diff options
Diffstat (limited to 'drivers/net/tun.c')
| -rw-r--r-- | drivers/net/tun.c | 132 |
1 files changed, 112 insertions, 20 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 7b816a032957..d91856b19f6f 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -62,18 +62,57 @@ #include <linux/if_ether.h> #include <linux/if_tun.h> #include <linux/crc32.h> +#include <linux/nsproxy.h> #include <net/net_namespace.h> +#include <net/netns/generic.h> #include <asm/system.h> #include <asm/uaccess.h> +/* Uncomment to enable debugging */ +/* #define TUN_DEBUG 1 */ + #ifdef TUN_DEBUG static int debug; + +#define DBG if(tun->debug)printk +#define DBG1 if(debug==2)printk +#else +#define DBG( a... ) +#define DBG1( a... ) +#endif + +struct tun_struct { + struct list_head list; + unsigned long flags; + int attached; + uid_t owner; + gid_t group; + + wait_queue_head_t read_wait; + struct sk_buff_head readq; + + struct net_device *dev; + + struct fasync_struct *fasync; + + unsigned long if_flags; + u8 dev_addr[ETH_ALEN]; + u32 chr_filter[2]; + u32 net_filter[2]; + +#ifdef TUN_DEBUG + int debug; #endif +}; /* Network device part of the driver */ -static LIST_HEAD(tun_dev_list); +static unsigned int tun_net_id; +struct tun_net { + struct list_head dev_list; +}; + static const struct ethtool_ops tun_ethtool_ops; /* Net device open. */ @@ -253,8 +292,11 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, return -EFAULT; } - if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) + if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { align = NET_IP_ALIGN; + if (unlikely(len < ETH_HLEN)) + return -EINVAL; + } if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { tun->dev->stats.rx_dropped++; @@ -435,14 +477,15 @@ static void tun_setup(struct net_device *dev) dev->stop = tun_net_close; dev->ethtool_ops = &tun_ethtool_ops; dev->destructor = free_netdev; + dev->features |= NETIF_F_NETNS_LOCAL; } -static struct tun_struct *tun_get_by_name(const char *name) +static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name) { struct tun_struct *tun; ASSERT_RTNL(); - list_for_each_entry(tun, &tun_dev_list, list) { + list_for_each_entry(tun, &tn->dev_list, list) { if (!strncmp(tun->dev->name, name, IFNAMSIZ)) return tun; } @@ -450,13 +493,15 @@ static struct tun_struct *tun_get_by_name(const char *name) return NULL; } -static int tun_set_iff(struct file *file, struct ifreq *ifr) +static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) { + struct tun_net *tn; struct tun_struct *tun; struct net_device *dev; int err; - tun = tun_get_by_name(ifr->ifr_name); + tn = net_generic(net, tun_net_id); + tun = tun_get_by_name(tn, ifr->ifr_name); if (tun) { if (tun->attached) return -EBUSY; @@ -469,7 +514,7 @@ static int tun_set_iff(struct file *file, struct ifreq *ifr) !capable(CAP_NET_ADMIN)) return -EPERM; } - else if (__dev_get_by_name(&init_net, ifr->ifr_name)) + else if (__dev_get_by_name(net, ifr->ifr_name)) return -EINVAL; else { char *name; @@ -500,6 +545,7 @@ static int tun_set_iff(struct file *file, struct ifreq *ifr) if (!dev) return -ENOMEM; + dev_net_set(dev, net); tun = netdev_priv(dev); tun->dev = dev; tun->flags = flags; @@ -522,7 +568,7 @@ static int tun_set_iff(struct file *file, struct ifreq *ifr) if (err < 0) goto err_free_dev; - list_add(&tun->list, &tun_dev_list); + list_add(&tun->list, &tn->dev_list); } DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); @@ -539,6 +585,7 @@ static int tun_set_iff(struct file *file, struct ifreq *ifr) file->private_data = tun; tun->attached = 1; + get_net(dev_net(tun->dev)); strcpy(ifr->ifr_name, tun->dev->name); return 0; @@ -567,7 +614,7 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file, ifr.ifr_name[IFNAMSIZ-1] = '\0'; rtnl_lock(); - err = tun_set_iff(file, &ifr); + err = tun_set_iff(current->nsproxy->net_ns, file, &ifr); rtnl_unlock(); if (err) @@ -754,6 +801,7 @@ static int tun_chr_close(struct inode *inode, struct file *file) /* Detach from net device */ file->private_data = NULL; tun->attached = 0; + put_net(dev_net(tun->dev)); /* Drop read queue */ skb_queue_purge(&tun->readq); @@ -873,32 +921,76 @@ static const struct ethtool_ops tun_ethtool_ops = { .set_rx_csum = tun_set_rx_csum }; -static int __init tun_init(void) +static int tun_init_net(struct net *net) { - int ret = 0; + struct tun_net *tn; - printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); - printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); + tn = kmalloc(sizeof(*tn), GFP_KERNEL); + if (tn == NULL) + return -ENOMEM; - ret = misc_register(&tun_miscdev); - if (ret) - printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); - return ret; + INIT_LIST_HEAD(&tn->dev_list); + + if (net_assign_generic(net, tun_net_id, tn)) { + kfree(tn); + return -ENOMEM; + } + + return 0; } -static void tun_cleanup(void) +static void tun_exit_net(struct net *net) { + struct tun_net *tn; struct tun_struct *tun, *nxt; - misc_deregister(&tun_miscdev); + tn = net_generic(net, tun_net_id); rtnl_lock(); - list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { + list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) { DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); unregister_netdevice(tun->dev); } rtnl_unlock(); + kfree(tn); +} + +static struct pernet_operations tun_net_ops = { + .init = tun_init_net, + .exit = tun_exit_net, +}; + +static int __init tun_init(void) +{ + int ret = 0; + + printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); + printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); + + ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops); + if (ret) { + printk(KERN_ERR "tun: Can't register pernet ops\n"); + goto err_pernet; + } + + ret = misc_register(&tun_miscdev); + if (ret) { + printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); + goto err_misc; + } + return 0; + +err_misc: + unregister_pernet_gen_device(tun_net_id, &tun_net_ops); +err_pernet: + return ret; +} + +static void tun_cleanup(void) +{ + misc_deregister(&tun_miscdev); + unregister_pernet_gen_device(tun_net_id, &tun_net_ops); } module_init(tun_init); |