cregit-Linux how code gets into the kernel

Release 4.18 net/ipv6/anycast.c

Directory: net/ipv6
/*
 *      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 (ifindex)
		dev = __dev_get_by_index(net, ifindex);

	if (ipv6_chk_addr_and_flags(net, addr, dev, true, 0, IFA_F_TENTATIVE))
		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, NULL, 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);
		}
	}

	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
PersonTokensPropCommitsCommitProp
David L Stevens26364.94%14.35%


David S. Miller409.88%28.70%


Alexey Kuznetsov235.68%14.35%


David Ahern215.19%28.70%


Eric Dumazet174.20%28.70%


Daniel Lezcano153.70%313.04%


Hideaki Yoshifuji / 吉藤英明71.73%313.04%


Eric W. Biedermann61.48%28.70%


Américo Wang40.99%313.04%


Marcelo Ricardo Leitner30.74%14.35%


Alexey Dobriyan20.49%14.35%


Ville Nuorvala20.49%14.35%


Ian Morris20.49%14.35%


Total405100.00%23100.00%



/*
 *      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
PersonTokensPropCommitsCommitProp
David L Stevens15989.83%111.11%


Daniel Lezcano116.21%111.11%


Américo Wang21.13%222.22%


Hideaki Yoshifuji / 吉藤英明10.56%111.11%


Eric Dumazet10.56%111.11%


Eric W. Biedermann10.56%111.11%


Marcelo Ricardo Leitner10.56%111.11%


Al Viro10.56%111.11%


Total177100.00%9100.00%






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
PersonTokensPropCommitsCommitProp
David L Stevens12081.08%112.50%


Daniel Lezcano117.43%112.50%


Eric Dumazet85.41%112.50%


Américo Wang32.03%225.00%


Sabrina Dubroca32.03%112.50%


Al Viro21.35%112.50%


Eric W. Biedermann10.68%112.50%


Total148100.00%8100.00%






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


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang1894.74%150.00%


Elena Reshetova15.26%150.00%


Total19100.00%2100.00%






static void aca_put(struct ifacaddr6 *ac)
{
	if (refcount_dec_and_test(&ac->aca_refcnt)) {
		fib6_info_release(ac->aca_rt);
		kfree(ac);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
David L Stevens3085.71%125.00%


Hideaki Yoshifuji / 吉藤英明38.57%125.00%


David Ahern12.86%125.00%


Elena Reshetova12.86%125.00%


Total35100.00%4100.00%






static struct ifacaddr6 *aca_alloc(struct fib6_info *f6i,
				   const struct in6_addr *addr)
{
	struct ifacaddr6 *aca;

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

	aca->aca_addr = *addr;
	fib6_info_hold(f6i);
	aca->aca_rt = f6i;
	aca->aca_users = 1;
	/* aca_tstamp should be updated upon changes */
	aca->aca_cstamp = aca->aca_tstamp = jiffies;
	refcount_set(&aca->aca_refcnt, 1);

	return aca;
}


Contributors
PersonTokensPropCommitsCommitProp
Américo Wang8692.47%116.67%


David Ahern55.38%350.00%


Elena Reshetova11.08%116.67%


Ian Morris11.08%116.67%


Total93100.00%6100.00%



/*
 *      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 fib6_info *f6i;
	struct net *net;
	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;
		}
	}

	net = dev_net(idev->dev);
	f6i = addrconf_f6i_alloc(net, idev, addr, true, GFP_ATOMIC);
	if (IS_ERR(f6i)) {
		err = PTR_ERR(f6i);
		goto out;
	}
	aca = aca_alloc(f6i, addr);
	if (!aca) {
		fib6_info_release(f6i);
		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(net, f6i);

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

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


Contributors
PersonTokensPropCommitsCommitProp
David L Stevens12952.65%16.25%


Hideaki Yoshifuji / 吉藤英明5522.45%212.50%


Américo Wang2711.02%212.50%


David Ahern2610.61%531.25%


Sabrina Dubroca31.22%16.25%


David S. Miller10.41%16.25%


Ian Morris10.41%16.25%


Andrew Morton10.41%16.25%


Eric Dumazet10.41%16.25%


Alexey Dobriyan10.41%16.25%


Total245100.00%16100.00%



/*
 *      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);

	ip6_del_rt(dev_net(idev->dev), aca->aca_rt);

	aca_put(aca);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
David L Stevens15085.23%111.11%


Hideaki Yoshifuji / 吉藤英明169.09%444.44%


David Ahern52.84%111.11%


Sabrina Dubroca31.70%111.11%


Al Viro10.57%111.11%


Eric Dumazet10.57%111.11%


Total176100.00%9100.00%



/* 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
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明3784.09%116.67%


