Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * TUN - Universal TUN/TAP device driver. |
| 3 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * Changes: |
| 20 | * |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
| 22 | * Add TUNSETLINK ioctl to set the link encapsulation |
| 23 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
Joe Perches | 344dc8e | 2012-07-12 19:33:09 +0000 | [diff] [blame] | 25 | * Use eth_random_addr() for tap MAC address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | * |
| 27 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 |
| 28 | * Fixes in packet dropping, queue length setting and queue wakeup. |
| 29 | * Increased default tx queue length. |
| 30 | * Added ethtool API. |
| 31 | * Minor cleanups |
| 32 | * |
| 33 | * Daniel Podlejski <underley@underley.eu.org> |
| 34 | * Modifications for 2.3.99-pre5 kernel. |
| 35 | */ |
| 36 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 37 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #define DRV_NAME "tun" |
| 40 | #define DRV_VERSION "1.6" |
| 41 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" |
| 42 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/module.h> |
| 45 | #include <linux/errno.h> |
| 46 | #include <linux/kernel.h> |
| 47 | #include <linux/major.h> |
| 48 | #include <linux/slab.h> |
| 49 | #include <linux/poll.h> |
| 50 | #include <linux/fcntl.h> |
| 51 | #include <linux/init.h> |
| 52 | #include <linux/skbuff.h> |
| 53 | #include <linux/netdevice.h> |
| 54 | #include <linux/etherdevice.h> |
| 55 | #include <linux/miscdevice.h> |
| 56 | #include <linux/ethtool.h> |
| 57 | #include <linux/rtnetlink.h> |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 58 | #include <linux/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #include <linux/if.h> |
| 60 | #include <linux/if_arp.h> |
| 61 | #include <linux/if_ether.h> |
| 62 | #include <linux/if_tun.h> |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 63 | #include <linux/if_vlan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #include <linux/crc32.h> |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 65 | #include <linux/nsproxy.h> |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 66 | #include <linux/virtio_net.h> |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 67 | #include <linux/rcupdate.h> |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 68 | #include <net/net_namespace.h> |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 69 | #include <net/netns/generic.h> |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 70 | #include <net/rtnetlink.h> |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 71 | #include <net/sock.h> |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 72 | #include <linux/seq_file.h> |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 73 | #include <linux/uio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #include <asm/uaccess.h> |
| 76 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 77 | /* Uncomment to enable debugging */ |
| 78 | /* #define TUN_DEBUG 1 */ |
| 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | #ifdef TUN_DEBUG |
| 81 | static int debug; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 82 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 83 | #define tun_debug(level, tun, fmt, args...) \ |
| 84 | do { \ |
| 85 | if (tun->debug) \ |
| 86 | netdev_printk(level, tun->dev, fmt, ##args); \ |
| 87 | } while (0) |
| 88 | #define DBG1(level, fmt, args...) \ |
| 89 | do { \ |
| 90 | if (debug == 2) \ |
| 91 | printk(level fmt, ##args); \ |
| 92 | } while (0) |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 93 | #else |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 94 | #define tun_debug(level, tun, fmt, args...) \ |
| 95 | do { \ |
| 96 | if (0) \ |
| 97 | netdev_printk(level, tun->dev, fmt, ##args); \ |
| 98 | } while (0) |
| 99 | #define DBG1(level, fmt, args...) \ |
| 100 | do { \ |
| 101 | if (0) \ |
| 102 | printk(level fmt, ##args); \ |
| 103 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | #endif |
| 105 | |
Michael S. Tsirkin | 031f5e0 | 2014-11-19 14:44:40 +0200 | [diff] [blame] | 106 | /* TUN device flags */ |
| 107 | |
| 108 | /* IFF_ATTACH_QUEUE is never stored in device flags, |
| 109 | * overload it to mean fasync when stored there. |
| 110 | */ |
| 111 | #define TUN_FASYNC IFF_ATTACH_QUEUE |
Michael S. Tsirkin | 1cf8e41 | 2014-12-16 15:05:06 +0200 | [diff] [blame] | 112 | /* High bits in flags field are unused. */ |
| 113 | #define TUN_VNET_LE 0x80000000 |
Greg Kurz | 8b8e658 | 2015-04-24 14:50:36 +0200 | [diff] [blame] | 114 | #define TUN_VNET_BE 0x40000000 |
Michael S. Tsirkin | 031f5e0 | 2014-11-19 14:44:40 +0200 | [diff] [blame] | 115 | |
| 116 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ |
Michael S. Tsirkin | 1cf8e41 | 2014-12-16 15:05:06 +0200 | [diff] [blame] | 117 | IFF_MULTI_QUEUE) |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 118 | #define GOODCOPY_LEN 128 |
| 119 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 120 | #define FLT_EXACT_COUNT 8 |
| 121 | struct tap_filter { |
| 122 | unsigned int count; /* Number of addrs. Zero means disabled */ |
| 123 | u32 mask[2]; /* Mask of the hashed addrs */ |
| 124 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; |
| 125 | }; |
| 126 | |
Pankaj Gupta | baf71c5 | 2015-01-12 11:41:29 +0530 | [diff] [blame] | 127 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
| 128 | * to max number of VCPUs in guest. */ |
| 129 | #define MAX_TAP_QUEUES 256 |
Jason Wang | b8732fb | 2013-01-23 03:59:13 +0000 | [diff] [blame] | 130 | #define MAX_TAP_FLOWS 4096 |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 131 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 132 | #define TUN_FLOW_EXPIRE (3 * HZ) |
| 133 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 134 | /* A tun_file connects an open character device to a tuntap netdevice. It |
stephen hemminger | 92d4ea6 | 2013-12-05 20:42:58 -0800 | [diff] [blame] | 135 | * also contains all socket related structures (except sock_fprog and tap_filter) |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 136 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
| 137 | * tap_filter were kept in tun_struct since they were used for filtering for the |
Rami Rosen | 36fe8c09 | 2012-11-25 22:07:40 +0000 | [diff] [blame] | 138 | * netdevice not for a specific queue (at least I didn't see the requirement for |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 139 | * this). |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 140 | * |
| 141 | * RCU usage: |
Rami Rosen | 36fe8c09 | 2012-11-25 22:07:40 +0000 | [diff] [blame] | 142 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 143 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 144 | */ |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 145 | struct tun_file { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 146 | struct sock sk; |
| 147 | struct socket socket; |
| 148 | struct socket_wq wq; |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 149 | struct tun_struct __rcu *tun; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 150 | struct fasync_struct *fasync; |
| 151 | /* only used for fasnyc */ |
| 152 | unsigned int flags; |
Pavel Emelyanov | fb7589a | 2013-08-21 14:31:38 +0400 | [diff] [blame] | 153 | union { |
| 154 | u16 queue_index; |
| 155 | unsigned int ifindex; |
| 156 | }; |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 157 | struct list_head next; |
| 158 | struct tun_struct *detached; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 159 | }; |
| 160 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 161 | struct tun_flow_entry { |
| 162 | struct hlist_node hash_link; |
| 163 | struct rcu_head rcu; |
| 164 | struct tun_struct *tun; |
| 165 | |
| 166 | u32 rxhash; |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 167 | u32 rps_rxhash; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 168 | int queue_index; |
| 169 | unsigned long updated; |
| 170 | }; |
| 171 | |
| 172 | #define TUN_NUM_FLOW_ENTRIES 1024 |
| 173 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 174 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
Rami Rosen | 36fe8c09 | 2012-11-25 22:07:40 +0000 | [diff] [blame] | 175 | * device, socket filter, sndbuf and vnet header size were restore when the |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 176 | * file were attached to a persist device. |
| 177 | */ |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 178 | struct tun_struct { |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 179 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
| 180 | unsigned int numqueues; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 181 | unsigned int flags; |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 182 | kuid_t owner; |
| 183 | kgid_t group; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 184 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 185 | struct net_device *dev; |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 186 | netdev_features_t set_features; |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 187 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
Vlad Yasevich | e3e3c42 | 2015-02-03 16:36:17 -0500 | [diff] [blame] | 188 | NETIF_F_TSO6|NETIF_F_UFO) |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 189 | |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 190 | int align; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 191 | int vnet_hdr_sz; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 192 | int sndbuf; |
| 193 | struct tap_filter txflt; |
| 194 | struct sock_fprog fprog; |
| 195 | /* protected by rtnl lock */ |
| 196 | bool filter_attached; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 197 | #ifdef TUN_DEBUG |
| 198 | int debug; |
| 199 | #endif |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 200 | spinlock_t lock; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 201 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
| 202 | struct timer_list flow_gc_timer; |
| 203 | unsigned long ageing_time; |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 204 | unsigned int numdisabled; |
| 205 | struct list_head disabled; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 206 | void *security; |
Jason Wang | b8732fb | 2013-01-23 03:59:13 +0000 | [diff] [blame] | 207 | u32 flow_count; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 208 | }; |
| 209 | |
Greg Kurz | 8b8e658 | 2015-04-24 14:50:36 +0200 | [diff] [blame] | 210 | #ifdef CONFIG_TUN_VNET_CROSS_LE |
| 211 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) |
| 212 | { |
| 213 | return tun->flags & TUN_VNET_BE ? false : |
| 214 | virtio_legacy_is_little_endian(); |
| 215 | } |
| 216 | |
| 217 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) |
| 218 | { |
| 219 | int be = !!(tun->flags & TUN_VNET_BE); |
| 220 | |
| 221 | if (put_user(be, argp)) |
| 222 | return -EFAULT; |
| 223 | |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) |
| 228 | { |
| 229 | int be; |
| 230 | |
| 231 | if (get_user(be, argp)) |
| 232 | return -EFAULT; |
| 233 | |
| 234 | if (be) |
| 235 | tun->flags |= TUN_VNET_BE; |
| 236 | else |
| 237 | tun->flags &= ~TUN_VNET_BE; |
| 238 | |
| 239 | return 0; |
| 240 | } |
| 241 | #else |
| 242 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) |
| 243 | { |
| 244 | return virtio_legacy_is_little_endian(); |
| 245 | } |
| 246 | |
| 247 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) |
| 248 | { |
| 249 | return -EINVAL; |
| 250 | } |
| 251 | |
| 252 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) |
| 253 | { |
| 254 | return -EINVAL; |
| 255 | } |
| 256 | #endif /* CONFIG_TUN_VNET_CROSS_LE */ |
| 257 | |
Greg Kurz | 25bd55bb | 2015-04-24 14:24:38 +0200 | [diff] [blame] | 258 | static inline bool tun_is_little_endian(struct tun_struct *tun) |
| 259 | { |
Greg Kurz | 7d82410 | 2015-04-24 14:26:24 +0200 | [diff] [blame] | 260 | return tun->flags & TUN_VNET_LE || |
Greg Kurz | 8b8e658 | 2015-04-24 14:50:36 +0200 | [diff] [blame] | 261 | tun_legacy_is_little_endian(tun); |
Greg Kurz | 25bd55bb | 2015-04-24 14:24:38 +0200 | [diff] [blame] | 262 | } |
| 263 | |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 264 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
| 265 | { |
Greg Kurz | 25bd55bb | 2015-04-24 14:24:38 +0200 | [diff] [blame] | 266 | return __virtio16_to_cpu(tun_is_little_endian(tun), val); |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) |
| 270 | { |
Greg Kurz | 25bd55bb | 2015-04-24 14:24:38 +0200 | [diff] [blame] | 271 | return __cpu_to_virtio16(tun_is_little_endian(tun), val); |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 272 | } |
| 273 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 274 | static inline u32 tun_hashfn(u32 rxhash) |
| 275 | { |
| 276 | return rxhash & 0x3ff; |
| 277 | } |
| 278 | |
| 279 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) |
| 280 | { |
| 281 | struct tun_flow_entry *e; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 282 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 283 | hlist_for_each_entry_rcu(e, head, hash_link) { |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 284 | if (e->rxhash == rxhash) |
| 285 | return e; |
| 286 | } |
| 287 | return NULL; |
| 288 | } |
| 289 | |
| 290 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, |
| 291 | struct hlist_head *head, |
| 292 | u32 rxhash, u16 queue_index) |
| 293 | { |
Eric Dumazet | 9fdc6be | 2012-12-21 07:17:21 +0000 | [diff] [blame] | 294 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
| 295 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 296 | if (e) { |
| 297 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", |
| 298 | rxhash, queue_index); |
| 299 | e->updated = jiffies; |
| 300 | e->rxhash = rxhash; |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 301 | e->rps_rxhash = 0; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 302 | e->queue_index = queue_index; |
| 303 | e->tun = tun; |
| 304 | hlist_add_head_rcu(&e->hash_link, head); |
Jason Wang | b8732fb | 2013-01-23 03:59:13 +0000 | [diff] [blame] | 305 | ++tun->flow_count; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 306 | } |
| 307 | return e; |
| 308 | } |
| 309 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 310 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
| 311 | { |
| 312 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", |
| 313 | e->rxhash, e->queue_index); |
| 314 | hlist_del_rcu(&e->hash_link); |
Eric Dumazet | 9fdc6be | 2012-12-21 07:17:21 +0000 | [diff] [blame] | 315 | kfree_rcu(e, rcu); |
Jason Wang | b8732fb | 2013-01-23 03:59:13 +0000 | [diff] [blame] | 316 | --tun->flow_count; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | static void tun_flow_flush(struct tun_struct *tun) |
| 320 | { |
| 321 | int i; |
| 322 | |
| 323 | spin_lock_bh(&tun->lock); |
| 324 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { |
| 325 | struct tun_flow_entry *e; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 326 | struct hlist_node *n; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 327 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 328 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 329 | tun_flow_delete(tun, e); |
| 330 | } |
| 331 | spin_unlock_bh(&tun->lock); |
| 332 | } |
| 333 | |
| 334 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) |
| 335 | { |
| 336 | int i; |
| 337 | |
| 338 | spin_lock_bh(&tun->lock); |
| 339 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { |
| 340 | struct tun_flow_entry *e; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 341 | struct hlist_node *n; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 342 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 343 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 344 | if (e->queue_index == queue_index) |
