addrconf.c 132 KB
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/*
 *	IPv6 Address [auto]configuration
 *	Linux INET6 implementation
 *
 *	Authors:
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 *	Pedro Roque		<roque@di.fc.ul.pt>
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 *	Alexey Kuznetsov	<kuznet@ms2.inr.ac.ru>
 *
 *	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.
 */

/*
 *	Changes:
 *
 *	Janos Farkas			:	delete timer on ifdown
 *	<chexum@bankinf.banki.hu>
 *	Andi Kleen			:	kill double kfree on module
 *						unload.
 *	Maciej W. Rozycki		:	FDDI support
 *	sekiya@USAGI			:	Don't send too many RS
 *						packets.
 *	yoshfuji@USAGI			:       Fixed interval between DAD
 *						packets.
 *	YOSHIFUJI Hideaki @USAGI	:	improved accuracy of
 *						address validation timer.
 *	YOSHIFUJI Hideaki @USAGI	:	Privacy Extensions (RFC3041)
 *						support.
 *	Yuji SEKIYA @USAGI		:	Don't assign a same IPv6
 *						address on a same interface.
 *	YOSHIFUJI Hideaki @USAGI	:	ARCnet support
 *	YOSHIFUJI Hideaki @USAGI	:	convert /proc/net/if_inet6 to
 *						seq_file.
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 *	YOSHIFUJI Hideaki @USAGI	:	improved source address
 *						selection; consider scope,
 *						status etc.
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 */

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#define pr_fmt(fmt) "IPv6: " fmt

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#include <linux/errno.h>
#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
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#include <linux/if_addr.h>
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#include <linux/if_arp.h>
#include <linux/if_arcnet.h>
#include <linux/if_infiniband.h>
#include <linux/route.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
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#include <linux/slab.h>
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#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
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#include <linux/capability.h>
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#include <linux/delay.h>
#include <linux/notifier.h>
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#include <linux/string.h>
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#include <linux/hash.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
#include <net/snmp.h>

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#include <net/af_ieee802154.h>
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#include <net/firewire.h>
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#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/ndisc.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/tcp.h>
#include <net/ip.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <linux/if_tunnel.h>
#include <linux/rtnetlink.h>
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#include <linux/netconf.h>
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#include <linux/random.h>
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#include <linux/uaccess.h>
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#include <asm/unaligned.h>
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#include <linux/proc_fs.h>
#include <linux/seq_file.h>
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#include <linux/export.h>
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/* Set to 3 to get tracing... */
#define ACONF_DEBUG 2

#if ACONF_DEBUG >= 3
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#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
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#else
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#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
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#endif

#define	INFINITY_LIFE_TIME	0xFFFFFFFF
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static inline u32 cstamp_delta(unsigned long cstamp)
{
	return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
}
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#ifdef CONFIG_SYSCTL
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static int addrconf_sysctl_register(struct inet6_dev *idev);
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static void addrconf_sysctl_unregister(struct inet6_dev *idev);
#else
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static inline int addrconf_sysctl_register(struct inet6_dev *idev)
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{
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	return 0;
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}

static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
{
}
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#endif

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static void __ipv6_regen_rndid(struct inet6_dev *idev);
static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
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static void ipv6_regen_rndid(unsigned long data);

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static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
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static int ipv6_count_addresses(struct inet6_dev *idev);

/*
 *	Configured unicast address hash table
 */
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static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
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static DEFINE_SPINLOCK(addrconf_hash_lock);
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static void addrconf_verify(void);
static void addrconf_verify_rtnl(void);
static void addrconf_verify_work(struct work_struct *);
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static struct workqueue_struct *addrconf_wq;
static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
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static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);

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static void addrconf_type_change(struct net_device *dev,
				 unsigned long event);
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static int addrconf_ifdown(struct net_device *dev, int how);

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static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
						  int plen,
						  const struct net_device *dev,
						  u32 flags, u32 noflags);

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static void addrconf_dad_start(struct inet6_ifaddr *ifp);
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static void addrconf_dad_work(struct work_struct *w);
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static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
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static void addrconf_dad_run(struct inet6_dev *idev);
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static void addrconf_rs_timer(unsigned long data);
static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);

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static void inet6_prefix_notify(int event, struct inet6_dev *idev,
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				struct prefix_info *pinfo);
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static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
			       struct net_device *dev);
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static struct ipv6_devconf ipv6_devconf __read_mostly = {
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	.forwarding		= 0,
	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
	.mtu6			= IPV6_MIN_MTU,
	.accept_ra		= 1,
	.accept_redirects	= 1,
	.autoconf		= 1,
	.force_mld_version	= 0,
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	.mldv1_unsolicited_report_interval = 10 * HZ,
	.mldv2_unsolicited_report_interval = HZ,
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	.dad_transmits		= 1,
	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
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	.use_tempaddr		= 0,
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	.temp_valid_lft		= TEMP_VALID_LIFETIME,
	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
	.regen_max_retry	= REGEN_MAX_RETRY,
	.max_desync_factor	= MAX_DESYNC_FACTOR,
	.max_addresses		= IPV6_MAX_ADDRESSES,
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	.accept_ra_defrtr	= 1,
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	.accept_ra_from_local	= 0,
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	.accept_ra_pinfo	= 1,
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#ifdef CONFIG_IPV6_ROUTER_PREF
	.accept_ra_rtr_pref	= 1,
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	.rtr_probe_interval	= 60 * HZ,
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#ifdef CONFIG_IPV6_ROUTE_INFO
	.accept_ra_rt_info_max_plen = 0,
#endif
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#endif
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	.proxy_ndp		= 0,
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	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
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	.disable_ipv6		= 0,
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	.accept_dad		= 1,
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	.suppress_frag_ndisc	= 1,
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};

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static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
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	.forwarding		= 0,
	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
	.mtu6			= IPV6_MIN_MTU,
	.accept_ra		= 1,
	.accept_redirects	= 1,
	.autoconf		= 1,
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	.force_mld_version	= 0,
	.mldv1_unsolicited_report_interval = 10 * HZ,
	.mldv2_unsolicited_report_interval = HZ,
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	.dad_transmits		= 1,
	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
	.use_tempaddr		= 0,
	.temp_valid_lft		= TEMP_VALID_LIFETIME,
	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
	.regen_max_retry	= REGEN_MAX_RETRY,
	.max_desync_factor	= MAX_DESYNC_FACTOR,
	.max_addresses		= IPV6_MAX_ADDRESSES,
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	.accept_ra_defrtr	= 1,
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	.accept_ra_from_local	= 0,
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	.accept_ra_pinfo	= 1,
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#ifdef CONFIG_IPV6_ROUTER_PREF
	.accept_ra_rtr_pref	= 1,
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	.rtr_probe_interval	= 60 * HZ,
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#ifdef CONFIG_IPV6_ROUTE_INFO
	.accept_ra_rt_info_max_plen = 0,
#endif
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#endif
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	.proxy_ndp		= 0,
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	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
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	.disable_ipv6		= 0,
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	.accept_dad		= 1,
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	.suppress_frag_ndisc	= 1,
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};

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/* Check if a valid qdisc is available */
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static inline bool addrconf_qdisc_ok(const struct net_device *dev)
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{
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	return !qdisc_tx_is_noop(dev);
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}

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static void addrconf_del_rs_timer(struct inet6_dev *idev)
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{
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	if (del_timer(&idev->rs_timer))
		__in6_dev_put(idev);
}

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static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
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{
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	if (cancel_delayed_work(&ifp->dad_work))
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		__in6_ifa_put(ifp);
}

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static void addrconf_mod_rs_timer(struct inet6_dev *idev,
				  unsigned long when)
{
	if (!timer_pending(&idev->rs_timer))
		in6_dev_hold(idev);
	mod_timer(&idev->rs_timer, jiffies + when);
}
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static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
				   unsigned long delay)
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{
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	if (!delayed_work_pending(&ifp->dad_work))
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		in6_ifa_hold(ifp);
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	mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
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}

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static int snmp6_alloc_dev(struct inet6_dev *idev)
{
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	int i;

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	idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
	if (!idev->stats.ipv6)
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		goto err_ip;
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	for_each_possible_cpu(i) {
		struct ipstats_mib *addrconf_stats;
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		addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
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		u64_stats_init(&addrconf_stats->syncp);
	}


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	idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
					GFP_KERNEL);
	if (!idev->stats.icmpv6dev)
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		goto err_icmp;
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	idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
					   GFP_KERNEL);
	if (!idev->stats.icmpv6msgdev)
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		goto err_icmpmsg;
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	return 0;

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err_icmpmsg:
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	kfree(idev->stats.icmpv6dev);
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err_icmp:
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	free_percpu(idev->stats.ipv6);
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err_ip:
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	return -ENOMEM;
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}

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static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
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{
	struct inet6_dev *ndev;
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	int err = -ENOMEM;
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	ASSERT_RTNL();

	if (dev->mtu < IPV6_MIN_MTU)
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		return ERR_PTR(-EINVAL);
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	ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
	if (ndev == NULL)
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		return ERR_PTR(err);
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	rwlock_init(&ndev->lock);
	ndev->dev = dev;
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	INIT_LIST_HEAD(&ndev->addr_list);
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	setup_timer(&ndev->rs_timer, addrconf_rs_timer,
		    (unsigned long)ndev);
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	memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
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	ndev->cnf.mtu6 = dev->mtu;
	ndev->cnf.sysctl = NULL;
	ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
	if (ndev->nd_parms == NULL) {
		kfree(ndev);
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		return ERR_PTR(err);
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	}
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	if (ndev->cnf.forwarding)
		dev_disable_lro(dev);
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	/* We refer to the device */
	dev_hold(dev);
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	if (snmp6_alloc_dev(ndev) < 0) {
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		ADBG(KERN_WARNING
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			"%s: cannot allocate memory for statistics; dev=%s.\n",
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			__func__, dev->name);
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		neigh_parms_release(&nd_tbl, ndev->nd_parms);
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		dev_put(dev);
		kfree(ndev);
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		return ERR_PTR(err);
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	}
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	if (snmp6_register_dev(ndev) < 0) {
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		ADBG(KERN_WARNING
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			"%s: cannot create /proc/net/dev_snmp6/%s\n",
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			__func__, dev->name);
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		goto err_release;
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	}

	/* One reference from device.  We must do this before
	 * we invoke __ipv6_regen_rndid().
	 */
	in6_dev_hold(ndev);
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	if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
		ndev->cnf.accept_dad = -1;

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#if IS_ENABLED(CONFIG_IPV6_SIT)
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	if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
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		pr_info("%s: Disabled Multicast RS\n", dev->name);
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		ndev->cnf.rtr_solicits = 0;
	}
#endif

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	INIT_LIST_HEAD(&ndev->tempaddr_list);
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	setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
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	if ((dev->flags&IFF_LOOPBACK) ||
	    dev->type == ARPHRD_TUNNEL ||
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	    dev->type == ARPHRD_TUNNEL6 ||
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	    dev->type == ARPHRD_SIT ||
	    dev->type == ARPHRD_NONE) {
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		ndev->cnf.use_tempaddr = -1;
	} else {
		in6_dev_hold(ndev);
		ipv6_regen_rndid((unsigned long) ndev);
	}
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	ndev->token = in6addr_any;
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	if (netif_running(dev) && addrconf_qdisc_ok(dev))
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		ndev->if_flags |= IF_READY;

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	ipv6_mc_init_dev(ndev);
	ndev->tstamp = jiffies;
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	err = addrconf_sysctl_register(ndev);
	if (err) {
		ipv6_mc_destroy_dev(ndev);
		del_timer(&ndev->regen_timer);
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		snmp6_unregister_dev(ndev);
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		goto err_release;
	}
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	/* protected by rtnl_lock */
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	rcu_assign_pointer(dev->ip6_ptr, ndev);
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	/* Join interface-local all-node multicast group */
	ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);

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	/* Join all-node multicast group */
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	ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
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	/* Join all-router multicast group if forwarding is set */
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	if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
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		ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);

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	return ndev;
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err_release:
	neigh_parms_release(&nd_tbl, ndev->nd_parms);
	ndev->dead = 1;
	in6_dev_finish_destroy(ndev);
	return ERR_PTR(err);
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}

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static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
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{
	struct inet6_dev *idev;

	ASSERT_RTNL();

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	idev = __in6_dev_get(dev);
	if (!idev) {
		idev = ipv6_add_dev(dev);
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		if (IS_ERR(idev))
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			return NULL;
	}
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	if (dev->flags&IFF_UP)
		ipv6_mc_up(idev);
	return idev;
}

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static int inet6_netconf_msgsize_devconf(int type)
{
	int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
		    + nla_total_size(4);	/* NETCONFA_IFINDEX */

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	/* type -1 is used for ALL */
	if (type == -1 || type == NETCONFA_FORWARDING)
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		size += nla_total_size(4);
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#ifdef CONFIG_IPV6_MROUTE
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	if (type == -1 || type == NETCONFA_MC_FORWARDING)
		size += nla_total_size(4);
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#endif
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	if (type == -1 || type == NETCONFA_PROXY_NEIGH)
		size += nla_total_size(4);
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	return size;
}

static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
				      struct ipv6_devconf *devconf, u32 portid,
				      u32 seq, int event, unsigned int flags,
				      int type)
{
	struct nlmsghdr  *nlh;
	struct netconfmsg *ncm;

	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
			flags);
	if (nlh == NULL)
		return -EMSGSIZE;

	ncm = nlmsg_data(nlh);
	ncm->ncm_family = AF_INET6;

	if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
		goto nla_put_failure;

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	/* type -1 is used for ALL */
	if ((type == -1 || type == NETCONFA_FORWARDING) &&
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	    nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
		goto nla_put_failure;
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#ifdef CONFIG_IPV6_MROUTE
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	if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
	    nla_put_s32(skb, NETCONFA_MC_FORWARDING,
			devconf->mc_forwarding) < 0)
		goto nla_put_failure;
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#endif
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	if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
	    nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
		goto nla_put_failure;

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	return nlmsg_end(skb, nlh);

nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

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void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
				  struct ipv6_devconf *devconf)
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{
	struct sk_buff *skb;
	int err = -ENOBUFS;

	skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
	if (skb == NULL)
		goto errout;

	err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
					 RTM_NEWNETCONF, 0, type);
	if (err < 0) {
		/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
	return;
errout:
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	rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
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}

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static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
	[NETCONFA_IFINDEX]	= { .len = sizeof(int) },
	[NETCONFA_FORWARDING]	= { .len = sizeof(int) },
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	[NETCONFA_PROXY_NEIGH]	= { .len = sizeof(int) },
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};

static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
531
				     struct nlmsghdr *nlh)
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{
	struct net *net = sock_net(in_skb->sk);
	struct nlattr *tb[NETCONFA_MAX+1];
	struct netconfmsg *ncm;
	struct sk_buff *skb;
	struct ipv6_devconf *devconf;
	struct inet6_dev *in6_dev;
	struct net_device *dev;
	int ifindex;
	int err;

	err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
			  devconf_ipv6_policy);
	if (err < 0)
		goto errout;

	err = EINVAL;
	if (!tb[NETCONFA_IFINDEX])
		goto errout;

	ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
	switch (ifindex) {
	case NETCONFA_IFINDEX_ALL:
		devconf = net->ipv6.devconf_all;
		break;
	case NETCONFA_IFINDEX_DEFAULT:
		devconf = net->ipv6.devconf_dflt;
		break;
	default:
		dev = __dev_get_by_index(net, ifindex);
		if (dev == NULL)
			goto errout;
		in6_dev = __in6_dev_get(dev);
		if (in6_dev == NULL)
			goto errout;
		devconf = &in6_dev->cnf;
		break;
	}

	err = -ENOBUFS;
	skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
	if (skb == NULL)
		goto errout;

	err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
					 NETLINK_CB(in_skb).portid,
					 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
					 -1);
	if (err < 0) {
		/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
errout:
	return err;
}

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static int inet6_netconf_dump_devconf(struct sk_buff *skb,
				      struct netlink_callback *cb)
{
	struct net *net = sock_net(skb->sk);
	int h, s_h;
	int idx, s_idx;
	struct net_device *dev;
	struct inet6_dev *idev;
	struct hlist_head *head;

	s_h = cb->args[0];
	s_idx = idx = cb->args[1];

	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
		idx = 0;
		head = &net->dev_index_head[h];
		rcu_read_lock();
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		cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
			  net->dev_base_seq;
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		hlist_for_each_entry_rcu(dev, head, index_hlist) {
			if (idx < s_idx)
				goto cont;
			idev = __in6_dev_get(dev);
			if (!idev)
				goto cont;

			if (inet6_netconf_fill_devconf(skb, dev->ifindex,
						       &idev->cnf,
						       NETLINK_CB(cb->skb).portid,
						       cb->nlh->nlmsg_seq,
						       RTM_NEWNETCONF,
						       NLM_F_MULTI,
						       -1) <= 0) {
				rcu_read_unlock();
				goto done;
			}
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			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
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cont:
			idx++;
		}
		rcu_read_unlock();
	}
	if (h == NETDEV_HASHENTRIES) {
		if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
					       net->ipv6.devconf_all,
					       NETLINK_CB(cb->skb).portid,
					       cb->nlh->nlmsg_seq,
					       RTM_NEWNETCONF, NLM_F_MULTI,
					       -1) <= 0)
			goto done;
		else
			h++;
	}
	if (h == NETDEV_HASHENTRIES + 1) {
		if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
					       net->ipv6.devconf_dflt,
					       NETLINK_CB(cb->skb).portid,
					       cb->nlh->nlmsg_seq,
					       RTM_NEWNETCONF, NLM_F_MULTI,
					       -1) <= 0)
			goto done;
		else
			h++;
	}
done:
	cb->args[0] = h;
	cb->args[1] = idx;

	return skb->len;
}

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#ifdef CONFIG_SYSCTL
static void dev_forward_change(struct inet6_dev *idev)
{
	struct net_device *dev;
	struct inet6_ifaddr *ifa;

	if (!idev)
		return;
	dev = idev->dev;
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	if (idev->cnf.forwarding)
		dev_disable_lro(dev);
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	if (dev->flags & IFF_MULTICAST) {
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		if (idev->cnf.forwarding) {
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			ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
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			ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
			ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
		} else {
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			ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
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			ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
			ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
		}
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	}
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	list_for_each_entry(ifa, &idev->addr_list, if_list) {
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		if (ifa->flags&IFA_F_TENTATIVE)
			continue;
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		if (idev->cnf.forwarding)
			addrconf_join_anycast(ifa);
		else
			addrconf_leave_anycast(ifa);
	}
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	inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
				     dev->ifindex, &idev->cnf);
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}


