Release 4.11 net/ipv6/anycast.c

/*
 *      Anycast support for IPv6
 *      Linux INET6 implementation
 *
 *      Authors:
 *      David L Stevens (dlstevens@us.ibm.com)
 *
 *      based heavily on net/ipv6/mcast.c
 *
 *      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/capability.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/random.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/route.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>

#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/if_inet6.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>

#include <net/checksum.h>

static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr);

/*
 *      socket join an anycast group
 */



int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct net_device *dev = NULL;
	struct inet6_dev *idev;
	struct ipv6_ac_socklist *pac;
	struct net *net = sock_net(sk);
	int	ishost = !net->ipv6.devconf_all->forwarding;
	int	err = 0;

	ASSERT_RTNL();

	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
		return -EPERM;
	if (ipv6_addr_is_multicast(addr))
		return -EINVAL;
	if (ipv6_chk_addr(net, addr, NULL, 0))
		return -EINVAL;

	pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL);
	if (!pac)
		return -ENOMEM;
	pac->acl_next = NULL;
	pac->acl_addr = *addr;

	if (ifindex == 0) {
		struct rt6_info *rt;

		rt = rt6_lookup(net, addr, NULL, 0, 0);
		if (rt) {
			dev = rt->dst.dev;
			ip6_rt_put(rt);
		} else if (ishost) {
			err = -EADDRNOTAVAIL;
			goto error;
		} else {
			/* router, no matching interface: just pick one */
			dev = __dev_get_by_flags(net, IFF_UP,
						 IFF_UP | IFF_LOOPBACK);
		}
	} else
		dev = __dev_get_by_index(net, ifindex);

	if (!dev) {
		err = -ENODEV;
		goto error;
	}

	idev = __in6_dev_get(dev);
	if (!idev) {
		if (ifindex)
			err = -ENODEV;
		else
			err = -EADDRNOTAVAIL;
		goto error;
	}
	/* reset ishost, now that we have a specific device */
	ishost = !idev->cnf.forwarding;

	pac->acl_ifindex = dev->ifindex;

	/* XXX
         * For hosts, allow link-local or matching prefix anycasts.
         * This obviates the need for propagating anycast routes while
         * still allowing some non-router anycast participation.
         */
	if (!ipv6_chk_prefix(addr, dev)) {
		if (ishost)
			err = -EADDRNOTAVAIL;
		if (err)
			goto error;
	}

	err = __ipv6_dev_ac_inc(idev, addr);
	if (!err) {
		pac->acl_next = np->ipv6_ac_list;
		np->ipv6_ac_list = pac;
		pac = NULL;
	}

error:
	if (pac)
		sock_kfree_s(sk, pac, sizeof(*pac));
	return err;
}

Contributors
Person
Tokens
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Commits
CommitProp
David L Stevens
269
67.93%
1
4.76%
David S. Miller
41
10.35%
2
9.52%
Alexey Kuznetsov
25
6.31%
1
4.76%
Eric Dumazet
17
4.29%
2
9.52%
Daniel Lezcano
16
4.04%
3
14.29%
Hideaki Yoshifuji / 吉藤英明
7
1.77%
3
14.29%
Eric W. Biedermann
7
1.77%
2
9.52%
Américo Wang
5
1.26%
3
14.29%
Marcelo Ricardo Leitner
3
0.76%
1
4.76%
Alexey Dobriyan
2
0.51%
1
4.76%
Ian Morris
2
0.51%
1
4.76%
Ville Nuorvala
2
0.51%
1
4.76%
Total
396
100.00%
21
100.00%

/*
 *      socket leave an anycast group
 */


int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct net_device *dev;
	struct ipv6_ac_socklist *pac, *prev_pac;
	struct net *net = sock_net(sk);

	ASSERT_RTNL();

	prev_pac = NULL;
	for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) {
		if ((ifindex == 0 || pac->acl_ifindex == ifindex) &&
		     ipv6_addr_equal(&pac->acl_addr, addr))
			break;
		prev_pac = pac;
	}
	if (!pac)
		return -ENOENT;
	if (prev_pac)
		prev_pac->acl_next = pac->acl_next;
	else
		np->ipv6_ac_list = pac->acl_next;

	dev = __dev_get_by_index(net, pac->acl_ifindex);
	if (dev)
		ipv6_dev_ac_dec(dev, &pac->acl_addr);

