Release 4.7 drivers/net/loopback.c
/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* Pseudo-driver for the loopback interface.
*
* Version: @(#)loopback.c 1.0.4b 08/16/93
*
* Authors: Ross Biro
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
* Donald Becker, <becker@scyld.com>
*
* Alan Cox : Fixed oddments for NET3.014
* Alan Cox : Rejig for NET3.029 snap #3
* Alan Cox : Fixed NET3.029 bugs and sped up
* Larry McVoy : Tiny tweak to double performance
* Alan Cox : Backed out LMV's tweak - the linux mm
* can't take it...
* Michael Griffith: Don't bother computing the checksums
* on packets received on the loopback
* interface.
* Alexey Kuznetsov: Potential hang under some extreme
* cases removed.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/in.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/ethtool.h>
#include <net/sock.h>
#include <net/checksum.h>
#include <linux/if_ether.h> /* For the statistics structure. */
#include <linux/if_arp.h> /* For ARPHRD_ETHER */
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/percpu.h>
#include <net/net_namespace.h>
#include <linux/u64_stats_sync.h>
struct pcpu_lstats {
u64 packets;
u64 bytes;
struct u64_stats_sync syncp;
};
/*
* The higher levels take care of making this non-reentrant (it's
* called with bh's disabled).
*/
static netdev_tx_t loopback_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct pcpu_lstats *lb_stats;
int len;
skb_orphan(skb);
/* Before queueing this packet to netif_rx(),
* make sure dst is refcounted.
*/
skb_dst_force(skb);
skb->protocol = eth_type_trans(skb, dev);
/* it's OK to use per_cpu_ptr() because BHs are off */
lb_stats = this_cpu_ptr(dev->lstats);
len = skb->len;
if (likely(netif_rx(skb) == NET_RX_SUCCESS)) {
u64_stats_update_begin(&lb_stats->syncp);
lb_stats->bytes += len;
lb_stats->packets++;
u64_stats_update_end(&lb_stats->syncp);
}
return NETDEV_TX_OK;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric dumazet | eric dumazet | 51 | 48.11% | 6 | 31.58% |
| pre-git | pre-git | 40 | 37.74% | 6 | 31.58% |
| andrew morton | andrew morton | 8 | 7.55% | 1 | 5.26% |
| arthur kepner | arthur kepner | 2 | 1.89% | 1 | 5.26% |
| eric w. biederman | eric w. biederman | 2 | 1.89% | 2 | 10.53% |
| christoph lameter | christoph lameter | 1 | 0.94% | 1 | 5.26% |
| patrick mchardy | patrick mchardy | 1 | 0.94% | 1 | 5.26% |
| stephen hemminger | stephen hemminger | 1 | 0.94% | 1 | 5.26% |
| Total | 106 | 100.00% | 19 | 100.00% |
static struct rtnl_link_stats64 *loopback_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *stats)
{
u64 bytes = 0;
u64 packets = 0;
int i;
for_each_possible_cpu(i) {
const struct pcpu_lstats *lb_stats;
u64 tbytes, tpackets;
unsigned int start;
lb_stats = per_cpu_ptr(dev->lstats, i);
do {
start = u64_stats_fetch_begin_irq(&lb_stats->syncp);
tbytes = lb_stats->bytes;
tpackets = lb_stats->packets;
} while (u64_stats_fetch_retry_irq(&lb_stats->syncp, start));
bytes += tbytes;
packets += tpackets;
}
stats->rx_packets = packets;
stats->tx_packets = packets;
stats->rx_bytes = bytes;
stats->tx_bytes = bytes;
return stats;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric dumazet | eric dumazet | 90 | 66.18% | 5 | 35.71% |
| arthur kepner | arthur kepner | 19 | 13.97% | 2 | 14.29% |
| pre-git | pre-git | 12 | 8.82% | 2 | 14.29% |
| andrew morton | andrew morton | 11 | 8.09% | 2 | 14.29% |
| eric w. biederman | eric w. biederman | 3 | 2.21% | 2 | 14.29% |
| kamezawa hiroyuki | kamezawa hiroyuki | 1 | 0.74% | 1 | 7.14% |
| Total | 136 | 100.00% | 14 | 100.00% |
static u32 always_on(struct net_device *dev)
{
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 12 | 85.71% | 1 | 33.33% |
| adrian bunk | adrian bunk | 1 | 7.14% | 1 | 33.33% |
| stephen hemminger | stephen hemminger | 1 | 7.14% | 1 | 33.33% |
| Total | 14 | 100.00% | 3 | 100.00% |
static const struct ethtool_ops loopback_ethtool_ops = {
.get_link = always_on,
};
static int loopback_dev_init(struct net_device *dev)
{
dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
if (!dev->lstats)
return -ENOMEM;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 30 | 85.71% | 1 | 33.33% |
| eric dumazet | eric dumazet | 4 | 11.43% | 1 | 33.33% |
| americo wang | americo wang | 1 | 2.86% | 1 | 33.33% |
| Total | 35 | 100.00% | 3 | 100.00% |
static void loopback_dev_free(struct net_device *dev)
{
dev_net(dev)->loopback_dev = NULL;
free_percpu(dev->lstats);
free_netdev(dev);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 30 | 93.75% | 2 | 66.67% |
| eric dumazet | eric dumazet | 2 | 6.25% | 1 | 33.33% |
| Total | 32 | 100.00% | 3 | 100.00% |
static const struct net_device_ops loopback_ops = {
.ndo_init = loopback_dev_init,
.ndo_start_xmit= loopback_xmit,
.ndo_get_stats64 = loopback_get_stats64,
.ndo_set_mac_address = eth_mac_addr,
};
/*
* The loopback device is special. There is only one instance
* per network namespace.