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static void addrconf_forward_change(struct net *net, __s32 newf)
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{
	struct net_device *dev;
	struct inet6_dev *idev;

703
	for_each_netdev(net, dev) {
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		idev = __in6_dev_get(dev);
		if (idev) {
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			int changed = (!idev->cnf.forwarding) ^ (!newf);
			idev->cnf.forwarding = newf;
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			if (changed)
				dev_forward_change(idev);
		}
	}
}
713

714
static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
715
{
716
	struct net *net;
717 718 719 720
	int old;

	if (!rtnl_trylock())
		return restart_syscall();
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	net = (struct net *)table->extra2;
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	old = *p;
	*p = newf;
725

726
	if (p == &net->ipv6.devconf_dflt->forwarding) {
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		if ((!newf) ^ (!old))
			inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
						     NETCONFA_IFINDEX_DEFAULT,
						     net->ipv6.devconf_dflt);
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		rtnl_unlock();
		return 0;
733
	}
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	if (p == &net->ipv6.devconf_all->forwarding) {
		net->ipv6.devconf_dflt->forwarding = newf;
		addrconf_forward_change(net, newf);
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		if ((!newf) ^ (!old))
			inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
						     NETCONFA_IFINDEX_ALL,
						     net->ipv6.devconf_all);
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	} else if ((!newf) ^ (!old))
743
		dev_forward_change((struct inet6_dev *)table->extra1);
744
	rtnl_unlock();
745

746
	if (newf)
747
		rt6_purge_dflt_routers(net);
748
	return 1;
749
}
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#endif

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/* Nobody refers to this ifaddr, destroy it */
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void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
{
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	WARN_ON(!hlist_unhashed(&ifp->addr_lst));
756

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#ifdef NET_REFCNT_DEBUG
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	pr_debug("%s\n", __func__);
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#endif

	in6_dev_put(ifp->idev);

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	if (cancel_delayed_work(&ifp->dad_work))
		pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
			  ifp);
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	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
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		pr_warn("Freeing alive inet6 address %p\n", ifp);
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		return;
	}
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	ip6_rt_put(ifp->rt);
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	kfree_rcu(ifp, rcu);
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}

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static void
ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
{
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	struct list_head *p;
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	int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
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	/*
	 * Each device address list is sorted in order of scope -
	 * global before linklocal.
	 */
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	list_for_each(p, &idev->addr_list) {
		struct inet6_ifaddr *ifa
			= list_entry(p, struct inet6_ifaddr, if_list);
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		if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
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			break;
	}

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	list_add_tail(&ifp->if_list, p);
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}

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static u32 inet6_addr_hash(const struct in6_addr *addr)
797
{
798
	return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
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}

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/* On success it returns ifp with increased reference count */

static struct inet6_ifaddr *
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ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
	      const struct in6_addr *peer_addr, int pfxlen,
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	      int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
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{
	struct inet6_ifaddr *ifa = NULL;
	struct rt6_info *rt;
810
	unsigned int hash;
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	int err = 0;
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	int addr_type = ipv6_addr_type(addr);

	if (addr_type == IPV6_ADDR_ANY ||
	    addr_type & IPV6_ADDR_MULTICAST ||
	    (!(idev->dev->flags & IFF_LOOPBACK) &&
	     addr_type & IPV6_ADDR_LOOPBACK))
		return ERR_PTR(-EADDRNOTAVAIL);
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820
	rcu_read_lock_bh();
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	if (idev->dead) {
		err = -ENODEV;			/*XXX*/
		goto out2;
	}

826
	if (idev->cnf.disable_ipv6) {
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		err = -EACCES;
		goto out2;
	}

831
	spin_lock(&addrconf_hash_lock);
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	/* Ignore adding duplicate addresses on an interface */
834
	if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
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		ADBG("ipv6_add_addr: already assigned\n");
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		err = -EEXIST;
		goto out;
	}

840
	ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
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	if (ifa == NULL) {
843
		ADBG("ipv6_add_addr: malloc failed\n");
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		err = -ENOBUFS;
		goto out;
	}

848
	rt = addrconf_dst_alloc(idev, addr, false);
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	if (IS_ERR(rt)) {
		err = PTR_ERR(rt);
		goto out;
	}

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	neigh_parms_data_state_setall(idev->nd_parms);

856
	ifa->addr = *addr;
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	if (peer_addr)
		ifa->peer_addr = *peer_addr;
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	spin_lock_init(&ifa->lock);
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	spin_lock_init(&ifa->state_lock);
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	INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
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	INIT_HLIST_NODE(&ifa->addr_lst);
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	ifa->scope = scope;
	ifa->prefix_len = pfxlen;
	ifa->flags = flags | IFA_F_TENTATIVE;
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	ifa->valid_lft = valid_lft;
	ifa->prefered_lft = prefered_lft;
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	ifa->cstamp = ifa->tstamp = jiffies;
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	ifa->tokenized = false;
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	ifa->rt = rt;

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	ifa->idev = idev;
	in6_dev_hold(idev);
	/* For caller */
	in6_ifa_hold(ifa);

	/* Add to big hash table */
880
	hash = inet6_addr_hash(addr);
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	hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
	spin_unlock(&addrconf_hash_lock);
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	write_lock(&idev->lock);
	/* Add to inet6_dev unicast addr list. */
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	ipv6_link_dev_addr(idev, ifa);
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	if (ifa->flags&IFA_F_TEMPORARY) {
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		list_add(&ifa->tmp_list, &idev->tempaddr_list);
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		in6_ifa_hold(ifa);
	}

	in6_ifa_hold(ifa);
	write_unlock(&idev->lock);
out2:
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	rcu_read_unlock_bh();
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	if (likely(err == 0))
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		inet6addr_notifier_call_chain(NETDEV_UP, ifa);
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	else {
		kfree(ifa);
		ifa = ERR_PTR(err);
	}

	return ifa;
out:
908
	spin_unlock(&addrconf_hash_lock);
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	goto out2;
}

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enum cleanup_prefix_rt_t {
	CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
	CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
	CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
};

/*
 * Check, whether the prefix for ifp would still need a prefix route
 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
 * constants.
 *
 * 1) we don't purge prefix if address was not permanent.
 *    prefix is managed by its own lifetime.
 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
 * 3) if there are no addresses, delete prefix.
 * 4) if there are still other permanent address(es),
 *    corresponding prefix is still permanent.
 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
 *    don't purge the prefix, assume user space is managing it.
 * 6) otherwise, update prefix lifetime to the
 *    longest valid lifetime among the corresponding
 *    addresses on the device.
 *    Note: subsequent RA will update lifetime.
 **/
static enum cleanup_prefix_rt_t
check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
{
	struct inet6_ifaddr *ifa;
	struct inet6_dev *idev = ifp->idev;
	unsigned long lifetime;
	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;

	*expires = jiffies;

	list_for_each_entry(ifa, &idev->addr_list, if_list) {
		if (ifa == ifp)
			continue;
		if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
				       ifp->prefix_len))
			continue;
		if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
			return CLEANUP_PREFIX_RT_NOP;

		action = CLEANUP_PREFIX_RT_EXPIRE;

		spin_lock(&ifa->lock);

		lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
		/*
		 * Note: Because this address is
		 * not permanent, lifetime <
		 * LONG_MAX / HZ here.
		 */
		if (time_before(*expires, ifa->tstamp + lifetime * HZ))
			*expires = ifa->tstamp + lifetime * HZ;
		spin_unlock(&ifa->lock);
	}

	return action;
}

static void
cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
{
	struct rt6_info *rt;

	rt = addrconf_get_prefix_route(&ifp->addr,
				       ifp->prefix_len,
				       ifp->idev->dev,
				       0, RTF_GATEWAY | RTF_DEFAULT);
	if (rt) {
		if (del_rt)
			ip6_del_rt(rt);
		else {
			if (!(rt->rt6i_flags & RTF_EXPIRES))
				rt6_set_expires(rt, expires);
			ip6_rt_put(rt);
		}
	}
}


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/* This function wants to get referenced ifp and releases it before return */

static void ipv6_del_addr(struct inet6_ifaddr *ifp)
{
998
	int state;
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	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
	unsigned long expires;
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	ASSERT_RTNL();

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	spin_lock_bh(&ifp->state_lock);
	state = ifp->state;
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	ifp->state = INET6_IFADDR_STATE_DEAD;
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	spin_unlock_bh(&ifp->state_lock);

	if (state == INET6_IFADDR_STATE_DEAD)
		goto out;
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	spin_lock_bh(&addrconf_hash_lock);
	hlist_del_init_rcu(&ifp->addr_lst);
	spin_unlock_bh(&addrconf_hash_lock);
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	write_lock_bh(&ifp->idev->lock);
1017

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	if (ifp->flags&IFA_F_TEMPORARY) {
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		list_del(&ifp->tmp_list);
		if (ifp->ifpub) {
			in6_ifa_put(ifp->ifpub);
			ifp->ifpub = NULL;
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		}
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		__in6_ifa_put(ifp);
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	}

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	if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
		action = check_cleanup_prefix_route(ifp, &expires);
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	list_del_init(&ifp->if_list);
	__in6_ifa_put(ifp);

	write_unlock_bh(&ifp->idev->lock);
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	addrconf_del_dad_work(ifp);
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	ipv6_ifa_notify(RTM_DELADDR, ifp);

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	inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
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	if (action != CLEANUP_PREFIX_RT_NOP) {
		cleanup_prefix_route(ifp, expires,
			action == CLEANUP_PREFIX_RT_DEL);
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	}

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	/* clean up prefsrc entries */
	rt6_remove_prefsrc(ifp);
1048
out:
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	in6_ifa_put(ifp);
}

static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
{
	struct inet6_dev *idev = ifp->idev;
	struct in6_addr addr, *tmpaddr;
1056
	unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1057
	unsigned long regen_advance;
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	int tmp_plen;
	int ret = 0;
1060
	u32 addr_flags;
1061
	unsigned long now = jiffies;
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	write_lock_bh(&idev->lock);
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	if (ift) {
		spin_lock_bh(&ift->lock);
		memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
		spin_unlock_bh(&ift->lock);
		tmpaddr = &addr;
	} else {
		tmpaddr = NULL;
	}
retry:
	in6_dev_hold(idev);
	if (idev->cnf.use_tempaddr <= 0) {
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		write_unlock_bh(&idev->lock);
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		pr_info("%s: use_tempaddr is disabled\n", __func__);
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		in6_dev_put(idev);
		ret = -1;
		goto out;
	}
	spin_lock_bh(&ifp->lock);
	if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
		idev->cnf.use_tempaddr = -1;	/*XXX*/
		spin_unlock_bh(&ifp->lock);
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		write_unlock_bh(&idev->lock);
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		pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
			__func__);
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		in6_dev_put(idev);
		ret = -1;
		goto out;
	}
	in6_ifa_hold(ifp);
	memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
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	__ipv6_try_regen_rndid(idev, tmpaddr);
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	memcpy(&addr.s6_addr[8], idev->rndid, 8);
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	age = (now - ifp->tstamp) / HZ;
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	tmp_valid_lft = min_t(__u32,
			      ifp->valid_lft,
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			      idev->cnf.temp_valid_lft + age);
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	tmp_prefered_lft = min_t(__u32,
				 ifp->prefered_lft,
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				 idev->cnf.temp_prefered_lft + age -
1103
				 idev->cnf.max_desync_factor);
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	tmp_plen = ifp->prefix_len;
	tmp_tstamp = ifp->tstamp;
	spin_unlock_bh(&ifp->lock);

1108
	regen_advance = idev->cnf.regen_max_retry *
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			idev->cnf.dad_transmits *
			NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1111
	write_unlock_bh(&idev->lock);
1112

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	/* A temporary address is created only if this calculated Preferred
	 * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
	 * an implementation must not create a temporary address with a zero
	 * Preferred Lifetime.
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	 * Use age calculation as in addrconf_verify to avoid unnecessary
	 * temporary addresses being generated.
1119
	 */
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	age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
	if (tmp_prefered_lft <= regen_advance + age) {
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		in6_ifa_put(ifp);
		in6_dev_put(idev);
		ret = -1;
		goto out;
	}

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	addr_flags = IFA_F_TEMPORARY;
	/* set in addrconf_prefix_rcv() */
	if (ifp->flags & IFA_F_OPTIMISTIC)
		addr_flags |= IFA_F_OPTIMISTIC;

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	ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
			    ipv6_addr_scope(&addr), addr_flags,
			    tmp_valid_lft, tmp_prefered_lft);
	if (IS_ERR(ift)) {
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		in6_ifa_put(ifp);
		in6_dev_put(idev);
1139
		pr_info("%s: retry temporary address regeneration\n", __func__);
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		tmpaddr = &addr;
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		write_lock_bh(&idev->lock);
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		goto retry;
	}

	spin_lock_bh(&ift->lock);
	ift->ifpub = ifp;
1147
	ift->cstamp = now;
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	ift->tstamp = tmp_tstamp;
	spin_unlock_bh(&ift->lock);

1151
	addrconf_dad_start(ift);
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	in6_ifa_put(ift);
	in6_dev_put(idev);
out:
	return ret;
}

/*
1159
 *	Choose an appropriate source address (RFC3484)
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 */
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enum {
	IPV6_SADDR_RULE_INIT = 0,
	IPV6_SADDR_RULE_LOCAL,
	IPV6_SADDR_RULE_SCOPE,
	IPV6_SADDR_RULE_PREFERRED,
#ifdef CONFIG_IPV6_MIP6
	IPV6_SADDR_RULE_HOA,
#endif
	IPV6_SADDR_RULE_OIF,
	IPV6_SADDR_RULE_LABEL,
	IPV6_SADDR_RULE_PRIVACY,
	IPV6_SADDR_RULE_ORCHID,
	IPV6_SADDR_RULE_PREFIX,
	IPV6_SADDR_RULE_MAX
};

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struct ipv6_saddr_score {
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	int			rule;
	int			addr_type;
	struct inet6_ifaddr	*ifa;
	DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
	int			scopedist;
	int			matchlen;
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};

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struct ipv6_saddr_dst {
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	const struct in6_addr *addr;
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	int ifindex;
	int scope;
	int label;
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	unsigned int prefs;
1192
};
1193

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static inline int ipv6_saddr_preferred(int type)
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{
1196
	if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
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		return 1;
	return 0;
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}

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static int ipv6_get_saddr_eval(struct net *net,
			       struct ipv6_saddr_score *score,
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			       struct ipv6_saddr_dst *dst,
			       int i)
{
	int ret;

	if (i <= score->rule) {
		switch (i) {
		case IPV6_SADDR_RULE_SCOPE:
			ret = score->scopedist;
			break;
		case IPV6_SADDR_RULE_PREFIX:
			ret = score->matchlen;
			break;
		default:
			ret = !!test_bit(i, score->scorebits);
		}
		goto out;
	}

	switch (i) {
	case IPV6_SADDR_RULE_INIT:
		/* Rule 0: remember if hiscore is not ready yet */
		ret = !!score->ifa;
		break;
	case IPV6_SADDR_RULE_LOCAL:
		/* Rule 1: Prefer same address */
		ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
		break;
	case IPV6_SADDR_RULE_SCOPE:
		/* Rule 2: Prefer appropriate scope
		 *
		 *      ret
		 *       ^
		 *    -1 |  d 15
		 *    ---+--+-+---> scope
		 *       |
		 *       |             d is scope of the destination.
		 *  B-d  |  \
		 *       |   \      <- smaller scope is better if
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		 *  B-15 |    \        if scope is enough for destination.
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		 *       |             ret = B - scope (-1 <= scope >= d <= 15).
		 * d-C-1 | /
		 *       |/         <- greater is better
		 *   -C  /             if scope is not enough for destination.
		 *      /|             ret = scope - C (-1 <= d < scope <= 15).
		 *
		 * d - C - 1 < B -15 (for all -1 <= d <= 15).
		 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
		 * Assume B = 0 and we get C > 29.
		 */
		ret = __ipv6_addr_src_scope(score->addr_type);
		if (ret >= dst->scope)
			ret = -ret;
		else
			ret -= 128;	/* 30 is enough */
		score->scopedist = ret;
		break;
	case IPV6_SADDR_RULE_PREFERRED:
		/* Rule 3: Avoid deprecated and optimistic addresses */
		ret = ipv6_saddr_preferred(score->addr_type) ||
		      !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
		break;
#ifdef CONFIG_IPV6_MIP6
	case IPV6_SADDR_RULE_HOA:
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	    {
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		/* Rule 4: Prefer home address */
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		int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
		ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
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		break;
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	    }
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#endif
	case IPV6_SADDR_RULE_OIF:
		/* Rule 5: Prefer outgoing interface */
		ret = (!dst->ifindex ||
		       dst->ifindex == score->ifa->idev->dev->ifindex);
		break;
	case IPV6_SADDR_RULE_LABEL:
		/* Rule 6: Prefer matching label */
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		ret = ipv6_addr_label(net,
				      &score->ifa->addr, score->addr_type,
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				      score->ifa->idev->dev->ifindex) == dst->label;
		break;
	case IPV6_SADDR_RULE_PRIVACY:
1286
	    {
1287
		/* Rule 7: Prefer public address
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		 * Note: prefer temporary address if use_tempaddr >= 2
1289
		 */
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		int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
				!!(dst->prefs & IPV6_PREFER_SRC_TMP) :
				score->ifa->idev->cnf.use_tempaddr >= 2;
		ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
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		break;
1295
	    }
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	case IPV6_SADDR_RULE_ORCHID:
		/* Rule 8-: Prefer ORCHID vs ORCHID or
		 *	    non-ORCHID vs non-ORCHID
		 */
		ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
			ipv6_addr_orchid(dst->addr));
		break;
	case IPV6_SADDR_RULE_PREFIX:
		/* Rule 8: Use longest matching prefix */
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		ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
		if (ret > score->ifa->prefix_len)
			ret = score->ifa->prefix_len;
		score->matchlen = ret;
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		break;
	default:
		ret = 0;
	}

	if (ret)
		__set_bit(i, score->scorebits);
	score->rule = i;
out:
	return ret;
}

1321
int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1322
		       const struct in6_addr *daddr, unsigned int prefs,
1323
		       struct in6_addr *saddr)
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{
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	struct ipv6_saddr_score scores[2],
				*score = &scores[0], *hiscore = &scores[1];
	struct ipv6_saddr_dst dst;
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	struct net_device *dev;
1329
	int dst_type;
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	dst_type = __ipv6_addr_type(daddr);
	dst.addr = daddr;
	dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
	dst.scope = __ipv6_addr_src_scope(dst_type);
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	dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
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	dst.prefs = prefs;
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	hiscore->rule = -1;
	hiscore->ifa = NULL;
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1341
	rcu_read_lock();
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1343
	for_each_netdev_rcu(net, dev) {
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		struct inet6_dev *idev;

