Contributors: 38
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Eric Dumazet |
166 |
23.06% |
11 |
13.10% |
| Linus Torvalds (pre-git) |
124 |
17.22% |
15 |
17.86% |
| Eric W. Biedermann |
94 |
13.06% |
7 |
8.33% |
| Daniel Lezcano |
77 |
10.69% |
1 |
1.19% |
| Stephen Hemminger |
45 |
6.25% |
7 |
8.33% |
| David S. Miller |
37 |
5.14% |
2 |
2.38% |
| Pavel Emelyanov |
23 |
3.19% |
3 |
3.57% |
| Andrew Morton |
22 |
3.06% |
2 |
2.38% |
| Arthur Kepner |
21 |
2.92% |
2 |
2.38% |
| Ezequiel Lara Gomez |
15 |
2.08% |
2 |
2.38% |
| Herbert Xu |
14 |
1.94% |
1 |
1.19% |
| Linus Torvalds |
11 |
1.53% |
2 |
2.38% |
| Américo Wang |
10 |
1.39% |
2 |
2.38% |
| Alexey Kuznetsov |
9 |
1.25% |
1 |
1.19% |
| Michał Mirosław |
8 |
1.11% |
2 |
2.38% |
| Willem de Bruijn |
7 |
0.97% |
1 |
1.19% |
| Octavian Purdila |
4 |
0.56% |
1 |
1.19% |
| Hideaki Yoshifuji / 吉藤英明 |
4 |
0.56% |
1 |
1.19% |
| Arnaldo Carvalho de Melo |
3 |
0.42% |
1 |
1.19% |
| Tom Gundersen |
2 |
0.28% |
1 |
1.19% |
| Phil Sutter |
2 |
0.28% |
1 |
1.19% |
| Thomas Gleixner |
2 |
0.28% |
1 |
1.19% |
| Mahesh Bandewar |
2 |
0.28% |
1 |
1.19% |
| Adrian Bunk |
2 |
0.28% |
2 |
2.38% |
| Krishna Kumar |
2 |
0.28% |
1 |
1.19% |
| Marcelo Ricardo Leitner |
2 |
0.28% |
1 |
1.19% |
| Daniel Borkmann |
1 |
0.14% |
1 |
1.19% |
| Denis V. Lunev |
1 |
0.14% |
1 |
1.19% |
| Christoph Lameter |
1 |
0.14% |
1 |
1.19% |
| Jeff Garzik |
1 |
0.14% |
1 |
1.19% |
| Patrick McHardy |
1 |
0.14% |
1 |
1.19% |
| Emil Medve |
1 |
0.14% |
1 |
1.19% |
| Kamezawa Hiroyuki |
1 |
0.14% |
1 |
1.19% |
| Ralf Baechle |
1 |
0.14% |
1 |
1.19% |
| Tom Herbert |
1 |
0.14% |
1 |
1.19% |
| Julian Wiedmann |
1 |
0.14% |
1 |
1.19% |
| Chuck Ebbert |
1 |
0.14% |
1 |
1.19% |
| Rusty Russell |
1 |
0.14% |
1 |
1.19% |
| Total |
720 |
|
84 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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.
*/
#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 <linux/uaccess.h>
#include <linux/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 <linux/net_tstamp.h>
#include <net/net_namespace.h>
#include <linux/u64_stats_sync.h>
/* 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_tx_timestamp(skb);
/* do not fool net_timestamp_check() with various clock bases */
skb->tstamp = 0;
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;
}
static void 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;
}
static u32 always_on(struct net_device *dev)
{
return 1;
}
static const struct ethtool_ops loopback_ethtool_ops = {
.get_link = always_on,
.get_ts_info = ethtool_op_get_ts_info,
};
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;
}
static void loopback_dev_free(struct net_device *dev)
{
dev_net(dev)->loopback_dev = NULL;
free_percpu(dev->lstats);
}
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->min_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_GSO_SOFTWARE;
dev->features = NETIF_F_SG | NETIF_F_FRAGLIST
| NETIF_F_GSO_SOFTWARE
| 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->needs_free_netdev = true;
dev->priv_destructor = loopback_dev_free;
}
/* 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;
}
/* Registered in net/core/dev.c */
struct pernet_operations __net_initdata loopback_net_ops = {
.init = loopback_net_init,
};