| 345 | tun_flow_delete(tun, e); |
| 346 | } |
| 347 | } |
| 348 | spin_unlock_bh(&tun->lock); |
| 349 | } |
| 350 | |
| 351 | static void tun_flow_cleanup(unsigned long data) |
| 352 | { |
| 353 | struct tun_struct *tun = (struct tun_struct *)data; |
| 354 | unsigned long delay = tun->ageing_time; |
| 355 | unsigned long next_timer = jiffies + delay; |
| 356 | unsigned long count = 0; |
| 357 | int i; |
| 358 | |
| 359 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); |
| 360 | |
| 361 | spin_lock_bh(&tun->lock); |
| 362 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { |
| 363 | struct tun_flow_entry *e; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 364 | struct hlist_node *n; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 365 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 366 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 367 | unsigned long this_timer; |
| 368 | count++; |
| 369 | this_timer = e->updated + delay; |
| 370 | if (time_before_eq(this_timer, jiffies)) |
| 371 | tun_flow_delete(tun, e); |
| 372 | else if (time_before(this_timer, next_timer)) |
| 373 | next_timer = this_timer; |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | if (count) |
| 378 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); |
| 379 | spin_unlock_bh(&tun->lock); |
| 380 | } |
| 381 | |
Eric Dumazet | 4997442 | 2012-12-12 19:22:57 +0000 | [diff] [blame] | 382 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 383 | struct tun_file *tfile) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 384 | { |
| 385 | struct hlist_head *head; |
| 386 | struct tun_flow_entry *e; |
| 387 | unsigned long delay = tun->ageing_time; |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 388 | u16 queue_index = tfile->queue_index; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 389 | |
| 390 | if (!rxhash) |
| 391 | return; |
| 392 | else |
| 393 | head = &tun->flows[tun_hashfn(rxhash)]; |
| 394 | |
| 395 | rcu_read_lock(); |
| 396 | |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 397 | /* We may get a very small possibility of OOO during switching, not |
| 398 | * worth to optimize.*/ |
| 399 | if (tun->numqueues == 1 || tfile->detached) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 400 | goto unlock; |
| 401 | |
| 402 | e = tun_flow_find(head, rxhash); |
| 403 | if (likely(e)) { |
| 404 | /* TODO: keep queueing to old queue until it's empty? */ |
| 405 | e->queue_index = queue_index; |
| 406 | e->updated = jiffies; |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 407 | sock_rps_record_flow_hash(e->rps_rxhash); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 408 | } else { |
| 409 | spin_lock_bh(&tun->lock); |
Jason Wang | b8732fb | 2013-01-23 03:59:13 +0000 | [diff] [blame] | 410 | if (!tun_flow_find(head, rxhash) && |
| 411 | tun->flow_count < MAX_TAP_FLOWS) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 412 | tun_flow_create(tun, head, rxhash, queue_index); |
| 413 | |
| 414 | if (!timer_pending(&tun->flow_gc_timer)) |
| 415 | mod_timer(&tun->flow_gc_timer, |
| 416 | round_jiffies_up(jiffies + delay)); |
| 417 | spin_unlock_bh(&tun->lock); |
| 418 | } |
| 419 | |
| 420 | unlock: |
| 421 | rcu_read_unlock(); |
| 422 | } |
| 423 | |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 424 | /** |
| 425 | * Save the hash received in the stack receive path and update the |
| 426 | * flow_hash table accordingly. |
| 427 | */ |
| 428 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) |
| 429 | { |
Eric Dumazet | 567e4b7 | 2015-02-06 12:59:01 -0800 | [diff] [blame] | 430 | if (unlikely(e->rps_rxhash != hash)) |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 431 | e->rps_rxhash = hash; |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 432 | } |
| 433 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 434 | /* We try to identify a flow through its rxhash first. The reason that |
stephen hemminger | 92d4ea6 | 2013-12-05 20:42:58 -0800 | [diff] [blame] | 435 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 436 | * the rxq based on the txq where the last packet of the flow comes. As |
| 437 | * the userspace application move between processors, we may get a |
| 438 | * different rxq no. here. If we could not get rxhash, then we would |
| 439 | * hope the rxq no. may help here. |
| 440 | */ |
Jason Wang | f663dd9 | 2014-01-10 16:18:26 +0800 | [diff] [blame] | 441 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, |
Daniel Borkmann | 99932d4 | 2014-02-16 15:55:20 +0100 | [diff] [blame] | 442 | void *accel_priv, select_queue_fallback_t fallback) |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 443 | { |
| 444 | struct tun_struct *tun = netdev_priv(dev); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 445 | struct tun_flow_entry *e; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 446 | u32 txq = 0; |
| 447 | u32 numqueues = 0; |
| 448 | |
| 449 | rcu_read_lock(); |
Jason Wang | 92bb73e | 2013-06-05 16:44:57 +0800 | [diff] [blame] | 450 | numqueues = ACCESS_ONCE(tun->numqueues); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 451 | |
Tom Herbert | 3958afa1b | 2013-12-15 22:12:06 -0800 | [diff] [blame] | 452 | txq = skb_get_hash(skb); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 453 | if (txq) { |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 454 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 455 | if (e) { |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 456 | tun_flow_save_rps_rxhash(e, txq); |
Zhi Yong Wu | fbe4d45 | 2014-01-02 13:24:28 +0800 | [diff] [blame] | 457 | txq = e->queue_index; |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 458 | } else |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 459 | /* use multiply and shift instead of expensive divide */ |
| 460 | txq = ((u64)txq * numqueues) >> 32; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 461 | } else if (likely(skb_rx_queue_recorded(skb))) { |
| 462 | txq = skb_get_rx_queue(skb); |
| 463 | while (unlikely(txq >= numqueues)) |
| 464 | txq -= numqueues; |
| 465 | } |
| 466 | |
| 467 | rcu_read_unlock(); |
| 468 | return txq; |
| 469 | } |
| 470 | |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 471 | static inline bool tun_not_capable(struct tun_struct *tun) |
| 472 | { |
| 473 | const struct cred *cred = current_cred(); |
Eric W. Biederman | c260b77 | 2012-11-18 21:34:11 +0000 | [diff] [blame] | 474 | struct net *net = dev_net(tun->dev); |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 475 | |
| 476 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || |
| 477 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && |
Eric W. Biederman | c260b77 | 2012-11-18 21:34:11 +0000 | [diff] [blame] | 478 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 479 | } |
| 480 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 481 | static void tun_set_real_num_queues(struct tun_struct *tun) |
| 482 | { |
| 483 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); |
| 484 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); |
| 485 | } |
| 486 | |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 487 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
| 488 | { |
| 489 | tfile->detached = tun; |
| 490 | list_add_tail(&tfile->next, &tun->disabled); |
| 491 | ++tun->numdisabled; |
| 492 | } |
| 493 | |
Jason Wang | d32649d | 2012-12-18 11:00:27 +0800 | [diff] [blame] | 494 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 495 | { |
| 496 | struct tun_struct *tun = tfile->detached; |
| 497 | |
| 498 | tfile->detached = NULL; |
| 499 | list_del_init(&tfile->next); |
| 500 | --tun->numdisabled; |
| 501 | return tun; |
| 502 | } |
| 503 | |
Jason Wang | 4bfb051 | 2013-09-05 17:53:59 +0800 | [diff] [blame] | 504 | static void tun_queue_purge(struct tun_file *tfile) |
| 505 | { |
| 506 | skb_queue_purge(&tfile->sk.sk_receive_queue); |
| 507 | skb_queue_purge(&tfile->sk.sk_error_queue); |
| 508 | } |
| 509 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 510 | static void __tun_detach(struct tun_file *tfile, bool clean) |
| 511 | { |
| 512 | struct tun_file *ntfile; |
| 513 | struct tun_struct *tun; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 514 | |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 515 | tun = rtnl_dereference(tfile->tun); |
| 516 | |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 517 | if (tun && !tfile->detached) { |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 518 | u16 index = tfile->queue_index; |
| 519 | BUG_ON(index >= tun->numqueues); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 520 | |
| 521 | rcu_assign_pointer(tun->tfiles[index], |
| 522 | tun->tfiles[tun->numqueues - 1]); |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 523 | ntfile = rtnl_dereference(tun->tfiles[index]); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 524 | ntfile->queue_index = index; |
| 525 | |
| 526 | --tun->numqueues; |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 527 | if (clean) { |
Monam Agarwal | c956674 | 2014-03-24 00:02:32 +0530 | [diff] [blame] | 528 | RCU_INIT_POINTER(tfile->tun, NULL); |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 529 | sock_put(&tfile->sk); |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 530 | } else |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 531 | tun_disable_queue(tun, tfile); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 532 | |
| 533 | synchronize_net(); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 534 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 535 | /* Drop read queue */ |
Jason Wang | 4bfb051 | 2013-09-05 17:53:59 +0800 | [diff] [blame] | 536 | tun_queue_purge(tfile); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 537 | tun_set_real_num_queues(tun); |
Jason Wang | dd38bd8 | 2013-01-11 16:59:34 +0000 | [diff] [blame] | 538 | } else if (tfile->detached && clean) { |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 539 | tun = tun_enable_queue(tfile); |
Jason Wang | dd38bd8 | 2013-01-11 16:59:34 +0000 | [diff] [blame] | 540 | sock_put(&tfile->sk); |
| 541 | } |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 542 | |
| 543 | if (clean) { |
Michael S. Tsirkin | af668b3 | 2013-01-28 00:38:02 +0000 | [diff] [blame] | 544 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
| 545 | netif_carrier_off(tun->dev); |
| 546 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 547 | if (!(tun->flags & IFF_PERSIST) && |
Michael S. Tsirkin | af668b3 | 2013-01-28 00:38:02 +0000 | [diff] [blame] | 548 | tun->dev->reg_state == NETREG_REGISTERED) |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 549 | unregister_netdevice(tun->dev); |
Michael S. Tsirkin | af668b3 | 2013-01-28 00:38:02 +0000 | [diff] [blame] | 550 | } |
Eric W. Biederman | 140e807da | 2015-05-08 21:07:08 -0500 | [diff] [blame] | 551 | sock_put(&tfile->sk); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 552 | } |
| 553 | } |
| 554 | |
| 555 | static void tun_detach(struct tun_file *tfile, bool clean) |
| 556 | { |
| 557 | rtnl_lock(); |
| 558 | __tun_detach(tfile, clean); |
| 559 | rtnl_unlock(); |
| 560 | } |
| 561 | |
| 562 | static void tun_detach_all(struct net_device *dev) |
| 563 | { |
| 564 | struct tun_struct *tun = netdev_priv(dev); |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 565 | struct tun_file *tfile, *tmp; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 566 | int i, n = tun->numqueues; |
| 567 | |
| 568 | for (i = 0; i < n; i++) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 569 | tfile = rtnl_dereference(tun->tfiles[i]); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 570 | BUG_ON(!tfile); |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 571 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
Monam Agarwal | c956674 | 2014-03-24 00:02:32 +0530 | [diff] [blame] | 572 | RCU_INIT_POINTER(tfile->tun, NULL); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 573 | --tun->numqueues; |
| 574 | } |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 575 | list_for_each_entry(tfile, &tun->disabled, next) { |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 576 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
Monam Agarwal | c956674 | 2014-03-24 00:02:32 +0530 | [diff] [blame] | 577 | RCU_INIT_POINTER(tfile->tun, NULL); |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 578 | } |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 579 | BUG_ON(tun->numqueues != 0); |
| 580 | |
| 581 | synchronize_net(); |
| 582 | for (i = 0; i < n; i++) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 583 | tfile = rtnl_dereference(tun->tfiles[i]); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 584 | /* Drop read queue */ |
Jason Wang | 4bfb051 | 2013-09-05 17:53:59 +0800 | [diff] [blame] | 585 | tun_queue_purge(tfile); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 586 | sock_put(&tfile->sk); |
| 587 | } |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 588 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
| 589 | tun_enable_queue(tfile); |
Jason Wang | 4bfb051 | 2013-09-05 17:53:59 +0800 | [diff] [blame] | 590 | tun_queue_purge(tfile); |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 591 | sock_put(&tfile->sk); |
| 592 | } |
| 593 | BUG_ON(tun->numdisabled != 0); |
Jason Wang | dd38bd8 | 2013-01-11 16:59:34 +0000 | [diff] [blame] | 594 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 595 | if (tun->flags & IFF_PERSIST) |
Jason Wang | dd38bd8 | 2013-01-11 16:59:34 +0000 | [diff] [blame] | 596 | module_put(THIS_MODULE); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 597 | } |
| 598 | |
Pavel Emelyanov | 849c9b6 | 2013-08-21 14:32:21 +0400 | [diff] [blame] | 599 | static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 600 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 601 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 602 | int err; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 603 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 604 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
| 605 | if (err < 0) |
| 606 | goto out; |
| 607 | |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 608 | err = -EINVAL; |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 609 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 610 | goto out; |
| 611 | |
| 612 | err = -EBUSY; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 613 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 614 | goto out; |
| 615 | |
| 616 | err = -E2BIG; |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 617 | if (!tfile->detached && |
| 618 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 619 | goto out; |
| 620 | |
| 621 | err = 0; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 622 | |
stephen hemminger | 92d4ea6 | 2013-12-05 20:42:58 -0800 | [diff] [blame] | 623 | /* Re-attach the filter to persist device */ |
Pavel Emelyanov | 849c9b6 | 2013-08-21 14:32:21 +0400 | [diff] [blame] | 624 | if (!skip_filter && (tun->filter_attached == true)) { |
Hannes Frederic Sowa | 8ced425 | 2016-04-05 17:10:16 +0200 | [diff] [blame] | 625 | lock_sock(tfile->socket.sk); |
| 626 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
| 627 | release_sock(tfile->socket.sk); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 628 | if (!err) |
| 629 | goto out; |
| 630 | } |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 631 | tfile->queue_index = tun->numqueues; |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 632 | rcu_assign_pointer(tfile->tun, tun); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 633 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 634 | tun->numqueues++; |
| 635 | |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 636 | if (tfile->detached) |
| 637 | tun_enable_queue(tfile); |