1346
		/* Candidate Source Address (section 4)
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		 *  - multicast and link-local destination address,
		 *    the set of candidate source address MUST only
		 *    include addresses assigned to interfaces
		 *    belonging to the same link as the outgoing
		 *    interface.
		 * (- For site-local destination addresses, the
		 *    set of candidate source addresses MUST only
		 *    include addresses assigned to interfaces
		 *    belonging to the same site as the outgoing
		 *    interface.)
		 */
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		if (((dst_type & IPV6_ADDR_MULTICAST) ||
		     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
		    dst.ifindex && dev->ifindex != dst.ifindex)
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			continue;
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		idev = __in6_dev_get(dev);
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		if (!idev)
			continue;

		read_lock_bh(&idev->lock);
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		list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1369
			int i;
1370

1371
			/*
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			 * - Tentative Address (RFC2462 section 5.4)
			 *  - A tentative address is not considered
			 *    "assigned to an interface" in the traditional
1375
			 *    sense, unless it is also flagged as optimistic.
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			 * - Candidate Source Address (section 4)
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			 *  - In any case, anycast addresses, multicast
			 *    addresses, and the unspecified address MUST
			 *    NOT be included in a candidate set.
			 */
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			if ((score->ifa->flags & IFA_F_TENTATIVE) &&
			    (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
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				continue;
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			score->addr_type = __ipv6_addr_type(&score->ifa->addr);

			if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
				     score->addr_type & IPV6_ADDR_MULTICAST)) {
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				LIMIT_NETDEBUG(KERN_DEBUG
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					       "ADDRCONF: unspecified / multicast address "
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					       "assigned as unicast address on %s",
					       dev->name);
				continue;
			}

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			score->rule = -1;
			bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);

			for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
				int minihiscore, miniscore;

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				minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
				miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
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				if (minihiscore > miniscore) {
					if (i == IPV6_SADDR_RULE_SCOPE &&
					    score->scopedist > 0) {
						/*
						 * special case:
						 * each remaining entry
						 * has too small (not enough)
						 * scope, because ifa entries
						 * are sorted by their scope
						 * values.
						 */
						goto try_nextdev;
					}
					break;
				} else if (minihiscore < miniscore) {
					if (hiscore->ifa)
						in6_ifa_put(hiscore->ifa);

					in6_ifa_hold(score->ifa);

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					swap(hiscore, score);
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					/* restore our iterator */
					score->ifa = hiscore->ifa;

					break;
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				}
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			}
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		}
1434
try_nextdev:
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		read_unlock_bh(&idev->lock);
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	}
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	rcu_read_unlock();
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1439
	if (!hiscore->ifa)
1440
		return -EADDRNOTAVAIL;
1441

1442
	*saddr = hiscore->ifa->addr;
1443
	in6_ifa_put(hiscore->ifa);
1444
	return 0;
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}
1446
EXPORT_SYMBOL(ipv6_dev_get_saddr);
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1448
int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1449
		      u32 banned_flags)
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{
	struct inet6_ifaddr *ifp;
	int err = -EADDRNOTAVAIL;

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	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
		if (ifp->scope > IFA_LINK)
			break;
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		if (ifp->scope == IFA_LINK &&
		    !(ifp->flags & banned_flags)) {
			*addr = ifp->addr;
			err = 0;
			break;
		}
	}
	return err;
}

1467
int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1468
		    u32 banned_flags)
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{
	struct inet6_dev *idev;
	int err = -EADDRNOTAVAIL;

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	rcu_read_lock();
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	idev = __in6_dev_get(dev);
	if (idev) {
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		read_lock_bh(&idev->lock);
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		err = __ipv6_get_lladdr(idev, addr, banned_flags);
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		read_unlock_bh(&idev->lock);
	}
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	rcu_read_unlock();
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	return err;
}

static int ipv6_count_addresses(struct inet6_dev *idev)
{
	int cnt = 0;
	struct inet6_ifaddr *ifp;

	read_lock_bh(&idev->lock);
1490
	list_for_each_entry(ifp, &idev->addr_list, if_list)
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		cnt++;
	read_unlock_bh(&idev->lock);
	return cnt;
}

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int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1497
		  const struct net_device *dev, int strict)
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{
1499
	struct inet6_ifaddr *ifp;
1500
	unsigned int hash = inet6_addr_hash(addr);
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1502
	rcu_read_lock_bh();
1503
	hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1504
		if (!net_eq(dev_net(ifp->idev->dev), net))
1505
			continue;
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		if (ipv6_addr_equal(&ifp->addr, addr) &&
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		    !(ifp->flags&IFA_F_TENTATIVE) &&
		    (dev == NULL || ifp->idev->dev == dev ||
		     !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
			rcu_read_unlock_bh();
			return 1;
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		}
	}
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	rcu_read_unlock_bh();
	return 0;
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}
1518 1519
EXPORT_SYMBOL(ipv6_chk_addr);

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static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
			       struct net_device *dev)
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{
1523
	unsigned int hash = inet6_addr_hash(addr);
1524
	struct inet6_ifaddr *ifp;
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1526
	hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1527
		if (!net_eq(dev_net(ifp->idev->dev), net))
1528
			continue;
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		if (ipv6_addr_equal(&ifp->addr, addr)) {
			if (dev == NULL || ifp->idev->dev == dev)
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				return true;
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		}
	}
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	return false;
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}

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/* Compares an address/prefix_len with addresses on device @dev.
 * If one is found it returns true.
 */
bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
	const unsigned int prefix_len, struct net_device *dev)
{
	struct inet6_dev *idev;
	struct inet6_ifaddr *ifa;
	bool ret = false;

	rcu_read_lock();
	idev = __in6_dev_get(dev);
	if (idev) {
		read_lock_bh(&idev->lock);
		list_for_each_entry(ifa, &idev->addr_list, if_list) {
			ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
			if (ret)
				break;
		}
		read_unlock_bh(&idev->lock);
	}
	rcu_read_unlock();

	return ret;
}
EXPORT_SYMBOL(ipv6_chk_custom_prefix);

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int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
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{
	struct inet6_dev *idev;
	struct inet6_ifaddr *ifa;
	int	onlink;

	onlink = 0;
	rcu_read_lock();
	idev = __in6_dev_get(dev);
	if (idev) {
		read_lock_bh(&idev->lock);
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		list_for_each_entry(ifa, &idev->addr_list, if_list) {
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			onlink = ipv6_prefix_equal(addr, &ifa->addr,
						   ifa->prefix_len);
			if (onlink)
				break;
		}
		read_unlock_bh(&idev->lock);
	}
	rcu_read_unlock();
	return onlink;
}
EXPORT_SYMBOL(ipv6_chk_prefix);

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struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1589
				     struct net_device *dev, int strict)
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{
1591
	struct inet6_ifaddr *ifp, *result = NULL;
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	unsigned int hash = inet6_addr_hash(addr);
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	rcu_read_lock_bh();
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	hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
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		if (!net_eq(dev_net(ifp->idev->dev), net))
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			continue;
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		if (ipv6_addr_equal(&ifp->addr, addr)) {
			if (dev == NULL || ifp->idev->dev == dev ||
			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
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				result = ifp;
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				in6_ifa_hold(ifp);
				break;
			}
		}
	}
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	rcu_read_unlock_bh();
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	return result;
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}

/* Gets referenced address, destroys ifaddr */

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static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
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{
	if (ifp->flags&IFA_F_PERMANENT) {
		spin_lock_bh(&ifp->lock);
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		addrconf_del_dad_work(ifp);
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		ifp->flags |= IFA_F_TENTATIVE;
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		if (dad_failed)
			ifp->flags |= IFA_F_DADFAILED;
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		spin_unlock_bh(&ifp->lock);
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		if (dad_failed)
			ipv6_ifa_notify(0, ifp);
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		in6_ifa_put(ifp);
	} else if (ifp->flags&IFA_F_TEMPORARY) {
		struct inet6_ifaddr *ifpub;
		spin_lock_bh(&ifp->lock);
		ifpub = ifp->ifpub;
		if (ifpub) {
			in6_ifa_hold(ifpub);
			spin_unlock_bh(&ifp->lock);
			ipv6_create_tempaddr(ifpub, ifp);
			in6_ifa_put(ifpub);
		} else {
			spin_unlock_bh(&ifp->lock);
		}
		ipv6_del_addr(ifp);
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	} else {
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		ipv6_del_addr(ifp);
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	}
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}

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static int addrconf_dad_end(struct inet6_ifaddr *ifp)
{
	int err = -ENOENT;

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	spin_lock_bh(&ifp->state_lock);
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	if (ifp->state == INET6_IFADDR_STATE_DAD) {
		ifp->state = INET6_IFADDR_STATE_POSTDAD;
		err = 0;
	}
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	spin_unlock_bh(&ifp->state_lock);
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	return err;
}

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void addrconf_dad_failure(struct inet6_ifaddr *ifp)
{
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	struct inet6_dev *idev = ifp->idev;
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	if (addrconf_dad_end(ifp)) {
		in6_ifa_put(ifp);
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		return;
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	}
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	net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
			     ifp->idev->dev->name, &ifp->addr);
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	if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
		struct in6_addr addr;

		addr.s6_addr32[0] = htonl(0xfe800000);
		addr.s6_addr32[1] = 0;

		if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
		    ipv6_addr_equal(&ifp->addr, &addr)) {
			/* DAD failed for link-local based on MAC address */
			idev->cnf.disable_ipv6 = 1;
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			pr_info("%s: IPv6 being disabled!\n",
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				ifp->idev->dev->name);
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		}
	}

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	spin_lock_bh(&ifp->state_lock);
	/* transition from _POSTDAD to _ERRDAD */
	ifp->state = INET6_IFADDR_STATE_ERRDAD;
	spin_unlock_bh(&ifp->state_lock);

	addrconf_mod_dad_work(ifp, 0);
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	in6_ifa_put(ifp);
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}
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/* Join to solicited addr multicast group.
 * caller must hold RTNL */
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void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
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{
	struct in6_addr maddr;

	if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
		return;

	addrconf_addr_solict_mult(addr, &maddr);
	ipv6_dev_mc_inc(dev, &maddr);
}

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/* caller must hold RTNL */
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void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
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{
	struct in6_addr maddr;

	if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
		return;

	addrconf_addr_solict_mult(addr, &maddr);
	__ipv6_dev_mc_dec(idev, &maddr);
}

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/* caller must hold RTNL */
1721
static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
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{
	struct in6_addr addr;
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	if (ifp->prefix_len >= 127) /* RFC 6164 */
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		return;
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	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
	if (ipv6_addr_any(&addr))
		return;
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	__ipv6_dev_ac_inc(ifp->idev, &addr);
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}

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/* caller must hold RTNL */
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static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
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{
	struct in6_addr addr;
1737

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	if (ifp->prefix_len >= 127) /* RFC 6164 */
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		return;
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	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
	if (ipv6_addr_any(&addr))
		return;
	__ipv6_dev_ac_dec(ifp->idev, &addr);
}

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static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
{
	if (dev->addr_len != ETH_ALEN)
		return -1;
	memcpy(eui, dev->dev_addr, 3);
	memcpy(eui + 5, dev->dev_addr + 3, 3);

	/*
	 * The zSeries OSA network cards can be shared among various
	 * OS instances, but the OSA cards have only one MAC address.
	 * This leads to duplicate address conflicts in conjunction
	 * with IPv6 if more than one instance uses the same card.
	 *
	 * The driver for these cards can deliver a unique 16-bit
	 * identifier for each instance sharing the same card.  It is
	 * placed instead of 0xFFFE in the interface identifier.  The
	 * "u" bit of the interface identifier is not inverted in this
	 * case.  Hence the resulting interface identifier has local
	 * scope according to RFC2373.
	 */
	if (dev->dev_id) {
		eui[3] = (dev->dev_id >> 8) & 0xFF;
		eui[4] = dev->dev_id & 0xFF;
	} else {
		eui[3] = 0xFF;
		eui[4] = 0xFE;
		eui[0] ^= 2;
	}
	return 0;
}

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static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
{
	if (dev->addr_len != IEEE802154_ADDR_LEN)
		return -1;
	memcpy(eui, dev->dev_addr, 8);
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	eui[0] ^= 2;
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	return 0;
}

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static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
{
	union fwnet_hwaddr *ha;

	if (dev->addr_len != FWNET_ALEN)
		return -1;

	ha = (union fwnet_hwaddr *)dev->dev_addr;

	memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
	eui[0] ^= 2;
	return 0;
}

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static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
{
	/* XXX: inherit EUI-64 from other interface -- yoshfuji */
	if (dev->addr_len != ARCNET_ALEN)
		return -1;
	memset(eui, 0, 7);
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	eui[7] = *(u8 *)dev->dev_addr;
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	return 0;
}

static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
{
	if (dev->addr_len != INFINIBAND_ALEN)
		return -1;
	memcpy(eui, dev->dev_addr + 12, 8);
	eui[0] |= 2;
	return 0;
}

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static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1820
{
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	if (addr == 0)
		return -1;
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	eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
		  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
		  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
		  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
		  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
		  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
	eui[1] = 0;
	eui[2] = 0x5E;
	eui[3] = 0xFE;
	memcpy(eui + 4, &addr, 4);
	return 0;
}

static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
{
	if (dev->priv_flags & IFF_ISATAP)
		return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
	return -1;
}

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static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
{
	return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
}

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static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
{
	memcpy(eui, dev->perm_addr, 3);
	memcpy(eui + 5, dev->perm_addr + 3, 3);
	eui[3] = 0xFF;
	eui[4] = 0xFE;
	eui[0] ^= 2;
	return 0;
}

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static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
{
	switch (dev->type) {
	case ARPHRD_ETHER:
	case ARPHRD_FDDI:
1863
		return addrconf_ifid_eui48(eui, dev);
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	case ARPHRD_ARCNET:
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		return addrconf_ifid_arcnet(eui, dev);
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	case ARPHRD_INFINIBAND:
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		return addrconf_ifid_infiniband(eui, dev);
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	case ARPHRD_SIT:
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		return addrconf_ifid_sit(eui, dev);
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	case ARPHRD_IPGRE:
		return addrconf_ifid_gre(eui, dev);
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	case ARPHRD_6LOWPAN:
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	case ARPHRD_IEEE802154:
		return addrconf_ifid_eui64(eui, dev);
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	case ARPHRD_IEEE1394:
		return addrconf_ifid_ieee1394(eui, dev);
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	case ARPHRD_TUNNEL6:
		return addrconf_ifid_ip6tnl(eui, dev);
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	}
	return -1;
}

static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
{
	int err = -1;
	struct inet6_ifaddr *ifp;

	read_lock_bh(&idev->lock);
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	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
		if (ifp->scope > IFA_LINK)
			break;
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		if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
			memcpy(eui, ifp->addr.s6_addr+8, 8);
			err = 0;
			break;
		}
	}
	read_unlock_bh(&idev->lock);
	return err;
}

/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
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1903
static void __ipv6_regen_rndid(struct inet6_dev *idev)
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{
regen:
1906
	get_random_bytes(idev->rndid, sizeof(idev->rndid));
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	idev->rndid[0] &= ~0x02;

	/*
	 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
	 * check if generated address is not inappropriate
	 *
	 *  - Reserved subnet anycast (RFC 2526)
	 *	11111101 11....11 1xxxxxxx
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	 *  - ISATAP (RFC4214) 6.1
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	 *	00-00-5E-FE-xx-xx-xx-xx
	 *  - value 0
	 *  - XXX: already assigned to an address on the device
	 */
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	if (idev->rndid[0] == 0xfd &&
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	    (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
	    (idev->rndid[7]&0x80))
		goto regen;
	if ((idev->rndid[0]|idev->rndid[1]) == 0) {
		if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
			goto regen;
		if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
			goto regen;
	}
}

static void ipv6_regen_rndid(unsigned long data)
{
	struct inet6_dev *idev = (struct inet6_dev *) data;
	unsigned long expires;