	sock_kfree_s(sk, pac, sizeof(*pac));
	return 0;
}

Contributors
Person
Tokens
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CommitProp
David L Stevens
159
89.83%
1
11.11%
Daniel Lezcano
11
6.21%
1
11.11%
Américo Wang
2
1.13%
2
22.22%
Eric W. Biedermann
1
0.56%
1
11.11%
Hideaki Yoshifuji / 吉藤英明
1
0.56%
1
11.11%
Eric Dumazet
1
0.56%
1
11.11%
Al Viro
1
0.56%
1
11.11%
Marcelo Ricardo Leitner
1
0.56%
1
11.11%
Total
177
100.00%
9
100.00%



void ipv6_sock_ac_close(struct sock *sk)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct net_device *dev = NULL;
	struct ipv6_ac_socklist *pac;
	struct net *net = sock_net(sk);
	int	prev_index;

	if (!np->ipv6_ac_list)
		return;

	rtnl_lock();
	pac = np->ipv6_ac_list;
	np->ipv6_ac_list = NULL;

	prev_index = 0;
	while (pac) {
		struct ipv6_ac_socklist *next = pac->acl_next;

		if (pac->acl_ifindex != prev_index) {
			dev = __dev_get_by_index(net, pac->acl_ifindex);
			prev_index = pac->acl_ifindex;
		}
		if (dev)
			ipv6_dev_ac_dec(dev, &pac->acl_addr);
		sock_kfree_s(sk, pac, sizeof(*pac));
		pac = next;
	}
	rtnl_unlock();
}

Contributors
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Tokens
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David L Stevens
120
81.08%
1
12.50%
Daniel Lezcano
11
7.43%
1
12.50%
Eric Dumazet
8
5.41%
1
12.50%
Américo Wang
3
2.03%
2
25.00%
Sabrina Dubroca
3
2.03%
1
12.50%
Al Viro
2
1.35%
1
12.50%
Eric W. Biedermann
1
0.68%
1
12.50%
Total
148
100.00%
8
100.00%



static void aca_get(struct ifacaddr6 *aca)
{
	atomic_inc(&aca->aca_refcnt);
}

Contributors
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Américo Wang
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%



static void aca_put(struct ifacaddr6 *ac)
{
	if (atomic_dec_and_test(&ac->aca_refcnt)) {
		in6_dev_put(ac->aca_idev);
		dst_release(&ac->aca_rt->dst);
		kfree(ac);
	}
}

Contributors
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Tokens
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CommitProp
David L Stevens
35
77.78%
1
50.00%
Hideaki Yoshifuji / 吉藤英明
10
22.22%
1
50.00%
Total
45
100.00%
2
100.00%



static struct ifacaddr6 *aca_alloc(struct rt6_info *rt,
				   const struct in6_addr *addr)
{
	struct inet6_dev *idev = rt->rt6i_idev;
	struct ifacaddr6 *aca;

	aca = kzalloc(sizeof(*aca), GFP_ATOMIC);
	if (!aca)
		return NULL;

	aca->aca_addr = *addr;
	in6_dev_hold(idev);
	aca->aca_idev = idev;
	aca->aca_rt = rt;
	aca->aca_users = 1;
	/* aca_tstamp should be updated upon changes */
	aca->aca_cstamp = aca->aca_tstamp = jiffies;
	atomic_set(&aca->aca_refcnt, 1);

	return aca;
}

Contributors
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CommitProp
Américo Wang
107
99.07%
1
50.00%
Ian Morris
1
0.93%
1
50.00%
Total
108
100.00%
2
100.00%

/*
 *      device anycast group inc (add if not found)
 */


int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
{
	struct ifacaddr6 *aca;
	struct rt6_info *rt;
	int err;

	ASSERT_RTNL();

	write_lock_bh(&idev->lock);
	if (idev->dead) {
		err = -ENODEV;
		goto out;
	}

	for (aca = idev->ac_list; aca; aca = aca->aca_next) {
		if (ipv6_addr_equal(&aca->aca_addr, addr)) {
			aca->aca_users++;
			err = 0;
			goto out;
		}
	}

	rt = addrconf_dst_alloc(idev, addr, true);
	if (IS_ERR(rt)) {
		err = PTR_ERR(rt);
		goto out;
	}
	aca = aca_alloc(rt, addr);
	if (!aca) {
		ip6_rt_put(rt);
		err = -ENOMEM;
		goto out;
	}

	aca->aca_next = idev->ac_list;
	idev->ac_list = aca;