| 638 | else |
| 639 | sock_hold(&tfile->sk); |
| 640 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 641 | tun_set_real_num_queues(tun); |
| 642 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 643 | /* device is allowed to go away first, so no need to hold extra |
| 644 | * refcnt. |
| 645 | */ |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 646 | |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 647 | out: |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 648 | return err; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 649 | } |
| 650 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 651 | static struct tun_struct *__tun_get(struct tun_file *tfile) |
| 652 | { |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 653 | struct tun_struct *tun; |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 654 | |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 655 | rcu_read_lock(); |
| 656 | tun = rcu_dereference(tfile->tun); |
| 657 | if (tun) |
| 658 | dev_hold(tun->dev); |
| 659 | rcu_read_unlock(); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 660 | |
| 661 | return tun; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 662 | } |
| 663 | |
| 664 | static struct tun_struct *tun_get(struct file *file) |
| 665 | { |
| 666 | return __tun_get(file->private_data); |
| 667 | } |
| 668 | |
| 669 | static void tun_put(struct tun_struct *tun) |
| 670 | { |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 671 | dev_put(tun->dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 672 | } |
| 673 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 674 | /* TAP filtering */ |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 675 | static void addr_hash_set(u32 *mask, const u8 *addr) |
| 676 | { |
| 677 | int n = ether_crc(ETH_ALEN, addr) >> 26; |
| 678 | mask[n >> 5] |= (1 << (n & 31)); |
| 679 | } |
| 680 | |
| 681 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) |
| 682 | { |
| 683 | int n = ether_crc(ETH_ALEN, addr) >> 26; |
| 684 | return mask[n >> 5] & (1 << (n & 31)); |
| 685 | } |
| 686 | |
| 687 | static int update_filter(struct tap_filter *filter, void __user *arg) |
| 688 | { |
| 689 | struct { u8 u[ETH_ALEN]; } *addr; |
| 690 | struct tun_filter uf; |
| 691 | int err, alen, n, nexact; |
| 692 | |
| 693 | if (copy_from_user(&uf, arg, sizeof(uf))) |
| 694 | return -EFAULT; |
| 695 | |
| 696 | if (!uf.count) { |
| 697 | /* Disabled */ |
| 698 | filter->count = 0; |
| 699 | return 0; |
| 700 | } |
| 701 | |
| 702 | alen = ETH_ALEN * uf.count; |
| 703 | addr = kmalloc(alen, GFP_KERNEL); |
| 704 | if (!addr) |
| 705 | return -ENOMEM; |
| 706 | |
| 707 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { |
| 708 | err = -EFAULT; |
| 709 | goto done; |
| 710 | } |
| 711 | |
| 712 | /* The filter is updated without holding any locks. Which is |
| 713 | * perfectly safe. We disable it first and in the worst |
| 714 | * case we'll accept a few undesired packets. */ |
| 715 | filter->count = 0; |
| 716 | wmb(); |
| 717 | |
| 718 | /* Use first set of addresses as an exact filter */ |
| 719 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) |
| 720 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); |
| 721 | |
| 722 | nexact = n; |
| 723 | |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 724 | /* Remaining multicast addresses are hashed, |
| 725 | * unicast will leave the filter disabled. */ |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 726 | memset(filter->mask, 0, sizeof(filter->mask)); |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 727 | for (; n < uf.count; n++) { |
| 728 | if (!is_multicast_ether_addr(addr[n].u)) { |
| 729 | err = 0; /* no filter */ |
| 730 | goto done; |
| 731 | } |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 732 | addr_hash_set(filter->mask, addr[n].u); |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 733 | } |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 734 | |
| 735 | /* For ALLMULTI just set the mask to all ones. |
| 736 | * This overrides the mask populated above. */ |
| 737 | if ((uf.flags & TUN_FLT_ALLMULTI)) |
| 738 | memset(filter->mask, ~0, sizeof(filter->mask)); |
| 739 | |
| 740 | /* Now enable the filter */ |
| 741 | wmb(); |
| 742 | filter->count = nexact; |
| 743 | |
| 744 | /* Return the number of exact filters */ |
| 745 | err = nexact; |
| 746 | |
| 747 | done: |
| 748 | kfree(addr); |
| 749 | return err; |
| 750 | } |
| 751 | |
| 752 | /* Returns: 0 - drop, !=0 - accept */ |
| 753 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) |
| 754 | { |
| 755 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect |
| 756 | * at this point. */ |
| 757 | struct ethhdr *eh = (struct ethhdr *) skb->data; |
| 758 | int i; |
| 759 | |
| 760 | /* Exact match */ |
| 761 | for (i = 0; i < filter->count; i++) |
Joe Perches | 2e42e47 | 2012-05-09 17:17:46 +0000 | [diff] [blame] | 762 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 763 | return 1; |
| 764 | |
| 765 | /* Inexact match (multicast only) */ |
| 766 | if (is_multicast_ether_addr(eh->h_dest)) |
| 767 | return addr_hash_test(filter->mask, eh->h_dest); |
| 768 | |
| 769 | return 0; |
| 770 | } |
| 771 | |
| 772 | /* |
| 773 | * Checks whether the packet is accepted or not. |
| 774 | * Returns: 0 - drop, !=0 - accept |
| 775 | */ |
| 776 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) |
| 777 | { |
| 778 | if (!filter->count) |
| 779 | return 1; |
| 780 | |
| 781 | return run_filter(filter, skb); |
| 782 | } |
| 783 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | /* Network device part of the driver */ |
| 785 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 786 | static const struct ethtool_ops tun_ethtool_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 788 | /* Net device detach from fd. */ |
| 789 | static void tun_net_uninit(struct net_device *dev) |
| 790 | { |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 791 | tun_detach_all(dev); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 792 | } |
| 793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | /* Net device open. */ |
| 795 | static int tun_net_open(struct net_device *dev) |
| 796 | { |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 797 | netif_tx_start_all_queues(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | return 0; |
| 799 | } |
| 800 | |
| 801 | /* Net device close. */ |
| 802 | static int tun_net_close(struct net_device *dev) |
| 803 | { |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 804 | netif_tx_stop_all_queues(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | return 0; |
| 806 | } |
| 807 | |
| 808 | /* Net device start xmit */ |
Stephen Hemminger | 424efe9 | 2009-08-31 19:50:51 +0000 | [diff] [blame] | 809 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | { |
| 811 | struct tun_struct *tun = netdev_priv(dev); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 812 | int txq = skb->queue_mapping; |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 813 | struct tun_file *tfile; |
Dominic Curran | fa35864 | 2014-01-22 03:03:23 +0000 | [diff] [blame] | 814 | u32 numqueues = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 816 | rcu_read_lock(); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 817 | tfile = rcu_dereference(tun->tfiles[txq]); |
Dominic Curran | fa35864 | 2014-01-22 03:03:23 +0000 | [diff] [blame] | 818 | numqueues = ACCESS_ONCE(tun->numqueues); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 819 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | /* Drop packet if interface is not attached */ |
Dominic Curran | fa35864 | 2014-01-22 03:03:23 +0000 | [diff] [blame] | 821 | if (txq >= numqueues) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | goto drop; |
| 823 | |
Dominic Curran | fa35864 | 2014-01-22 03:03:23 +0000 | [diff] [blame] | 824 | if (numqueues == 1) { |
Tom Herbert | 9bc8893 | 2013-12-22 18:54:32 +0800 | [diff] [blame] | 825 | /* Select queue was not called for the skbuff, so we extract the |
| 826 | * RPS hash and save it into the flow_table here. |
| 827 | */ |
| 828 | __u32 rxhash; |
| 829 | |
| 830 | rxhash = skb_get_hash(skb); |
| 831 | if (rxhash) { |
| 832 | struct tun_flow_entry *e; |
| 833 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], |
| 834 | rxhash); |
| 835 | if (e) |
| 836 | tun_flow_save_rps_rxhash(e, rxhash); |
| 837 | } |
| 838 | } |
| 839 | |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 840 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
| 841 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 842 | BUG_ON(!tfile); |
| 843 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 844 | /* Drop if the filter does not like it. |
| 845 | * This is a noop if the filter is disabled. |
| 846 | * Filter can be enabled only for the TAP devices. */ |
| 847 | if (!check_filter(&tun->txflt, skb)) |
| 848 | goto drop; |
| 849 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 850 | if (tfile->socket.sk->sk_filter && |
| 851 | sk_filter(tfile->socket.sk, skb)) |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 852 | goto drop; |
| 853 | |
Rami Rosen | 36fe8c09 | 2012-11-25 22:07:40 +0000 | [diff] [blame] | 854 | /* Limit the number of packets queued by dividing txq length with the |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 855 | * number of queues. |
| 856 | */ |
Dominic Curran | fa35864 | 2014-01-22 03:03:23 +0000 | [diff] [blame] | 857 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) * numqueues |
| 858 | >= dev->tx_queue_len) |
Michael S. Tsirkin | 5d09710 | 2012-12-03 10:07:14 +0000 | [diff] [blame] | 859 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
Jason Wang | 7bf6630 | 2013-09-05 17:54:00 +0800 | [diff] [blame] | 861 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
| 862 | goto drop; |
| 863 | |
Eric Dumazet | 5fcd2d8 | 2015-10-09 15:42:21 -0700 | [diff] [blame] | 864 | if (skb->sk && sk_fullsock(skb->sk)) { |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 865 | sock_tx_timestamp(skb->sk, skb->sk->sk_tsflags, |
| 866 | &skb_shinfo(skb)->tx_flags); |
Richard Cochran | eda2977 | 2013-07-19 19:40:10 +0200 | [diff] [blame] | 867 | sw_tx_timestamp(skb); |
| 868 | } |
| 869 | |
Michael S. Tsirkin | 0110d6f | 2010-04-13 04:59:44 +0000 | [diff] [blame] | 870 | /* Orphan the skb - required as we might hang on to it |
Jason Wang | 7bf6630 | 2013-09-05 17:54:00 +0800 | [diff] [blame] | 871 | * for indefinite time. |
| 872 | */ |
Michael S. Tsirkin | 0110d6f | 2010-04-13 04:59:44 +0000 | [diff] [blame] | 873 | skb_orphan(skb); |
| 874 | |
Eric Dumazet | f8af75f | 2013-03-06 11:02:37 +0000 | [diff] [blame] | 875 | nf_reset(skb); |
| 876 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 877 | /* Enqueue packet */ |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 878 | skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
| 880 | /* Notify and wake up reader process */ |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 881 | if (tfile->flags & TUN_FASYNC) |
| 882 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 883 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 884 | |
| 885 | rcu_read_unlock(); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 886 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
| 888 | drop: |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 889 | dev->stats.tx_dropped++; |
Michael S. Tsirkin | 149d36f | 2012-11-01 09:16:32 +0000 | [diff] [blame] | 890 | skb_tx_error(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | kfree_skb(skb); |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 892 | rcu_read_unlock(); |
Jason Wang | baeabab | 2014-11-18 13:20:41 +0800 | [diff] [blame] | 893 | return NET_XMIT_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | } |
| 895 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 896 | static void tun_net_mclist(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | { |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 898 | /* |
| 899 | * This callback is supposed to deal with mc filter in |
| 900 | * _rx_ path and has nothing to do with the _tx_ path. |
| 901 | * In rx path we always accept everything userspace gives us. |
| 902 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | } |
| 904 | |
Ed Swierk | 4885a50 | 2007-09-16 12:21:38 -0700 | [diff] [blame] | 905 | #define MIN_MTU 68 |
| 906 | #define MAX_MTU 65535 |
| 907 | |
| 908 | static int |
| 909 | tun_net_change_mtu(struct net_device *dev, int new_mtu) |
| 910 | { |
| 911 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) |
| 912 | return -EINVAL; |
| 913 | dev->mtu = new_mtu; |
| 914 | return 0; |
| 915 | } |
| 916 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 917 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
| 918 | netdev_features_t features) |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 919 | { |
| 920 | struct tun_struct *tun = netdev_priv(dev); |
| 921 | |
| 922 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); |
| 923 | } |
Neil Horman | bebd097 | 2011-06-15 05:25:01 +0000 | [diff] [blame] | 924 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 925 | static void tun_poll_controller(struct net_device *dev) |
| 926 | { |
| 927 | /* |
| 928 | * Tun only receives frames when: |
| 929 | * 1) the char device endpoint gets data from user space |
| 930 | * 2) the tun socket gets a sendmsg call from user space |
stephen hemminger | 92d4ea6 | 2013-12-05 20:42:58 -0800 | [diff] [blame] | 931 | * Since both of those are synchronous operations, we are guaranteed |
Neil Horman | bebd097 | 2011-06-15 05:25:01 +0000 | [diff] [blame] | 932 | * never to have pending data when we poll for it |
stephen hemminger | 92d4ea6 | 2013-12-05 20:42:58 -0800 | [diff] [blame] | 933 | * so there is nothing to do here but return. |
Neil Horman | bebd097 | 2011-06-15 05:25:01 +0000 | [diff] [blame] | 934 | * We need this though so netpoll recognizes us as an interface that |
| 935 | * supports polling, which enables bridge devices in virt setups to |
| 936 | * still use netconsole |
| 937 | */ |
| 938 | return; |
| 939 | } |
| 940 | #endif |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 941 | |
| 942 | static void tun_set_headroom(struct net_device *dev, int new_hr) |
| 943 | { |
| 944 | struct tun_struct *tun = netdev_priv(dev); |
| 945 | |
| 946 | if (new_hr < NET_SKB_PAD) |
| 947 | new_hr = NET_SKB_PAD; |
| 948 | |
| 949 | tun->align = new_hr; |
| 950 | } |
| 951 | |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 952 | static const struct net_device_ops tun_netdev_ops = { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 953 | .ndo_uninit = tun_net_uninit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 954 | .ndo_open = tun_net_open, |
| 955 | .ndo_stop = tun_net_close, |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 956 | .ndo_start_xmit = tun_net_xmit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 957 | .ndo_change_mtu = tun_net_change_mtu, |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 958 | .ndo_fix_features = tun_net_fix_features, |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 959 | .ndo_select_queue = tun_select_queue, |
Neil Horman | bebd097 | 2011-06-15 05:25:01 +0000 | [diff] [blame] | 960 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 961 | .ndo_poll_controller = tun_poll_controller, |
| 962 | #endif |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 963 | .ndo_set_rx_headroom = tun_set_headroom, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 964 | }; |
| 965 | |
| 966 | static const struct net_device_ops tap_netdev_ops = { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 967 | .ndo_uninit = tun_net_uninit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 968 | .ndo_open = tun_net_open, |