*/
static void loopback_setup(struct net_device *dev)
{
dev->mtu = 64 * 1024;
dev->hard_header_len = ETH_HLEN; /* 14 */
dev->addr_len = ETH_ALEN; /* 6 */
dev->type = ARPHRD_LOOPBACK; /* 0x0001*/
dev->flags = IFF_LOOPBACK;
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
netif_keep_dst(dev);
dev->hw_features = NETIF_F_ALL_TSO | NETIF_F_UFO;
dev->features = NETIF_F_SG | NETIF_F_FRAGLIST
| NETIF_F_ALL_TSO
| NETIF_F_UFO
| NETIF_F_HW_CSUM
| NETIF_F_RXCSUM
| NETIF_F_SCTP_CRC
| NETIF_F_HIGHDMA
| NETIF_F_LLTX
| NETIF_F_NETNS_LOCAL
| NETIF_F_VLAN_CHALLENGED
| NETIF_F_LOOPBACK;
dev->ethtool_ops = &loopback_ethtool_ops;
dev->header_ops = ð_header_ops;
dev->netdev_ops = &loopback_ops;
dev->destructor = loopback_dev_free;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| daniel lezcano | daniel lezcano | 28 | 22.95% | 1 | 3.70% |
| pre-git | pre-git | 17 | 13.93% | 5 | 18.52% |
| michal miroslaw | michal miroslaw | 14 | 11.48% | 2 | 7.41% |
| stephen hemminger | stephen hemminger | 13 | 10.66% | 3 | 11.11% |
| eric w. biederman | eric w. biederman | 12 | 9.84% | 2 | 7.41% |
| linus torvalds | linus torvalds | 10 | 8.20% | 1 | 3.70% |
| eric dumazet | eric dumazet | 8 | 6.56% | 3 | 11.11% |
| americo wang | americo wang | 4 | 3.28% | 1 | 3.70% |
| david s. miller | david s. miller | 4 | 3.28% | 1 | 3.70% |
| krishna kumar | krishna kumar | 2 | 1.64% | 1 | 3.70% |
| arthur kepner | arthur kepner | 2 | 1.64% | 1 | 3.70% |
| phil sutter | phil sutter | 2 | 1.64% | 1 | 3.70% |
| mahesh bandewar | mahesh bandewar | 2 | 1.64% | 1 | 3.70% |
| chuck ebbert | chuck ebbert | 1 | 0.82% | 1 | 3.70% |
| daniel borkmann | daniel borkmann | 1 | 0.82% | 1 | 3.70% |
| tom herbert | tom herbert | 1 | 0.82% | 1 | 3.70% |
| emil medve | emil medve | 1 | 0.82% | 1 | 3.70% |
| Total | 122 | 100.00% | 27 | 100.00% |
/* Setup and register the loopback device. */
static __net_init int loopback_net_init(struct net *net)
{
struct net_device *dev;
int err;
err = -ENOMEM;
dev = alloc_netdev(0, "lo", NET_NAME_UNKNOWN, loopback_setup);
if (!dev)
goto out;
dev_net_set(dev, net);
err = register_netdev(dev);
if (err)
goto out_free_netdev;
BUG_ON(dev->ifindex != LOOPBACK_IFINDEX);
net->loopback_dev = dev;
return 0;
out_free_netdev:
free_netdev(dev);
out:
if (net_eq(net, &init_net))
panic("loopback: Failed to register netdevice: %d\n", err);
return err;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| daniel lezcano | daniel lezcano | 47 | 41.23% | 1 | 7.69% |
| pavel emelianov | pavel emelianov | 23 | 20.18% | 3 | 23.08% |
| herbert xu | herbert xu | 14 | 12.28% | 1 | 7.69% |
| eric w. biederman | eric w. biederman | 10 | 8.77% | 1 | 7.69% |