	/* Hold this for addrconf_join_solict() below before we unlock,
         * it is already exposed via idev->ac_list.
         */
	aca_get(aca);
	write_unlock_bh(&idev->lock);

	ip6_ins_rt(rt);

	addrconf_join_solict(idev->dev, &aca->aca_addr);

	aca_put(aca);
	return 0;
out:
	write_unlock_bh(&idev->lock);
	return err;
}

Contributors
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CommitProp
David L Stevens
128
56.89%
1
10.00%
Hideaki Yoshifuji / 吉藤英明
60
26.67%
2
20.00%
Américo Wang
30
13.33%
2
20.00%
Sabrina Dubroca
3
1.33%
1
10.00%
Andrew Morton
1
0.44%
1
10.00%
Ian Morris
1
0.44%
1
10.00%
Eric Dumazet
1
0.44%
1
10.00%
David S. Miller
1
0.44%
1
10.00%
Total
225
100.00%
10
100.00%

/*
 *      device anycast group decrement
 */


int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr)
{
	struct ifacaddr6 *aca, *prev_aca;

	ASSERT_RTNL();

	write_lock_bh(&idev->lock);
	prev_aca = NULL;
	for (aca = idev->ac_list; aca; aca = aca->aca_next) {
		if (ipv6_addr_equal(&aca->aca_addr, addr))
			break;
		prev_aca = aca;
	}
	if (!aca) {
		write_unlock_bh(&idev->lock);
		return -ENOENT;
	}
	if (--aca->aca_users > 0) {
		write_unlock_bh(&idev->lock);
		return 0;
	}
	if (prev_aca)
		prev_aca->aca_next = aca->aca_next;
	else
		idev->ac_list = aca->aca_next;
	write_unlock_bh(&idev->lock);
	addrconf_leave_solict(idev, &aca->aca_addr);

	dst_hold(&aca->aca_rt->dst);
	ip6_del_rt(aca->aca_rt);

	aca_put(aca);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David L Stevens
153
85.47%
1
12.50%
Hideaki Yoshifuji / 吉藤英明
21
11.73%
4
50.00%
Sabrina Dubroca
3
1.68%
1
12.50%
Eric Dumazet
1
0.56%
1
12.50%
Al Viro
1
0.56%
1
12.50%
Total
179
100.00%
8
100.00%

/* called with rtnl_lock() */


static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr)
{
	struct inet6_dev *idev = __in6_dev_get(dev);

	if (!idev)
		return -ENODEV;
	return __ipv6_dev_ac_dec(idev, addr);
}

Contributors
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Hideaki Yoshifuji / 吉藤英明
37
84.09%
1
16.67%
Eric Dumazet
3
6.82%
2
33.33%
David L Stevens
2
4.55%
1
16.67%
Ian Morris
1
2.27%
1
16.67%
Adrian Bunk
1
2.27%
1
16.67%
Total
44
100.00%
6
100.00%



void ipv6_ac_destroy_dev(struct inet6_dev *idev)
{
	struct ifacaddr6 *aca;

	write_lock_bh(&idev->lock);
	while ((aca = idev->ac_list) != NULL) {
		idev->ac_list = aca->aca_next;
		write_unlock_bh(&idev->lock);

		addrconf_leave_solict(idev, &aca->aca_addr);

		dst_hold(&aca->aca_rt->dst);
		ip6_del_rt(aca->aca_rt);

		aca_put(aca);

		write_lock_bh(&idev->lock);
	}
	write_unlock_bh(&idev->lock);
}

Contributors
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Sabrina Dubroca
101
100.00%
1
100.00%
Total
101
100.00%
1
100.00%

/*
 *      check if the interface has this anycast address
 *      called with rcu_read_lock()
 */


static bool ipv6_chk_acast_dev(struct net_device *dev, const struct in6_addr *addr)
{
	struct inet6_dev *idev;
	struct ifacaddr6 *aca;

	idev = __in6_dev_get(dev);
	if (idev) {
		read_lock_bh(&idev->lock);
		for (aca = idev->ac_list; aca; aca = aca->aca_next)
			if (ipv6_addr_equal(&aca->aca_addr, addr))
				break;
		read_unlock_bh(&idev->lock);
		return aca != NULL;
	}
	return false;
}