| 969 | .ndo_stop = tun_net_close, |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 970 | .ndo_start_xmit = tun_net_xmit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 971 | .ndo_change_mtu = tun_net_change_mtu, |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 972 | .ndo_fix_features = tun_net_fix_features, |
Jiri Pirko | afc4b13 | 2011-08-16 06:29:01 +0000 | [diff] [blame] | 973 | .ndo_set_rx_mode = tun_net_mclist, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 974 | .ndo_set_mac_address = eth_mac_addr, |
| 975 | .ndo_validate_addr = eth_validate_addr, |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 976 | .ndo_select_queue = tun_select_queue, |
Neil Horman | bebd097 | 2011-06-15 05:25:01 +0000 | [diff] [blame] | 977 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 978 | .ndo_poll_controller = tun_poll_controller, |
| 979 | #endif |
Toshiaki Makita | 5e52796 | 2015-07-31 15:03:27 +0900 | [diff] [blame] | 980 | .ndo_features_check = passthru_features_check, |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 981 | .ndo_set_rx_headroom = tun_set_headroom, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 982 | }; |
| 983 | |
Pavel Emelyanov | 944a137 | 2013-06-11 17:01:08 +0400 | [diff] [blame] | 984 | static void tun_flow_init(struct tun_struct *tun) |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 985 | { |
| 986 | int i; |
| 987 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 988 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
| 989 | INIT_HLIST_HEAD(&tun->flows[i]); |
| 990 | |
| 991 | tun->ageing_time = TUN_FLOW_EXPIRE; |
| 992 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); |
| 993 | mod_timer(&tun->flow_gc_timer, |
| 994 | round_jiffies_up(jiffies + tun->ageing_time)); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 995 | } |
| 996 | |
| 997 | static void tun_flow_uninit(struct tun_struct *tun) |
| 998 | { |
| 999 | del_timer_sync(&tun->flow_gc_timer); |
| 1000 | tun_flow_flush(tun); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1001 | } |
| 1002 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | /* Initialize net device. */ |
| 1004 | static void tun_net_init(struct net_device *dev) |
| 1005 | { |
| 1006 | struct tun_struct *tun = netdev_priv(dev); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1007 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | switch (tun->flags & TUN_TYPE_MASK) { |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1009 | case IFF_TUN: |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1010 | dev->netdev_ops = &tun_netdev_ops; |
| 1011 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | /* Point-to-Point TUN Device */ |
| 1013 | dev->hard_header_len = 0; |
| 1014 | dev->addr_len = 0; |
| 1015 | dev->mtu = 1500; |
| 1016 | |
| 1017 | /* Zero header length */ |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1018 | dev->type = ARPHRD_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | break; |
| 1021 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1022 | case IFF_TAP: |
Kusanagi Kouichi | 7a0a960 | 2008-12-29 18:23:28 -0800 | [diff] [blame] | 1023 | dev->netdev_ops = &tap_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | /* Ethernet TAP Device */ |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1025 | ether_setup(dev); |
Neil Horman | 550fd08 | 2011-07-26 06:05:38 +0000 | [diff] [blame] | 1026 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
stephen hemminger | a676847 | 2012-12-10 15:16:00 +0000 | [diff] [blame] | 1027 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
Danny Kukawka | f2cedb6 | 2012-02-15 06:45:39 +0000 | [diff] [blame] | 1029 | eth_hw_addr_random(dev); |
Brian Braunstein | 36226a8 | 2007-04-26 01:00:55 -0700 | [diff] [blame] | 1030 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | break; |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | /* Character device part */ |
| 1036 | |
| 1037 | /* Poll */ |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1038 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1039 | { |
Eric W. Biederman | b2430de | 2009-01-20 11:03:21 +0000 | [diff] [blame] | 1040 | struct tun_file *tfile = file->private_data; |
| 1041 | struct tun_struct *tun = __tun_get(tfile); |
Mariusz Kozlowski | 3c8a9c6 | 2009-07-05 19:48:35 +0000 | [diff] [blame] | 1042 | struct sock *sk; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1043 | unsigned int mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | |
| 1045 | if (!tun) |
Eric W. Biederman | eac9e90 | 2009-01-20 10:59:05 +0000 | [diff] [blame] | 1046 | return POLLERR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1048 | sk = tfile->socket.sk; |
Mariusz Kozlowski | 3c8a9c6 | 2009-07-05 19:48:35 +0000 | [diff] [blame] | 1049 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1050 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 1052 | poll_wait(file, sk_sleep(sk), wait); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1053 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 1054 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | mask |= POLLIN | POLLRDNORM; |
| 1056 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1057 | if (sock_writeable(sk) || |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 1058 | (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) && |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1059 | sock_writeable(sk))) |
| 1060 | mask |= POLLOUT | POLLWRNORM; |
| 1061 | |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 1062 | if (tun->dev->reg_state != NETREG_REGISTERED) |
| 1063 | mask = POLLERR; |
| 1064 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1065 | tun_put(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | return mask; |
| 1067 | } |
| 1068 | |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1069 | /* prepad is the amount to reserve at front. len is length after that. |
| 1070 | * linear is a hint as to how much to copy (usually headers). */ |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1071 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
stephen hemminger | 6f7c156 | 2011-06-08 14:33:08 +0000 | [diff] [blame] | 1072 | size_t prepad, size_t len, |
| 1073 | size_t linear, int noblock) |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1074 | { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1075 | struct sock *sk = tfile->socket.sk; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1076 | struct sk_buff *skb; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1077 | int err; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1078 | |
| 1079 | /* Under a page? Don't bother with paged skb. */ |
Herbert Xu | 0eca93b | 2009-04-14 02:09:43 -0700 | [diff] [blame] | 1080 | if (prepad + len < PAGE_SIZE || !linear) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1081 | linear = len; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1082 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1083 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 1084 | &err, 0); |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1085 | if (!skb) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1086 | return ERR_PTR(err); |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1087 | |
| 1088 | skb_reserve(skb, prepad); |
| 1089 | skb_put(skb, linear); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1090 | skb->data_len = len - linear; |
| 1091 | skb->len += len - linear; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 1092 | |
| 1093 | return skb; |
| 1094 | } |
| 1095 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | /* Get packet from user space buffer */ |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1097 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1098 | void *msg_control, struct iov_iter *from, |
| 1099 | int noblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | { |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1101 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | struct sk_buff *skb; |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1103 | size_t total_len = iov_iter_count(from); |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 1104 | size_t len = total_len, align = tun->align, linear; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1105 | struct virtio_net_hdr gso = { 0 }; |
Jason Wang | 96f8d9e | 2013-11-13 14:00:39 +0800 | [diff] [blame] | 1106 | int good_linear; |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1107 | int copylen; |
| 1108 | bool zerocopy = false; |
| 1109 | int err; |
Eric Dumazet | 4997442 | 2012-12-12 19:22:57 +0000 | [diff] [blame] | 1110 | u32 rxhash; |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1111 | ssize_t n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
Eric Dumazet | 1bd4978a | 2015-12-16 08:57:37 -0800 | [diff] [blame] | 1113 | if (!(tun->dev->flags & IFF_UP)) |
| 1114 | return -EIO; |
| 1115 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1116 | if (!(tun->flags & IFF_NO_PI)) { |
Dan Carpenter | 15718ea | 2013-08-15 15:52:57 +0300 | [diff] [blame] | 1117 | if (len < sizeof(pi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | return -EINVAL; |
Dan Carpenter | 15718ea | 2013-08-15 15:52:57 +0300 | [diff] [blame] | 1119 | len -= sizeof(pi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1121 | n = copy_from_iter(&pi, sizeof(pi), from); |
| 1122 | if (n != sizeof(pi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | return -EFAULT; |
| 1124 | } |
| 1125 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1126 | if (tun->flags & IFF_VNET_HDR) { |
Dan Carpenter | 15718ea | 2013-08-15 15:52:57 +0300 | [diff] [blame] | 1127 | if (len < tun->vnet_hdr_sz) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1128 | return -EINVAL; |
Dan Carpenter | 15718ea | 2013-08-15 15:52:57 +0300 | [diff] [blame] | 1129 | len -= tun->vnet_hdr_sz; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1130 | |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1131 | n = copy_from_iter(&gso, sizeof(gso), from); |
| 1132 | if (n != sizeof(gso)) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1133 | return -EFAULT; |
| 1134 | |
Herbert Xu | 4909122 | 2009-06-08 00:20:01 -0700 | [diff] [blame] | 1135 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1136 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
| 1137 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); |
Herbert Xu | 4909122 | 2009-06-08 00:20:01 -0700 | [diff] [blame] | 1138 | |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1139 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1140 | return -EINVAL; |
Herbert Xu | d8febb7 | 2014-11-30 18:03:31 +0800 | [diff] [blame] | 1141 | iov_iter_advance(from, tun->vnet_hdr_sz - sizeof(gso)); |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1142 | } |
| 1143 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1144 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
stephen hemminger | a504b86 | 2011-06-08 14:33:07 +0000 | [diff] [blame] | 1145 | align += NET_IP_ALIGN; |
Herbert Xu | 0eca93b | 2009-04-14 02:09:43 -0700 | [diff] [blame] | 1146 | if (unlikely(len < ETH_HLEN || |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1147 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
Rusty Russell | e01bf1c | 2008-04-12 18:49:30 -0700 | [diff] [blame] | 1148 | return -EINVAL; |
| 1149 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1150 | |
Jason Wang | 96f8d9e | 2013-11-13 14:00:39 +0800 | [diff] [blame] | 1151 | good_linear = SKB_MAX_HEAD(align); |
| 1152 | |
Jason Wang | 8852917 | 2013-07-18 10:55:15 +0800 | [diff] [blame] | 1153 | if (msg_control) { |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1154 | struct iov_iter i = *from; |
| 1155 | |
Jason Wang | 8852917 | 2013-07-18 10:55:15 +0800 | [diff] [blame] | 1156 | /* There are 256 bytes to be copied in skb, so there is |
| 1157 | * enough room for skb expand head in case it is used. |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1158 | * The rest of the buffer is mapped from userspace. |
| 1159 | */ |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1160 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
Jason Wang | 96f8d9e | 2013-11-13 14:00:39 +0800 | [diff] [blame] | 1161 | if (copylen > good_linear) |
| 1162 | copylen = good_linear; |
Jason Wang | 3dd5c33 | 2013-07-10 13:43:27 +0800 | [diff] [blame] | 1163 | linear = copylen; |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1164 | iov_iter_advance(&i, copylen); |
| 1165 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) |
Jason Wang | 8852917 | 2013-07-18 10:55:15 +0800 | [diff] [blame] | 1166 | zerocopy = true; |
| 1167 | } |
| 1168 | |
| 1169 | if (!zerocopy) { |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1170 | copylen = len; |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1171 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) |
Jason Wang | 96f8d9e | 2013-11-13 14:00:39 +0800 | [diff] [blame] | 1172 | linear = good_linear; |
| 1173 | else |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1174 | linear = tun16_to_cpu(tun, gso.hdr_len); |
Jason Wang | 3dd5c33 | 2013-07-10 13:43:27 +0800 | [diff] [blame] | 1175 | } |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1176 | |
Jason Wang | 3dd5c33 | 2013-07-10 13:43:27 +0800 | [diff] [blame] | 1177 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1178 | if (IS_ERR(skb)) { |
| 1179 | if (PTR_ERR(skb) != -EAGAIN) |
| 1180 | tun->dev->stats.rx_dropped++; |
| 1181 | return PTR_ERR(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | } |
| 1183 | |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1184 | if (zerocopy) |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1185 | err = zerocopy_sg_from_iter(skb, from); |
Jason Wang | 8852917 | 2013-07-18 10:55:15 +0800 | [diff] [blame] | 1186 | else { |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1187 | err = skb_copy_datagram_from_iter(skb, 0, from, len); |
Jason Wang | 8852917 | 2013-07-18 10:55:15 +0800 | [diff] [blame] | 1188 | if (!err && msg_control) { |
| 1189 | struct ubuf_info *uarg = msg_control; |
| 1190 | uarg->callback(uarg, false); |
| 1191 | } |
| 1192 | } |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1193 | |
| 1194 | if (err) { |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 1195 | tun->dev->stats.rx_dropped++; |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 1196 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | return -EFAULT; |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 1198 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1200 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1201 | if (!skb_partial_csum_set(skb, tun16_to_cpu(tun, gso.csum_start), |
| 1202 | tun16_to_cpu(tun, gso.csum_offset))) { |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1203 | tun->dev->stats.rx_frame_errors++; |
| 1204 | kfree_skb(skb); |
| 1205 | return -EINVAL; |
| 1206 | } |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1207 | } |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | switch (tun->flags & TUN_TYPE_MASK) { |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1210 | case IFF_TUN: |
| 1211 | if (tun->flags & IFF_NO_PI) { |
Ang Way Chuang | f09f7ee | 2008-06-17 21:10:33 -0700 | [diff] [blame] | 1212 | switch (skb->data[0] & 0xf0) { |
| 1213 | case 0x40: |
| 1214 | pi.proto = htons(ETH_P_IP); |
| 1215 | break; |
| 1216 | case 0x60: |
| 1217 | pi.proto = htons(ETH_P_IPV6); |
| 1218 | break; |
| 1219 | default: |
| 1220 | tun->dev->stats.rx_dropped++; |
| 1221 | kfree_skb(skb); |
| 1222 | return -EINVAL; |
| 1223 | } |
| 1224 | } |
| 1225 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1226 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | skb->protocol = pi.proto; |
Arnaldo Carvalho de Melo | 4c13eb6 | 2007-04-25 17:40:23 -0700 | [diff] [blame] | 1228 | skb->dev = tun->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | break; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1230 | case IFF_TAP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | skb->protocol = eth_type_trans(skb, tun->dev); |
