Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 4 | * operating system. INET is implemented using the BSD Socket |
| 5 | * interface as the means of communication with the user level. |
| 6 | * |
| 7 | * Pseudo-driver for the loopback interface. |
| 8 | * |
| 9 | * Version: @(#)loopback.c 1.0.4b 08/16/93 |
| 10 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 11 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 13 | * Donald Becker, <becker@scyld.com> |
| 14 | * |
| 15 | * Alan Cox : Fixed oddments for NET3.014 |
| 16 | * Alan Cox : Rejig for NET3.029 snap #3 |
Ezequiel Lara Gomez | b3407c8 | 2017-03-11 20:06:01 +0000 | [diff] [blame] | 17 | * Alan Cox : Fixed NET3.029 bugs and sped up |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * Larry McVoy : Tiny tweak to double performance |
| 19 | * Alan Cox : Backed out LMV's tweak - the linux mm |
| 20 | * can't take it... |
| 21 | * Michael Griffith: Don't bother computing the checksums |
| 22 | * on packets received on the loopback |
| 23 | * interface. |
| 24 | * Alexey Kuznetsov: Potential hang under some extreme |
| 25 | * cases removed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | */ |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/jiffies.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/interrupt.h> |
| 31 | #include <linux/fs.h> |
| 32 | #include <linux/types.h> |
| 33 | #include <linux/string.h> |
| 34 | #include <linux/socket.h> |
| 35 | #include <linux/errno.h> |
| 36 | #include <linux/fcntl.h> |
| 37 | #include <linux/in.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 39 | #include <linux/uaccess.h> |
Ezequiel Lara Gomez | b3407c8 | 2017-03-11 20:06:01 +0000 | [diff] [blame] | 40 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | #include <linux/inet.h> |
| 43 | #include <linux/netdevice.h> |
| 44 | #include <linux/etherdevice.h> |
| 45 | #include <linux/skbuff.h> |
| 46 | #include <linux/ethtool.h> |
| 47 | #include <net/sock.h> |
| 48 | #include <net/checksum.h> |
| 49 | #include <linux/if_ether.h> /* For the statistics structure. */ |
| 50 | #include <linux/if_arp.h> /* For ARPHRD_ETHER */ |
| 51 | #include <linux/ip.h> |
| 52 | #include <linux/tcp.h> |
| 53 | #include <linux/percpu.h> |
Ezequiel Lara Gomez | 6df014c | 2017-03-11 20:06:54 +0000 | [diff] [blame] | 54 | #include <linux/net_tstamp.h> |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 55 | #include <net/net_namespace.h> |
Eric Dumazet | 5eaa0bd | 2010-06-22 12:44:11 +0000 | [diff] [blame] | 56 | #include <linux/u64_stats_sync.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Mahesh Bandewar | 4de83b8 | 2019-07-01 14:38:49 -0700 | [diff] [blame] | 58 | /* blackhole_netdev - a device used for dsts that are marked expired! |
| 59 | * This is global device (instead of per-net-ns) since it's not needed |
| 60 | * to be per-ns and gets initialized at boot time. |
| 61 | */ |
| 62 | struct net_device *blackhole_netdev; |
| 63 | EXPORT_SYMBOL(blackhole_netdev); |
| 64 | |
Ezequiel Lara Gomez | b3407c8 | 2017-03-11 20:06:01 +0000 | [diff] [blame] | 65 | /* The higher levels take care of making this non-reentrant (it's |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | * called with bh's disabled). |
| 67 | */ |