1937
	rcu_read_lock_bh();
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	write_lock_bh(&idev->lock);

	if (idev->dead)
		goto out;

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	__ipv6_regen_rndid(idev);
1944

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	expires = jiffies +
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		idev->cnf.temp_prefered_lft * HZ -
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		idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
		NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
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		idev->cnf.max_desync_factor * HZ;
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	if (time_before(expires, jiffies)) {
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		pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
			__func__, idev->dev->name);
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		goto out;
	}

	if (!mod_timer(&idev->regen_timer, expires))
		in6_dev_hold(idev);

out:
	write_unlock_bh(&idev->lock);
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	rcu_read_unlock_bh();
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	in6_dev_put(idev);
}

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static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
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{
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	if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
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		__ipv6_regen_rndid(idev);
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}

/*
 *	Add prefix route.
 */

static void
addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1977
		      unsigned long expires, u32 flags)
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{
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	struct fib6_config cfg = {
		.fc_table = RT6_TABLE_PREFIX,
		.fc_metric = IP6_RT_PRIO_ADDRCONF,
		.fc_ifindex = dev->ifindex,
		.fc_expires = expires,
		.fc_dst_len = plen,
		.fc_flags = RTF_UP | flags,
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		.fc_nlinfo.nl_net = dev_net(dev),
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		.fc_protocol = RTPROT_KERNEL,
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	};
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	cfg.fc_dst = *pfx;
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	/* Prevent useless cloning on PtP SIT.
	   This thing is done here expecting that the whole
	   class of non-broadcast devices need not cloning.
	 */
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1996
#if IS_ENABLED(CONFIG_IPV6_SIT)
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	if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
		cfg.fc_flags |= RTF_NONEXTHOP;
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#endif
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	ip6_route_add(&cfg);
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}

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static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
						  int plen,
						  const struct net_device *dev,
						  u32 flags, u32 noflags)
{
	struct fib6_node *fn;
	struct rt6_info *rt = NULL;
	struct fib6_table *table;

	table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
	if (table == NULL)
		return NULL;

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	read_lock_bh(&table->tb6_lock);
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	fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
	if (!fn)
		goto out;
	for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
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		if (rt->dst.dev->ifindex != dev->ifindex)
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			continue;
		if ((rt->rt6i_flags & flags) != flags)
			continue;
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		if ((rt->rt6i_flags & noflags) != 0)
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			continue;
		dst_hold(&rt->dst);
		break;
	}
out:
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	read_unlock_bh(&table->tb6_lock);
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	return rt;
}


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/* Create "default" multicast route to the interface */

static void addrconf_add_mroute(struct net_device *dev)
{
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	struct fib6_config cfg = {
		.fc_table = RT6_TABLE_LOCAL,
		.fc_metric = IP6_RT_PRIO_ADDRCONF,
		.fc_ifindex = dev->ifindex,
		.fc_dst_len = 8,
		.fc_flags = RTF_UP,
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		.fc_nlinfo.nl_net = dev_net(dev),
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	};

	ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);

	ip6_route_add(&cfg);
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}

static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
{
	struct inet6_dev *idev;

	ASSERT_RTNL();

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	idev = ipv6_find_idev(dev);
	if (!idev)
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		return ERR_PTR(-ENOBUFS);

	if (idev->cnf.disable_ipv6)
		return ERR_PTR(-EACCES);
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	/* Add default multicast route */
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	if (!(dev->flags & IFF_LOOPBACK))
		addrconf_add_mroute(dev);
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	return idev;
}

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static void manage_tempaddrs(struct inet6_dev *idev,
			     struct inet6_ifaddr *ifp,
			     __u32 valid_lft, __u32 prefered_lft,
			     bool create, unsigned long now)
{
	u32 flags;
	struct inet6_ifaddr *ift;

	read_lock_bh(&idev->lock);
	/* update all temporary addresses in the list */
	list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
		int age, max_valid, max_prefered;

		if (ifp != ift->ifpub)
			continue;

		/* RFC 4941 section 3.3:
		 * If a received option will extend the lifetime of a public
		 * address, the lifetimes of temporary addresses should
		 * be extended, subject to the overall constraint that no
		 * temporary addresses should ever remain "valid" or "preferred"
		 * for a time longer than (TEMP_VALID_LIFETIME) or
		 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
		 */
		age = (now - ift->cstamp) / HZ;
		max_valid = idev->cnf.temp_valid_lft - age;
		if (max_valid < 0)
			max_valid = 0;

		max_prefered = idev->cnf.temp_prefered_lft -
			       idev->cnf.max_desync_factor - age;
		if (max_prefered < 0)
			max_prefered = 0;

		if (valid_lft > max_valid)
			valid_lft = max_valid;

		if (prefered_lft > max_prefered)
			prefered_lft = max_prefered;

		spin_lock(&ift->lock);
		flags = ift->flags;
		ift->valid_lft = valid_lft;
		ift->prefered_lft = prefered_lft;
		ift->tstamp = now;
		if (prefered_lft > 0)
			ift->flags &= ~IFA_F_DEPRECATED;

		spin_unlock(&ift->lock);
		if (!(flags&IFA_F_TENTATIVE))
			ipv6_ifa_notify(0, ift);
	}

	if ((create || list_empty(&idev->tempaddr_list)) &&
	    idev->cnf.use_tempaddr > 0) {
		/* When a new public address is created as described
		 * in [ADDRCONF], also create a new temporary address.
		 * Also create a temporary address if it's enabled but
		 * no temporary address currently exists.
		 */
		read_unlock_bh(&idev->lock);
		ipv6_create_tempaddr(ifp, NULL);
	} else {
		read_unlock_bh(&idev->lock);
	}
}

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void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
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{
	struct prefix_info *pinfo;
	__u32 valid_lft;
	__u32 prefered_lft;
	int addr_type;
	struct inet6_dev *in6_dev;
2150
	struct net *net = dev_net(dev);
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	pinfo = (struct prefix_info *) opt;
2153

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	if (len < sizeof(struct prefix_info)) {
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		ADBG("addrconf: prefix option too short\n");
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		return;
	}
2158

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	/*
	 *	Validation checks ([ADDRCONF], page 19)
	 */

	addr_type = ipv6_addr_type(&pinfo->prefix);

	if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
		return;

	valid_lft = ntohl(pinfo->valid);
	prefered_lft = ntohl(pinfo->prefered);

	if (prefered_lft > valid_lft) {
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		net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
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		return;
	}

	in6_dev = in6_dev_get(dev);

	if (in6_dev == NULL) {
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		net_dbg_ratelimited("addrconf: device %s not configured\n",
				    dev->name);
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		return;
	}

	/*
	 *	Two things going on here:
	 *	1) Add routes for on-link prefixes
	 *	2) Configure prefixes with the auto flag set
	 */

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	if (pinfo->onlink) {
		struct rt6_info *rt;
		unsigned long rt_expires;

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		/* Avoid arithmetic overflow. Really, we could
		 * save rt_expires in seconds, likely valid_lft,
		 * but it would require division in fib gc, that it
		 * not good.
		 */
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		if (HZ > USER_HZ)
			rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
		else
			rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
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		if (addrconf_finite_timeout(rt_expires))
			rt_expires *= HZ;
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		rt = addrconf_get_prefix_route(&pinfo->prefix,
					       pinfo->prefix_len,
					       dev,
					       RTF_ADDRCONF | RTF_PREFIX_RT,
					       RTF_GATEWAY | RTF_DEFAULT);
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		if (rt) {
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			/* Autoconf prefix route */
			if (valid_lft == 0) {
				ip6_del_rt(rt);
				rt = NULL;
2218
			} else if (addrconf_finite_timeout(rt_expires)) {
2219
				/* not infinity */
2220
				rt6_set_expires(rt, jiffies + rt_expires);
2221
			} else {
2222
				rt6_clean_expires(rt);
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			}
		} else if (valid_lft) {
2225
			clock_t expires = 0;
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			int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
			if (addrconf_finite_timeout(rt_expires)) {
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				/* not infinity */
				flags |= RTF_EXPIRES;
				expires = jiffies_to_clock_t(rt_expires);
			}
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			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2233
					      dev, expires, flags);
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		}
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		ip6_rt_put(rt);
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	}

	/* Try to figure out our local address for this prefix */

	if (pinfo->autoconf && in6_dev->cnf.autoconf) {
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		struct inet6_ifaddr *ifp;
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		struct in6_addr addr;
		int create = 0, update_lft = 0;
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		bool tokenized = false;
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		if (pinfo->prefix_len == 64) {
			memcpy(&addr, &pinfo->prefix, 8);
2248 2249 2250 2251 2252 2253

			if (!ipv6_addr_any(&in6_dev->token)) {
				read_lock_bh(&in6_dev->lock);
				memcpy(addr.s6_addr + 8,
				       in6_dev->token.s6_addr + 8, 8);
				read_unlock_bh(&in6_dev->lock);
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				tokenized = true;
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			} else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
				   ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
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				in6_dev_put(in6_dev);
				return;
			}
			goto ok;
		}
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		net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
				    pinfo->prefix_len);
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		in6_dev_put(in6_dev);
		return;

ok:

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		ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
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		if (ifp == NULL && valid_lft) {
			int max_addresses = in6_dev->cnf.max_addresses;
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			u32 addr_flags = 0;

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
			if (in6_dev->cnf.optimistic_dad &&
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			    !net->ipv6.devconf_all->forwarding && sllao)
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				addr_flags = IFA_F_OPTIMISTIC;
#endif
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			/* Do not allow to create too much of autoconfigured
			 * addresses; this would be too easy way to crash kernel.
			 */
			if (!max_addresses ||
			    ipv6_count_addresses(in6_dev) < max_addresses)
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				ifp = ipv6_add_addr(in6_dev, &addr, NULL,
						    pinfo->prefix_len,
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						    addr_type&IPV6_ADDR_SCOPE_MASK,
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						    addr_flags, valid_lft,
						    prefered_lft);
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			if (IS_ERR_OR_NULL(ifp)) {
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				in6_dev_put(in6_dev);
				return;
			}

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			update_lft = 0;
			create = 1;
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			spin_lock_bh(&ifp->lock);
			ifp->flags |= IFA_F_MANAGETEMPADDR;
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			ifp->cstamp = jiffies;
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			ifp->tokenized = tokenized;
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			spin_unlock_bh(&ifp->lock);
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			addrconf_dad_start(ifp);
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		}

		if (ifp) {
2308
			u32 flags;
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			unsigned long now;
			u32 stored_lft;

			/* update lifetime (RFC2462 5.5.3 e) */
			spin_lock(&ifp->lock);
			now = jiffies;
			if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
				stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
			else
				stored_lft = 0;
2319
			if (!update_lft && !create && stored_lft) {
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				const u32 minimum_lft = min(
					stored_lft, (u32)MIN_VALID_LIFETIME);
				valid_lft = max(valid_lft, minimum_lft);

				/* RFC4862 Section 5.5.3e:
				 * "Note that the preferred lifetime of the
				 *  corresponding address is always reset to
				 *  the Preferred Lifetime in the received
				 *  Prefix Information option, regardless of
				 *  whether the valid lifetime is also reset or
				 *  ignored."
				 *
				 * So we should always update prefered_lft here.
				 */
				update_lft = 1;
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			}

			if (update_lft) {
				ifp->valid_lft = valid_lft;
				ifp->prefered_lft = prefered_lft;
				ifp->tstamp = now;
				flags = ifp->flags;
				ifp->flags &= ~IFA_F_DEPRECATED;
				spin_unlock(&ifp->lock);

				if (!(flags&IFA_F_TENTATIVE))
					ipv6_ifa_notify(0, ifp);
			} else
				spin_unlock(&ifp->lock);

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			manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
					 create, now);
2352

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			in6_ifa_put(ifp);
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			addrconf_verify();
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		}
	}
	inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
	in6_dev_put(in6_dev);
}

/*
 *	Set destination address.
 *	Special case for SIT interfaces where we create a new "virtual"
 *	device.
 */
2366
int addrconf_set_dstaddr(struct net *net, void __user *arg)
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{
	struct in6_ifreq ireq;
	struct net_device *dev;
	int err = -EINVAL;

	rtnl_lock();

	err = -EFAULT;
	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
		goto err_exit;

2378
	dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
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	err = -ENODEV;
	if (dev == NULL)
		goto err_exit;

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#if IS_ENABLED(CONFIG_IPV6_SIT)
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	if (dev->type == ARPHRD_SIT) {
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		const struct net_device_ops *ops = dev->netdev_ops;
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		struct ifreq ifr;
		struct ip_tunnel_parm p;

		err = -EADDRNOTAVAIL;
		if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
			goto err_exit;

		memset(&p, 0, sizeof(p));
		p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
		p.iph.saddr = 0;
		p.iph.version = 4;
		p.iph.ihl = 5;
		p.iph.protocol = IPPROTO_IPV6;
		p.iph.ttl = 64;
2401
		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
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		if (ops->ndo_do_ioctl) {
			mm_segment_t oldfs = get_fs();

			set_fs(KERNEL_DS);
			err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
			set_fs(oldfs);
		} else
			err = -EOPNOTSUPP;
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		if (err == 0) {
			err = -ENOBUFS;
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			dev = __dev_get_by_name(net, p.name);
			if (!dev)
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				goto err_exit;
			err = dev_open(dev);
		}
	}
2420
#endif
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err_exit:
	rtnl_unlock();
	return err;
}

/*
 *	Manual configuration of address on an interface
 */
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static int inet6_addr_add(struct net *net, int ifindex,
			  const struct in6_addr *pfx,
2432
			  const struct in6_addr *peer_pfx,
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			  unsigned int plen, __u32 ifa_flags,
			  __u32 prefered_lft, __u32 valid_lft)
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{
	struct inet6_ifaddr *ifp;
	struct inet6_dev *idev;
	struct net_device *dev;
	int scope;
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	u32 flags;
	clock_t expires;
2442
	unsigned long timeout;
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	ASSERT_RTNL();
2445

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	if (plen > 128)
		return -EINVAL;

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	/* check the lifetime */
	if (!valid_lft || prefered_lft > valid_lft)
		return -EINVAL;

2453 2454 2455
	if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
		return -EINVAL;

2456 2457
	dev = __dev_get_by_index(net, ifindex);
	if (!dev)
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		return -ENODEV;
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	idev = addrconf_add_dev(dev);
	if (IS_ERR(idev))
		return PTR_ERR(idev);
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	scope = ipv6_addr_scope(pfx);

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	timeout = addrconf_timeout_fixup(valid_lft, HZ);
	if (addrconf_finite_timeout(timeout)) {
		expires = jiffies_to_clock_t(timeout * HZ);
		valid_lft = timeout;
2470
		flags = RTF_EXPIRES;
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	} else {
		expires = 0;
		flags = 0;
		ifa_flags |= IFA_F_PERMANENT;
2475
	}
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	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
	if (addrconf_finite_timeout(timeout)) {
		if (timeout == 0)
			ifa_flags |= IFA_F_DEPRECATED;
		prefered_lft = timeout;
	}
2483

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	ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
			    valid_lft, prefered_lft);
2486

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	if (!IS_ERR(ifp)) {
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		if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
			addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
					      expires, flags);
		}

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		/*
		 * Note that section 3.1 of RFC 4429 indicates
		 * that the Optimistic flag should not be set for
		 * manually configured addresses
		 */
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		addrconf_dad_start(ifp);
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		if (ifa_flags & IFA_F_MANAGETEMPADDR)
			manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
					 true, jiffies);
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		in6_ifa_put(ifp);
2503
		addrconf_verify_rtnl();
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		return 0;
	}

	return PTR_ERR(ifp);
}

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static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
			  const struct in6_addr *pfx, unsigned int plen)
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{
	struct inet6_ifaddr *ifp;
	struct inet6_dev *idev;
	struct net_device *dev;
2516

2517 2518 2519
	if (plen > 128)
		return -EINVAL;

2520 2521
	dev = __dev_get_by_index(net, ifindex);
	if (!dev)
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		return -ENODEV;

2524
	if ((idev = __in6_dev_get(dev)) == NULL)
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		return -ENXIO;

	read_lock_bh(&idev->lock);
2528
	list_for_each_entry(ifp, &idev->addr_list, if_list) {
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		if (ifp->prefix_len == plen &&
		    ipv6_addr_equal(pfx, &ifp->addr)) {
			in6_ifa_hold(ifp);
			read_unlock_bh(&idev->lock);
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			if (!(ifp->flags & IFA_F_TEMPORARY) &&
			    (ifa_flags & IFA_F_MANAGETEMPADDR))
				manage_tempaddrs(idev, ifp, 0, 0, false,
						 jiffies);
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			ipv6_del_addr(ifp);
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			addrconf_verify_rtnl();
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			return 0;
		}
	}
	read_unlock_bh(&idev->lock);
	return -EADDRNOTAVAIL;
}


2548
int addrconf_add_ifaddr(struct net *net, void __user *arg)
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{
	struct in6_ifreq ireq;
	int err;
2552

2553
	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
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		return -EPERM;
2555

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	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
		return -EFAULT;

	rtnl_lock();
2560
	err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
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			     ireq.ifr6_prefixlen, IFA_F_PERMANENT,
			     INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
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	rtnl_unlock();
	return err;
}

2567
int addrconf_del_ifaddr(struct net *net, void __user *arg)
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{
	struct in6_ifreq ireq;
	int err;
2571

2572
	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
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		return -EPERM;

	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
		return -EFAULT;

	rtnl_lock();
2579
	err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2580
			     ireq.ifr6_prefixlen);
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	rtnl_unlock();
	return err;
}

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static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
		     int plen, int scope)
{
	struct inet6_ifaddr *ifp;