| 1232 | break; |
Joe Perches | 6403eab | 2011-06-03 11:51:20 +0000 | [diff] [blame] | 1233 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1235 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 1236 | pr_debug("GSO!\n"); |
| 1237 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| 1238 | case VIRTIO_NET_HDR_GSO_TCPV4: |
Pravin B Shelar | c9af6db | 2013-02-11 09:27:41 +0000 | [diff] [blame] | 1239 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1240 | break; |
| 1241 | case VIRTIO_NET_HDR_GSO_TCPV6: |
Pravin B Shelar | c9af6db | 2013-02-11 09:27:41 +0000 | [diff] [blame] | 1242 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1243 | break; |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 1244 | case VIRTIO_NET_HDR_GSO_UDP: |
Pravin B Shelar | c9af6db | 2013-02-11 09:27:41 +0000 | [diff] [blame] | 1245 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 1246 | break; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1247 | default: |
| 1248 | tun->dev->stats.rx_frame_errors++; |
| 1249 | kfree_skb(skb); |
| 1250 | return -EINVAL; |
| 1251 | } |
| 1252 | |
| 1253 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
Pravin B Shelar | c9af6db | 2013-02-11 09:27:41 +0000 | [diff] [blame] | 1254 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1255 | |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1256 | skb_shinfo(skb)->gso_size = tun16_to_cpu(tun, gso.gso_size); |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1257 | if (skb_shinfo(skb)->gso_size == 0) { |
| 1258 | tun->dev->stats.rx_frame_errors++; |
| 1259 | kfree_skb(skb); |
| 1260 | return -EINVAL; |
| 1261 | } |
| 1262 | |
| 1263 | /* Header must be checked, and gso_segs computed. */ |
| 1264 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 1265 | skb_shinfo(skb)->gso_segs = 0; |
| 1266 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1267 | |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1268 | /* copy skb_ubuf_info for callback when skb has no error */ |
| 1269 | if (zerocopy) { |
| 1270 | skb_shinfo(skb)->destructor_arg = msg_control; |
| 1271 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; |
Pravin B Shelar | c9af6db | 2013-02-11 09:27:41 +0000 | [diff] [blame] | 1272 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1273 | } |
| 1274 | |
Vlad Yasevich | 72f6510 | 2015-02-03 16:36:16 -0500 | [diff] [blame] | 1275 | skb_reset_network_header(skb); |
Jason Wang | 40893fd | 2013-03-26 23:11:22 +0000 | [diff] [blame] | 1276 | skb_probe_transport_header(skb, 0); |
Jason Wang | 38502af | 2013-03-25 20:19:56 +0000 | [diff] [blame] | 1277 | |
Tom Herbert | 3958afa1b | 2013-12-15 22:12:06 -0800 | [diff] [blame] | 1278 | rxhash = skb_get_hash(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | netif_rx_ni(skb); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1280 | |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 1281 | tun->dev->stats.rx_packets++; |
| 1282 | tun->dev->stats.rx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | |
Jason Wang | 9e85722 | 2013-01-28 01:05:19 +0000 | [diff] [blame] | 1284 | tun_flow_update(tun, rxhash, tfile); |
Michael S. Tsirkin | 0690899 | 2012-07-20 09:23:23 +0000 | [diff] [blame] | 1285 | return total_len; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1286 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1288 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | { |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1290 | struct file *file = iocb->ki_filp; |
Herbert Xu | ab46d77 | 2009-02-14 20:46:39 -0800 | [diff] [blame] | 1291 | struct tun_struct *tun = tun_get(file); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1292 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1293 | ssize_t result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | |
| 1295 | if (!tun) |
| 1296 | return -EBADFD; |
| 1297 | |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1298 | result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1299 | |
| 1300 | tun_put(tun); |
| 1301 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | } |
| 1303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | /* Put packet to the user space buffer */ |
stephen hemminger | 6f7c156 | 2011-06-08 14:33:08 +0000 | [diff] [blame] | 1305 | static ssize_t tun_put_user(struct tun_struct *tun, |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1306 | struct tun_file *tfile, |
stephen hemminger | 6f7c156 | 2011-06-08 14:33:08 +0000 | [diff] [blame] | 1307 | struct sk_buff *skb, |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1308 | struct iov_iter *iter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | { |
| 1310 | struct tun_pi pi = { 0, skb->protocol }; |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1311 | ssize_t total; |
Jason Wang | 8c847d2 | 2014-11-13 16:54:14 +0800 | [diff] [blame] | 1312 | int vlan_offset = 0; |
Herbert Xu | a8f9bfd | 2014-11-03 04:30:13 +0800 | [diff] [blame] | 1313 | int vlan_hlen = 0; |
Herbert Xu | 2eb783c | 2014-11-03 04:30:14 +0800 | [diff] [blame] | 1314 | int vnet_hdr_sz = 0; |
Herbert Xu | a8f9bfd | 2014-11-03 04:30:13 +0800 | [diff] [blame] | 1315 | |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 1316 | if (skb_vlan_tag_present(skb)) |
Herbert Xu | a8f9bfd | 2014-11-03 04:30:13 +0800 | [diff] [blame] | 1317 | vlan_hlen = VLAN_HLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1319 | if (tun->flags & IFF_VNET_HDR) |
Herbert Xu | 2eb783c | 2014-11-03 04:30:14 +0800 | [diff] [blame] | 1320 | vnet_hdr_sz = tun->vnet_hdr_sz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1322 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
| 1323 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1324 | if (!(tun->flags & IFF_NO_PI)) { |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1325 | if (iov_iter_count(iter) < sizeof(pi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | return -EINVAL; |
| 1327 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1328 | total += sizeof(pi); |
| 1329 | if (iov_iter_count(iter) < total) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | /* Packet will be striped */ |
| 1331 | pi.flags |= TUN_PKT_STRIP; |
| 1332 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1333 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1334 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | return -EFAULT; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1336 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | |
Herbert Xu | 2eb783c | 2014-11-03 04:30:14 +0800 | [diff] [blame] | 1338 | if (vnet_hdr_sz) { |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1339 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1340 | if (iov_iter_count(iter) < vnet_hdr_sz) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1341 | return -EINVAL; |
| 1342 | |
| 1343 | if (skb_is_gso(skb)) { |
| 1344 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
| 1345 | |
| 1346 | /* This is a hint as to how much should be linear. */ |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1347 | gso.hdr_len = cpu_to_tun16(tun, skb_headlen(skb)); |
| 1348 | gso.gso_size = cpu_to_tun16(tun, sinfo->gso_size); |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1349 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
| 1350 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| 1351 | else if (sinfo->gso_type & SKB_GSO_TCPV6) |
| 1352 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
Vlad Yasevich | e3e3c42 | 2015-02-03 16:36:17 -0500 | [diff] [blame] | 1353 | else if (sinfo->gso_type & SKB_GSO_UDP) |
| 1354 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
Michael S. Tsirkin | ef3db4a | 2010-07-21 04:32:45 +0000 | [diff] [blame] | 1355 | else { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1356 | pr_err("unexpected GSO type: " |
Michael S. Tsirkin | ef3db4a | 2010-07-21 04:32:45 +0000 | [diff] [blame] | 1357 | "0x%x, gso_size %d, hdr_len %d\n", |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1358 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), |
| 1359 | tun16_to_cpu(tun, gso.hdr_len)); |
Michael S. Tsirkin | ef3db4a | 2010-07-21 04:32:45 +0000 | [diff] [blame] | 1360 | print_hex_dump(KERN_ERR, "tun: ", |
| 1361 | DUMP_PREFIX_NONE, |
| 1362 | 16, 1, skb->head, |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1363 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); |
Michael S. Tsirkin | ef3db4a | 2010-07-21 04:32:45 +0000 | [diff] [blame] | 1364 | WARN_ON_ONCE(1); |
| 1365 | return -EINVAL; |
| 1366 | } |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1367 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
| 1368 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
| 1369 | } else |
| 1370 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 1371 | |
| 1372 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 1373 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
Michael S. Tsirkin | 56f0dcc | 2014-10-23 22:59:31 +0300 | [diff] [blame] | 1374 | gso.csum_start = cpu_to_tun16(tun, skb_checksum_start_offset(skb) + |
| 1375 | vlan_hlen); |
| 1376 | gso.csum_offset = cpu_to_tun16(tun, skb->csum_offset); |
Jason Wang | 10a8d94 | 2011-06-10 00:56:17 +0000 | [diff] [blame] | 1377 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
| 1378 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1379 | } /* else everything is zero */ |
| 1380 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1381 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1382 | return -EFAULT; |
Jason Wang | 8c847d2 | 2014-11-13 16:54:14 +0800 | [diff] [blame] | 1383 | |
| 1384 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1385 | } |
| 1386 | |
Herbert Xu | a8f9bfd | 2014-11-03 04:30:13 +0800 | [diff] [blame] | 1387 | if (vlan_hlen) { |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1388 | int ret; |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 1389 | struct { |
| 1390 | __be16 h_vlan_proto; |
| 1391 | __be16 h_vlan_TCI; |
| 1392 | } veth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 1394 | veth.h_vlan_proto = skb->vlan_proto; |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 1395 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 1397 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 1398 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1399 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
| 1400 | if (ret || !iov_iter_count(iter)) |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 1401 | goto done; |
| 1402 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1403 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
| 1404 | if (ret != sizeof(veth) || !iov_iter_count(iter)) |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 1405 | goto done; |
| 1406 | } |
| 1407 | |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1408 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 1409 | |
| 1410 | done: |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 1411 | tun->dev->stats.tx_packets++; |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1412 | tun->dev->stats.tx_bytes += skb->len + vlan_hlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | |
| 1414 | return total; |
| 1415 | } |
| 1416 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1417 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 1418 | struct iov_iter *to, |
| 1419 | int noblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | struct sk_buff *skb; |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 1422 | ssize_t ret; |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 1423 | int peeked, err, off = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | |
Rami Rosen | 3872baf | 2012-11-25 22:07:41 +0000 | [diff] [blame] | 1425 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 1427 | if (!iov_iter_count(to)) |
| 1428 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 1430 | if (tun->dev->reg_state != NETREG_REGISTERED) |
| 1431 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 1433 | /* Read frames from queue */ |
| 1434 | skb = __skb_recv_datagram(tfile->socket.sk, noblock ? MSG_DONTWAIT : 0, |
| 1435 | &peeked, &off, &err); |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1436 | if (!skb) |
Alex Gartrell | 957f094 | 2014-12-25 23:22:49 -0800 | [diff] [blame] | 1437 | return err; |
Herbert Xu | e0b46d0 | 2014-11-07 21:22:23 +0800 | [diff] [blame] | 1438 | |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 1439 | ret = tun_put_user(tun, tfile, skb, to); |
Jason Wang | f51a5e8 | 2014-12-01 16:53:15 +0800 | [diff] [blame] | 1440 | if (unlikely(ret < 0)) |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1441 | kfree_skb(skb); |
Jason Wang | f51a5e8 | 2014-12-01 16:53:15 +0800 | [diff] [blame] | 1442 | else |
| 1443 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1445 | return ret; |
| 1446 | } |
| 1447 | |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 1448 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1449 | { |
| 1450 | struct file *file = iocb->ki_filp; |
| 1451 | struct tun_file *tfile = file->private_data; |
| 1452 | struct tun_struct *tun = __tun_get(tfile); |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 1453 | ssize_t len = iov_iter_count(to), ret; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1454 | |
| 1455 | if (!tun) |
| 1456 | return -EBADFD; |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 1457 | ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK); |
David S. Miller | 42404c0 | 2013-12-10 22:05:45 -0500 | [diff] [blame] | 1458 | ret = min_t(ssize_t, ret, len); |
Zhi Yong Wu | d0b7da8a | 2013-12-06 14:16:51 +0800 | [diff] [blame] | 1459 | if (ret > 0) |
| 1460 | iocb->ki_pos = ret; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1461 | tun_put(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | return ret; |
| 1463 | } |
| 1464 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1465 | static void tun_free_netdev(struct net_device *dev) |
| 1466 | { |
| 1467 | struct tun_struct *tun = netdev_priv(dev); |
| 1468 | |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 1469 | BUG_ON(!(list_empty(&tun->disabled))); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1470 | tun_flow_uninit(tun); |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 1471 | security_tun_dev_free_security(tun->security); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1472 | free_netdev(dev); |
| 1473 | } |
| 1474 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | static void tun_setup(struct net_device *dev) |
| 1476 | { |
| 1477 | struct tun_struct *tun = netdev_priv(dev); |
| 1478 | |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 1479 | tun->owner = INVALID_UID; |
| 1480 | tun->group = INVALID_GID; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | dev->ethtool_ops = &tun_ethtool_ops; |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1483 | dev->destructor = tun_free_netdev; |
Jason Wang | 016adb7 | 2016-04-08 13:26:48 +0800 | [diff] [blame] | 1484 | /* We prefer our own queue length */ |
| 1485 | dev->tx_queue_len = TUN_READQ_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | } |
| 1487 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1488 | /* Trivial set of netlink ops to allow deleting tun or tap |
| 1489 | * device with netlink. |
| 1490 | */ |
| 1491 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 1492 | { |
| 1493 | return -EINVAL; |
| 1494 | } |
| 1495 | |
| 1496 | static struct rtnl_link_ops tun_link_ops __read_mostly = { |
| 1497 | .kind = DRV_NAME, |
| 1498 | .priv_size = sizeof(struct tun_struct), |
| 1499 | .setup = tun_setup, |
| 1500 | .validate = tun_validate, |
| 1501 | }; |