Stephen Hemminger | 61357325 | 2009-08-31 19:50:58 +0000 | [diff] [blame] | 68 | static netdev_tx_t loopback_xmit(struct sk_buff *skb, |
| 69 | struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | { |
Eric Dumazet | 7eebb0b | 2009-04-17 22:03:10 +0000 | [diff] [blame] | 71 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Ezequiel Lara Gomez | 6df014c | 2017-03-11 20:06:54 +0000 | [diff] [blame] | 73 | skb_tx_timestamp(skb); |
Eric Dumazet | 4c16128 | 2018-10-19 19:11:26 -0700 | [diff] [blame] | 74 | |
| 75 | /* do not fool net_timestamp_check() with various clock bases */ |
| 76 | skb->tstamp = 0; |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | skb_orphan(skb); |
| 79 | |
Eric Dumazet | 794ed39 | 2013-01-25 07:44:41 +0000 | [diff] [blame] | 80 | /* Before queueing this packet to netif_rx(), |
| 81 | * make sure dst is refcounted. |
| 82 | */ |
| 83 | skb_dst_force(skb); |
| 84 | |
Eric Dumazet | 7eebb0b | 2009-04-17 22:03:10 +0000 | [diff] [blame] | 85 | skb->protocol = eth_type_trans(skb, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Eric Dumazet | 7eebb0b | 2009-04-17 22:03:10 +0000 | [diff] [blame] | 87 | len = skb->len; |
Eric Dumazet | dd5382a | 2019-11-07 16:27:15 -0800 | [diff] [blame] | 88 | if (likely(netif_rx(skb) == NET_RX_SUCCESS)) |
| 89 | dev_lstats_add(dev, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 91 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
Eric Dumazet | de7d508 | 2019-11-07 16:27:14 -0800 | [diff] [blame] | 94 | void dev_lstats_read(struct net_device *dev, u64 *packets, u64 *bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | int i; |
| 97 | |
Eric Dumazet | de7d508 | 2019-11-07 16:27:14 -0800 | [diff] [blame] | 98 | *packets = 0; |
| 99 | *bytes = 0; |
| 100 | |
KAMEZAWA Hiroyuki | 0fed484 | 2006-03-28 01:56:37 -0800 | [diff] [blame] | 101 | for_each_possible_cpu(i) { |
Eric Dumazet | 5175c378 | 2006-10-18 20:51:57 -0700 | [diff] [blame] | 102 | const struct pcpu_lstats *lb_stats; |
Eric Dumazet | 5eaa0bd | 2010-06-22 12:44:11 +0000 | [diff] [blame] | 103 | u64 tbytes, tpackets; |
| 104 | unsigned int start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
Eric Dumazet | a7855c7 | 2010-09-23 23:51:51 +0000 | [diff] [blame] | 106 | lb_stats = per_cpu_ptr(dev->lstats, i); |
Eric Dumazet | 5eaa0bd | 2010-06-22 12:44:11 +0000 | [diff] [blame] | 107 | do { |
Eric W. Biederman | 57a7744 | 2014-03-13 21:26:42 -0700 | [diff] [blame] | 108 | start = u64_stats_fetch_begin_irq(&lb_stats->syncp); |
Eric Dumazet | fd2f473 | 2019-11-07 16:27:22 -0800 | [diff] [blame] | 109 | tpackets = u64_stats_read(&lb_stats->packets); |
| 110 | tbytes = u64_stats_read(&lb_stats->bytes); |
Eric W. Biederman | 57a7744 | 2014-03-13 21:26:42 -0700 | [diff] [blame] | 111 | } while (u64_stats_fetch_retry_irq(&lb_stats->syncp, start)); |
Eric Dumazet | de7d508 | 2019-11-07 16:27:14 -0800 | [diff] [blame] | 112 | *bytes += tbytes; |
| 113 | *packets += tpackets; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | } |
Eric Dumazet | de7d508 | 2019-11-07 16:27:14 -0800 | [diff] [blame] | 115 | } |
| 116 | EXPORT_SYMBOL(dev_lstats_read); |
| 117 | |
| 118 | static void loopback_get_stats64(struct net_device *dev, |
| 119 | struct rtnl_link_stats64 *stats) |
| 120 | { |
| 121 | u64 packets, bytes; |
| 122 | |
| 123 | dev_lstats_read(dev, &packets, &bytes); |