2590
	ifp = ipv6_add_addr(idev, addr, NULL, plen,
2591 2592
			    scope, IFA_F_PERMANENT,
			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
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	if (!IS_ERR(ifp)) {
		spin_lock_bh(&ifp->lock);
		ifp->flags &= ~IFA_F_TENTATIVE;
		spin_unlock_bh(&ifp->lock);
		ipv6_ifa_notify(RTM_NEWADDR, ifp);
		in6_ifa_put(ifp);
	}
}

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#if IS_ENABLED(CONFIG_IPV6_SIT)
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static void sit_add_v4_addrs(struct inet6_dev *idev)
{
	struct in6_addr addr;
	struct net_device *dev;
2607
	struct net *net = dev_net(idev->dev);
2608
	int scope, plen;
2609
	u32 pflags = 0;
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	ASSERT_RTNL();

	memset(&addr, 0, sizeof(struct in6_addr));
	memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);

	if (idev->dev->flags&IFF_POINTOPOINT) {
		addr.s6_addr32[0] = htonl(0xfe800000);
		scope = IFA_LINK;
2619
		plen = 64;
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	} else {
		scope = IPV6_ADDR_COMPATv4;
2622
		plen = 96;
2623
		pflags |= RTF_NONEXTHOP;
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	}

	if (addr.s6_addr32[3]) {
2627
		add_addr(idev, &addr, plen, scope);
2628
		addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
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		return;
	}

2632
	for_each_netdev(net, dev) {
2633
		struct in_device *in_dev = __in_dev_get_rtnl(dev);
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		if (in_dev && (dev->flags & IFF_UP)) {
2635
			struct in_ifaddr *ifa;
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			int flag = scope;

			for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {

				addr.s6_addr32[3] = ifa->ifa_local;

				if (ifa->ifa_scope == RT_SCOPE_LINK)
					continue;
				if (ifa->ifa_scope >= RT_SCOPE_HOST) {
					if (idev->dev->flags&IFF_POINTOPOINT)
						continue;
					flag |= IFA_HOST;
				}

2651
				add_addr(idev, &addr, plen, flag);
2652 2653
				addrconf_prefix_route(&addr, plen, idev->dev, 0,
						      pflags);
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			}
		}
2656
	}
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}
2658
#endif
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static void init_loopback(struct net_device *dev)
{
	struct inet6_dev  *idev;
2663 2664 2665
	struct net_device *sp_dev;
	struct inet6_ifaddr *sp_ifa;
	struct rt6_info *sp_rt;
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	/* ::1 */

	ASSERT_RTNL();

2671
	if ((idev = ipv6_find_idev(dev)) == NULL) {
2672
		pr_debug("%s: add_dev failed\n", __func__);
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		return;
	}

2676
	add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692

	/* Add routes to other interface's IPv6 addresses */
	for_each_netdev(dev_net(dev), sp_dev) {
		if (!strcmp(sp_dev->name, dev->name))
			continue;

		idev = __in6_dev_get(sp_dev);
		if (!idev)
			continue;

		read_lock_bh(&idev->lock);
		list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {

			if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
				continue;

2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704
			if (sp_ifa->rt) {
				/* This dst has been added to garbage list when
				 * lo device down, release this obsolete dst and
				 * reallocate a new router for ifa.
				 */
				if (sp_ifa->rt->dst.obsolete > 0) {
					ip6_rt_put(sp_ifa->rt);
					sp_ifa->rt = NULL;
				} else {
					continue;
				}
			}
2705

2706
			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2707 2708

			/* Failure cases are ignored */
2709 2710
			if (!IS_ERR(sp_rt)) {
				sp_ifa->rt = sp_rt;
2711
				ip6_ins_rt(sp_rt);
2712
			}
2713 2714 2715
		}
		read_unlock_bh(&idev->lock);
	}
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}

2718
static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
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{
2720
	struct inet6_ifaddr *ifp;
2721 2722 2723 2724
	u32 addr_flags = IFA_F_PERMANENT;

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
	if (idev->cnf.optimistic_dad &&
2725
	    !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2726 2727
		addr_flags |= IFA_F_OPTIMISTIC;
#endif
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2729

2730 2731
	ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
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	if (!IS_ERR(ifp)) {
2733
		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2734
		addrconf_dad_start(ifp);
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		in6_ifa_put(ifp);
	}
}

2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755
static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
{
	if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
		struct in6_addr addr;

		ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
		/* addrconf_add_linklocal also adds a prefix_route and we
		 * only need to care about prefix routes if ipv6_generate_eui64
		 * couldn't generate one.
		 */
		if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
			addrconf_add_linklocal(idev, &addr);
		else if (prefix_route)
			addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
	}
}

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static void addrconf_dev_config(struct net_device *dev)
{
2758
	struct inet6_dev *idev;
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	ASSERT_RTNL();

2762 2763 2764
	if ((dev->type != ARPHRD_ETHER) &&
	    (dev->type != ARPHRD_FDDI) &&
	    (dev->type != ARPHRD_ARCNET) &&
2765
	    (dev->type != ARPHRD_INFINIBAND) &&
2766
	    (dev->type != ARPHRD_IEEE802154) &&
2767
	    (dev->type != ARPHRD_IEEE1394) &&
2768 2769
	    (dev->type != ARPHRD_TUNNEL6) &&
	    (dev->type != ARPHRD_6LOWPAN)) {
2770 2771 2772 2773
		/* Alas, we support only Ethernet autoconfiguration. */
		return;
	}

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	idev = addrconf_add_dev(dev);
2775
	if (IS_ERR(idev))
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		return;

2778
	addrconf_addr_gen(idev, false);
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}

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2781
#if IS_ENABLED(CONFIG_IPV6_SIT)
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static void addrconf_sit_config(struct net_device *dev)
{
	struct inet6_dev *idev;

	ASSERT_RTNL();

2788 2789 2790
	/*
	 * Configure the tunnel with one of our IPv4
	 * addresses... we should configure all of
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	 * our v4 addrs in the tunnel
	 */

2794
	if ((idev = ipv6_find_idev(dev)) == NULL) {
2795
		pr_debug("%s: add_dev failed\n", __func__);
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		return;
	}

2799
	if (dev->priv_flags & IFF_ISATAP) {
2800
		addrconf_addr_gen(idev, false);
2801 2802 2803
		return;
	}

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	sit_add_v4_addrs(idev);

2806
	if (dev->flags&IFF_POINTOPOINT)
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		addrconf_add_mroute(dev);
}
2809
#endif
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2810

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2811
#if IS_ENABLED(CONFIG_NET_IPGRE)
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static void addrconf_gre_config(struct net_device *dev)
{
	struct inet6_dev *idev;

	ASSERT_RTNL();

2818
	if ((idev = ipv6_find_idev(dev)) == NULL) {
2819
		pr_debug("%s: add_dev failed\n", __func__);
2820 2821 2822
		return;
	}

2823
	addrconf_addr_gen(idev, true);
2824 2825 2826
}
#endif

2827
static int addrconf_notify(struct notifier_block *this, unsigned long event,
2828
			   void *ptr)
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2829
{
2830
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2831
	struct inet6_dev *idev = __in6_dev_get(dev);
2832
	int run_pending = 0;
2833
	int err;
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2834

2835
	switch (event) {
2836
	case NETDEV_REGISTER:
2837
		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2838
			idev = ipv6_add_dev(dev);
2839 2840
			if (IS_ERR(idev))
				return notifier_from_errno(PTR_ERR(idev));
2841 2842
		}
		break;
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2843

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	case NETDEV_UP:
2845
	case NETDEV_CHANGE:
2846 2847 2848
		if (dev->flags & IFF_SLAVE)
			break;

2849 2850 2851
		if (idev && idev->cnf.disable_ipv6)
			break;

2852
		if (event == NETDEV_UP) {
2853
			if (!addrconf_qdisc_ok(dev)) {
2854
				/* device is not ready yet. */
2855
				pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2856 2857 2858
					dev->name);
				break;
			}
2859

2860 2861 2862
			if (!idev && dev->mtu >= IPV6_MIN_MTU)
				idev = ipv6_add_dev(dev);

2863
			if (!IS_ERR_OR_NULL(idev)) {
2864
				idev->if_flags |= IF_READY;
2865 2866
				run_pending = 1;
			}
2867
		} else {
2868
			if (!addrconf_qdisc_ok(dev)) {
2869 2870 2871 2872 2873
				/* device is still not ready. */
				break;
			}

			if (idev) {
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				if (idev->if_flags & IF_READY)
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					/* device is already configured. */
					break;
				idev->if_flags |= IF_READY;
			}

2880 2881
			pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
				dev->name);
2882

2883
			run_pending = 1;
2884 2885
		}

2886
		switch (dev->type) {
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2887
#if IS_ENABLED(CONFIG_IPV6_SIT)
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		case ARPHRD_SIT:
			addrconf_sit_config(dev);
			break;
2891
#endif
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2892
#if IS_ENABLED(CONFIG_NET_IPGRE)
2893 2894 2895
		case ARPHRD_IPGRE:
			addrconf_gre_config(dev);
			break;
2896
#endif
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		case ARPHRD_LOOPBACK:
			init_loopback(dev);
			break;

		default:
			addrconf_dev_config(dev);
			break;
2904
		}
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2905

2906
		if (!IS_ERR_OR_NULL(idev)) {
2907 2908 2909
			if (run_pending)
				addrconf_dad_run(idev);

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			/*
			 * If the MTU changed during the interface down,
			 * when the interface up, the changed MTU must be
			 * reflected in the idev as well as routers.
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			 */
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			if (idev->cnf.mtu6 != dev->mtu &&
			    dev->mtu >= IPV6_MIN_MTU) {
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				rt6_mtu_change(dev, dev->mtu);
				idev->cnf.mtu6 = dev->mtu;
			}
			idev->tstamp = jiffies;
			inet6_ifinfo_notify(RTM_NEWLINK, idev);
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			/*
			 * If the changed mtu during down is lower than
			 * IPV6_MIN_MTU stop IPv6 on this interface.
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			 */
			if (dev->mtu < IPV6_MIN_MTU)
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				addrconf_ifdown(dev, 1);
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		}
		break;

	case NETDEV_CHANGEMTU:
2933
		if (idev && dev->mtu >= IPV6_MIN_MTU) {
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			rt6_mtu_change(dev, dev->mtu);
			idev->cnf.mtu6 = dev->mtu;
			break;
		}

2939 2940
		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
			idev = ipv6_add_dev(dev);
2941
			if (!IS_ERR(idev))
2942 2943 2944
				break;
		}

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2945
		/*
2946
		 * if MTU under IPV6_MIN_MTU.
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		 * Stop IPv6 on this interface.
		 */
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	case NETDEV_DOWN:
	case NETDEV_UNREGISTER:
		/*
		 *	Remove all addresses from this interface.
		 */
		addrconf_ifdown(dev, event != NETDEV_DOWN);
		break;
2957

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	case NETDEV_CHANGENAME:
		if (idev) {
2960
			snmp6_unregister_dev(idev);
2961
			addrconf_sysctl_unregister(idev);
2962
			err = addrconf_sysctl_register(idev);
2963 2964
			if (err)
				return notifier_from_errno(err);
2965 2966 2967 2968 2969
			err = snmp6_register_dev(idev);
			if (err) {
				addrconf_sysctl_unregister(idev);
				return notifier_from_errno(err);
			}
2970
		}
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		break;
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2973 2974 2975
	case NETDEV_PRE_TYPE_CHANGE:
	case NETDEV_POST_TYPE_CHANGE:
		addrconf_type_change(dev, event);
2976
		break;
2977
	}
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	return NOTIFY_OK;
}

/*
 *	addrconf module should be notified of a device going up
 */
static struct notifier_block ipv6_dev_notf = {
	.notifier_call = addrconf_notify,
};

2989
static void addrconf_type_change(struct net_device *dev, unsigned long event)
2990 2991 2992 2993 2994 2995
{
	struct inet6_dev *idev;
	ASSERT_RTNL();

	idev = __in6_dev_get(dev);

2996
	if (event == NETDEV_POST_TYPE_CHANGE)
2997
		ipv6_mc_remap(idev);
2998
	else if (event == NETDEV_PRE_TYPE_CHANGE)
2999 3000 3001
		ipv6_mc_unmap(idev);
}

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static int addrconf_ifdown(struct net_device *dev, int how)
{
3004
	struct net *net = dev_net(dev);
3005 3006
	struct inet6_dev *idev;
	struct inet6_ifaddr *ifa;
3007
	int state, i;
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	ASSERT_RTNL();

3011 3012
	rt6_ifdown(net, dev);
	neigh_ifdown(&nd_tbl, dev);
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	idev = __in6_dev_get(dev);
	if (idev == NULL)
		return -ENODEV;

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	/*
	 * Step 1: remove reference to ipv6 device from parent device.
	 *	   Do not dev_put!
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3021
	 */
3022
	if (how) {
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		idev->dead = 1;
3024 3025

		/* protected by rtnl_lock */
3026
		RCU_INIT_POINTER(dev->ip6_ptr, NULL);
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		/* Step 1.5: remove snmp6 entry */
		snmp6_unregister_dev(idev);

	}

3033 3034 3035 3036 3037
	/* Step 2: clear hash table */
	for (i = 0; i < IN6_ADDR_HSIZE; i++) {
		struct hlist_head *h = &inet6_addr_lst[i];

		spin_lock_bh(&addrconf_hash_lock);
3038
restart:
3039
		hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3040 3041
			if (ifa->idev == idev) {
				hlist_del_init_rcu(&ifa->addr_lst);
3042
				addrconf_del_dad_work(ifa);
3043 3044 3045 3046 3047 3048
				goto restart;
			}
		}
		spin_unlock_bh(&addrconf_hash_lock);
	}

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	write_lock_bh(&idev->lock);

3051 3052
	addrconf_del_rs_timer(idev);

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3053
	/* Step 2: clear flags for stateless addrconf */
3054
	if (!how)
3055
		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
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3057
	if (how && del_timer(&idev->regen_timer))
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		in6_dev_put(idev);

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	/* Step 3: clear tempaddr list */
3061 3062 3063 3064
	while (!list_empty(&idev->tempaddr_list)) {
		ifa = list_first_entry(&idev->tempaddr_list,
				       struct inet6_ifaddr, tmp_list);
		list_del(&ifa->tmp_list);
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		write_unlock_bh(&idev->lock);
		spin_lock_bh(&ifa->lock);

		if (ifa->ifpub) {
			in6_ifa_put(ifa->ifpub);
			ifa->ifpub = NULL;
		}
		spin_unlock_bh(&ifa->lock);
		in6_ifa_put(ifa);
		write_lock_bh(&idev->lock);
	}
3076

3077 3078 3079
	while (!list_empty(&idev->addr_list)) {
		ifa = list_first_entry(&idev->addr_list,
				       struct inet6_ifaddr, if_list);
3080
		addrconf_del_dad_work(ifa);
3081

3082
		list_del(&ifa->if_list);
3083

3084
		write_unlock_bh(&idev->lock);
3085

3086 3087 3088 3089
		spin_lock_bh(&ifa->state_lock);
		state = ifa->state;
		ifa->state = INET6_IFADDR_STATE_DEAD;
		spin_unlock_bh(&ifa->state_lock);
3090

3091 3092
		if (state != INET6_IFADDR_STATE_DEAD) {
			__ipv6_ifa_notify(RTM_DELADDR, ifa);
3093
			inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3094
		}
3095
		in6_ifa_put(ifa);
3096

3097 3098
		write_lock_bh(&idev->lock);
	}
3099

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	write_unlock_bh(&idev->lock);

3102 3103 3104
	/* Step 5: Discard anycast and multicast list */
	if (how) {
		ipv6_ac_destroy_dev(idev);
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3105
		ipv6_mc_destroy_dev(idev);
3106
	} else {
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3107
		ipv6_mc_down(idev);
3108
	}
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3109 3110

	idev->tstamp = jiffies;
3111

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Stephen Hemminger committed
3112
	/* Last: Shot the device (if unregistered) */
3113
	if (how) {
3114
		addrconf_sysctl_unregister(idev);
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3115 3116 3117 3118 3119 3120 3121 3122 3123
		neigh_parms_release(&nd_tbl, idev->nd_parms);
		neigh_ifdown(&nd_tbl, dev);
		in6_dev_put(idev);
	}
	return 0;
}

static void addrconf_rs_timer(unsigned long data)
{
3124
	struct inet6_dev *idev = (struct inet6_dev *)data;
3125
	struct net_device *dev = idev->dev;
3126
	struct in6_addr lladdr;
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3127

3128
	write_lock(&idev->lock);
3129
	if (idev->dead || !(idev->if_flags & IF_READY))
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3130 3131
		goto out;

3132
	if (!ipv6_accept_ra(idev))
3133 3134 3135 3136
		goto out;

	/* Announcement received after solicitation was sent */
	if (idev->if_flags & IF_RA_RCVD)
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3137 3138
		goto out;

3139
	if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3140 3141 3142
		write_unlock(&idev->lock);
		if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
			ndisc_send_rs(dev, &lladdr,
3143 3144
				      &in6addr_linklocal_allrouters);
		else
3145
			goto put;
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3146

3147
		write_lock(&idev->lock);
3148 3149 3150 3151 3152
		/* The wait after the last probe can be shorter */
		addrconf_mod_rs_timer(idev, (idev->rs_probes ==
					     idev->cnf.rtr_solicits) ?
				      idev->cnf.rtr_solicit_delay :
				      idev->cnf.rtr_solicit_interval);
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3153 3154 3155 3156 3157
	} else {
		/*
		 * Note: we do not support deprecated "all on-link"
		 * assumption any longer.
		 */
3158
		pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
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3159 3160 3161
	}

out:
3162
	write_unlock(&idev->lock);
3163
put:
3164
	in6_dev_put(idev);
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3165 3166 3167 3168 3169
}

