![David S. Miller](/assets/img/avatar_default.png)
Conflicts: drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c drivers/net/ethernet/emulex/benet/be.h include/net/tcp.h net/mac802154/mac802154.h Most conflicts were minor overlapping stuff. The be2net driver brought in some fixes that added __vlan_put_tag calls, which in net-next take an additional argument. Signed-off-by: David S. Miller <davem@davemloft.net>
2311 lines
54 KiB
C
2311 lines
54 KiB
C
/*
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* TUN - Universal TUN/TAP device driver.
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* Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $
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*/
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/*
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* Changes:
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*
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* Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
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* Add TUNSETLINK ioctl to set the link encapsulation
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*
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* Mark Smith <markzzzsmith@yahoo.com.au>
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* Use eth_random_addr() for tap MAC address.
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*
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* Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20
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* Fixes in packet dropping, queue length setting and queue wakeup.
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* Increased default tx queue length.
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* Added ethtool API.
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* Minor cleanups
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*
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* Daniel Podlejski <underley@underley.eu.org>
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* Modifications for 2.3.99-pre5 kernel.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define DRV_NAME "tun"
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#define DRV_VERSION "1.6"
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#define DRV_DESCRIPTION "Universal TUN/TAP device driver"
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#define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/fcntl.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/miscdevice.h>
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#include <linux/ethtool.h>
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#include <linux/rtnetlink.h>
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#include <linux/compat.h>
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#include <linux/if.h>
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#include <linux/if_arp.h>
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#include <linux/if_ether.h>
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#include <linux/if_tun.h>
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#include <linux/crc32.h>
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#include <linux/nsproxy.h>
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#include <linux/virtio_net.h>
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#include <linux/rcupdate.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/rtnetlink.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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/* Uncomment to enable debugging */
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/* #define TUN_DEBUG 1 */
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#ifdef TUN_DEBUG
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static int debug;
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#define tun_debug(level, tun, fmt, args...) \
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do { \
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if (tun->debug) \
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netdev_printk(level, tun->dev, fmt, ##args); \
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} while (0)
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#define DBG1(level, fmt, args...) \
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do { \
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if (debug == 2) \
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printk(level fmt, ##args); \
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} while (0)
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#else
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#define tun_debug(level, tun, fmt, args...) \
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do { \
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if (0) \
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netdev_printk(level, tun->dev, fmt, ##args); \
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} while (0)
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#define DBG1(level, fmt, args...) \
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do { \
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if (0) \
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printk(level fmt, ##args); \
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} while (0)
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#endif
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#define GOODCOPY_LEN 128
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#define FLT_EXACT_COUNT 8
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struct tap_filter {
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unsigned int count; /* Number of addrs. Zero means disabled */
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u32 mask[2]; /* Mask of the hashed addrs */
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unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN];
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};
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/* DEFAULT_MAX_NUM_RSS_QUEUES were choosed to let the rx/tx queues allocated for
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* the netdevice to be fit in one page. So we can make sure the success of
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* memory allocation. TODO: increase the limit. */
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#define MAX_TAP_QUEUES DEFAULT_MAX_NUM_RSS_QUEUES
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#define MAX_TAP_FLOWS 4096
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#define TUN_FLOW_EXPIRE (3 * HZ)
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/* A tun_file connects an open character device to a tuntap netdevice. It
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* also contains all socket related strctures (except sock_fprog and tap_filter)
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* to serve as one transmit queue for tuntap device. The sock_fprog and
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* tap_filter were kept in tun_struct since they were used for filtering for the
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* netdevice not for a specific queue (at least I didn't see the requirement for
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* this).
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*
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* RCU usage:
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* The tun_file and tun_struct are loosely coupled, the pointer from one to the
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* other can only be read while rcu_read_lock or rtnl_lock is held.
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*/
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struct tun_file {
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struct sock sk;
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struct socket socket;
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struct socket_wq wq;
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struct tun_struct __rcu *tun;
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struct net *net;
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struct fasync_struct *fasync;
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/* only used for fasnyc */
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unsigned int flags;
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u16 queue_index;
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struct list_head next;
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struct tun_struct *detached;
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};
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struct tun_flow_entry {
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struct hlist_node hash_link;
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struct rcu_head rcu;
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struct tun_struct *tun;
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u32 rxhash;
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int queue_index;
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unsigned long updated;
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};
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#define TUN_NUM_FLOW_ENTRIES 1024
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/* Since the socket were moved to tun_file, to preserve the behavior of persist
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* device, socket filter, sndbuf and vnet header size were restore when the
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* file were attached to a persist device.