Contributors
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David L Stevens
87
93.55%
1
16.67%
Eric Dumazet
4
4.30%
3
50.00%
Stephen Hemminger
1
1.08%
1
16.67%
Hideaki Yoshifuji / 吉藤英明
1
1.08%
1
16.67%
Total
93
100.00%
6
100.00%

/*
 *      check if given interface (or any, if dev==0) has this anycast address
 */


bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
			 const struct in6_addr *addr)
{
	bool found = false;

	rcu_read_lock();
	if (dev)
		found = ipv6_chk_acast_dev(dev, addr);
	else
		for_each_netdev_rcu(net, dev)
			if (ipv6_chk_acast_dev(dev, addr)) {
				found = true;
				break;
			}
	rcu_read_unlock();
	return found;
}

Contributors
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Tokens
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Commits
CommitProp
David L Stevens
38
53.52%
1
12.50%
Eric Dumazet
14
19.72%
4
50.00%
Pavel Emelyanov
12
16.90%
1
12.50%
Daniel Lezcano
6
8.45%
1
12.50%
Eric W. Biedermann
1
1.41%
1
12.50%
Total
71
100.00%
8
100.00%

/*      check if this anycast address is link-local on given interface or
 *      is global
 */


bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
			     const struct in6_addr *addr)
{
	return ipv6_chk_acast_addr(net,
				   (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL ?
				    dev : NULL),
				   addr);
}

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François-Xavier Le Bail
42
100.00%
1
100.00%
Total
42
100.00%
1
100.00%

#ifdef CONFIG_PROC_FS

struct ac6_iter_state {
	
struct seq_net_private p;
	
struct net_device *dev;
	
struct inet6_dev *idev;
};


#define ac6_seq_private(seq)	((struct ac6_iter_state *)(seq)->private)



static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq)
{
	struct ifacaddr6 *im = NULL;
	struct ac6_iter_state *state = ac6_seq_private(seq);
	struct net *net = seq_file_net(seq);

	state->idev = NULL;
	for_each_netdev_rcu(net, state->dev) {
		struct inet6_dev *idev;
		idev = __in6_dev_get(state->dev);
		if (!idev)
			continue;
		read_lock_bh(&idev->lock);
		im = idev->ac_list;
		if (im) {
			state->idev = idev;
			break;
		}
		read_unlock_bh(&idev->lock);
	}
	return im;
}

Contributors
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Tokens
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CommitProp
David L Stevens
49
43.36%
1
16.67%
Hideaki Yoshifuji / 吉藤英明
46
40.71%
1
16.67%
Daniel Lezcano
11
9.73%
1
16.67%
Pavel Emelyanov
4
3.54%
1
16.67%
Eric Dumazet
2
1.77%
1
16.67%
Eric W. Biedermann
1
0.88%
1
16.67%
Total
113
100.00%
6
100.00%



static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im)
{
	struct ac6_iter_state *state = ac6_seq_private(seq);

	im = im->aca_next;
	while (!im) {
		if (likely(state->idev != NULL))
			read_unlock_bh(&state->idev->lock);

		state->dev = next_net_device_rcu(state->dev);
		if (!state->dev) {
			state->idev = NULL;
			break;
		}
		state->idev = __in6_dev_get(state->dev);
		if (!state->idev)
			continue;
		read_lock_bh(&state->idev->lock);
		im = state->idev->ac_list;
	}
	return im;
}

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Hideaki Yoshifuji / 吉藤英明
95
73.64%
1
25.00%
David L Stevens
30
23.26%
1
25.00%
Pavel Emelyanov
2
1.55%
1
25.00%
Eric Dumazet
2
1.55%
1
25.00%
Total
129
100.00%
4
100.00%



static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos)
{
	struct ifacaddr6 *im = ac6_get_first(seq);
	if (im)
		while (pos && (im = ac6_get_next(seq, im)) != NULL)
			--pos;
	return pos ? NULL : im;
}

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Hideaki Yoshifuji / 吉藤英明
57
100.00%
1
100.00%
Total
57
100.00%
1
100.00%


static void *ac6_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires
(RCU)
{
	rcu_read_lock();
	return ac6_get_idx(seq, *pos);
}

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Hideaki Yoshifuji / 吉藤英明
26
81.25%
1
33.33%
Eric Dumazet
6
18.75%
2
66.67%
Total
32
100.00%
3
100.00%



static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct ifacaddr6 *im = ac6_get_next(seq, v);