/*
 *	Duplicate Address Detection
 */
3170 3171 3172 3173 3174
static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
{
	unsigned long rand_num;
	struct inet6_dev *idev = ifp->idev;

3175 3176 3177
	if (ifp->flags & IFA_F_OPTIMISTIC)
		rand_num = 0;
	else
3178
		rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3179

3180
	ifp->dad_probes = idev->cnf.dad_transmits;
3181
	addrconf_mod_dad_work(ifp, rand_num);
3182 3183
}

3184
static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
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3185 3186 3187 3188 3189 3190
{
	struct inet6_dev *idev = ifp->idev;
	struct net_device *dev = idev->dev;

	addrconf_join_solict(dev, &ifp->addr);

3191
	prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
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3192 3193

	read_lock_bh(&idev->lock);
3194
	spin_lock(&ifp->lock);
3195
	if (ifp->state == INET6_IFADDR_STATE_DEAD)
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3196 3197 3198
		goto out;

	if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3199
	    idev->cnf.accept_dad < 1 ||
3200 3201
	    !(ifp->flags&IFA_F_TENTATIVE) ||
	    ifp->flags & IFA_F_NODAD) {
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3202
		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3203
		spin_unlock(&ifp->lock);
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3204 3205 3206 3207 3208 3209
		read_unlock_bh(&idev->lock);

		addrconf_dad_completed(ifp);
		return;
	}

3210
	if (!(idev->if_flags & IF_READY)) {
3211
		spin_unlock(&ifp->lock);
3212
		read_unlock_bh(&idev->lock);
3213
		/*
3214
		 * If the device is not ready:
3215 3216 3217 3218
		 * - keep it tentative if it is a permanent address.
		 * - otherwise, kill it.
		 */
		in6_ifa_hold(ifp);
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Brian Haley committed
3219
		addrconf_dad_stop(ifp, 0);
3220
		return;
3221
	}
3222 3223 3224 3225 3226

	/*
	 * Optimistic nodes can start receiving
	 * Frames right away
	 */
3227
	if (ifp->flags & IFA_F_OPTIMISTIC)
3228 3229
		ip6_ins_rt(ifp->rt);

3230
	addrconf_dad_kick(ifp);
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3231
out:
3232
	spin_unlock(&ifp->lock);
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3233 3234 3235
	read_unlock_bh(&idev->lock);
}

3236
static void addrconf_dad_start(struct inet6_ifaddr *ifp)
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3237
{
3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255
	bool begin_dad = false;

	spin_lock_bh(&ifp->state_lock);
	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
		ifp->state = INET6_IFADDR_STATE_PREDAD;
		begin_dad = true;
	}
	spin_unlock_bh(&ifp->state_lock);

	if (begin_dad)
		addrconf_mod_dad_work(ifp, 0);
}

static void addrconf_dad_work(struct work_struct *w)
{
	struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
						struct inet6_ifaddr,
						dad_work);
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3256 3257 3258
	struct inet6_dev *idev = ifp->idev;
	struct in6_addr mcaddr;

3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280
	enum {
		DAD_PROCESS,
		DAD_BEGIN,
		DAD_ABORT,
	} action = DAD_PROCESS;

	rtnl_lock();

	spin_lock_bh(&ifp->state_lock);
	if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
		action = DAD_BEGIN;
		ifp->state = INET6_IFADDR_STATE_DAD;
	} else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
		action = DAD_ABORT;
		ifp->state = INET6_IFADDR_STATE_POSTDAD;
	}
	spin_unlock_bh(&ifp->state_lock);

	if (action == DAD_BEGIN) {
		addrconf_dad_begin(ifp);
		goto out;
	} else if (action == DAD_ABORT) {
3281
		in6_ifa_hold(ifp);
3282 3283 3284 3285
		addrconf_dad_stop(ifp, 1);
		goto out;
	}

3286
	if (!ifp->dad_probes && addrconf_dad_end(ifp))
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Herbert Xu committed
3287 3288
		goto out;

3289
	write_lock_bh(&idev->lock);
3290
	if (idev->dead || !(idev->if_flags & IF_READY)) {
3291
		write_unlock_bh(&idev->lock);
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Linus Torvalds committed
3292 3293
		goto out;
	}
3294 3295

	spin_lock(&ifp->lock);
3296 3297
	if (ifp->state == INET6_IFADDR_STATE_DEAD) {
		spin_unlock(&ifp->lock);
3298
		write_unlock_bh(&idev->lock);
3299 3300 3301
		goto out;
	}

3302
	if (ifp->dad_probes == 0) {
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3303 3304 3305 3306
		/*
		 * DAD was successful
		 */

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3307
		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3308
		spin_unlock(&ifp->lock);
3309
		write_unlock_bh(&idev->lock);
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Linus Torvalds committed
3310 3311 3312 3313 3314 3315

		addrconf_dad_completed(ifp);

		goto out;
	}

3316
	ifp->dad_probes--;
3317 3318
	addrconf_mod_dad_work(ifp,
			      NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3319
	spin_unlock(&ifp->lock);
3320
	write_unlock_bh(&idev->lock);
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3321 3322 3323

	/* send a neighbour solicitation for our addr */
	addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3324
	ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
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3325 3326
out:
	in6_ifa_put(ifp);
3327
	rtnl_unlock();
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3328 3329
}

3330 3331 3332 3333 3334 3335
/* ifp->idev must be at least read locked */
static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
{
	struct inet6_ifaddr *ifpiter;
	struct inet6_dev *idev = ifp->idev;

3336 3337 3338
	list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
		if (ifpiter->scope > IFA_LINK)
			break;
3339 3340 3341 3342 3343 3344 3345 3346 3347
		if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
		    (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
				       IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
		    IFA_F_PERMANENT)
			return false;
	}
	return true;
}

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3348 3349
static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
{
3350
	struct net_device *dev = ifp->idev->dev;
3351
	struct in6_addr lladdr;
3352
	bool send_rs, send_mld;
3353

3354
	addrconf_del_dad_work(ifp);
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3355 3356 3357 3358 3359 3360 3361

	/*
	 *	Configure the address for reception. Now it is valid.
	 */

	ipv6_ifa_notify(RTM_NEWADDR, ifp);

3362 3363
	/* If added prefix is link local and we are prepared to process
	   router advertisements, start sending router solicitations.
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3364 3365
	 */

3366
	read_lock_bh(&ifp->idev->lock);
3367
	send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3368 3369
	send_rs = send_mld &&
		  ipv6_accept_ra(ifp->idev) &&
3370
		  ifp->idev->cnf.rtr_solicits > 0 &&
3371
		  (dev->flags&IFF_LOOPBACK) == 0;
3372 3373
	read_unlock_bh(&ifp->idev->lock);

3374 3375 3376 3377 3378 3379
	/* While dad is in progress mld report's source address is in6_addrany.
	 * Resend with proper ll now.
	 */
	if (send_mld)
		ipv6_mc_dad_complete(ifp->idev);

3380
	if (send_rs) {
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3381 3382 3383 3384 3385
		/*
		 *	If a host as already performed a random delay
		 *	[...] as part of DAD [...] there is no need
		 *	to delay again before sending the first RS
		 */
3386
		if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3387
			return;
3388
		ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
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Linus Torvalds committed
3389

3390 3391 3392
		write_lock_bh(&ifp->idev->lock);
		spin_lock(&ifp->lock);
		ifp->idev->rs_probes = 1;
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Linus Torvalds committed
3393
		ifp->idev->if_flags |= IF_RS_SENT;
3394 3395 3396 3397
		addrconf_mod_rs_timer(ifp->idev,
				      ifp->idev->cnf.rtr_solicit_interval);
		spin_unlock(&ifp->lock);
		write_unlock_bh(&ifp->idev->lock);
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Linus Torvalds committed
3398 3399 3400
	}
}

3401 3402
static void addrconf_dad_run(struct inet6_dev *idev)
{
3403 3404 3405
	struct inet6_ifaddr *ifp;

	read_lock_bh(&idev->lock);
3406
	list_for_each_entry(ifp, &idev->addr_list, if_list) {
3407
		spin_lock(&ifp->lock);
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Herbert Xu committed
3408 3409 3410
		if (ifp->flags & IFA_F_TENTATIVE &&
		    ifp->state == INET6_IFADDR_STATE_DAD)
			addrconf_dad_kick(ifp);
3411
		spin_unlock(&ifp->lock);
3412 3413 3414 3415
	}
	read_unlock_bh(&idev->lock);
}

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Linus Torvalds committed
3416 3417
#ifdef CONFIG_PROC_FS
struct if6_iter_state {
3418
	struct seq_net_private p;
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3419
	int bucket;
3420
	int offset;
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3421 3422
};

3423
static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
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3424 3425 3426
{
	struct inet6_ifaddr *ifa = NULL;
	struct if6_iter_state *state = seq->private;
3427
	struct net *net = seq_file_net(seq);
3428
	int p = 0;
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Linus Torvalds committed
3429

3430 3431 3432 3433 3434 3435 3436
	/* initial bucket if pos is 0 */
	if (pos == 0) {
		state->bucket = 0;
		state->offset = 0;
	}

	for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3437
		hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3438
					 addr_lst) {
3439 3440
			if (!net_eq(dev_net(ifa->idev->dev), net))
				continue;
3441 3442 3443 3444 3445 3446
			/* sync with offset */
			if (p < state->offset) {
				p++;
				continue;
			}
			state->offset++;
3447
			return ifa;
3448 3449 3450 3451 3452
		}

		/* prepare for next bucket */
		state->offset = 0;
		p = 0;
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Linus Torvalds committed
3453
	}
3454
	return NULL;
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3455 3456
}

3457 3458
static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
					 struct inet6_ifaddr *ifa)
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Linus Torvalds committed
3459 3460
{
	struct if6_iter_state *state = seq->private;
3461
	struct net *net = seq_file_net(seq);
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Linus Torvalds committed
3462

3463
	hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3464 3465
		if (!net_eq(dev_net(ifa->idev->dev), net))
			continue;
3466
		state->offset++;
3467
		return ifa;
3468
	}
3469

3470
	while (++state->bucket < IN6_ADDR_HSIZE) {
3471
		state->offset = 0;
3472
		hlist_for_each_entry_rcu_bh(ifa,
3473
				     &inet6_addr_lst[state->bucket], addr_lst) {
3474 3475
			if (!net_eq(dev_net(ifa->idev->dev), net))
				continue;
3476
			state->offset++;
3477
			return ifa;
3478
		}
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Linus Torvalds committed
3479
	}
3480

3481
	return NULL;
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3482 3483 3484
}

static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
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Eric Dumazet committed
3485
	__acquires(rcu_bh)
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Linus Torvalds committed
3486
{
3487
	rcu_read_lock_bh();
3488
	return if6_get_first(seq, *pos);
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3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500
}

static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct inet6_ifaddr *ifa;

	ifa = if6_get_next(seq, v);
	++*pos;
	return ifa;
}

static void if6_seq_stop(struct seq_file *seq, void *v)
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Eric Dumazet committed
3501
	__releases(rcu_bh)
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3502
{
3503
	rcu_read_unlock_bh();
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3504 3505 3506 3507 3508
}

static int if6_seq_show(struct seq_file *seq, void *v)
{
	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3509
	seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3510
		   &ifp->addr,
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3511 3512 3513
		   ifp->idev->dev->ifindex,
		   ifp->prefix_len,
		   ifp->scope,
3514
		   (u8) ifp->flags,
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Linus Torvalds committed
3515 3516 3517 3518
		   ifp->idev->dev->name);
	return 0;
}

3519
static const struct seq_operations if6_seq_ops = {
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3520 3521 3522 3523 3524 3525 3526 3527
	.start	= if6_seq_start,
	.next	= if6_seq_next,
	.show	= if6_seq_show,
	.stop	= if6_seq_stop,
};

static int if6_seq_open(struct inode *inode, struct file *file)
{
3528 3529
	return seq_open_net(inode, file, &if6_seq_ops,
			    sizeof(struct if6_iter_state));
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3530 3531
}

3532
static const struct file_operations if6_fops = {
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3533 3534 3535 3536
	.owner		= THIS_MODULE,
	.open		= if6_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
3537
	.release	= seq_release_net,
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Linus Torvalds committed
3538 3539
};

3540
static int __net_init if6_proc_net_init(struct net *net)
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Linus Torvalds committed
3541
{
3542
	if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
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Linus Torvalds committed
3543 3544 3545 3546
		return -ENOMEM;
	return 0;
}

3547
static void __net_exit if6_proc_net_exit(struct net *net)
3548
{
3549
	remove_proc_entry("if_inet6", net->proc_net);
3550 3551 3552
}

static struct pernet_operations if6_proc_net_ops = {
3553 3554
	.init = if6_proc_net_init,
	.exit = if6_proc_net_exit,
3555 3556 3557 3558 3559 3560 3561
};

int __init if6_proc_init(void)
{
	return register_pernet_subsys(&if6_proc_net_ops);
}

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3562 3563
void if6_proc_exit(void)
{
3564
	unregister_pernet_subsys(&if6_proc_net_ops);
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3565 3566 3567
}
#endif	/* CONFIG_PROC_FS */

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Amerigo Wang committed
3568
#if IS_ENABLED(CONFIG_IPV6_MIP6)
3569
/* Check if address is a home address configured on any interface. */
3570
int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3571 3572
{
	int ret = 0;
3573
	struct inet6_ifaddr *ifp = NULL;
3574
	unsigned int hash = inet6_addr_hash(addr);
3575

3576
	rcu_read_lock_bh();
3577
	hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3578
		if (!net_eq(dev_net(ifp->idev->dev), net))
3579
			continue;
3580
		if (ipv6_addr_equal(&ifp->addr, addr) &&
3581 3582 3583 3584 3585
		    (ifp->flags & IFA_F_HOMEADDRESS)) {
			ret = 1;
			break;
		}
	}
3586
	rcu_read_unlock_bh();
3587 3588 3589 3590
	return ret;
}
#endif

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3591 3592 3593 3594
/*
 *	Periodic address status verification
 */

3595
static void addrconf_verify_rtnl(void)
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3596
{
3597
	unsigned long now, next, next_sec, next_sched;
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3598 3599 3600
	struct inet6_ifaddr *ifp;
	int i;

3601 3602
	ASSERT_RTNL();

3603
	rcu_read_lock_bh();
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Linus Torvalds committed
3604
	now = jiffies;
3605
	next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
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Linus Torvalds committed
3606

3607
	cancel_delayed_work(&addr_chk_work);
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Linus Torvalds committed
3608

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Stephen Hemminger committed
3609
	for (i = 0; i < IN6_ADDR_HSIZE; i++) {
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3610
restart:
3611
		hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
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3612 3613
			unsigned long age;

3614 3615 3616 3617 3618 3619
			/* When setting preferred_lft to a value not zero or
			 * infinity, while valid_lft is infinity
			 * IFA_F_PERMANENT has a non-infinity life time.
			 */
			if ((ifp->flags & IFA_F_PERMANENT) &&
			    (ifp->prefered_lft == INFINITY_LIFE_TIME))
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3620 3621 3622
				continue;

			spin_lock(&ifp->lock);
3623 3624
			/* We try to batch several events at once. */
			age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
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3625

3626 3627
			if (ifp->valid_lft != INFINITY_LIFE_TIME &&
			    age >= ifp->valid_lft) {
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3628 3629 3630 3631
				spin_unlock(&ifp->lock);
				in6_ifa_hold(ifp);
				ipv6_del_addr(ifp);
				goto restart;
3632 3633 3634
			} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
				spin_unlock(&ifp->lock);
				continue;
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3635
			} else if (age >= ifp->prefered_lft) {
3636
				/* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
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3637 3638 3639 3640 3641 3642 3643
				int deprecate = 0;

				if (!(ifp->flags&IFA_F_DEPRECATED)) {
					deprecate = 1;
					ifp->flags |= IFA_F_DEPRECATED;
				}

3644 3645
				if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
				    (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
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3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658
					next = ifp->tstamp + ifp->valid_lft * HZ;

				spin_unlock(&ifp->lock);

				if (deprecate) {
					in6_ifa_hold(ifp);

					ipv6_ifa_notify(0, ifp);
					in6_ifa_put(ifp);
					goto restart;
				}
			} else if ((ifp->flags&IFA_F_TEMPORARY) &&
				   !(ifp->flags&IFA_F_TENTATIVE)) {
3659 3660
				unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
					ifp->idev->cnf.dad_transmits *
3661
					NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3662

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3663 3664 3665 3666 3667 3668 3669 3670 3671
				if (age >= ifp->prefered_lft - regen_advance) {
					struct inet6_ifaddr *ifpub = ifp->ifpub;
					if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
						next = ifp->tstamp + ifp->prefered_lft * HZ;
					if (!ifp->regen_count && ifpub) {
						ifp->regen_count++;
						in6_ifa_hold(ifp);
						in6_ifa_hold(ifpub);
						spin_unlock(&ifp->lock);
3672

3673 3674 3675
						spin_lock(&ifpub->lock);
						ifpub->regen_count = 0;
						spin_unlock(&ifpub->lock);
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3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692
						ipv6_create_tempaddr(ifpub, ifp);
						in6_ifa_put(ifpub);
						in6_ifa_put(ifp);
						goto restart;
					}
				} else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
					next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
				spin_unlock(&ifp->lock);
			} else {
				/* ifp->prefered_lft <= ifp->valid_lft */
				if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
					next = ifp->tstamp + ifp->prefered_lft * HZ;
				spin_unlock(&ifp->lock);
			}
		}
	}

3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703
	next_sec = round_jiffies_up(next);
	next_sched = next;

	/* If rounded timeout is accurate enough, accept it. */
	if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
		next_sched = next_sec;

	/* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
	if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
		next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;