| 1502 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1503 | static void tun_sock_write_space(struct sock *sk) |
| 1504 | { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1505 | struct tun_file *tfile; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1506 | wait_queue_head_t *wqueue; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1507 | |
| 1508 | if (!sock_writeable(sk)) |
| 1509 | return; |
| 1510 | |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 1511 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1512 | return; |
| 1513 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1514 | wqueue = sk_sleep(sk); |
| 1515 | if (wqueue && waitqueue_active(wqueue)) |
| 1516 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1517 | POLLWRNORM | POLLWRBAND); |
Herbert Xu | c722c62 | 2009-06-03 21:45:55 -0700 | [diff] [blame] | 1518 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1519 | tfile = container_of(sk, struct tun_file, sk); |
| 1520 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1521 | } |
| 1522 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1523 | static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1524 | { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1525 | int ret; |
| 1526 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
| 1527 | struct tun_struct *tun = __tun_get(tfile); |
| 1528 | |
| 1529 | if (!tun) |
| 1530 | return -EBADFD; |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1531 | |
Al Viro | c0371da | 2014-11-24 10:42:55 -0500 | [diff] [blame] | 1532 | ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 1533 | m->msg_flags & MSG_DONTWAIT); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1534 | tun_put(tun); |
| 1535 | return ret; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1536 | } |
| 1537 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1538 | static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1539 | int flags) |
| 1540 | { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1541 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
| 1542 | struct tun_struct *tun = __tun_get(tfile); |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1543 | int ret; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1544 | |
| 1545 | if (!tun) |
| 1546 | return -EBADFD; |
| 1547 | |
Richard Cochran | eda2977 | 2013-07-19 19:40:10 +0200 | [diff] [blame] | 1548 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
Gao feng | 3811ae7 | 2013-04-24 21:59:23 +0000 | [diff] [blame] | 1549 | ret = -EINVAL; |
| 1550 | goto out; |
| 1551 | } |
Richard Cochran | eda2977 | 2013-07-19 19:40:10 +0200 | [diff] [blame] | 1552 | if (flags & MSG_ERRQUEUE) { |
| 1553 | ret = sock_recv_errqueue(sock->sk, m, total_len, |
| 1554 | SOL_PACKET, TUN_TX_TIMESTAMP); |
| 1555 | goto out; |
| 1556 | } |
Al Viro | c0371da | 2014-11-24 10:42:55 -0500 | [diff] [blame] | 1557 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT); |
Alex Gartrell | 8789793 | 2014-12-25 23:05:03 -0800 | [diff] [blame] | 1558 | if (ret > (ssize_t)total_len) { |
David S. Miller | 42404c0 | 2013-12-10 22:05:45 -0500 | [diff] [blame] | 1559 | m->msg_flags |= MSG_TRUNC; |
| 1560 | ret = flags & MSG_TRUNC ? ret : total_len; |
| 1561 | } |
Gao feng | 3811ae7 | 2013-04-24 21:59:23 +0000 | [diff] [blame] | 1562 | out: |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1563 | tun_put(tun); |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1564 | return ret; |
| 1565 | } |
| 1566 | |
| 1567 | /* Ops structure to mimic raw sockets with tun */ |
| 1568 | static const struct proto_ops tun_socket_ops = { |
| 1569 | .sendmsg = tun_sendmsg, |
| 1570 | .recvmsg = tun_recvmsg, |
| 1571 | }; |
| 1572 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1573 | static struct proto tun_proto = { |
| 1574 | .name = "tun", |
| 1575 | .owner = THIS_MODULE, |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1576 | .obj_size = sizeof(struct tun_file), |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1577 | }; |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1578 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1579 | static int tun_flags(struct tun_struct *tun) |
| 1580 | { |
Michael S. Tsirkin | 031f5e0 | 2014-11-19 14:44:40 +0200 | [diff] [blame] | 1581 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1582 | } |
| 1583 | |
| 1584 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, |
| 1585 | char *buf) |
| 1586 | { |
| 1587 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 1588 | return sprintf(buf, "0x%x\n", tun_flags(tun)); |
| 1589 | } |
| 1590 | |
| 1591 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, |
| 1592 | char *buf) |
| 1593 | { |
| 1594 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 1595 | return uid_valid(tun->owner)? |
| 1596 | sprintf(buf, "%u\n", |
| 1597 | from_kuid_munged(current_user_ns(), tun->owner)): |
| 1598 | sprintf(buf, "-1\n"); |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1599 | } |
| 1600 | |
| 1601 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, |
| 1602 | char *buf) |
| 1603 | { |
| 1604 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 1605 | return gid_valid(tun->group) ? |
| 1606 | sprintf(buf, "%u\n", |
| 1607 | from_kgid_munged(current_user_ns(), tun->group)): |
| 1608 | sprintf(buf, "-1\n"); |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1609 | } |
| 1610 | |
| 1611 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); |
| 1612 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); |
| 1613 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); |
| 1614 | |
Takashi Iwai | c4d33e2 | 2015-02-04 14:37:34 +0100 | [diff] [blame] | 1615 | static struct attribute *tun_dev_attrs[] = { |
| 1616 | &dev_attr_tun_flags.attr, |
| 1617 | &dev_attr_owner.attr, |
| 1618 | &dev_attr_group.attr, |
| 1619 | NULL |
| 1620 | }; |
| 1621 | |
| 1622 | static const struct attribute_group tun_attr_group = { |
| 1623 | .attrs = tun_dev_attrs |
| 1624 | }; |
| 1625 | |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 1626 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | { |
| 1628 | struct tun_struct *tun; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1629 | struct tun_file *tfile = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | struct net_device *dev; |
| 1631 | int err; |
| 1632 | |
Jason Wang | 7c0c3b1 | 2013-01-11 16:59:33 +0000 | [diff] [blame] | 1633 | if (tfile->detached) |
| 1634 | return -EINVAL; |
| 1635 | |
Eric W. Biederman | 74a3e5a | 2009-01-20 10:56:20 +0000 | [diff] [blame] | 1636 | dev = __dev_get_by_name(net, ifr->ifr_name); |
| 1637 | if (dev) { |
David Woodhouse | f85ba78 | 2009-04-27 03:23:54 -0700 | [diff] [blame] | 1638 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
| 1639 | return -EBUSY; |
Eric W. Biederman | 74a3e5a | 2009-01-20 10:56:20 +0000 | [diff] [blame] | 1640 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
| 1641 | tun = netdev_priv(dev); |
| 1642 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) |
| 1643 | tun = netdev_priv(dev); |
| 1644 | else |
| 1645 | return -EINVAL; |
| 1646 | |
Jason Wang | 8e6d91a | 2013-05-28 18:32:11 +0000 | [diff] [blame] | 1647 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1648 | !!(tun->flags & IFF_MULTI_QUEUE)) |
Jason Wang | 8e6d91a | 2013-05-28 18:32:11 +0000 | [diff] [blame] | 1649 | return -EINVAL; |
| 1650 | |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 1651 | if (tun_not_capable(tun)) |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1652 | return -EPERM; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 1653 | err = security_tun_dev_open(tun->security); |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1654 | if (err < 0) |
| 1655 | return err; |
| 1656 | |
Pavel Emelyanov | 849c9b6 | 2013-08-21 14:32:21 +0400 | [diff] [blame] | 1657 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 1658 | if (err < 0) |
| 1659 | return err; |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 1660 | |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1661 | if (tun->flags & IFF_MULTI_QUEUE && |
Jason Wang | e8dbad6 | 2013-04-22 20:40:39 +0000 | [diff] [blame] | 1662 | (tun->numqueues + tun->numdisabled > 1)) { |
| 1663 | /* One or more queue has already been attached, no need |
| 1664 | * to initialize the device again. |
| 1665 | */ |
| 1666 | return 0; |
| 1667 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1668 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | else { |
| 1670 | char *name; |
| 1671 | unsigned long flags = 0; |
Jason Wang | edfb6a1 | 2013-01-23 03:59:12 +0000 | [diff] [blame] | 1672 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
| 1673 | MAX_TAP_QUEUES : 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | |
Eric W. Biederman | c260b77 | 2012-11-18 21:34:11 +0000 | [diff] [blame] | 1675 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 1676 | return -EPERM; |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1677 | err = security_tun_dev_create(); |
| 1678 | if (err < 0) |
| 1679 | return err; |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 1680 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | /* Set dev type */ |
| 1682 | if (ifr->ifr_flags & IFF_TUN) { |
| 1683 | /* TUN device */ |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1684 | flags |= IFF_TUN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | name = "tun%d"; |
| 1686 | } else if (ifr->ifr_flags & IFF_TAP) { |
| 1687 | /* TAP device */ |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1688 | flags |= IFF_TAP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | name = "tap%d"; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1690 | } else |
Kusanagi Kouichi | 36989b9 | 2009-09-16 21:36:13 +0000 | [diff] [blame] | 1691 | return -EINVAL; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1692 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | if (*ifr->ifr_name) |
| 1694 | name = ifr->ifr_name; |
| 1695 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1696 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 1697 | NET_NAME_UNKNOWN, tun_setup, queues, |
| 1698 | queues); |
Jason Wang | edfb6a1 | 2013-01-23 03:59:12 +0000 | [diff] [blame] | 1699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | if (!dev) |
| 1701 | return -ENOMEM; |
| 1702 | |
Pavel Emelyanov | fc54c65 | 2008-04-16 00:41:53 -0700 | [diff] [blame] | 1703 | dev_net_set(dev, net); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1704 | dev->rtnl_link_ops = &tun_link_ops; |
Pavel Emelyanov | fb7589a | 2013-08-21 14:31:38 +0400 | [diff] [blame] | 1705 | dev->ifindex = tfile->ifindex; |
Takashi Iwai | c4d33e2 | 2015-02-04 14:37:34 +0100 | [diff] [blame] | 1706 | dev->sysfs_groups[0] = &tun_attr_group; |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | tun = netdev_priv(dev); |
| 1709 | tun->dev = dev; |
| 1710 | tun->flags = flags; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1711 | tun->txflt.count = 0; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 1712 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | |
Paolo Abeni | eaea34b | 2016-02-26 10:45:40 +0100 | [diff] [blame] | 1714 | tun->align = NET_SKB_PAD; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1715 | tun->filter_attached = false; |
| 1716 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1717 | |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1718 | spin_lock_init(&tun->lock); |
| 1719 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 1720 | err = security_tun_dev_alloc_security(&tun->security); |
| 1721 | if (err < 0) |
| 1722 | goto err_free_dev; |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | tun_net_init(dev); |
Pavel Emelyanov | 944a137 | 2013-06-11 17:01:08 +0400 | [diff] [blame] | 1725 | tun_flow_init(tun); |
Jason Wang | 96442e42 | 2012-10-31 19:46:02 +0000 | [diff] [blame] | 1726 | |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1727 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
Jason Wang | 6680ec6 | 2013-07-25 13:00:33 +0800 | [diff] [blame] | 1728 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
| 1729 | NETIF_F_HW_VLAN_STAG_TX; |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1730 | dev->features = dev->hw_features; |
Fernando Luis Vazquez Cao | 6671b22 | 2014-02-18 21:20:09 +0900 | [diff] [blame] | 1731 | dev->vlan_features = dev->features & |
| 1732 | ~(NETIF_F_HW_VLAN_CTAG_TX | |
| 1733 | NETIF_F_HW_VLAN_STAG_TX); |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1734 | |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 1735 | INIT_LIST_HEAD(&tun->disabled); |
Pavel Emelyanov | 849c9b6 | 2013-08-21 14:32:21 +0400 | [diff] [blame] | 1736 | err = tun_attach(tun, file, false); |
Jason Wang | eb0fb36 | 2012-12-02 17:19:45 +0000 | [diff] [blame] | 1737 | if (err < 0) |
Jason Wang | 662ca43 | 2013-09-11 18:09:48 +0800 | [diff] [blame] | 1738 | goto err_free_flow; |
Jason Wang | eb0fb36 | 2012-12-02 17:19:45 +0000 | [diff] [blame] | 1739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | err = register_netdevice(tun->dev); |
| 1741 | if (err < 0) |
Jason Wang | 662ca43 | 2013-09-11 18:09:48 +0800 | [diff] [blame] | 1742 | goto err_detach; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | } |
| 1744 | |
Michael S. Tsirkin | af668b3 | 2013-01-28 00:38:02 +0000 | [diff] [blame] | 1745 | netif_carrier_on(tun->dev); |
| 1746 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1747 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | |
Michael S. Tsirkin | 031f5e0 | 2014-11-19 14:44:40 +0200 | [diff] [blame] | 1749 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
| 1750 | (ifr->ifr_flags & TUN_FEATURES); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1751 | |
Max Krasnyansky | e35259a | 2008-07-10 16:59:11 -0700 | [diff] [blame] | 1752 | /* Make sure persistent devices do not get stuck in |
| 1753 | * xoff state. |
| 1754 | */ |
| 1755 | if (netif_running(tun->dev)) |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1756 | netif_tx_wake_all_queues(tun->dev); |
Max Krasnyansky | e35259a | 2008-07-10 16:59:11 -0700 | [diff] [blame] | 1757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | strcpy(ifr->ifr_name, tun->dev->name); |
| 1759 | return 0; |
| 1760 | |
Jason Wang | 662ca43 | 2013-09-11 18:09:48 +0800 | [diff] [blame] | 1761 | err_detach: |
| 1762 | tun_detach_all(dev); |
| 1763 | err_free_flow: |
| 1764 | tun_flow_uninit(tun); |
| 1765 | security_tun_dev_free_security(tun->security); |
| 1766 | err_free_dev: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | free_netdev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | return err; |
| 1769 | } |
| 1770 | |
Rami Rosen | 9ce99cf | 2012-11-23 03:58:10 +0000 | [diff] [blame] | 1771 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1772 | struct ifreq *ifr) |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1773 | { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1774 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1775 | |
| 1776 | strcpy(ifr->ifr_name, tun->dev->name); |
| 1777 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1778 | ifr->ifr_flags = tun_flags(tun); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1779 | |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1780 | } |
| 1781 | |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1782 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
| 1783 | * privs required. */ |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1784 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1785 | { |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 1786 | netdev_features_t features = 0; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1787 | |
| 1788 | if (arg & TUN_F_CSUM) { |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1789 | features |= NETIF_F_HW_CSUM; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1790 | arg &= ~TUN_F_CSUM; |
| 1791 | |
| 1792 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { |
| 1793 | if (arg & TUN_F_TSO_ECN) { |
| 1794 | features |= NETIF_F_TSO_ECN; |
| 1795 | arg &= ~TUN_F_TSO_ECN; |
| 1796 | } |
| 1797 | if (arg & TUN_F_TSO4) |
| 1798 | features |= NETIF_F_TSO; |
| 1799 | if (arg & TUN_F_TSO6) |
| 1800 | features |= NETIF_F_TSO6; |
| 1801 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); |
| 1802 | } |
Vlad Yasevich | e3e3c42 | 2015-02-03 16:36:17 -0500 | [diff] [blame] | 1803 | |
| 1804 | if (arg & TUN_F_UFO) { |
| 1805 | features |= NETIF_F_UFO; |
| 1806 | arg &= ~TUN_F_UFO; |
| 1807 | } |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1808 | } |
| 1809 | |
| 1810 | /* This gives the user a way to test for new features in future by |
| 1811 | * trying to set them. */ |
| 1812 | if (arg) |
| 1813 | return -EINVAL; |
| 1814 | |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1815 | tun->set_features = features; |
| 1816 | netdev_update_features(tun->dev); |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1817 | |
| 1818 | return 0; |
| 1819 | } |
| 1820 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1821 | static void tun_detach_filter(struct tun_struct *tun, int n) |
| 1822 | { |
| 1823 | int i; |
| 1824 | struct tun_file *tfile; |
| 1825 | |
| 1826 | for (i = 0; i < n; i++) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 1827 | tfile = rtnl_dereference(tun->tfiles[i]); |
Hannes Frederic Sowa | 8ced425 | 2016-04-05 17:10:16 +0200 | [diff] [blame] | 1828 | lock_sock(tfile->socket.sk); |
| 1829 | sk_detach_filter(tfile->socket.sk); |
| 1830 | release_sock(tfile->socket.sk); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1831 | } |
| 1832 | |
| 1833 | tun->filter_attached = false; |
| 1834 | } |
| 1835 | |
| 1836 | static int tun_attach_filter(struct tun_struct *tun) |
| 1837 | { |
| 1838 | int i, ret = 0; |
| 1839 | struct tun_file *tfile; |
| 1840 | |
| 1841 | for (i = 0; i < tun->numqueues; i++) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 1842 | tfile = rtnl_dereference(tun->tfiles[i]); |
Hannes Frederic Sowa | 8ced425 | 2016-04-05 17:10:16 +0200 | [diff] [blame] | 1843 | lock_sock(tfile->socket.sk); |
| 1844 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
| 1845 | release_sock(tfile->socket.sk); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1846 | if (ret) { |
| 1847 | tun_detach_filter(tun, i); |
| 1848 | return ret; |
| 1849 | } |
| 1850 | } |
| 1851 | |
| 1852 | tun->filter_attached = true; |
| 1853 | return ret; |
| 1854 | } |
| 1855 | |
| 1856 | static void tun_set_sndbuf(struct tun_struct *tun) |
| 1857 | { |
| 1858 | struct tun_file *tfile; |
| 1859 | int i; |
| 1860 | |
| 1861 | for (i = 0; i < tun->numqueues; i++) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 1862 | tfile = rtnl_dereference(tun->tfiles[i]); |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1863 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
| 1864 | } |
| 1865 | } |
| 1866 | |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 1867 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
| 1868 | { |
| 1869 | struct tun_file *tfile = file->private_data; |
| 1870 | struct tun_struct *tun; |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 1871 | int ret = 0; |
| 1872 | |
| 1873 | rtnl_lock(); |
| 1874 | |
| 1875 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 1876 | tun = tfile->detached; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 1877 | if (!tun) { |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 1878 | ret = -EINVAL; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 1879 | goto unlock; |
| 1880 | } |
| 1881 | ret = security_tun_dev_attach_queue(tun->security); |
| 1882 | if (ret < 0) |
| 1883 | goto unlock; |
Pavel Emelyanov | 849c9b6 | 2013-08-21 14:32:21 +0400 | [diff] [blame] | 1884 | ret = tun_attach(tun, file, false); |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 1885 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
Jason Wang | b8deabd | 2013-01-11 16:59:32 +0000 | [diff] [blame] | 1886 | tun = rtnl_dereference(tfile->tun); |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1887 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 1888 | ret = -EINVAL; |
| 1889 | else |
| 1890 | __tun_detach(tfile, false); |
| 1891 | } else |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 1892 | ret = -EINVAL; |
| 1893 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 1894 | unlock: |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 1895 | rtnl_unlock(); |
| 1896 | return ret; |
| 1897 | } |
| 1898 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1899 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
| 1900 | unsigned long arg, int ifreq_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | { |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1902 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1903 | struct tun_struct *tun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | void __user* argp = (void __user*)arg; |
| 1905 | struct ifreq ifr; |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 1906 | kuid_t owner; |
| 1907 | kgid_t group; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1908 | int sndbuf; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 1909 | int vnet_hdr_sz; |
Pavel Emelyanov | fb7589a | 2013-08-21 14:31:38 +0400 | [diff] [blame] | 1910 | unsigned int ifindex; |
Michael S. Tsirkin | 1cf8e41 | 2014-12-16 15:05:06 +0200 | [diff] [blame] | 1911 | int le; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1912 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 1914 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1915 | if (copy_from_user(&ifr, argp, ifreq_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | return -EFAULT; |
David S. Miller | 8bbb181 | 2012-07-30 14:52:48 -0700 | [diff] [blame] | 1917 | } else { |
Mathias Krause | a117dac | 2012-07-29 19:45:14 +0000 | [diff] [blame] | 1918 | memset(&ifr, 0, sizeof(ifr)); |
David S. Miller | 8bbb181 | 2012-07-30 14:52:48 -0700 | [diff] [blame] | 1919 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1920 | if (cmd == TUNGETFEATURES) { |
| 1921 | /* Currently this just means: "what IFF flags are valid?". |
| 1922 | * This is needed because we never checked for invalid flags on |
Michael S. Tsirkin | 031f5e0 | 2014-11-19 14:44:40 +0200 | [diff] [blame] | 1923 | * TUNSETIFF. |
| 1924 | */ |
| 1925 | return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1926 | (unsigned int __user*)argp); |
Jason Wang | cde8b15 | 2012-10-31 19:46:01 +0000 | [diff] [blame] | 1927 | } else if (cmd == TUNSETQUEUE) |
| 1928 | return tun_set_queue(file, &ifr); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1929 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 1930 | ret = 0; |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1931 | rtnl_lock(); |
| 1932 | |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1933 | tun = __tun_get(tfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | if (cmd == TUNSETIFF && !tun) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
| 1936 | |
Eric W. Biederman | 140e807da | 2015-05-08 21:07:08 -0500 | [diff] [blame] | 1937 | ret = tun_set_iff(sock_net(&tfile->sk), file, &ifr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1939 | if (ret) |
| 1940 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1942 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1943 | ret = -EFAULT; |
| 1944 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | } |
Pavel Emelyanov | fb7589a | 2013-08-21 14:31:38 +0400 | [diff] [blame] | 1946 | if (cmd == TUNSETIFINDEX) { |
| 1947 | ret = -EPERM; |
| 1948 | if (tun) |
| 1949 | goto unlock; |
| 1950 | |
| 1951 | ret = -EFAULT; |
| 1952 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) |
| 1953 | goto unlock; |
| 1954 | |
| 1955 | ret = 0; |
| 1956 | tfile->ifindex = ifindex; |
| 1957 | goto unlock; |
| 1958 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1960 | ret = -EBADFD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | if (!tun) |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1962 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | |
Jason Wang | 1e58833 | 2012-10-31 19:45:56 +0000 | [diff] [blame] | 1964 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1966 | ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | switch (cmd) { |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1968 | case TUNGETIFF: |
Rami Rosen | 9ce99cf | 2012-11-23 03:58:10 +0000 | [diff] [blame] | 1969 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1970 | |
Pavel Emelyanov | 3d407a8 | 2013-08-21 14:32:00 +0400 | [diff] [blame] | 1971 | if (tfile->detached) |
| 1972 | ifr.ifr_flags |= IFF_DETACH_QUEUE; |
Pavel Emelyanov | 849c9b6 | 2013-08-21 14:32:21 +0400 | [diff] [blame] | 1973 | if (!tfile->socket.sk->sk_filter) |
| 1974 | ifr.ifr_flags |= IFF_NOFILTER; |
Pavel Emelyanov | 3d407a8 | 2013-08-21 14:32:00 +0400 | [diff] [blame] | 1975 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1976 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1977 | ret = -EFAULT; |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1978 | break; |
| 1979 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | case TUNSETNOCSUM: |
| 1981 | /* Disable/Enable checksum */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1983 | /* [unimplemented] */ |
| 1984 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1985 | arg ? "disabled" : "enabled"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | break; |
| 1987 | |
| 1988 | case TUNSETPERSIST: |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1989 | /* Disable/Enable persist mode. Keep an extra reference to the |
| 1990 | * module to prevent the module being unprobed. |
| 1991 | */ |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1992 | if (arg && !(tun->flags & IFF_PERSIST)) { |
| 1993 | tun->flags |= IFF_PERSIST; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1994 | __module_get(THIS_MODULE); |
Jason Wang | dd38bd8 | 2013-01-11 16:59:34 +0000 | [diff] [blame] | 1995 | } |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 1996 | if (!arg && (tun->flags & IFF_PERSIST)) { |
| 1997 | tun->flags &= ~IFF_PERSIST; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 1998 | module_put(THIS_MODULE); |
| 1999 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 2001 | tun_debug(KERN_INFO, tun, "persist %s\n", |
| 2002 | arg ? "enabled" : "disabled"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | break; |
| 2004 | |
| 2005 | case TUNSETOWNER: |
| 2006 | /* Set owner of the device */ |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 2007 | owner = make_kuid(current_user_ns(), arg); |
| 2008 | if (!uid_valid(owner)) { |
| 2009 | ret = -EINVAL; |
| 2010 | break; |
| 2011 | } |
| 2012 | tun->owner = owner; |
Jason Wang | 1e58833 | 2012-10-31 19:45:56 +0000 | [diff] [blame] | 2013 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 2014 | from_kuid(&init_user_ns, tun->owner)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | break; |
| 2016 | |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 2017 | case TUNSETGROUP: |
| 2018 | /* Set group of the device */ |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 2019 | group = make_kgid(current_user_ns(), arg); |
| 2020 | if (!gid_valid(group)) { |
| 2021 | ret = -EINVAL; |
| 2022 | break; |
| 2023 | } |
| 2024 | tun->group = group; |
Jason Wang | 1e58833 | 2012-10-31 19:45:56 +0000 | [diff] [blame] | 2025 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
Eric W. Biederman | 0625c88 | 2012-02-07 16:48:55 -0800 | [diff] [blame] | 2026 | from_kgid(&init_user_ns, tun->group)); |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 2027 | break; |
| 2028 | |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 2029 | case TUNSETLINK: |
| 2030 | /* Only allow setting the type when the interface is down */ |
| 2031 | if (tun->dev->flags & IFF_UP) { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 2032 | tun_debug(KERN_INFO, tun, |
| 2033 | "Linktype set failed because interface is up\n"); |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 2034 | ret = -EBUSY; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 2035 | } else { |
| 2036 | tun->dev->type = (int) arg; |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 2037 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
| 2038 | tun->dev->type); |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 2039 | ret = 0; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 2040 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2041 | break; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 2042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | #ifdef TUN_DEBUG |
| 2044 | case TUNSETDEBUG: |
| 2045 | tun->debug = arg; |
| 2046 | break; |
| 2047 | #endif |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 2048 | case TUNSETOFFLOAD: |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 2049 | ret = set_offload(tun, arg); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2050 | break; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 2051 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 2052 | case TUNSETTXFILTER: |
| 2053 | /* Can be set only for TAPs */ |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2054 | ret = -EINVAL; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2055 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2056 | break; |
Harvey Harrison | c0e5a8c | 2008-07-16 12:45:34 -0700 | [diff] [blame] | 2057 | ret = update_filter(&tun->txflt, (void __user *)arg); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2058 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | |
| 2060 | case SIOCGIFHWADDR: |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 2061 | /* Get hw address */ |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 2062 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
| 2063 | ifr.ifr_hwaddr.sa_family = tun->dev->type; |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 2064 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2065 | ret = -EFAULT; |
| 2066 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | |
| 2068 | case SIOCSIFHWADDR: |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 2069 | /* Set hw address */ |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 2070 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
| 2071 | ifr.ifr_hwaddr.sa_data); |
Kim B. Heino | 4010237 | 2008-02-29 12:26:21 -0800 | [diff] [blame] | 2072 | |
Kim B. Heino | 4010237 | 2008-02-29 12:26:21 -0800 | [diff] [blame] | 2073 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2074 | break; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2075 | |
| 2076 | case TUNGETSNDBUF: |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2077 | sndbuf = tfile->socket.sk->sk_sndbuf; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2078 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
| 2079 | ret = -EFAULT; |
| 2080 | break; |
| 2081 | |
| 2082 | case TUNSETSNDBUF: |
| 2083 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { |
| 2084 | ret = -EFAULT; |
| 2085 | break; |
| 2086 | } |
| 2087 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 2088 | tun->sndbuf = sndbuf; |
| 2089 | tun_set_sndbuf(tun); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 2090 | break; |
| 2091 | |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 2092 | case TUNGETVNETHDRSZ: |
| 2093 | vnet_hdr_sz = tun->vnet_hdr_sz; |
| 2094 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) |
| 2095 | ret = -EFAULT; |
| 2096 | break; |
| 2097 | |
| 2098 | case TUNSETVNETHDRSZ: |
| 2099 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { |
| 2100 | ret = -EFAULT; |
| 2101 | break; |
| 2102 | } |
| 2103 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { |
| 2104 | ret = -EINVAL; |
| 2105 | break; |
| 2106 | } |
| 2107 | |