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*/
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struct tun_struct {
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struct tun_file __rcu *tfiles[MAX_TAP_QUEUES];
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unsigned int numqueues;
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unsigned int flags;
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kuid_t owner;
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kgid_t group;
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struct net_device *dev;
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netdev_features_t set_features;
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#define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \
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NETIF_F_TSO6|NETIF_F_UFO)
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int vnet_hdr_sz;
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int sndbuf;
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struct tap_filter txflt;
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struct sock_fprog fprog;
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/* protected by rtnl lock */
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bool filter_attached;
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#ifdef TUN_DEBUG
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int debug;
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#endif
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spinlock_t lock;
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struct hlist_head flows[TUN_NUM_FLOW_ENTRIES];
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struct timer_list flow_gc_timer;
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unsigned long ageing_time;
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unsigned int numdisabled;
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struct list_head disabled;
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void *security;
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u32 flow_count;
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};
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static inline u32 tun_hashfn(u32 rxhash)
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{
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return rxhash & 0x3ff;
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}
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static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash)
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{
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struct tun_flow_entry *e;
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hlist_for_each_entry_rcu(e, head, hash_link) {
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if (e->rxhash == rxhash)
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return e;
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}
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return NULL;
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}
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static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun,
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struct hlist_head *head,
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u32 rxhash, u16 queue_index)
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{
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struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC);
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if (e) {
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tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n",
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rxhash, queue_index);
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e->updated = jiffies;
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e->rxhash = rxhash;
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e->queue_index = queue_index;
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e->tun = tun;
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hlist_add_head_rcu(&e->hash_link, head);
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++tun->flow_count;
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}
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return e;
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}
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static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e)
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{
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tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n",
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e->rxhash, e->queue_index);
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hlist_del_rcu(&e->hash_link);
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kfree_rcu(e, rcu);
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--tun->flow_count;
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}
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static void tun_flow_flush(struct tun_struct *tun)
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{
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int i;
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spin_lock_bh(&tun->lock);
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for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) {
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struct tun_flow_entry *e;
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struct hlist_node *n;
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hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link)
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tun_flow_delete(tun, e);
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}
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spin_unlock_bh(&tun->lock);
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}
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static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index)
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{
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int i;
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spin_lock_bh(&tun->lock);
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for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) {
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struct tun_flow_entry *e;
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struct hlist_node *n;
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hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) {
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if (e->queue_index == queue_index)
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tun_flow_delete(tun, e);
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}
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}
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spin_unlock_bh(&tun->lock);
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}
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static void tun_flow_cleanup(unsigned long data)
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{
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struct tun_struct *tun = (struct tun_struct *)data;
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unsigned long delay = tun->ageing_time;
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unsigned long next_timer = jiffies + delay;
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unsigned long count = 0;
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int i;
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tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n");
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spin_lock_bh(&tun->lock);
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for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) {
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struct tun_flow_entry *e;
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struct hlist_node *n;
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hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) {
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unsigned long this_timer;
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count++;
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this_timer = e->updated + delay;
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if (time_before_eq(this_timer, jiffies))
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tun_flow_delete(tun, e);
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else if (time_before(this_timer, next_timer))
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next_timer = this_timer;
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}
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}
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if (count)
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mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer));
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spin_unlock_bh(&tun->lock);
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}
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static void tun_flow_update(struct tun_struct *tun, u32 rxhash,
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struct tun_file *tfile)
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{
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struct hlist_head *head;
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struct tun_flow_entry *e;
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unsigned long delay = tun->ageing_time;
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u16 queue_index = tfile->queue_index;
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if (!rxhash)
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return;
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else
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head = &tun->flows[tun_hashfn(rxhash)];
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rcu_read_lock();
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/* We may get a very small possibility of OOO during switching, not
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* worth to optimize.*/
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if (tun->numqueues == 1 || tfile->detached)
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goto unlock;
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e = tun_flow_find(head, rxhash);
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if (likely(e)) {
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/* TODO: keep queueing to old queue until it's empty? */
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e->queue_index = queue_index;
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e->updated = jiffies;
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} else {
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spin_lock_bh(&tun->lock);
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if (!tun_flow_find(head, rxhash) &&
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tun->flow_count < MAX_TAP_FLOWS)
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tun_flow_create(tun, head, rxhash, queue_index);
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if (!timer_pending(&tun->flow_gc_timer))
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mod_timer(&tun->flow_gc_timer,
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round_jiffies_up(jiffies + delay));
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spin_unlock_bh(&tun->lock);
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}
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unlock:
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rcu_read_unlock();
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}
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/* We try to identify a flow through its rxhash first. The reason that
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* we do not check rxq no. is becuase some cards(e.g 82599), chooses
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* the rxq based on the txq where the last packet of the flow comes. As
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* the userspace application move between processors, we may get a
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* different rxq no. here. If we could not get rxhash, then we would
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* hope the rxq no. may help here.