3704 3705
	ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
	      now, next, next_sec, next_sched);
3706
	mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3707
	rcu_read_unlock_bh();
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3708 3709
}

3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721
static void addrconf_verify_work(struct work_struct *w)
{
	rtnl_lock();
	addrconf_verify_rtnl();
	rtnl_unlock();
}

static void addrconf_verify(void)
{
	mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
}

3722 3723
static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
				     struct in6_addr **peer_pfx)
3724 3725 3726
{
	struct in6_addr *pfx = NULL;

3727 3728
	*peer_pfx = NULL;

3729 3730 3731 3732 3733
	if (addr)
		pfx = nla_data(addr);

	if (local) {
		if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3734 3735
			*peer_pfx = pfx;
		pfx = nla_data(local);
3736 3737 3738 3739 3740
	}

	return pfx;
}

3741
static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3742 3743 3744
	[IFA_ADDRESS]		= { .len = sizeof(struct in6_addr) },
	[IFA_LOCAL]		= { .len = sizeof(struct in6_addr) },
	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
3745
	[IFA_FLAGS]		= { .len = sizeof(u32) },
3746 3747
};

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3748
static int
3749
inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
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3750
{
3751
	struct net *net = sock_net(skb->sk);
3752 3753
	struct ifaddrmsg *ifm;
	struct nlattr *tb[IFA_MAX+1];
3754
	struct in6_addr *pfx, *peer_pfx;
3755
	u32 ifa_flags;
3756
	int err;
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3757

3758 3759 3760 3761 3762
	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
	if (err < 0)
		return err;

	ifm = nlmsg_data(nlh);
3763
	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
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3764 3765 3766
	if (pfx == NULL)
		return -EINVAL;

3767 3768 3769 3770 3771 3772 3773
	ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;

	/* We ignore other flags so far. */
	ifa_flags &= IFA_F_MANAGETEMPADDR;

	return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
			      ifm->ifa_prefixlen);
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3774 3775
}

3776
static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3777
			     u32 prefered_lft, u32 valid_lft)
3778
{
3779 3780
	u32 flags;
	clock_t expires;
3781
	unsigned long timeout;
3782
	bool was_managetempaddr;
3783
	bool had_prefixroute;
3784

3785 3786
	ASSERT_RTNL();

3787 3788 3789
	if (!valid_lft || (prefered_lft > valid_lft))
		return -EINVAL;

3790 3791 3792 3793
	if (ifa_flags & IFA_F_MANAGETEMPADDR &&
	    (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
		return -EINVAL;

3794 3795 3796 3797
	timeout = addrconf_timeout_fixup(valid_lft, HZ);
	if (addrconf_finite_timeout(timeout)) {
		expires = jiffies_to_clock_t(timeout * HZ);
		valid_lft = timeout;
3798
		flags = RTF_EXPIRES;
3799 3800 3801 3802
	} else {
		expires = 0;
		flags = 0;
		ifa_flags |= IFA_F_PERMANENT;
3803
	}
3804

3805 3806 3807 3808 3809 3810
	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
	if (addrconf_finite_timeout(timeout)) {
		if (timeout == 0)
			ifa_flags |= IFA_F_DEPRECATED;
		prefered_lft = timeout;
	}
3811 3812

	spin_lock_bh(&ifp->lock);
3813
	was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3814 3815
	had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
			  !(ifp->flags & IFA_F_NOPREFIXROUTE);
3816
	ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3817 3818
			IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
			IFA_F_NOPREFIXROUTE);
3819
	ifp->flags |= ifa_flags;
3820 3821 3822 3823 3824 3825 3826 3827
	ifp->tstamp = jiffies;
	ifp->valid_lft = valid_lft;
	ifp->prefered_lft = prefered_lft;

	spin_unlock_bh(&ifp->lock);
	if (!(ifp->flags&IFA_F_TENTATIVE))
		ipv6_ifa_notify(0, ifp);

3828 3829 3830
	if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
				      expires, flags);
3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842
	} else if (had_prefixroute) {
		enum cleanup_prefix_rt_t action;
		unsigned long rt_expires;

		write_lock_bh(&ifp->idev->lock);
		action = check_cleanup_prefix_route(ifp, &rt_expires);
		write_unlock_bh(&ifp->idev->lock);

		if (action != CLEANUP_PREFIX_RT_NOP) {
			cleanup_prefix_route(ifp, rt_expires,
				action == CLEANUP_PREFIX_RT_DEL);
		}
3843
	}
3844 3845 3846 3847 3848 3849 3850 3851

	if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
		if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
			valid_lft = prefered_lft = 0;
		manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
				 !was_managetempaddr, jiffies);
	}

3852
	addrconf_verify_rtnl();
3853 3854 3855 3856

	return 0;
}

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3857
static int
3858
inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
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3859
{
3860
	struct net *net = sock_net(skb->sk);
3861 3862
	struct ifaddrmsg *ifm;
	struct nlattr *tb[IFA_MAX+1];
3863
	struct in6_addr *pfx, *peer_pfx;
3864 3865
	struct inet6_ifaddr *ifa;
	struct net_device *dev;
3866
	u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3867
	u32 ifa_flags;
3868
	int err;
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3869

3870 3871 3872 3873 3874
	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
	if (err < 0)
		return err;

	ifm = nlmsg_data(nlh);
3875
	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
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3876 3877 3878
	if (pfx == NULL)
		return -EINVAL;

3879
	if (tb[IFA_CACHEINFO]) {
3880
		struct ifa_cacheinfo *ci;
3881 3882

		ci = nla_data(tb[IFA_CACHEINFO]);
3883
		valid_lft = ci->ifa_valid;
3884 3885 3886 3887
		preferred_lft = ci->ifa_prefered;
	} else {
		preferred_lft = INFINITY_LIFE_TIME;
		valid_lft = INFINITY_LIFE_TIME;
3888 3889
	}

3890
	dev =  __dev_get_by_index(net, ifm->ifa_index);
3891 3892 3893
	if (dev == NULL)
		return -ENODEV;

3894 3895
	ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;

3896
	/* We ignore other flags so far. */
3897 3898
	ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
		     IFA_F_NOPREFIXROUTE;
3899

3900
	ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3901 3902 3903
	if (ifa == NULL) {
		/*
		 * It would be best to check for !NLM_F_CREATE here but
3904
		 * userspace already relies on not having to provide this.
3905
		 */
3906
		return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3907 3908
				      ifm->ifa_prefixlen, ifa_flags,
				      preferred_lft, valid_lft);
3909 3910
	}

3911 3912 3913 3914
	if (nlh->nlmsg_flags & NLM_F_EXCL ||
	    !(nlh->nlmsg_flags & NLM_F_REPLACE))
		err = -EEXIST;
	else
3915
		err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3916 3917 3918 3919

	in6_ifa_put(ifa);

	return err;
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3920 3921
}

3922
static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934
			  u8 scope, int ifindex)
{
	struct ifaddrmsg *ifm;

	ifm = nlmsg_data(nlh);
	ifm->ifa_family = AF_INET6;
	ifm->ifa_prefixlen = prefixlen;
	ifm->ifa_flags = flags;
	ifm->ifa_scope = scope;
	ifm->ifa_index = ifindex;
}

3935 3936 3937 3938 3939
static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
			 unsigned long tstamp, u32 preferred, u32 valid)
{
	struct ifa_cacheinfo ci;

3940 3941
	ci.cstamp = cstamp_delta(cstamp);
	ci.tstamp = cstamp_delta(tstamp);
3942 3943 3944 3945 3946 3947
	ci.ifa_prefered = preferred;
	ci.ifa_valid = valid;

	return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
}

3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959
static inline int rt_scope(int ifa_scope)
{
	if (ifa_scope & IFA_HOST)
		return RT_SCOPE_HOST;
	else if (ifa_scope & IFA_LINK)
		return RT_SCOPE_LINK;
	else if (ifa_scope & IFA_SITE)
		return RT_SCOPE_SITE;
	else
		return RT_SCOPE_UNIVERSE;
}

3960 3961
static inline int inet6_ifaddr_msgsize(void)
{
3962
	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3963
	       + nla_total_size(16) /* IFA_LOCAL */
3964
	       + nla_total_size(16) /* IFA_ADDRESS */
3965 3966
	       + nla_total_size(sizeof(struct ifa_cacheinfo))
	       + nla_total_size(4)  /* IFA_FLAGS */;
3967
}
3968

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3969
static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3970
			     u32 portid, u32 seq, int event, unsigned int flags)
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3971 3972
{
	struct nlmsghdr  *nlh;
3973
	u32 preferred, valid;
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3974

3975
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3976
	if (nlh == NULL)
3977
		return -EMSGSIZE;
3978

3979 3980 3981
	put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
		      ifa->idev->dev->ifindex);

3982 3983
	if (!((ifa->flags&IFA_F_PERMANENT) &&
	      (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3984 3985 3986
		preferred = ifa->prefered_lft;
		valid = ifa->valid_lft;
		if (preferred != INFINITY_LIFE_TIME) {
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3987
			long tval = (jiffies - ifa->tstamp)/HZ;
3988 3989 3990 3991
			if (preferred > tval)
				preferred -= tval;
			else
				preferred = 0;
3992 3993 3994 3995 3996 3997
			if (valid != INFINITY_LIFE_TIME) {
				if (valid > tval)
					valid -= tval;
				else
					valid = 0;
			}
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3998 3999
		}
	} else {
4000 4001 4002 4003
		preferred = INFINITY_LIFE_TIME;
		valid = INFINITY_LIFE_TIME;
	}

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Cong Wang committed
4004
	if (!ipv6_addr_any(&ifa->peer_addr)) {
4005 4006 4007 4008 4009 4010 4011 4012 4013
		if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
		    nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
			goto error;
	} else
		if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
			goto error;

	if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
		goto error;
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4014

4015 4016 4017
	if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
		goto error;

4018
	return nlmsg_end(skb, nlh);
4019 4020 4021 4022

error:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
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4023 4024 4025
}

static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4026
				u32 portid, u32 seq, int event, u16 flags)
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4027 4028
{
	struct nlmsghdr  *nlh;
4029 4030 4031 4032 4033
	u8 scope = RT_SCOPE_UNIVERSE;
	int ifindex = ifmca->idev->dev->ifindex;

	if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
		scope = RT_SCOPE_SITE;
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4034

4035
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4036
	if (nlh == NULL)
4037
		return -EMSGSIZE;
4038

4039 4040 4041
	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
	if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
	    put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4042 4043 4044 4045
			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
		nlmsg_cancel(skb, nlh);
		return -EMSGSIZE;
	}
4046

4047
	return nlmsg_end(skb, nlh);
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4048 4049 4050
}

static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4051
				u32 portid, u32 seq, int event, unsigned int flags)
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4052 4053
{
	struct nlmsghdr  *nlh;
4054 4055 4056 4057 4058
	u8 scope = RT_SCOPE_UNIVERSE;
	int ifindex = ifaca->aca_idev->dev->ifindex;

	if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
		scope = RT_SCOPE_SITE;
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4059

4060
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4061
	if (nlh == NULL)
4062
		return -EMSGSIZE;
4063

4064 4065 4066
	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
	if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
	    put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4067 4068 4069 4070
			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
		nlmsg_cancel(skb, nlh);
		return -EMSGSIZE;
	}
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4071

4072
	return nlmsg_end(skb, nlh);
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4073 4074
}

4075
enum addr_type_t {
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4076 4077 4078 4079 4080
	UNICAST_ADDR,
	MULTICAST_ADDR,
	ANYCAST_ADDR,
};

4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092
/* called with rcu_read_lock() */
static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
			  struct netlink_callback *cb, enum addr_type_t type,
			  int s_ip_idx, int *p_ip_idx)
{
	struct ifmcaddr6 *ifmca;
	struct ifacaddr6 *ifaca;
	int err = 1;
	int ip_idx = *p_ip_idx;

	read_lock_bh(&idev->lock);
	switch (type) {
4093 4094 4095
	case UNICAST_ADDR: {
		struct inet6_ifaddr *ifa;

4096
		/* unicast address incl. temp addr */
4097 4098
		list_for_each_entry(ifa, &idev->addr_list, if_list) {
			if (++ip_idx < s_ip_idx)
4099 4100
				continue;
			err = inet6_fill_ifaddr(skb, ifa,
4101
						NETLINK_CB(cb->skb).portid,
4102 4103 4104 4105 4106
						cb->nlh->nlmsg_seq,
						RTM_NEWADDR,
						NLM_F_MULTI);
			if (err <= 0)
				break;
4107
			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4108 4109
		}
		break;
4110
	}
4111 4112 4113 4114 4115 4116 4117
	case MULTICAST_ADDR:
		/* multicast address */
		for (ifmca = idev->mc_list; ifmca;
		     ifmca = ifmca->next, ip_idx++) {
			if (ip_idx < s_ip_idx)
				continue;
			err = inet6_fill_ifmcaddr(skb, ifmca,
4118
						  NETLINK_CB(cb->skb).portid,
4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132
						  cb->nlh->nlmsg_seq,
						  RTM_GETMULTICAST,
						  NLM_F_MULTI);
			if (err <= 0)
				break;
		}
		break;
	case ANYCAST_ADDR:
		/* anycast address */
		for (ifaca = idev->ac_list; ifaca;
		     ifaca = ifaca->aca_next, ip_idx++) {
			if (ip_idx < s_ip_idx)
				continue;
			err = inet6_fill_ifacaddr(skb, ifaca,
4133
						  NETLINK_CB(cb->skb).portid,
4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148
						  cb->nlh->nlmsg_seq,
						  RTM_GETANYCAST,
						  NLM_F_MULTI);
			if (err <= 0)
				break;
		}
		break;
	default:
		break;
	}
	read_unlock_bh(&idev->lock);
	*p_ip_idx = ip_idx;
	return err;
}

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4149 4150 4151
static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
			   enum addr_type_t type)
{
4152 4153
	struct net *net = sock_net(skb->sk);
	int h, s_h;
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4154 4155 4156
	int idx, ip_idx;
	int s_idx, s_ip_idx;
	struct net_device *dev;
4157 4158
	struct inet6_dev *idev;
	struct hlist_head *head;
4159

4160 4161 4162
	s_h = cb->args[0];
	s_idx = idx = cb->args[1];
	s_ip_idx = ip_idx = cb->args[2];
4163

4164
	rcu_read_lock();
4165
	cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4166 4167 4168
	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
		idx = 0;
		head = &net->dev_index_head[h];
4169
		hlist_for_each_entry_rcu(dev, head, index_hlist) {
4170 4171
			if (idx < s_idx)
				goto cont;
4172
			if (h > s_h || idx > s_idx)
4173 4174
				s_ip_idx = 0;
			ip_idx = 0;
4175 4176
			idev = __in6_dev_get(dev);
			if (!idev)
4177 4178 4179 4180 4181
				goto cont;

			if (in6_dump_addrs(idev, skb, cb, type,
					   s_ip_idx, &ip_idx) <= 0)
				goto done;
4182
cont:
4183 4184
			idx++;
		}
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4185
	}
4186 4187 4188 4189 4190 4191
done:
	rcu_read_unlock();
	cb->args[0] = h;
	cb->args[1] = idx;
	cb->args[2] = ip_idx;

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	return skb->len;
}

static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
	enum addr_type_t type = UNICAST_ADDR;
4198

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	return inet6_dump_addr(skb, cb, type);
}

static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
	enum addr_type_t type = MULTICAST_ADDR;
4205

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	return inet6_dump_addr(skb, cb, type);
}


static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
	enum addr_type_t type = ANYCAST_ADDR;
4213

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4214 4215 4216
	return inet6_dump_addr(skb, cb, type);
}

4217
static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4218
{
4219
	struct net *net = sock_net(in_skb->sk);
4220 4221
	struct ifaddrmsg *ifm;
	struct nlattr *tb[IFA_MAX+1];
4222
	struct in6_addr *addr = NULL, *peer;
4223 4224 4225 4226 4227
	struct net_device *dev = NULL;
	struct inet6_ifaddr *ifa;
	struct sk_buff *skb;
	int err;

4228 4229 4230 4231
	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
	if (err < 0)
		goto errout;

4232
	addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4233 4234 4235
	if (addr == NULL) {
		err = -EINVAL;
		goto errout;
4236 4237
	}

4238
	ifm = nlmsg_data(nlh);
4239
	if (ifm->ifa_index)
4240
		dev = __dev_get_by_index(net, ifm->ifa_index);
4241

4242 4243
	ifa = ipv6_get_ifaddr(net, addr, dev, 1);
	if (!ifa) {
4244 4245 4246
		err = -EADDRNOTAVAIL;
		goto errout;
	}
4247

4248 4249
	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
	if (!skb) {
4250
		err = -ENOBUFS;
4251
		goto errout_ifa;
4252 4253
	}

4254
	err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4255
				nlh->nlmsg_seq, RTM_NEWADDR, 0);
4256 4257 4258 4259 4260 4261
	if (err < 0) {
		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout_ifa;
	}
4262
	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4263
errout_ifa:
4264
	in6_ifa_put(ifa);
4265
errout:
4266 4267 4268
	return err;
}

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4269 4270 4271
static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
{
	struct sk_buff *skb;
4272
	struct net *net = dev_net(ifa->idev->dev);
4273
	int err = -ENOBUFS;
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4274

4275
	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4276 4277 4278 4279
	if (skb == NULL)
		goto errout;

	err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4280 4281 4282 4283 4284 4285
	if (err < 0) {
		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
4286 4287
	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
	return;
4288 4289
errout:
	if (err < 0)
4290
		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
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4291 4292
}

4293
static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
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4294 4295
				__s32 *array, int bytes)
{
4296 4297
	BUG_ON(bytes < (DEVCONF_MAX * 4));