| 124 | |
Eric Dumazet | 5175c378 | 2006-10-18 20:51:57 -0700 | [diff] [blame] | 125 | stats->rx_packets = packets; |
| 126 | stats->tx_packets = packets; |
Eric Dumazet | 7eebb0b | 2009-04-17 22:03:10 +0000 | [diff] [blame] | 127 | stats->rx_bytes = bytes; |
| 128 | stats->tx_bytes = bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | } |
| 130 | |
Stephen Hemminger | 7fa6b06 | 2006-09-27 20:33:34 -0700 | [diff] [blame] | 131 | static u32 always_on(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | { |
| 133 | return 1; |
| 134 | } |
| 135 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 136 | static const struct ethtool_ops loopback_ethtool_ops = { |
Stephen Hemminger | 7fa6b06 | 2006-09-27 20:33:34 -0700 | [diff] [blame] | 137 | .get_link = always_on, |
Julian Wiedmann | af73034 | 2019-04-12 13:06:14 +0200 | [diff] [blame] | 138 | .get_ts_info = ethtool_op_get_ts_info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | }; |
| 140 | |
Eric W. Biederman | 5f6d88b | 2007-09-26 22:08:12 -0700 | [diff] [blame] | 141 | static int loopback_dev_init(struct net_device *dev) |
| 142 | { |
WANG Cong | 1c213bd | 2014-02-13 11:46:28 -0800 | [diff] [blame] | 143 | dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); |
Eric Dumazet | a7855c7 | 2010-09-23 23:51:51 +0000 | [diff] [blame] | 144 | if (!dev->lstats) |
Eric W. Biederman | 5f6d88b | 2007-09-26 22:08:12 -0700 | [diff] [blame] | 145 | return -ENOMEM; |
Eric W. Biederman | 5f6d88b | 2007-09-26 22:08:12 -0700 | [diff] [blame] | 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | static void loopback_dev_free(struct net_device *dev) |
| 150 | { |
Eric W. Biederman | e05e907 | 2013-09-16 16:52:41 -0700 | [diff] [blame] | 151 | dev_net(dev)->loopback_dev = NULL; |
Eric Dumazet | a7855c7 | 2010-09-23 23:51:51 +0000 | [diff] [blame] | 152 | free_percpu(dev->lstats); |
Eric W. Biederman | 5f6d88b | 2007-09-26 22:08:12 -0700 | [diff] [blame] | 153 | } |
| 154 | |
Stephen Hemminger | c02373bf | 2008-11-19 21:46:18 -0800 | [diff] [blame] | 155 | static const struct net_device_ops loopback_ops = { |
Ezequiel Lara Gomez | b3407c8 | 2017-03-11 20:06:01 +0000 | [diff] [blame] | 156 | .ndo_init = loopback_dev_init, |
| 157 | .ndo_start_xmit = loopback_xmit, |
Eric Dumazet | 6b10de3 | 2010-06-14 05:59:22 +0000 | [diff] [blame] | 158 | .ndo_get_stats64 = loopback_get_stats64, |
WANG Cong | 25f929f | 2014-02-11 17:21:26 -0800 | [diff] [blame] | 159 | .ndo_set_mac_address = eth_mac_addr, |
Stephen Hemminger | c02373bf | 2008-11-19 21:46:18 -0800 | [diff] [blame] | 160 | }; |
| 161 | |
Mahesh Bandewar | 4de83b8 | 2019-07-01 14:38:49 -0700 | [diff] [blame] | 162 | static void gen_lo_setup(struct net_device *dev, |
| 163 | unsigned int mtu, |
| 164 | const struct ethtool_ops *eth_ops, |
| 165 | const struct header_ops *hdr_ops, |
| 166 | const struct net_device_ops *dev_ops, |
| 167 | void (*dev_destructor)(struct net_device *dev)) |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 168 | { |
Mahesh Bandewar | 4de83b8 | 2019-07-01 14:38:49 -0700 | [diff] [blame] | 169 | dev->mtu = mtu; |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 170 | dev->hard_header_len = ETH_HLEN; /* 14 */ |