	++*pos;
	return im;
}

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Hideaki Yoshifuji / 吉藤英明
37
94.87%
1
50.00%
Eric Dumazet
2
5.13%
1
50.00%
Total
39
100.00%
2
100.00%


static void ac6_seq_stop(struct seq_file *seq, void *v)
	__releases
(RCU)
{
	struct ac6_iter_state *state = ac6_seq_private(seq);

	if (likely(state->idev != NULL)) {
		read_unlock_bh(&state->idev->lock);
		state->idev = NULL;
	}
	rcu_read_unlock();
}

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Hideaki Yoshifuji / 吉藤英明
53
86.89%
1
33.33%
Eric Dumazet
8
13.11%
2
66.67%
Total
61
100.00%
3
100.00%



static int ac6_seq_show(struct seq_file *seq, void *v)
{
	struct ifacaddr6 *im = (struct ifacaddr6 *)v;
	struct ac6_iter_state *state = ac6_seq_private(seq);

	seq_printf(seq, "%-4d %-15s %pi6 %5d\n",
		   state->dev->ifindex, state->dev->name,
		   &im->aca_addr, im->aca_users);
	return 0;
}

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Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
66
97.06%
1
33.33%
Harvey Harrison
2
2.94%
2
66.67%
Total
68
100.00%
3
100.00%


static const struct seq_operations ac6_seq_ops = {
	.start	=	ac6_seq_start,
	.next	=	ac6_seq_next,
	.stop	=	ac6_seq_stop,
	.show	=	ac6_seq_show,
};



static int ac6_seq_open(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &ac6_seq_ops,
			    sizeof(struct ac6_iter_state));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
23
69.70%
1
33.33%
Pavel Emelyanov
7
21.21%
1
33.33%
Daniel Lezcano
3
9.09%
1
33.33%
Total
33
100.00%
3
100.00%


static const struct file_operations ac6_seq_fops = {
	.owner		=	THIS_MODULE,
	.open		=	ac6_seq_open,
	.read		=	seq_read,
	.llseek		=	seq_lseek,
	.release	=	seq_release_net,
};



int __net_init ac6_proc_init(struct net *net)
{
	if (!proc_create("anycast6", S_IRUGO, net->proc_net, &ac6_seq_fops))
		return -ENOMEM;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
25
71.43%
2
40.00%
Gao Feng
5
14.29%
1
20.00%
Daniel Lezcano
4
11.43%
1
20.00%
Alexey Dobriyan
1
2.86%
1
20.00%
Total
35
100.00%
5
100.00%



void ac6_proc_exit(struct net *net)
{
	remove_proc_entry("anycast6", net->proc_net);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
9
47.37%
1
25.00%
Gao Feng
5
26.32%
1
25.00%
Daniel Lezcano
4
21.05%
1
25.00%
David L Stevens
1
5.26%
1
25.00%
Total
19
100.00%
4
100.00%

#endif

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
David L Stevens
1151
47.33%
1
1.79%
Hideaki Yoshifuji / 吉藤英明
657
27.01%
11
19.64%
Américo Wang
167
6.87%
5
8.93%
Sabrina Dubroca
110
4.52%
2
3.57%
Eric Dumazet
71
2.92%
7
12.50%
Daniel Lezcano
71
2.92%
3
5.36%
François-Xavier Le Bail
43
1.77%
1
1.79%
David S. Miller
42
1.73%
3
5.36%
Alexey Kuznetsov
25
1.03%
1
1.79%
Pavel Emelyanov
25
1.03%
2
3.57%
Adrian Bunk
16
0.66%
1
1.79%
Eric W. Biedermann
14
0.58%
3
5.36%
Gao Feng
10
0.41%
2
3.57%
Ian Morris
5
0.21%
1
1.79%
Marcelo Ricardo Leitner
4
0.16%
1
1.79%
Al Viro
4
0.16%
1
1.79%
Randy Dunlap
3
0.12%
1
1.79%
Tejun Heo
3
0.12%
1
1.79%
Alexey Dobriyan
3
0.12%
2
3.57%
Harvey Harrison
2
0.08%
2
3.57%
Ville Nuorvala
2
0.08%
1
1.79%
Philippe De Muyter
1
0.04%
1
1.79%
Stephen Hemminger
1
0.04%
1
1.79%
Arjan van de Ven
1
0.04%
1
1.79%
Andrew Morton
1
0.04%
1
1.79%
Total
2432
100.00%
56
100.00%
Directory: net/ipv6

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