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*/
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static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb)
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{
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struct tun_struct *tun = netdev_priv(dev);
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struct tun_flow_entry *e;
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u32 txq = 0;
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u32 numqueues = 0;
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rcu_read_lock();
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numqueues = tun->numqueues;
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txq = skb_get_rxhash(skb);
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if (txq) {
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e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq);
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if (e)
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txq = e->queue_index;
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else
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/* use multiply and shift instead of expensive divide */
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txq = ((u64)txq * numqueues) >> 32;
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} else if (likely(skb_rx_queue_recorded(skb))) {
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txq = skb_get_rx_queue(skb);
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while (unlikely(txq >= numqueues))
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txq -= numqueues;
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}
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rcu_read_unlock();
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return txq;
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}
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static inline bool tun_not_capable(struct tun_struct *tun)
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{
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const struct cred *cred = current_cred();
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struct net *net = dev_net(tun->dev);
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return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) ||
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(gid_valid(tun->group) && !in_egroup_p(tun->group))) &&
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!ns_capable(net->user_ns, CAP_NET_ADMIN);
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}
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static void tun_set_real_num_queues(struct tun_struct *tun)
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{
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netif_set_real_num_tx_queues(tun->dev, tun->numqueues);
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netif_set_real_num_rx_queues(tun->dev, tun->numqueues);
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}
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static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile)
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{
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tfile->detached = tun;
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list_add_tail(&tfile->next, &tun->disabled);
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++tun->numdisabled;
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}
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static struct tun_struct *tun_enable_queue(struct tun_file *tfile)
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{
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struct tun_struct *tun = tfile->detached;
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tfile->detached = NULL;
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list_del_init(&tfile->next);
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--tun->numdisabled;
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return tun;
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}
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static void __tun_detach(struct tun_file *tfile, bool clean)
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{
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struct tun_file *ntfile;
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struct tun_struct *tun;
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tun = rtnl_dereference(tfile->tun);
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if (tun && !tfile->detached) {
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u16 index = tfile->queue_index;
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BUG_ON(index >= tun->numqueues);
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rcu_assign_pointer(tun->tfiles[index],
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tun->tfiles[tun->numqueues - 1]);
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ntfile = rtnl_dereference(tun->tfiles[index]);
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ntfile->queue_index = index;
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--tun->numqueues;
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if (clean) {
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rcu_assign_pointer(tfile->tun, NULL);
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sock_put(&tfile->sk);
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} else
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tun_disable_queue(tun, tfile);
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synchronize_net();
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tun_flow_delete_by_queue(tun, tun->numqueues + 1);
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/* Drop read queue */
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skb_queue_purge(&tfile->sk.sk_receive_queue);
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tun_set_real_num_queues(tun);
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} else if (tfile->detached && clean) {
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tun = tun_enable_queue(tfile);
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sock_put(&tfile->sk);
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}
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if (clean) {
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if (tun && tun->numqueues == 0 && tun->numdisabled == 0) {
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netif_carrier_off(tun->dev);
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if (!(tun->flags & TUN_PERSIST) &&
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tun->dev->reg_state == NETREG_REGISTERED)
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unregister_netdevice(tun->dev);
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}
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BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED,
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&tfile->socket.flags));
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sk_release_kernel(&tfile->sk);
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}
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}
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static void tun_detach(struct tun_file *tfile, bool clean)
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{
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rtnl_lock();
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__tun_detach(tfile, clean);
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rtnl_unlock();
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}
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static void tun_detach_all(struct net_device *dev)
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{
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struct tun_struct *tun = netdev_priv(dev);
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struct tun_file *tfile, *tmp;
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int i, n = tun->numqueues;
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for (i = 0; i < n; i++) {
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tfile = rtnl_dereference(tun->tfiles[i]);
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BUG_ON(!tfile);
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wake_up_all(&tfile->wq.wait);
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rcu_assign_pointer(tfile->tun, NULL);
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--tun->numqueues;
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}
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list_for_each_entry(tfile, &tun->disabled, next) {
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wake_up_all(&tfile->wq.wait);
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rcu_assign_pointer(tfile->tun, NULL);
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}
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BUG_ON(tun->numqueues != 0);
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synchronize_net();
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for (i = 0; i < n; i++) {
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tfile = rtnl_dereference(tun->tfiles[i]);
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/* Drop read queue */
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skb_queue_purge(&tfile->sk.sk_receive_queue);
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sock_put(&tfile->sk);
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}
|
|
list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) {
|
|
tun_enable_queue(tfile);
|
|
skb_queue_purge(&tfile->sk.sk_receive_queue);
|
|
sock_put(&tfile->sk);
|
|
}
|
|
BUG_ON(tun->numdisabled != 0);
|
|
|
|
if (tun->flags & TUN_PERSIST)
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
static int tun_attach(struct tun_struct *tun, struct file *file)
|
|
{
|
|
struct tun_file *tfile = file->private_data;
|
|
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 & TUN_TAP_MQ) && 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 presist device */
|
|
if (tun->filter_attached == true) {
|
|
err = sk_attach_filter(&tun->fprog, tfile->socket.sk);
|
|
if (!err)
|
|
goto out;
|
|
}
|
|
tfile->queue_index = tun->numqueues;
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static struct tun_struct *tun_get(struct file *file)
|
|
{
|
|
return __tun_get(file->private_data);
|
|
}
|
|
|
|
static void tun_put(struct tun_struct *tun)
|
|
{
|
|
dev_put(tun->dev);
|
|
}
|
|
|
|
/* 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));
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
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 = kmalloc(alen, GFP_KERNEL);
|
|
if (!addr)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(addr, arg + sizeof(uf), alen)) {
|
|
err = -EFAULT;
|
|
goto done;
|
|
}
|
|
|
|
/* 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 done;
|
|
}
|
|
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;
|
|
|
|
done:
|
|
kfree(addr);
|
|
return err;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* Net device open. */
|
|
static int tun_net_open(struct net_device *dev)
|
|
{
|
|
netif_tx_start_all_queues(dev);
|
|
return 0;
|
|
}
|
|
|
|
/* Net device close. */
|
|
static int tun_net_close(struct net_device *dev)
|
|
{
|
|
netif_tx_stop_all_queues(dev);
|
|
return 0;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
rcu_read_lock();
|
|
tfile = rcu_dereference(tun->tfiles[txq]);
|
|
|
|
/* Drop packet if interface is not attached */
|
|
if (txq >= tun->numqueues)
|
|
goto drop;
|
|
|
|
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;
|
|
|
|
/* Limit the number of packets queued by dividing txq length with the
|
|
* number of queues.