Willem de Bruijn | 217e6fa | 2017-02-07 15:57:20 -0500 | [diff] [blame] | 171 | dev->min_header_len = ETH_HLEN; /* 14 */ |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 172 | dev->addr_len = ETH_ALEN; /* 6 */ |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 173 | dev->type = ARPHRD_LOOPBACK; /* 0x0001*/ |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 174 | dev->flags = IFF_LOOPBACK; |
Phil Sutter | e65db2b | 2015-08-18 10:30:32 +0200 | [diff] [blame] | 175 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; |
Eric Dumazet | 0287587 | 2014-10-05 18:38:35 -0700 | [diff] [blame] | 176 | netif_keep_dst(dev); |
Marcelo Ricardo Leitner | f6c382f | 2016-06-02 15:05:38 -0300 | [diff] [blame] | 177 | dev->hw_features = NETIF_F_GSO_SOFTWARE; |
Ezequiel Lara Gomez | b3407c8 | 2017-03-11 20:06:01 +0000 | [diff] [blame] | 178 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST |
Marcelo Ricardo Leitner | f6c382f | 2016-06-02 15:05:38 -0300 | [diff] [blame] | 179 | | NETIF_F_GSO_SOFTWARE |
Michał Mirosław | 34324dc | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 180 | | NETIF_F_HW_CSUM |
Michał Mirosław | cf0bdef | 2011-02-15 16:59:18 +0000 | [diff] [blame] | 181 | | NETIF_F_RXCSUM |
Tom Herbert | 53692b1 | 2015-12-14 11:19:41 -0800 | [diff] [blame] | 182 | | NETIF_F_SCTP_CRC |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 183 | | NETIF_F_HIGHDMA |
| 184 | | NETIF_F_LLTX |
Krishna Kumar | 0553c89 | 2011-04-14 06:07:04 +0000 | [diff] [blame] | 185 | | NETIF_F_NETNS_LOCAL |
Mahesh Bandewar | eed2a12 | 2011-05-04 15:30:11 +0000 | [diff] [blame] | 186 | | NETIF_F_VLAN_CHALLENGED |
| 187 | | NETIF_F_LOOPBACK; |
Mahesh Bandewar | 4de83b8 | 2019-07-01 14:38:49 -0700 | [diff] [blame] | 188 | dev->ethtool_ops = eth_ops; |
| 189 | dev->header_ops = hdr_ops; |
| 190 | dev->netdev_ops = dev_ops; |
David S. Miller | cf124db | 2017-05-08 12:52:56 -0400 | [diff] [blame] | 191 | dev->needs_free_netdev = true; |
Mahesh Bandewar | 4de83b8 | 2019-07-01 14:38:49 -0700 | [diff] [blame] | 192 | dev->priv_destructor = dev_destructor; |
| 193 | } |
| 194 | |
| 195 | /* The loopback device is special. There is only one instance |
| 196 | * per network namespace. |
| 197 | */ |
| 198 | static void loopback_setup(struct net_device *dev) |
| 199 | { |
| 200 | gen_lo_setup(dev, (64 * 1024), &loopback_ethtool_ops, ð_header_ops, |
| 201 | &loopback_ops, loopback_dev_free); |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 202 | } |
Daniel Lezcano | de3cb74 | 2007-09-25 19:16:28 -0700 | [diff] [blame] | 203 | |
Ralf Baechle | 2278364 | 2005-08-18 14:05:18 -0700 | [diff] [blame] | 204 | /* Setup and register the loopback device. */ |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 205 | static __net_init int loopback_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | { |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 207 | struct net_device *dev; |
| 208 | int err; |
Herbert Xu | aeed9e8 | 2007-07-30 16:37:19 -0700 | [diff] [blame] | 209 | |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 210 | err = -ENOMEM; |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 211 | dev = alloc_netdev(0, "lo", NET_NAME_UNKNOWN, loopback_setup); |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 212 | if (!dev) |
| 213 | goto out; |
| 214 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 215 | dev_net_set(dev, net); |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 216 | err = register_netdev(dev); |