Eric Dumazet36.82%233.33%


David L Stevens24.55%116.67%


Adrian Bunk12.27%116.67%


Ian Morris12.27%116.67%


Total44100.00%6100.00%






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);

		ip6_del_rt(dev_net(idev->dev), aca->aca_rt);

		aca_put(aca);

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


Contributors
PersonTokensPropCommitsCommitProp
Sabrina Dubroca9394.90%150.00%


David Ahern55.10%150.00%


Total98100.00%2100.00%



/*
 *      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
PersonTokensPropCommitsCommitProp
David L Stevens8793.55%116.67%


Eric Dumazet44.30%350.00%


Hideaki Yoshifuji / 吉藤英明11.08%116.67%


Stephen Hemminger11.08%116.67%


Total93100.00%6100.00%



/*
 *      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
PersonTokensPropCommitsCommitProp
David L Stevens3853.52%112.50%


Eric Dumazet1419.72%450.00%


Pavel Emelyanov1216.90%112.50%


Daniel Lezcano68.45%112.50%


Eric W. Biedermann11.41%112.50%


Total71100.00%8100.00%



/*      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);
}


Contributors
PersonTokensPropCommitsCommitProp
François-Xavier Le Bail42100.00%1100.00%


Total42100.00%1100.00%



#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
PersonTokensPropCommitsCommitProp
David L Stevens4842.48%116.67%


Hideaki Yoshifuji / 吉藤英明4741.59%116.67%


Daniel Lezcano119.73%116.67%


Pavel Emelyanov43.54%116.67%


Eric Dumazet21.77%116.67%


Eric W. Biedermann10.88%116.67%


Total113100.00%6100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明9573.64%125.00%


David L Stevens3023.26%125.00%


Eric Dumazet21.55%125.00%


Pavel Emelyanov21.55%125.00%


Total129100.00%4100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明57100.00%1100.00%


Total57100.00%1100.00%






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


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明2681.25%133.33%


Eric Dumazet618.75%266.67%


Total32100.00%3100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明3794.87%150.00%


Eric Dumazet25.13%150.00%


Total39100.00%2100.00%






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();
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明5386.89%133.33%


Eric Dumazet813.11%266.67%


Total61100.00%3100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明6697.06%133.33%


Harvey Harrison22.94%266.67%


Total68100.00%3100.00%




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




int __net_init ac6_proc_init(struct net *net)
{
	if (!proc_create_net("anycast6", 0444, net->proc_net, &ac6_seq_ops,
			sizeof(struct ac6_iter_state)))
		return -ENOMEM;

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明2356.10%228.57%


Christoph Hellwig819.51%114.29%


Daniel Lezcano49.76%114.29%


Gao Feng49.76%114.29%


Joe Perches12.44%114.29%


Alexey Dobriyan12.44%114.29%


Total41100.00%7100.00%






void ac6_proc_exit(struct net *net)
{
	remove_proc_entry("anycast6", net->proc_net);
}

Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明947.37%125.00%


Gao Feng526.32%125.00%


Daniel Lezcano421.05%125.00%


David L Stevens15.26%125.00%


Total19100.00%4100.00%



#endif

Overall Contributors
PersonTokensPropCommitsCommitProp
David L Stevens113848.02%11.54%


Hideaki Yoshifuji / 吉藤英明58424.64%1116.92%


Américo Wang1415.95%57.69%


Sabrina Dubroca1024.30%23.08%


Eric Dumazet713.00%710.77%


Daniel Lezcano662.78%34.62%


David Ahern632.66%812.31%


François-Xavier Le Bail431.81%11.54%


David S. Miller411.73%34.62%


Alexey Kuznetsov230.97%11.54%


Pavel Emelyanov180.76%11.54%


Adrian Bunk160.68%11.54%


Eric W. Biedermann130.55%34.62%


Gao Feng90.38%23.08%


Christoph Hellwig80.34%11.54%


Ian Morris50.21%11.54%


Marcelo Ricardo Leitner40.17%11.54%


Al Viro40.17%11.54%


Alexey Dobriyan40.17%23.08%


Randy Dunlap30.13%11.54%


Elena Reshetova30.13%11.54%


Tejun Heo30.13%11.54%


Ville Nuorvala20.08%11.54%


Harvey Harrison20.08%23.08%


Joe Perches10.04%11.54%


Stephen Hemminger10.04%11.54%


Philippe De Muyter10.04%11.54%


Andrew Morton10.04%11.54%


Total2370100.00%65100.00%


Directory: net/ipv6



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