| 2108 | tun->vnet_hdr_sz = vnet_hdr_sz; |
| 2109 | break; |
| 2110 | |
Michael S. Tsirkin | 1cf8e41 | 2014-12-16 15:05:06 +0200 | [diff] [blame] | 2111 | case TUNGETVNETLE: |
| 2112 | le = !!(tun->flags & TUN_VNET_LE); |
| 2113 | if (put_user(le, (int __user *)argp)) |
| 2114 | ret = -EFAULT; |
| 2115 | break; |
| 2116 | |
| 2117 | case TUNSETVNETLE: |
| 2118 | if (get_user(le, (int __user *)argp)) { |
| 2119 | ret = -EFAULT; |
| 2120 | break; |
| 2121 | } |
| 2122 | if (le) |
| 2123 | tun->flags |= TUN_VNET_LE; |
| 2124 | else |
| 2125 | tun->flags &= ~TUN_VNET_LE; |
| 2126 | break; |
| 2127 | |
Greg Kurz | 8b8e658 | 2015-04-24 14:50:36 +0200 | [diff] [blame] | 2128 | case TUNGETVNETBE: |
| 2129 | ret = tun_get_vnet_be(tun, argp); |
| 2130 | break; |
| 2131 | |
| 2132 | case TUNSETVNETBE: |
| 2133 | ret = tun_set_vnet_be(tun, argp); |
| 2134 | break; |
| 2135 | |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 2136 | case TUNATTACHFILTER: |
| 2137 | /* Can be set only for TAPs */ |
| 2138 | ret = -EINVAL; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2139 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 2140 | break; |
| 2141 | ret = -EFAULT; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2142 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 2143 | break; |
| 2144 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 2145 | ret = tun_attach_filter(tun); |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 2146 | break; |
| 2147 | |
| 2148 | case TUNDETACHFILTER: |
| 2149 | /* Can be set only for TAPs */ |
| 2150 | ret = -EINVAL; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2151 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 2152 | break; |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 2153 | ret = 0; |
| 2154 | tun_detach_filter(tun, tun->numqueues); |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 2155 | break; |
| 2156 | |
Pavel Emelyanov | 76975e9 | 2013-08-21 14:32:39 +0400 | [diff] [blame] | 2157 | case TUNGETFILTER: |
| 2158 | ret = -EINVAL; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2159 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
Pavel Emelyanov | 76975e9 | 2013-08-21 14:32:39 +0400 | [diff] [blame] | 2160 | break; |
| 2161 | ret = -EFAULT; |
| 2162 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) |
| 2163 | break; |
| 2164 | ret = 0; |
| 2165 | break; |
| 2166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2167 | default: |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2168 | ret = -EINVAL; |
| 2169 | break; |
Joe Perches | ee289b6 | 2010-05-17 22:47:34 -0700 | [diff] [blame] | 2170 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 2172 | unlock: |
| 2173 | rtnl_unlock(); |
| 2174 | if (tun) |
| 2175 | tun_put(tun); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2176 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | } |
| 2178 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 2179 | static long tun_chr_ioctl(struct file *file, |
| 2180 | unsigned int cmd, unsigned long arg) |
| 2181 | { |
| 2182 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); |
| 2183 | } |
| 2184 | |
| 2185 | #ifdef CONFIG_COMPAT |
| 2186 | static long tun_chr_compat_ioctl(struct file *file, |
| 2187 | unsigned int cmd, unsigned long arg) |
| 2188 | { |
| 2189 | switch (cmd) { |
| 2190 | case TUNSETIFF: |
| 2191 | case TUNGETIFF: |
| 2192 | case TUNSETTXFILTER: |
| 2193 | case TUNGETSNDBUF: |
| 2194 | case TUNSETSNDBUF: |
| 2195 | case SIOCGIFHWADDR: |
| 2196 | case SIOCSIFHWADDR: |
| 2197 | arg = (unsigned long)compat_ptr(arg); |
| 2198 | break; |
| 2199 | default: |
| 2200 | arg = (compat_ulong_t)arg; |
| 2201 | break; |
| 2202 | } |
| 2203 | |
| 2204 | /* |
| 2205 | * compat_ifreq is shorter than ifreq, so we must not access beyond |
| 2206 | * the end of that structure. All fields that are used in this |
| 2207 | * driver are compatible though, we don't need to convert the |
| 2208 | * contents. |
| 2209 | */ |
| 2210 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); |
| 2211 | } |
| 2212 | #endif /* CONFIG_COMPAT */ |
| 2213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2214 | static int tun_chr_fasync(int fd, struct file *file, int on) |
| 2215 | { |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2216 | struct tun_file *tfile = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2217 | int ret; |
| 2218 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2219 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 2220 | goto out; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2221 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | if (on) { |
Jeff Layton | e0b93ed | 2014-08-22 11:27:32 -0400 | [diff] [blame] | 2223 | __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2224 | tfile->flags |= TUN_FASYNC; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2225 | } else |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2226 | tfile->flags &= ~TUN_FASYNC; |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 2227 | ret = 0; |
| 2228 | out: |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 2229 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | } |
| 2231 | |
| 2232 | static int tun_chr_open(struct inode *inode, struct file * file) |
| 2233 | { |
Eric W. Biederman | 140e807da | 2015-05-08 21:07:08 -0500 | [diff] [blame] | 2234 | struct net *net = current->nsproxy->net_ns; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2235 | struct tun_file *tfile; |
Thomas Gleixner | deed49f | 2009-10-14 01:19:46 -0700 | [diff] [blame] | 2236 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 2237 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2238 | |
Eric W. Biederman | 140e807da | 2015-05-08 21:07:08 -0500 | [diff] [blame] | 2239 | tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 2240 | &tun_proto, 0); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2241 | if (!tfile) |
| 2242 | return -ENOMEM; |
Monam Agarwal | c956674 | 2014-03-24 00:02:32 +0530 | [diff] [blame] | 2243 | RCU_INIT_POINTER(tfile->tun, NULL); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2244 | tfile->flags = 0; |
Pavel Emelyanov | fb7589a | 2013-08-21 14:31:38 +0400 | [diff] [blame] | 2245 | tfile->ifindex = 0; |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2246 | |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2247 | init_waitqueue_head(&tfile->wq.wait); |
Xi Wang | 9e641bd | 2014-05-16 15:11:48 -0700 | [diff] [blame] | 2248 | RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2249 | |
| 2250 | tfile->socket.file = file; |
| 2251 | tfile->socket.ops = &tun_socket_ops; |
| 2252 | |
| 2253 | sock_init_data(&tfile->socket, &tfile->sk); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2254 | |
| 2255 | tfile->sk.sk_write_space = tun_sock_write_space; |
| 2256 | tfile->sk.sk_sndbuf = INT_MAX; |
| 2257 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2258 | file->private_data = tfile; |
Jason Wang | 4008e97 | 2012-12-13 23:53:30 +0000 | [diff] [blame] | 2259 | INIT_LIST_HEAD(&tfile->next); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2260 | |
Jason Wang | 19a6afb | 2013-06-08 14:17:41 +0800 | [diff] [blame] | 2261 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
| 2262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | return 0; |
| 2264 | } |
| 2265 | |
| 2266 | static int tun_chr_close(struct inode *inode, struct file *file) |
| 2267 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 2268 | struct tun_file *tfile = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | |
Jason Wang | c8d68e6 | 2012-10-31 19:46:00 +0000 | [diff] [blame] | 2270 | tun_detach(tfile, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | |
| 2272 | return 0; |
| 2273 | } |
| 2274 | |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 2275 | #ifdef CONFIG_PROC_FS |
Joe Perches | a3816ab | 2014-09-29 16:08:25 -0700 | [diff] [blame] | 2276 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *f) |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 2277 | { |
| 2278 | struct tun_struct *tun; |
| 2279 | struct ifreq ifr; |
| 2280 | |
| 2281 | memset(&ifr, 0, sizeof(ifr)); |
| 2282 | |
| 2283 | rtnl_lock(); |
| 2284 | tun = tun_get(f); |
| 2285 | if (tun) |
| 2286 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
| 2287 | rtnl_unlock(); |
| 2288 | |
| 2289 | if (tun) |
| 2290 | tun_put(tun); |
| 2291 | |
Joe Perches | a3816ab | 2014-09-29 16:08:25 -0700 | [diff] [blame] | 2292 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 2293 | } |
| 2294 | #endif |
| 2295 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2296 | static const struct file_operations tun_fops = { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2297 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | .llseek = no_llseek, |
Al Viro | 9b06703 | 2014-11-07 13:52:07 -0500 | [diff] [blame] | 2299 | .read_iter = tun_chr_read_iter, |
Al Viro | f5ff53b | 2014-06-19 15:36:49 -0400 | [diff] [blame] | 2300 | .write_iter = tun_chr_write_iter, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | .poll = tun_chr_poll, |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 2302 | .unlocked_ioctl = tun_chr_ioctl, |
| 2303 | #ifdef CONFIG_COMPAT |
| 2304 | .compat_ioctl = tun_chr_compat_ioctl, |
| 2305 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | .open = tun_chr_open, |
| 2307 | .release = tun_chr_close, |
Masatake YAMATO | 93e14b6 | 2014-01-29 16:43:31 +0900 | [diff] [blame] | 2308 | .fasync = tun_chr_fasync, |
| 2309 | #ifdef CONFIG_PROC_FS |
| 2310 | .show_fdinfo = tun_chr_show_fdinfo, |
| 2311 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | }; |
| 2313 | |
| 2314 | static struct miscdevice tun_miscdev = { |
| 2315 | .minor = TUN_MINOR, |
| 2316 | .name = "tun", |
Kay Sievers | e454cea | 2009-09-18 23:01:12 +0200 | [diff] [blame] | 2317 | .nodename = "net/tun", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | .fops = &tun_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | }; |
| 2320 | |
| 2321 | /* ethtool interface */ |
| 2322 | |
| 2323 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) |
| 2324 | { |
| 2325 | cmd->supported = 0; |
| 2326 | cmd->advertising = 0; |
David Decotigny | 7073949 | 2011-04-27 18:32:40 +0000 | [diff] [blame] | 2327 | ethtool_cmd_speed_set(cmd, SPEED_10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | cmd->duplex = DUPLEX_FULL; |
| 2329 | cmd->port = PORT_TP; |
| 2330 | cmd->phy_address = 0; |
| 2331 | cmd->transceiver = XCVR_INTERNAL; |
| 2332 | cmd->autoneg = AUTONEG_DISABLE; |
| 2333 | cmd->maxtxpkt = 0; |
| 2334 | cmd->maxrxpkt = 0; |
| 2335 | return 0; |
| 2336 | } |
| 2337 | |
| 2338 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
| 2339 | { |
| 2340 | struct tun_struct *tun = netdev_priv(dev); |
| 2341 | |
Rick Jones | 33a5ba1 | 2011-11-15 14:59:53 +0000 | [diff] [blame] | 2342 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
| 2343 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2344 | |
| 2345 | switch (tun->flags & TUN_TYPE_MASK) { |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2346 | case IFF_TUN: |
Rick Jones | 33a5ba1 | 2011-11-15 14:59:53 +0000 | [diff] [blame] | 2347 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2348 | break; |
Michael S. Tsirkin | 40630b8 | 2014-11-19 15:17:31 +0200 | [diff] [blame] | 2349 | case IFF_TAP: |
Rick Jones | 33a5ba1 | 2011-11-15 14:59:53 +0000 | [diff] [blame] | 2350 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | break; |
| 2352 | } |
| 2353 | } |
| 2354 | |
| 2355 | static u32 tun_get_msglevel(struct net_device *dev) |
| 2356 | { |
| 2357 | #ifdef TUN_DEBUG |
| 2358 | struct tun_struct *tun = netdev_priv(dev); |
| 2359 | return tun->debug; |
| 2360 | #else |
| 2361 | return -EOPNOTSUPP; |
| 2362 | #endif |
| 2363 | } |
| 2364 | |
| 2365 | static void tun_set_msglevel(struct net_device *dev, u32 value) |
| 2366 | { |
| 2367 | #ifdef TUN_DEBUG |
| 2368 | struct tun_struct *tun = netdev_priv(dev); |
| 2369 | tun->debug = value; |
| 2370 | #endif |
| 2371 | } |
| 2372 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 2373 | static const struct ethtool_ops tun_ethtool_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | .get_settings = tun_get_settings, |
| 2375 | .get_drvinfo = tun_get_drvinfo, |
| 2376 | .get_msglevel = tun_get_msglevel, |
| 2377 | .set_msglevel = tun_set_msglevel, |
Nolan Leake | bee3136 | 2010-07-27 13:53:43 +0000 | [diff] [blame] | 2378 | .get_link = ethtool_op_get_link, |
Richard Cochran | eda2977 | 2013-07-19 19:40:10 +0200 | [diff] [blame] | 2379 | .get_ts_info = ethtool_op_get_ts_info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2380 | }; |
| 2381 | |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 2382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | static int __init tun_init(void) |
| 2384 | { |
| 2385 | int ret = 0; |
| 2386 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 2387 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
| 2388 | pr_info("%s\n", DRV_COPYRIGHT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2389 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2390 | ret = rtnl_link_register(&tun_link_ops); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 2391 | if (ret) { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 2392 | pr_err("Can't register link_ops\n"); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2393 | goto err_linkops; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 2394 | } |
| 2395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2396 | ret = misc_register(&tun_miscdev); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 2397 | if (ret) { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 2398 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 2399 | goto err_misc; |
| 2400 | } |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2401 | return 0; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 2402 | err_misc: |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2403 | rtnl_link_unregister(&tun_link_ops); |
| 2404 | err_linkops: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | return ret; |
| 2406 | } |
| 2407 | |
| 2408 | static void tun_cleanup(void) |
| 2409 | { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2410 | misc_deregister(&tun_miscdev); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 2411 | rtnl_link_unregister(&tun_link_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2412 | } |
| 2413 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2414 | /* Get an underlying socket object from tun file. Returns error unless file is |
| 2415 | * attached to a device. The returned object works like a packet socket, it |
| 2416 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for |
| 2417 | * holding a reference to the file for as long as the socket is in use. */ |
| 2418 | struct socket *tun_get_socket(struct file *file) |
| 2419 | { |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 2420 | struct tun_file *tfile; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2421 | if (file->f_op != &tun_fops) |
| 2422 | return ERR_PTR(-EINVAL); |
Jason Wang | 6e914fc | 2012-10-31 19:45:58 +0000 | [diff] [blame] | 2423 | tfile = file->private_data; |
| 2424 | if (!tfile) |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2425 | return ERR_PTR(-EBADFD); |
Jason Wang | 54f968d | 2012-10-31 19:45:57 +0000 | [diff] [blame] | 2426 | return &tfile->socket; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 2427 | } |
| 2428 | EXPORT_SYMBOL_GPL(tun_get_socket); |
| 2429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | module_init(tun_init); |
| 2431 | module_exit(tun_cleanup); |
| 2432 | MODULE_DESCRIPTION(DRV_DESCRIPTION); |
| 2433 | MODULE_AUTHOR(DRV_COPYRIGHT); |
| 2434 | MODULE_LICENSE("GPL"); |
| 2435 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 2436 | MODULE_ALIAS("devname:net/tun"); |