| 217 | if (err) |
| 218 | goto out_free_netdev; |
| 219 | |
Pavel Emelyanov | 1fb9489 | 2012-08-08 21:53:36 +0000 | [diff] [blame] | 220 | BUG_ON(dev->ifindex != LOOPBACK_IFINDEX); |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 221 | net->loopback_dev = dev; |
Pavel Emelyanov | 9d6dda32 | 2007-10-15 12:55:33 -0700 | [diff] [blame] | 222 | return 0; |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 223 | |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 224 | out_free_netdev: |
| 225 | free_netdev(dev); |
Pavel Emelyanov | 9d6dda32 | 2007-10-15 12:55:33 -0700 | [diff] [blame] | 226 | out: |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 227 | if (net_eq(net, &init_net)) |
Pavel Emelyanov | 9d6dda32 | 2007-10-15 12:55:33 -0700 | [diff] [blame] | 228 | panic("loopback: Failed to register netdevice: %d\n", err); |
| 229 | return err; |
Daniel Lezcano | 854d836 | 2007-09-25 19:18:04 -0700 | [diff] [blame] | 230 | } |
Adrian Bunk | 60903f2 | 2007-01-02 00:35:48 -0800 | [diff] [blame] | 231 | |
Eric W. Biederman | 505d4f7 | 2008-11-07 22:54:20 -0800 | [diff] [blame] | 232 | /* Registered in net/core/dev.c */ |
| 233 | struct pernet_operations __net_initdata loopback_net_ops = { |
Ezequiel Lara Gomez | b3407c8 | 2017-03-11 20:06:01 +0000 | [diff] [blame] | 234 | .init = loopback_net_init, |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 235 | }; |
Mahesh Bandewar | 4de83b8 | 2019-07-01 14:38:49 -0700 | [diff] [blame] | 236 | |
| 237 | /* blackhole netdevice */ |
| 238 | static netdev_tx_t blackhole_netdev_xmit(struct sk_buff *skb, |
| 239 | struct net_device *dev) |
| 240 | { |
| 241 | kfree_skb(skb); |
| 242 | net_warn_ratelimited("%s(): Dropping skb.\n", __func__); |
| 243 | return NETDEV_TX_OK; |
| 244 | } |
| 245 | |
| 246 | static const struct net_device_ops blackhole_netdev_ops = { |
| 247 | .ndo_start_xmit = blackhole_netdev_xmit, |
| 248 | }; |
| 249 | |
| 250 | /* This is a dst-dummy device used specifically for invalidated |
| 251 | * DSTs and unlike loopback, this is not per-ns. |
| 252 | */ |
| 253 | static void blackhole_netdev_setup(struct net_device *dev) |
| 254 | { |
| 255 | gen_lo_setup(dev, ETH_MIN_MTU, NULL, NULL, &blackhole_netdev_ops, NULL); |
| 256 | } |
| 257 | |
| 258 | /* Setup and register the blackhole_netdev. */ |
| 259 | static int __init blackhole_netdev_init(void) |
| 260 | { |
| 261 | blackhole_netdev = alloc_netdev(0, "blackhole_dev", NET_NAME_UNKNOWN, |
| 262 | blackhole_netdev_setup); |
| 263 | if (!blackhole_netdev) |
| 264 | return -ENOMEM; |
| 265 | |
Mahesh Bandewar | d62962b | 2019-07-02 23:16:31 -0700 | [diff] [blame] | 266 | rtnl_lock(); |
Mahesh Bandewar | 4de83b8 | 2019-07-01 14:38:49 -0700 | [diff] [blame] | 267 | dev_init_scheduler(blackhole_netdev); |
| 268 | dev_activate(blackhole_netdev); |
Mahesh Bandewar | d62962b | 2019-07-02 23:16:31 -0700 | [diff] [blame] | 269 | rtnl_unlock(); |
Mahesh Bandewar | 4de83b8 | 2019-07-01 14:38:49 -0700 | [diff] [blame] | 270 | |
| 271 | blackhole_netdev->flags |= IFF_UP | IFF_RUNNING; |
| 272 | dev_net_set(blackhole_netdev, &init_net); |
| 273 | |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 277 | device_initcall(blackhole_netdev_init); |