|
|
*/
|
|
if (skb_queue_len(&tfile->socket.sk->sk_receive_queue)
|
|
>= dev->tx_queue_len / tun->numqueues)
|
|
goto drop;
|
|
|
|
/* Orphan the skb - required as we might hang on to it
|
|
* for indefinite time. */
|
|
if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
|
|
goto drop;
|
|
skb_orphan(skb);
|
|
|
|
nf_reset(skb);
|
|
|
|
/* Enqueue packet */
|
|
skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb);
|
|
|
|
/* Notify and wake up reader process */
|
|
if (tfile->flags & TUN_FASYNC)
|
|
kill_fasync(&tfile->fasync, SIGIO, POLL_IN);
|
|
wake_up_interruptible_poll(&tfile->wq.wait, POLLIN |
|
|
POLLRDNORM | POLLRDBAND);
|
|
|
|
rcu_read_unlock();
|
|
return NETDEV_TX_OK;
|
|
|
|
drop:
|
|
dev->stats.tx_dropped++;
|
|
skb_tx_error(skb);
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
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.
|
|
*/
|
|
}
|
|
|
|
#define MIN_MTU 68
|
|
#define MAX_MTU 65535
|
|
|
|
static int
|
|
tun_net_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
|
|
return -EINVAL;
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
#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 syncronous operations, we are guaranteed
|
|
* never to have pending data when we poll for it
|
|
* so theres 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;
|
|
}
|
|
#endif
|
|
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_change_mtu = tun_net_change_mtu,
|
|
.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
|
|
};
|
|
|
|
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_change_mtu = tun_net_change_mtu,
|
|
.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
|
|
};
|
|
|
|
static int 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));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tun_flow_uninit(struct tun_struct *tun)
|
|
{
|
|
del_timer_sync(&tun->flow_gc_timer);
|
|
tun_flow_flush(tun);
|
|
}
|
|
|
|
/* 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 TUN_TUN_DEV:
|
|
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;
|
|
dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
|
|
break;
|
|
|
|
case TUN_TAP_DEV:
|
|
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);
|
|
|
|
dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* 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, &tfile->wq.wait, wait);
|
|
|
|
if (!skb_queue_empty(&sk->sk_receive_queue))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
if (sock_writeable(sk) ||
|
|
(!test_and_set_bit(SOCK_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;
|
|
}
|
|
|
|
/* 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);
|
|
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;
|
|
}
|
|
|
|
/* set skb frags from iovec, this can move to core network code for reuse */
|
|
static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
|
|
int offset, size_t count)
|
|
{
|
|
int len = iov_length(from, count) - offset;
|
|
int copy = skb_headlen(skb);
|
|
int size, offset1 = 0;
|
|
int i = 0;
|
|
|
|
/* Skip over from offset */
|
|
while (count && (offset >= from->iov_len)) {
|
|
offset -= from->iov_len;
|
|
++from;
|
|
--count;
|
|
}
|
|
|
|
/* copy up to skb headlen */
|
|
while (count && (copy > 0)) {
|
|
size = min_t(unsigned int, copy, from->iov_len - offset);
|
|
if (copy_from_user(skb->data + offset1, from->iov_base + offset,
|
|
size))
|
|
return -EFAULT;
|
|
if (copy > size) {
|
|
++from;
|
|
--count;
|
|
offset = 0;
|
|
} else
|
|
offset += size;
|
|
copy -= size;
|
|
offset1 += size;
|
|
}
|
|
|
|
if (len == offset1)
|
|
return 0;
|
|
|
|
while (count--) {
|
|
struct page *page[MAX_SKB_FRAGS];
|
|
int num_pages;
|
|
unsigned long base;
|
|
unsigned long truesize;
|
|
|
|
len = from->iov_len - offset;
|
|
if (!len) {
|
|
offset = 0;
|
|
++from;
|
|
continue;
|
|
}
|
|
base = (unsigned long)from->iov_base + offset;
|
|
size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
|
|
if (i + size > MAX_SKB_FRAGS)
|
|
return -EMSGSIZE;
|
|
num_pages = get_user_pages_fast(base, size, 0, &page[i]);
|
|
if (num_pages != size) {
|
|
for (i = 0; i < num_pages; i++)
|
|
put_page(page[i]);
|
|
return -EFAULT;
|
|
}
|
|
truesize = size * PAGE_SIZE;
|
|
skb->data_len += len;
|
|
skb->len += len;
|
|
skb->truesize += truesize;
|
|
atomic_add(truesize, &skb->sk->sk_wmem_alloc);
|
|
while (len) {
|
|
int off = base & ~PAGE_MASK;
|
|
int size = min_t(int, len, PAGE_SIZE - off);
|
|
__skb_fill_page_desc(skb, i, page[i], off, size);
|
|
skb_shinfo(skb)->nr_frags++;
|
|
/* increase sk_wmem_alloc */
|
|
base += size;
|
|
len -= size;
|
|
i++;
|
|
}
|
|
offset = 0;
|
|
++from;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Get packet from user space buffer */
|
|
static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
|
|
void *msg_control, const struct iovec *iv,
|
|
size_t total_len, size_t count, int noblock)
|
|
{
|
|
struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) };
|
|
struct sk_buff *skb;
|
|
size_t len = total_len, align = NET_SKB_PAD;
|
|
struct virtio_net_hdr gso = { 0 };
|
|
int offset = 0;
|
|
int copylen;
|
|
bool zerocopy = false;
|
|
int err;
|
|
u32 rxhash;
|
|
|
|
if (!(tun->flags & TUN_NO_PI)) {
|
|
if ((len -= sizeof(pi)) > total_len)
|
|
return -EINVAL;
|
|
|
|
if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi)))
|
|
return -EFAULT;
|
|
offset += sizeof(pi);
|
|
}
|
|
|
|
if (tun->flags & TUN_VNET_HDR) {
|
|
if ((len -= tun->vnet_hdr_sz) > total_len)
|
|
return -EINVAL;
|
|
|
|
if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso)))
|
|
return -EFAULT;
|
|
|
|
if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
|
|
gso.csum_start + gso.csum_offset + 2 > gso.hdr_len)
|
|
gso.hdr_len = gso.csum_start + gso.csum_offset + 2;
|
|
|
|
if (gso.hdr_len > len)
|
|
return -EINVAL;
|
|
offset += tun->vnet_hdr_sz;
|
|
}
|
|
|
|
if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
|
|
align += NET_IP_ALIGN;
|
|
if (unlikely(len < ETH_HLEN ||
|
|
(gso.hdr_len && gso.hdr_len < ETH_HLEN)))
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (msg_control)
|
|
zerocopy = true;
|
|
|
|
if (zerocopy) {
|
|
/* Userspace may produce vectors with count greater than
|
|
* MAX_SKB_FRAGS, so we need to linearize parts of the skb
|
|
* to let the rest of data to be fit in the frags.