| stephen hemminger | stephen hemminger | 7 | 6.14% | 1 | 7.69% |
| hideaki yoshifuji | hideaki yoshifuji | 4 | 3.51% | 1 | 7.69% |
| octavian purdila | octavian purdila | 4 | 3.51% | 1 | 7.69% |
| tom gundersen | tom gundersen | 2 | 1.75% | 1 | 7.69% |
| pre-git | pre-git | 2 | 1.75% | 2 | 15.38% |
| adrian bunk | adrian bunk | 1 | 0.88% | 1 | 7.69% |
| Total | 114 | 100.00% | 13 | 100.00% |
/* Registered in net/core/dev.c */
struct pernet_operations __net_initdata loopback_net_ops = {
.init = loopback_net_init,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric dumazet | eric dumazet | 175 | 24.48% | 10 | 12.99% |
| pre-git | pre-git | 130 | 18.18% | 17 | 22.08% |
| eric w. biederman | eric w. biederman | 101 | 14.13% | 7 | 9.09% |
| daniel lezcano | daniel lezcano | 77 | 10.77% | 1 | 1.30% |
| stephen hemminger | stephen hemminger | 44 | 6.15% | 6 | 7.79% |
| david s. miller | david s. miller | 30 | 4.20% | 1 | 1.30% |
| arthur kepner | arthur kepner | 23 | 3.22% | 2 | 2.60% |
| pavel emelianov | pavel emelianov | 23 | 3.22% | 3 | 3.90% |
| andrew morton | andrew morton | 22 | 3.08% | 2 | 2.60% |
| herbert xu | herbert xu | 14 | 1.96% | 1 | 1.30% |
| michal miroslaw | michal miroslaw | 14 | 1.96% | 2 | 2.60% |
| americo wang | americo wang | 10 | 1.40% | 2 | 2.60% |
| linus torvalds | linus torvalds | 10 | 1.40% | 1 | 1.30% |
| alexey kuznetsov | alexey kuznetsov | 9 | 1.26% | 1 | 1.30% |
| octavian purdila | octavian purdila | 4 | 0.56% | 1 | 1.30% |
| hideaki yoshifuji | hideaki yoshifuji | 4 | 0.56% | 1 | 1.30% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 3 | 0.42% | 1 | 1.30% |
| adrian bunk | adrian bunk | 2 | 0.28% | 2 | 2.60% |
| krishna kumar | krishna kumar | 2 | 0.28% | 1 | 1.30% |
| mahesh bandewar | mahesh bandewar | 2 | 0.28% | 1 | 1.30% |
| phil sutter | phil sutter | 2 | 0.28% | 1 | 1.30% |
| tom gundersen | tom gundersen | 2 | 0.28% | 1 | 1.30% |
| denis v. lunev | denis v. lunev | 1 | 0.14% | 1 | 1.30% |
| christoph lameter | christoph lameter | 1 | 0.14% | 1 | 1.30% |
| jeff garzik | jeff garzik | 1 | 0.14% | 1 | 1.30% |
| kamezawa hiroyuki | kamezawa hiroyuki | 1 | 0.14% | 1 | 1.30% |
| tom herbert | tom herbert | 1 | 0.14% | 1 | 1.30% |
| daniel borkmann | daniel borkmann | 1 | 0.14% | 1 | 1.30% |
| ralf baechle | ralf baechle | 1 | 0.14% | 1 | 1.30% |
| rusty russell | rusty russell | 1 | 0.14% | 1 | 1.30% |
| patrick mchardy | patrick mchardy | 1 | 0.14% | 1 | 1.30% |
| jesper juhl | jesper juhl | 1 | 0.14% | 1 | 1.30% |
| emil medve | emil medve | 1 | 0.14% | 1 | 1.30% |
| chuck ebbert | chuck ebbert | 1 | 0.14% | 1 | 1.30% |
| Total | 715 | 100.00% | 77 | 100.00% |
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