n, GFP_KERNEL); if (!arrays) return -ENOMEM; for (i = 0; i < tun->numqueues; i++) { tfile = rtnl_dereference(tun->tfiles[i]); arrays[i] = &tfile->tx_array; } list_for_each_entry(tfile, &tun->disabled, next) arrays[i++] = &tfile->tx_array; ret = skb_array_resize_multiple(arrays, n, dev->tx_queue_len, GFP_KERNEL); kfree(arrays); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang150100.00%1100.00%
Total150100.00%1100.00%


static int tun_device_event(struct notifier_block *unused, unsigned long event, void *ptr) { struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct tun_struct *tun = netdev_priv(dev); if (dev->rtnl_link_ops != &tun_link_ops) return NOTIFY_DONE; switch (event) { case NETDEV_CHANGE_TX_QUEUE_LEN: if (tun_queue_resize(tun)) return NOTIFY_BAD; break; default: break; } return NOTIFY_DONE; }

Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang6484.21%150.00%
craig gallekcraig gallek1215.79%150.00%
Total76100.00%2100.00%

static struct notifier_block tun_notifier_block __read_mostly = { .notifier_call = tun_device_event, };
static int __init tun_init(void) { int ret = 0; pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); pr_info("%s\n", DRV_COPYRIGHT); ret = rtnl_link_register(&tun_link_ops); if (ret) { pr_err("Can't register link_ops\n"); goto err_linkops; } ret = misc_register(&tun_miscdev); if (ret) { pr_err("Can't register misc device %d\n", TUN_MINOR); goto err_misc; } register_netdevice_notifier(&tun_notifier_block); return 0; err_misc: rtnl_link_unregister(&tun_link_ops); err_linkops: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
pavel emelianovpavel emelianov3232.65%111.11%
pre-gitpre-git2626.53%222.22%
stephen hemmingerstephen hemminger1212.24%111.11%
joe perchesjoe perches88.16%111.11%
maksim krasnyanskiymaksim krasnyanskiy77.14%111.11%
eric w. biedermaneric w. biederman66.12%111.11%
jason wangjason wang66.12%111.11%
adrian bunkadrian bunk11.02%111.11%
Total98100.00%9100.00%


static void tun_cleanup(void) { misc_deregister(&tun_miscdev); rtnl_link_unregister(&tun_link_ops); unregister_netdevice_notifier(&tun_notifier_block); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git1350.00%233.33%
jason wangjason wang623.08%116.67%
pavel emelianovpavel emelianov415.38%116.67%
eric w. biedermaneric w. biederman27.69%116.67%
adrian bunkadrian bunk13.85%116.67%
Total26100.00%6100.00%

/* 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 *tun_get_socket(struct file *file) { struct tun_file *tfile; if (file->f_op != &tun_fops) return ERR_PTR(-EINVAL); tfile = file->private_data; if (!tfile) return ERR_PTR(-EBADFD); return &tfile->socket; }

Contributors

PersonTokensPropCommitsCommitProp
michael s. tsirkinmichael s. tsirkin4884.21%133.33%
jason wangjason wang915.79%266.67%
Total57100.00%3100.00%

EXPORT_SYMBOL_GPL(tun_get_socket); module_init(tun_init); module_exit(tun_cleanup); MODULE_DESCRIPTION(DRV_DESCRIPTION); MODULE_AUTHOR(DRV_COPYRIGHT); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(TUN_MINOR); MODULE_ALIAS("devname:net/tun");