|
|
*/
|
|
if (count > MAX_SKB_FRAGS) {
|
|
copylen = iov_length(iv, count - MAX_SKB_FRAGS);
|
|
if (copylen < offset)
|
|
copylen = 0;
|
|
else
|
|
copylen -= offset;
|
|
} else
|
|
copylen = 0;
|
|
/* 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.
|
|
*/
|
|
if (copylen < gso.hdr_len)
|
|
copylen = gso.hdr_len;
|
|
if (!copylen)
|
|
copylen = GOODCOPY_LEN;
|
|
} else
|
|
copylen = len;
|
|
|
|
skb = tun_alloc_skb(tfile, align, copylen, gso.hdr_len, noblock);
|
|
if (IS_ERR(skb)) {
|
|
if (PTR_ERR(skb) != -EAGAIN)
|
|
tun->dev->stats.rx_dropped++;
|
|
return PTR_ERR(skb);
|
|
}
|
|
|
|
if (zerocopy)
|
|
err = zerocopy_sg_from_iovec(skb, iv, offset, count);
|
|
else
|
|
err = skb_copy_datagram_from_iovec(skb, 0, iv, offset, len);
|
|
|
|
if (err) {
|
|
tun->dev->stats.rx_dropped++;
|
|
kfree_skb(skb);
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
|
|
if (!skb_partial_csum_set(skb, gso.csum_start,
|
|
gso.csum_offset)) {
|
|
tun->dev->stats.rx_frame_errors++;
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
switch (tun->flags & TUN_TYPE_MASK) {
|
|
case TUN_TUN_DEV:
|
|
if (tun->flags & TUN_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:
|
|
tun->dev->stats.rx_dropped++;
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
skb_reset_mac_header(skb);
|
|
skb->protocol = pi.proto;
|
|
skb->dev = tun->dev;
|
|
break;
|
|
case TUN_TAP_DEV:
|
|
skb->protocol = eth_type_trans(skb, tun->dev);
|
|
break;
|
|
}
|
|
|
|
if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
|
|
pr_debug("GSO!\n");
|
|
switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
|
|
case VIRTIO_NET_HDR_GSO_TCPV4:
|
|
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
|
|
break;
|
|
case VIRTIO_NET_HDR_GSO_TCPV6:
|
|
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
|
|
break;
|
|
case VIRTIO_NET_HDR_GSO_UDP:
|
|
skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
|
|
break;
|
|
default:
|
|
tun->dev->stats.rx_frame_errors++;
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
|
|
|
|
skb_shinfo(skb)->gso_size = gso.gso_size;
|
|
if (skb_shinfo(skb)->gso_size == 0) {
|
|
tun->dev->stats.rx_frame_errors++;
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Header must be checked, and gso_segs computed. */
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
|
|
skb_shinfo(skb)->gso_segs = 0;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
skb_reset_network_header(skb);
|
|
skb_probe_transport_header(skb, 0);
|
|
|
|
rxhash = skb_get_rxhash(skb);
|
|
netif_rx_ni(skb);
|
|
|
|
tun->dev->stats.rx_packets++;
|
|
tun->dev->stats.rx_bytes += len;
|
|
|
|
tun_flow_update(tun, rxhash, tfile);
|
|
return total_len;
|
|
}
|
|
|
|
static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
|
|
unsigned long count, loff_t pos)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct tun_struct *tun = tun_get(file);
|
|
struct tun_file *tfile = file->private_data;
|
|
ssize_t result;
|
|
|
|
if (!tun)
|
|
return -EBADFD;
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count);
|
|
|
|
result = tun_get_user(tun, tfile, NULL, iv, iov_length(iv, count),
|
|
count, file->f_flags & O_NONBLOCK);
|
|
|
|
tun_put(tun);
|
|
return result;
|
|
}
|
|
|
|
/* Put packet to the user space buffer */
|
|
static ssize_t tun_put_user(struct tun_struct *tun,
|
|
struct tun_file *tfile,
|
|
struct sk_buff *skb,
|
|
const struct iovec *iv, int len)
|
|
{
|
|
struct tun_pi pi = { 0, skb->protocol };
|
|
ssize_t total = 0;
|
|
|
|
if (!(tun->flags & TUN_NO_PI)) {
|
|
if ((len -= sizeof(pi)) < 0)
|
|
return -EINVAL;
|
|
|
|
if (len < skb->len) {
|
|
/* Packet will be striped */
|
|
pi.flags |= TUN_PKT_STRIP;
|
|
}
|
|
|
|
if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi)))
|
|
return -EFAULT;
|
|
total += sizeof(pi);
|
|
}
|
|
|
|
if (tun->flags & TUN_VNET_HDR) {
|
|
struct virtio_net_hdr gso = { 0 }; /* no info leak */
|
|
if ((len -= tun->vnet_hdr_sz) < 0)
|
|
return -EINVAL;
|
|
|
|
if (skb_is_gso(skb)) {
|
|
struct skb_shared_info *sinfo = skb_shinfo(skb);
|
|
|
|
/* This is a hint as to how much should be linear. */
|
|
gso.hdr_len = skb_headlen(skb);
|
|
gso.gso_size = sinfo->gso_size;
|
|
if (sinfo->gso_type & SKB_GSO_TCPV4)
|
|
gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
|
|
else if (sinfo->gso_type & SKB_GSO_TCPV6)
|
|
gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
|
|
else if (sinfo->gso_type & SKB_GSO_UDP)
|
|
gso.gso_type = VIRTIO_NET_HDR_GSO_UDP;
|
|
else {
|
|
pr_err("unexpected GSO type: "
|
|
"0x%x, gso_size %d, hdr_len %d\n",
|
|
sinfo->gso_type, gso.gso_size,
|
|
gso.hdr_len);
|
|
print_hex_dump(KERN_ERR, "tun: ",
|
|
DUMP_PREFIX_NONE,
|
|
16, 1, skb->head,
|
|
min((int)gso.hdr_len, 64), true);
|
|
WARN_ON_ONCE(1);
|
|
return -EINVAL;
|
|
}
|
|
if (sinfo->gso_type & SKB_GSO_TCP_ECN)
|
|
gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
|
|
} else
|
|
gso.gso_type = VIRTIO_NET_HDR_GSO_NONE;
|
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
|
|
gso.csum_start = skb_checksum_start_offset(skb);
|
|
gso.csum_offset = skb->csum_offset;
|
|
} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
|
|
gso.flags = VIRTIO_NET_HDR_F_DATA_VALID;
|
|
} /* else everything is zero */
|
|
|
|
if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total,
|
|
sizeof(gso))))
|
|
return -EFAULT;
|
|
total += tun->vnet_hdr_sz;
|
|
}
|
|
|
|
len = min_t(int, skb->len, len);
|
|
|
|
skb_copy_datagram_const_iovec(skb, 0, iv, total, len);
|
|
total += skb->len;
|
|
|
|
tun->dev->stats.tx_packets++;
|
|
tun->dev->stats.tx_bytes += len;
|
|
|
|
return total;
|
|
}
|
|
|
|
static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,
|
|
struct kiocb *iocb, const struct iovec *iv,
|
|
ssize_t len, int noblock)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
struct sk_buff *skb;
|
|
ssize_t ret = 0;
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_do_read\n");
|
|
|
|
if (unlikely(!noblock))
|
|
add_wait_queue(&tfile->wq.wait, &wait);
|
|
while (len) {
|
|
current->state = TASK_INTERRUPTIBLE;
|
|
|
|
/* Read frames from the queue */
|
|
if (!(skb = skb_dequeue(&tfile->socket.sk->sk_receive_queue))) {
|
|
if (noblock) {
|
|
ret = -EAGAIN;
|
|
break;
|
|
}
|
|
if (signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
if (tun->dev->reg_state != NETREG_REGISTERED) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
|
|
/* Nothing to read, let's sleep */
|
|
schedule();
|
|
continue;
|
|
}
|
|
|
|
ret = tun_put_user(tun, tfile, skb, iv, len);
|
|
kfree_skb(skb);
|
|
break;
|
|
}
|
|
|
|
current->state = TASK_RUNNING;
|
|
if (unlikely(!noblock))
|
|
remove_wait_queue(&tfile->wq.wait, &wait);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
|
|
unsigned long count, loff_t pos)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct tun_file *tfile = file->private_data;
|
|
struct tun_struct *tun = __tun_get(tfile);
|
|
ssize_t len, ret;
|
|
|
|
if (!tun)
|
|
return -EBADFD;
|
|
len = iov_length(iv, count);
|
|
if (len < 0) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ret = tun_do_read(tun, tfile, iocb, iv, len,
|
|
file->f_flags & O_NONBLOCK);
|
|
ret = min_t(ssize_t, ret, len);
|
|
out:
|
|
tun_put(tun);
|
|
return ret;
|
|
}
|
|
|
|
static void tun_free_netdev(struct net_device *dev)
|
|
{
|
|
struct tun_struct *tun = netdev_priv(dev);
|
|
|
|
BUG_ON(!(list_empty(&tun->disabled)));
|
|
tun_flow_uninit(tun);
|
|
security_tun_dev_free_security(tun->security);
|
|
free_netdev(dev);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
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(SOCK_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);
|
|
}
|
|
|
|
static int tun_sendmsg(struct kiocb *iocb, 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_iov, total_len,
|
|
m->msg_iovlen, m->msg_flags & MSG_DONTWAIT);
|
|