Overall Contributors

PersonTokensPropCommitsCommitProp
jason wangjason wang382033.07%4016.26%
maksim krasnyanskiymaksim krasnyanskiy9328.07%41.63%
michael s. tsirkinmichael s. tsirkin9097.87%156.10%
pre-gitpre-git9037.82%31.22%
eric w. biedermaneric w. biederman6415.55%156.10%
herbert xuherbert xu5134.44%124.88%
paolo abenipaolo abeni4694.06%41.63%
rusty russellrusty russell3723.22%62.44%
greg kurzgreg kurz2462.13%31.22%
pavel emelianovpavel emelianov2422.09%83.25%
david woodhousedavid woodhouse2141.85%31.22%
stephen hemmingerstephen hemminger2031.76%124.88%
linus torvaldslinus torvalds1891.64%52.03%
arnd bergmannarnd bergmann1461.26%10.41%
andrew mortonandrew morton1291.12%31.22%
tom herberttom herbert1191.03%20.81%
paul moorepaul moore1151.00%31.22%
masatake yamatomasatake yamato1060.92%10.41%
joe perchesjoe perches980.85%52.03%
al viroal viro830.72%52.03%
mark mcloughlinmark mcloughlin730.63%10.41%
michal miroslawmichal miroslaw650.56%20.81%
eric dumazeteric dumazet650.56%93.66%
ang way chuangang way chuang630.55%10.41%
hannes frederic sowahannes frederic sowa570.49%10.41%
david s. millerdavid s. miller560.48%62.44%
xi wangxi wang520.45%10.41%
mike kershawmike kershaw490.42%10.41%
takashi iwaitakashi iwai490.42%10.41%
neil hormanneil horman460.40%20.81%
richard cochranrichard cochran390.34%10.41%
rick jonesrick jones320.28%10.41%
guido guentherguido guenther250.22%10.41%
alex williamsonalex williamson250.22%10.41%
jarod wilsonjarod wilson240.21%10.41%
vlad yasevichvlad yasevich230.20%20.81%
gao fenggao feng230.20%31.22%
sven henkelsven henkel200.17%10.41%
andrey konovalovandrey konovalov180.16%10.41%
zhi yong wuzhi yong wu180.16%20.81%
mathias krausemathias krause160.14%10.41%
dave jonesdave jones160.14%20.81%
sf markus elfringsf markus elfring150.13%20.81%
dominic currandominic curran140.12%10.41%
dan carpenterdan carpenter130.11%10.41%
willem de bruijnwillem de bruijn130.11%10.41%
craig gallekcraig gallek120.10%10.41%
francois romieufrancois romieu120.10%10.41%
arnaldo carvalho de meloarnaldo carvalho de melo110.10%20.81%
harvey harrisonharvey harrison110.10%20.81%
jonathan corbetjonathan corbet100.09%10.41%
mike rapoportmike rapoport100.09%10.41%
kay sieverskay sievers100.09%31.22%
pravin b shelarpravin b shelar90.08%10.41%
randy dunlaprandy dunlap90.08%10.41%
james morrisjames morris80.07%10.41%
fernando luis vazquez caofernando luis vazquez cao70.06%10.41%
mikulas patockamikulas patocka60.05%10.41%
kusanagi kouichikusanagi kouichi50.04%20.81%
mariusz kozlowskimariusz kozlowski50.04%10.41%
badari pulavartybadari pulavarty50.04%10.41%
toshiaki makitatoshiaki makita50.04%10.41%
ed swierked swierk40.03%10.41%
jarno rajahalmejarno rajahalme40.03%10.41%
jeff garzikjeff garzik40.03%20.81%
monam agarwalmonam agarwal40.03%10.41%
david decotignydavid decotigny40.03%10.41%
alex gartrellalex gartrell40.03%20.81%
nathaniel filardonathaniel filardo40.03%10.41%
rami rosenrami rosen30.03%31.22%
daniel borkmanndaniel borkmann30.03%10.41%
jiri pirkojiri pirko30.03%20.81%
amos kongamos kong30.03%10.41%
nolan leakenolan leake30.03%10.41%
jamal hadi salimjamal hadi salim20.02%10.41%
pankaj guptapankaj gupta20.02%10.41%
toyo abetoyo abe20.02%10.41%
tom gundersentom gundersen20.02%10.41%
adrian bunkadrian bunk20.02%10.41%
uwe kleine-koeniguwe kleine-koenig10.01%10.41%
brian braunsteinbrian braunstein10.01%10.41%
patrick mchardypatrick mchardy10.01%10.41%
arjan van de venarjan van de ven10.01%10.41%
soheil hassas yeganehsoheil hassas yeganeh10.01%10.41%
danny kukawkadanny kukawka10.01%10.41%
Total11552100.00%246100.00%
Directory: drivers/net
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