tun_put(tun);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int tun_recvmsg(struct kiocb *iocb, 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)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
ret = tun_do_read(tun, tfile, iocb, m->msg_iov, total_len,
|
|
flags & MSG_DONTWAIT);
|
|
if (ret > total_len) {
|
|
m->msg_flags |= MSG_TRUNC;
|
|
ret = flags & MSG_TRUNC ? ret : total_len;
|
|
}
|
|
out:
|
|
tun_put(tun);
|
|
return ret;
|
|
}
|
|
|
|
static int tun_release(struct socket *sock)
|
|
{
|
|
if (sock->sk)
|
|
sock_put(sock->sk);
|
|
return 0;
|
|
}
|
|
|
|
/* Ops structure to mimic raw sockets with tun */
|
|
static const struct proto_ops tun_socket_ops = {
|
|
.sendmsg = tun_sendmsg,
|
|
.recvmsg = tun_recvmsg,
|
|
.release = tun_release,
|
|
};
|
|
|
|
static struct proto tun_proto = {
|
|
.name = "tun",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct tun_file),
|
|
};
|
|
|
|
static int tun_flags(struct tun_struct *tun)
|
|
{
|
|
int flags = 0;
|
|
|
|
if (tun->flags & TUN_TUN_DEV)
|
|
flags |= IFF_TUN;
|
|
else
|
|
flags |= IFF_TAP;
|
|
|
|
if (tun->flags & TUN_NO_PI)
|
|
flags |= IFF_NO_PI;
|
|
|
|
/* This flag has no real effect. We track the value for backwards
|
|
* compatibility.
|
|
*/
|
|
if (tun->flags & TUN_ONE_QUEUE)
|
|
flags |= IFF_ONE_QUEUE;
|
|
|
|
if (tun->flags & TUN_VNET_HDR)
|
|
flags |= IFF_VNET_HDR;
|
|
|
|
if (tun->flags & TUN_TAP_MQ)
|
|
flags |= IFF_MULTI_QUEUE;
|
|
|
|
return flags;
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
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");
|
|
}
|
|
|
|
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");
|
|
}
|
|
|
|
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 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 (tun_not_capable(tun))
|
|
return -EPERM;
|
|
err = security_tun_dev_open(tun->security);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = tun_attach(tun, file);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tun->flags & TUN_TAP_MQ &&
|
|
(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 |= TUN_TUN_DEV;
|
|
name = "tun%d";
|
|
} else if (ifr->ifr_flags & IFF_TAP) {
|
|
/* TAP device */
|
|
flags |= TUN_TAP_DEV;
|
|
name = "tap%d";
|
|
} else
|
|
return -EINVAL;
|
|
|
|
if (*ifr->ifr_name)
|
|
name = ifr->ifr_name;
|
|
|
|
dev = alloc_netdev_mqs(sizeof(struct tun_struct), name,
|
|
tun_setup, queues, queues);
|
|
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
dev_net_set(dev, net);
|
|
dev->rtnl_link_ops = &tun_link_ops;
|
|
|
|
tun = netdev_priv(dev);
|
|
tun->dev = dev;
|
|
tun->flags = flags;
|
|
tun->txflt.count = 0;
|
|
tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
|
|
|
|
tun->filter_attached = false;
|
|
tun->sndbuf = tfile->socket.sk->sk_sndbuf;
|
|
|
|
spin_lock_init(&tun->lock);
|
|
|
|
err = security_tun_dev_alloc_security(&tun->security);
|
|
if (err < 0)
|
|
goto err_free_dev;
|
|
|
|
tun_net_init(dev);
|
|
|
|
err = tun_flow_init(tun);
|
|
if (err < 0)
|
|
goto err_free_dev;
|
|
|
|
dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST |
|
|
TUN_USER_FEATURES;
|
|
dev->features = dev->hw_features;
|
|
dev->vlan_features = dev->features;
|
|
|
|
INIT_LIST_HEAD(&tun->disabled);
|
|
err = tun_attach(tun, file);
|
|
if (err < 0)
|
|
goto err_free_dev;
|
|
|
|
err = register_netdevice(tun->dev);
|
|
if (err < 0)
|
|
goto err_free_dev;
|
|
|
|
if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
|
|
device_create_file(&tun->dev->dev, &dev_attr_owner) ||
|
|
device_create_file(&tun->dev->dev, &dev_attr_group))
|
|
pr_err("Failed to create tun sysfs files\n");
|
|
}
|
|
|
|
netif_carrier_on(tun->dev);
|
|
|
|
tun_debug(KERN_INFO, tun, "tun_set_iff\n");
|
|
|
|
if (ifr->ifr_flags & IFF_NO_PI)
|
|
tun->flags |= TUN_NO_PI;
|
|
else
|
|
tun->flags &= ~TUN_NO_PI;
|
|
|
|
/* This flag has no real effect. We track the value for backwards
|
|
* compatibility.
|
|
*/
|
|
if (ifr->ifr_flags & IFF_ONE_QUEUE)
|
|
tun->flags |= TUN_ONE_QUEUE;
|
|
else
|
|
tun->flags &= ~TUN_ONE_QUEUE;
|
|
|
|
if (ifr->ifr_flags & IFF_VNET_HDR)
|
|
tun->flags |= TUN_VNET_HDR;
|
|
else
|
|
tun->flags &= ~TUN_VNET_HDR;
|
|
|
|
if (ifr->ifr_flags & IFF_MULTI_QUEUE)
|
|
tun->flags |= TUN_TAP_MQ;
|
|
else
|
|
tun->flags &= ~TUN_TAP_MQ;
|
|
|
|
/* 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_free_dev:
|
|
free_netdev(dev);
|
|
return err;
|
|
}
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
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]);
|
|
sk_detach_filter(tfile->socket.sk);
|
|
}
|
|
|
|
tun->filter_attached = false;
|
|
}
|
|
|
|
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]);
|
|
ret = sk_attach_filter(&tun->fprog, tfile->socket.sk);
|
|
if (ret) {
|
|
tun_detach_filter(tun, i);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
tun->filter_attached = true;
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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);
|
|
} else if (ifr->ifr_flags & IFF_DETACH_QUEUE) {
|
|
tun = rtnl_dereference(tfile->tun);
|
|
if (!tun || !(tun->flags & TUN_TAP_MQ) || tfile->detached)
|
|
ret = -EINVAL;
|
|
else
|
|
__tun_detach(tfile, false);
|
|
} else
|
|
ret = -EINVAL;
|
|
|
|
unlock:
|
|
rtnl_unlock();
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
int ret;
|
|
|
|
if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) {
|
|
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 | IFF_NO_PI | IFF_ONE_QUEUE |
|
|
IFF_VNET_HDR | IFF_MULTI_QUEUE,
|
|
(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 && !tun) {
|
|
ifr.ifr_name[IFNAMSIZ-1] = '\0';
|
|
|
|
ret = tun_set_iff(tfile->net, file, &ifr);
|
|
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
if (copy_to_user(argp, &ifr, ifreq_len))
|
|
ret = -EFAULT;
|
|
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 (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 & TUN_PERSIST)) {
|
|
tun->flags |= TUN_PERSIST;
|
|
__module_get(THIS_MODULE);
|
|
}
|
|
if (!arg && (tun->flags & TUN_PERSIST)) {
|
|
tun->flags &= ~TUN_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) != TUN_TAP_DEV)
|
|
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 TUNATTACHFILTER:
|
|
/* Can be set only for TAPs */
|
|
ret = -EINVAL;
|
|
if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
|
|
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) != TUN_TAP_DEV)
|
|
break;
|
|
ret = 0;
|
|
tun_detach_filter(tun, tun->numqueues);
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
unlock:
|
|
rtnl_unlock();
|
|
if (tun)
|
|
tun_put(tun);
|
|
return ret;
|
|
}
|
|
|
|
static long tun_chr_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq));
|
|
}
|
|
|
|
#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));
|
|
}
|
|
#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) {
|
|
ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
|
|
if (ret)
|
|
goto out;
|
|
tfile->flags |= TUN_FASYNC;
|
|
} else
|
|
tfile->flags &= ~TUN_FASYNC;
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int tun_chr_open(struct inode *inode, struct file * file)
|
|
{
|
|
struct tun_file *tfile;
|
|
|
|
DBG1(KERN_INFO, "tunX: tun_chr_open\n");
|
|
|
|
tfile = (struct tun_file *)sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL,
|
|
&tun_proto);
|
|
if (!tfile)
|
|
return -ENOMEM;
|
|
rcu_assign_pointer(tfile->tun, NULL);
|
|
tfile->net = get_net(current->nsproxy->net_ns);
|
|
tfile->flags = 0;
|
|
|
|
rcu_assign_pointer(tfile->socket.wq, &tfile->wq);
|
|
init_waitqueue_head(&tfile->wq.wait);
|
|
|
|
tfile->socket.file = file;
|
|
tfile->socket.ops = &tun_socket_ops;
|
|
|
|
sock_init_data(&tfile->socket, &tfile->sk);
|
|
sk_change_net(&tfile->sk, tfile->net);
|
|
|
|
tfile->sk.sk_write_space = tun_sock_write_space;
|
|
tfile->sk.sk_sndbuf = INT_MAX;
|
|
|
|
file->private_data = tfile;
|
|
set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags);
|
|
INIT_LIST_HEAD(&tfile->next);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tun_chr_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct tun_file *tfile = file->private_data;
|
|
struct net *net = tfile->net;
|
|
|
|
tun_detach(tfile, true);
|
|
put_net(net);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations tun_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.read = do_sync_read,
|
|
.aio_read = tun_chr_aio_read,
|
|
.write = do_sync_write,
|
|
.aio_write = tun_chr_aio_write,
|
|
.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
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
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 TUN_TUN_DEV:
|
|
strlcpy(info->bus_info, "tun", sizeof(info->bus_info));
|
|
break;
|
|
case TUN_TAP_DEV:
|
|
strlcpy(info->bus_info, "tap", sizeof(info->bus_info));
|
|
break;
|
|
}
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
|
|
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;
|
|
}
|
|
return 0;
|
|
err_misc:
|
|
rtnl_link_unregister(&tun_link_ops);
|
|
err_linkops:
|
|
return ret;
|
|
}
|
|
|
|
static void tun_cleanup(void)
|
|
{
|
|
misc_deregister(&tun_miscdev);
|
|
rtnl_link_unregister(&tun_link_ops);
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
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");
|