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4298 4299 4300 4301 4302 4303 4304 4305 4306
	memset(array, 0, bytes);
	array[DEVCONF_FORWARDING] = cnf->forwarding;
	array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
	array[DEVCONF_MTU6] = cnf->mtu6;
	array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
	array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
	array[DEVCONF_AUTOCONF] = cnf->autoconf;
	array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
	array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4307 4308 4309 4310
	array[DEVCONF_RTR_SOLICIT_INTERVAL] =
		jiffies_to_msecs(cnf->rtr_solicit_interval);
	array[DEVCONF_RTR_SOLICIT_DELAY] =
		jiffies_to_msecs(cnf->rtr_solicit_delay);
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4311
	array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4312 4313 4314 4315
	array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
		jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
	array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
		jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
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4316 4317 4318 4319 4320 4321
	array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
	array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
	array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
	array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
	array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
	array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4322
	array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4323
	array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4324 4325
#ifdef CONFIG_IPV6_ROUTER_PREF
	array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4326 4327
	array[DEVCONF_RTR_PROBE_INTERVAL] =
		jiffies_to_msecs(cnf->rtr_probe_interval);
4328
#ifdef CONFIG_IPV6_ROUTE_INFO
4329 4330
	array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
#endif
4331
#endif
4332
	array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4333
	array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4334 4335 4336
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
	array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
#endif
4337 4338 4339
#ifdef CONFIG_IPV6_MROUTE
	array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
#endif
4340
	array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4341
	array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4342
	array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4343
	array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4344
	array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4345
	array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
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4346 4347
}

4348 4349 4350 4351 4352 4353
static inline size_t inet6_ifla6_size(void)
{
	return nla_total_size(4) /* IFLA_INET6_FLAGS */
	     + nla_total_size(sizeof(struct ifla_cacheinfo))
	     + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
	     + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4354 4355
	     + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
	     + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4356 4357
}

4358 4359 4360 4361 4362 4363 4364
static inline size_t inet6_if_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
	       + nla_total_size(4) /* IFLA_MTU */
	       + nla_total_size(4) /* IFLA_LINK */
4365
	       + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4366
}
4367

4368
static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4369
				      int items, int bytes)
4370 4371 4372 4373 4374 4375 4376 4377
{
	int i;
	int pad = bytes - sizeof(u64) * items;
	BUG_ON(pad < 0);

	/* Use put_unaligned() because stats may not be aligned for u64. */
	put_unaligned(items, &stats[0]);
	for (i = 1; i < items; i++)
4378
		put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4379 4380 4381 4382

	memset(&stats[items], 0, pad);
}

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4383
static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397
				      int items, int bytes, size_t syncpoff)
{
	int i;
	int pad = bytes - sizeof(u64) * items;
	BUG_ON(pad < 0);

	/* Use put_unaligned() because stats may not be aligned for u64. */
	put_unaligned(items, &stats[0]);
	for (i = 1; i < items; i++)
		put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);

	memset(&stats[items], 0, pad);
}

4398 4399 4400
static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
			     int bytes)
{
4401
	switch (attrtype) {
4402
	case IFLA_INET6_STATS:
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WANG Cong committed
4403
		__snmp6_fill_stats64(stats, idev->stats.ipv6,
4404
				     IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4405 4406
		break;
	case IFLA_INET6_ICMP6STATS:
4407
		__snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4408 4409 4410 4411
		break;
	}
}

4412 4413 4414 4415 4416
static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
{
	struct nlattr *nla;
	struct ifla_cacheinfo ci;

4417 4418
	if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
		goto nla_put_failure;
4419
	ci.max_reasm_len = IPV6_MAXPLEN;
4420 4421
	ci.tstamp = cstamp_delta(idev->tstamp);
	ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4422
	ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4423 4424
	if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
		goto nla_put_failure;
4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441
	nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
	if (nla == NULL)
		goto nla_put_failure;
	ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));

	/* XXX - MC not implemented */

	nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
	if (nla == NULL)
		goto nla_put_failure;
	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));

	nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
	if (nla == NULL)
		goto nla_put_failure;
	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));

4442 4443 4444
	nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
	if (nla == NULL)
		goto nla_put_failure;
4445 4446 4447 4448

	if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
		goto nla_put_failure;

4449 4450 4451 4452
	read_lock_bh(&idev->lock);
	memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
	read_unlock_bh(&idev->lock);

4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static size_t inet6_get_link_af_size(const struct net_device *dev)
{
	if (!__in6_dev_get(dev))
		return 0;

	return inet6_ifla6_size();
}

static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
{
	struct inet6_dev *idev = __in6_dev_get(dev);

	if (!idev)
		return -ENODATA;

	if (inet6_fill_ifla6_attrs(skb, idev) < 0)
		return -EMSGSIZE;

	return 0;
}

4480 4481 4482 4483
static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
{
	struct inet6_ifaddr *ifp;
	struct net_device *dev = idev->dev;
4484
	bool update_rs = false;
4485
	struct in6_addr ll_addr;
4486

4487 4488
	ASSERT_RTNL();

4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506
	if (token == NULL)
		return -EINVAL;
	if (ipv6_addr_any(token))
		return -EINVAL;
	if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
		return -EINVAL;
	if (!ipv6_accept_ra(idev))
		return -EINVAL;
	if (idev->cnf.rtr_solicits <= 0)
		return -EINVAL;

	write_lock_bh(&idev->lock);

	BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
	memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);

	write_unlock_bh(&idev->lock);

4507 4508 4509
	if (!idev->dead && (idev->if_flags & IF_READY) &&
	    !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
			     IFA_F_OPTIMISTIC)) {
4510 4511 4512 4513 4514 4515 4516

		/* If we're not ready, then normal ifup will take care
		 * of this. Otherwise, we need to request our rs here.
		 */
		ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
		update_rs = true;
	}
4517 4518

	write_lock_bh(&idev->lock);
4519

4520
	if (update_rs) {
4521
		idev->if_flags |= IF_RS_SENT;
4522 4523 4524
		idev->rs_probes = 1;
		addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
	}
4525 4526 4527 4528

	/* Well, that's kinda nasty ... */
	list_for_each_entry(ifp, &idev->addr_list, if_list) {
		spin_lock(&ifp->lock);
4529
		if (ifp->tokenized) {
4530 4531 4532 4533 4534 4535 4536
			ifp->valid_lft = 0;
			ifp->prefered_lft = 0;
		}
		spin_unlock(&ifp->lock);
	}

	write_unlock_bh(&idev->lock);
4537
	inet6_ifinfo_notify(RTM_NEWLINK, idev);
4538
	addrconf_verify_rtnl();
4539 4540 4541
	return 0;
}

4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557
static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
	[IFLA_INET6_ADDR_GEN_MODE]	= { .type = NLA_U8 },
	[IFLA_INET6_TOKEN]		= { .len = sizeof(struct in6_addr) },
};

static int inet6_validate_link_af(const struct net_device *dev,
				  const struct nlattr *nla)
{
	struct nlattr *tb[IFLA_INET6_MAX + 1];

	if (dev && !__in6_dev_get(dev))
		return -EAFNOSUPPORT;

	return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
}

4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569
static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
{
	int err = -EINVAL;
	struct inet6_dev *idev = __in6_dev_get(dev);
	struct nlattr *tb[IFLA_INET6_MAX + 1];

	if (!idev)
		return -EAFNOSUPPORT;

	if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
		BUG();

4570
	if (tb[IFLA_INET6_TOKEN]) {
4571
		err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584
		if (err)
			return err;
	}

	if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
		u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);

		if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
		    mode != IN6_ADDR_GEN_MODE_NONE)
			return -EINVAL;
		idev->addr_gen_mode = mode;
		err = 0;
	}
4585 4586 4587 4588

	return err;
}

4589
static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4590
			     u32 portid, u32 seq, int event, unsigned int flags)
Linus Torvalds's avatar
Linus Torvalds committed
4591
{
4592 4593 4594 4595 4596
	struct net_device *dev = idev->dev;
	struct ifinfomsg *hdr;
	struct nlmsghdr *nlh;
	void *protoinfo;

4597
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4598
	if (nlh == NULL)
4599
		return -EMSGSIZE;
4600 4601 4602 4603 4604 4605 4606 4607 4608

	hdr = nlmsg_data(nlh);
	hdr->ifi_family = AF_INET6;
	hdr->__ifi_pad = 0;
	hdr->ifi_type = dev->type;
	hdr->ifi_index = dev->ifindex;
	hdr->ifi_flags = dev_get_flags(dev);
	hdr->ifi_change = 0;

4609 4610 4611 4612 4613 4614 4615
	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
	    (dev->addr_len &&
	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
	    (dev->ifindex != dev->iflink &&
	     nla_put_u32(skb, IFLA_LINK, dev->iflink)))
		goto nla_put_failure;
4616 4617 4618
	protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
	if (protoinfo == NULL)
		goto nla_put_failure;
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4619

4620
	if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4621
		goto nla_put_failure;
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4622

4623 4624
	nla_nest_end(skb, protoinfo);
	return nlmsg_end(skb, nlh);
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4625

4626
nla_put_failure:
4627 4628
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
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4629 4630 4631 4632
}

static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
{
4633
	struct net *net = sock_net(skb->sk);
4634
	int h, s_h;
4635
	int idx = 0, s_idx;
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4636 4637
	struct net_device *dev;
	struct inet6_dev *idev;
4638
	struct hlist_head *head;
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4639

4640 4641 4642 4643 4644 4645 4646
	s_h = cb->args[0];
	s_idx = cb->args[1];

	rcu_read_lock();
	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
		idx = 0;
		head = &net->dev_index_head[h];
4647
		hlist_for_each_entry_rcu(dev, head, index_hlist) {
4648 4649 4650 4651 4652 4653
			if (idx < s_idx)
				goto cont;
			idev = __in6_dev_get(dev);
			if (!idev)
				goto cont;
			if (inet6_fill_ifinfo(skb, idev,
4654
					      NETLINK_CB(cb->skb).portid,
4655 4656 4657
					      cb->nlh->nlmsg_seq,
					      RTM_NEWLINK, NLM_F_MULTI) <= 0)
				goto out;
4658
cont:
4659 4660
			idx++;
		}
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4661
	}
4662 4663 4664 4665
out:
	rcu_read_unlock();
	cb->args[1] = idx;
	cb->args[0] = h;
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	return skb->len;
}

void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
{
	struct sk_buff *skb;
4673
	struct net *net = dev_net(idev->dev);
4674
	int err = -ENOBUFS;
4675

4676
	skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4677 4678 4679 4680
	if (skb == NULL)
		goto errout;

	err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4681 4682 4683 4684 4685 4686
	if (err < 0) {
		/* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
4687
	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4688
	return;
4689 4690
errout:
	if (err < 0)
4691
		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
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}

4694 4695 4696 4697 4698 4699
static inline size_t inet6_prefix_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct prefixmsg))
	       + nla_total_size(sizeof(struct in6_addr))
	       + nla_total_size(sizeof(struct prefix_cacheinfo));
}
4700

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4701
static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4702
			     struct prefix_info *pinfo, u32 portid, u32 seq,
4703
			     int event, unsigned int flags)
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4704
{
4705 4706
	struct prefixmsg *pmsg;
	struct nlmsghdr *nlh;
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	struct prefix_cacheinfo	ci;

4709
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4710
	if (nlh == NULL)
4711
		return -EMSGSIZE;
4712 4713

	pmsg = nlmsg_data(nlh);
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4714
	pmsg->prefix_family = AF_INET6;
4715 4716
	pmsg->prefix_pad1 = 0;
	pmsg->prefix_pad2 = 0;
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	pmsg->prefix_ifindex = idev->dev->ifindex;
	pmsg->prefix_len = pinfo->prefix_len;
	pmsg->prefix_type = pinfo->type;
4720
	pmsg->prefix_pad3 = 0;
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	pmsg->prefix_flags = 0;
	if (pinfo->onlink)
		pmsg->prefix_flags |= IF_PREFIX_ONLINK;
	if (pinfo->autoconf)
		pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;

4727 4728
	if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
		goto nla_put_failure;
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4729 4730
	ci.preferred_time = ntohl(pinfo->prefered);
	ci.valid_time = ntohl(pinfo->valid);
4731 4732
	if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
		goto nla_put_failure;
4733
	return nlmsg_end(skb, nlh);
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4734

4735
nla_put_failure:
4736 4737
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
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4738 4739
}

4740
static void inet6_prefix_notify(int event, struct inet6_dev *idev,
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4741 4742 4743
			 struct prefix_info *pinfo)
{
	struct sk_buff *skb;
4744
	struct net *net = dev_net(idev->dev);
4745
	int err = -ENOBUFS;
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4746

4747
	skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4748 4749 4750 4751
	if (skb == NULL)
		goto errout;

	err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4752 4753 4754 4755 4756 4757
	if (err < 0) {
		/* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
4758 4759
	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
	return;
4760 4761
errout:
	if (err < 0)
4762
		rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
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4763 4764 4765 4766
}

static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
{
4767 4768
	struct net *net = dev_net(ifp->idev->dev);

4769 4770 4771
	if (event)
		ASSERT_RTNL();

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4772 4773 4774 4775
	inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);

	switch (event) {
	case RTM_NEWADDR:
4776 4777 4778 4779 4780 4781 4782 4783
		/*
		 * If the address was optimistic
		 * we inserted the route at the start of
		 * our DAD process, so we don't need
		 * to do it again
		 */
		if (!(ifp->rt->rt6i_node))
			ip6_ins_rt(ifp->rt);
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4784 4785
		if (ifp->idev->cnf.forwarding)
			addrconf_join_anycast(ifp);
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Cong Wang committed
4786
		if (!ipv6_addr_any(&ifp->peer_addr))
4787 4788
			addrconf_prefix_route(&ifp->peer_addr, 128,
					      ifp->idev->dev, 0, 0);
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4789 4790 4791 4792 4793
		break;
	case RTM_DELADDR:
		if (ifp->idev->cnf.forwarding)
			addrconf_leave_anycast(ifp);
		addrconf_leave_solict(ifp->idev, &ifp->addr);
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4794
		if (!ipv6_addr_any(&ifp->peer_addr)) {
4795 4796
			struct rt6_info *rt;

4797 4798
			rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
						       ifp->idev->dev, 0, 0);
4799 4800
			if (rt && ip6_del_rt(rt))
				dst_free(&rt->dst);
4801
		}
4802
		dst_hold(&ifp->rt->dst);
4803

4804
		if (ip6_del_rt(ifp->rt))
4805
			dst_free(&ifp->rt->dst);
4806 4807

		rt_genid_bump_ipv6(net);
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4808 4809
		break;
	}
4810
	atomic_inc(&net->ipv6.dev_addr_genid);
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4811 4812 4813 4814
}

static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
{
4815
	rcu_read_lock_bh();
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4816 4817
	if (likely(ifp->idev->dead == 0))
		__ipv6_ifa_notify(event, ifp);
4818
	rcu_read_unlock_bh();
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}

#ifdef CONFIG_SYSCTL

static
4824
int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
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			   void __user *buffer, size_t *lenp, loff_t *ppos)
{
	int *valp = ctl->data;
	int val = *valp;
4829
	loff_t pos = *ppos;
4830
	struct ctl_table lctl;
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4831 4832
	int ret;

4833 4834 4835 4836 4837 4838 4839 4840
	/*
	 * ctl->data points to idev->cnf.forwarding, we should
	 * not modify it until we get the rtnl lock.
	 */
	lctl = *ctl;
	lctl.data = &val;

	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
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4841

4842
	if (write)
4843
		ret = addrconf_fixup_forwarding(ctl, valp, val);
4844 4845
	if (ret)
		*ppos = pos;
4846
	return ret;
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4847 4848
}

4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863
static
int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
			void __user *buffer, size_t *lenp, loff_t *ppos)
{
	struct inet6_dev *idev = ctl->extra1;
	int min_mtu = IPV6_MIN_MTU;
	struct ctl_table lctl;

	lctl = *ctl;
	lctl.extra1 = &min_mtu;
	lctl.extra2 = idev ? &idev->dev->mtu : NULL;

	return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
}

4864 4865
static void dev_disable_change(struct inet6_dev *idev)
{
4866 4867
	struct netdev_notifier_info info;

4868 4869 4870
	if (!idev || !idev->dev)
		return;

4871
	netdev_notifier_info_init(&info, idev->dev);
4872
	if (idev->cnf.disable_ipv6)
4873
		addrconf_notify(NULL, NETDEV_DOWN, &info);
4874
	else
4875
		addrconf_notify(NULL, NETDEV_UP, &info);
4876 4877 4878 4879 4880 4881 4882
}

static void addrconf_disable_change(struct net *net, __s32 newf)
{
	struct net_device *dev;
	struct inet6_dev *idev;

4883 4884
	rcu_read_lock();
	for_each_netdev_rcu(net, dev) {
4885 4886 4887 4888 4889 4890 4891 4892
		idev = __in6_dev_get(dev);
		if (idev) {
			int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
			idev->cnf.disable_ipv6 = newf;
			if (changed)
				dev_disable_change(idev);
		}
	}
4893
	rcu_read_unlock();
4894 4895
}

4896
static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4897 4898
{
	struct net *net;
4899 4900 4901 4902
	int old;

	if (!rtnl_trylock())
		return restart_syscall();
4903 4904

	net = (struct net *)table->extra2;
4905 4906
	old = *p;
	*p = newf;
4907

4908 4909
	if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
		rtnl_unlock();
4910
		return 0;
4911
	}
4912 4913 4914 4915

	if (p == &net->ipv6.devconf_all->disable_ipv6) {
		net->ipv6.devconf_dflt->disable_ipv6 = newf;
		addrconf_disable_change(net, newf);
4916
	} else if ((!newf) ^ (!old))
4917 4918 4919 4920 4921 4922 4923
		dev_disable_change((struct inet6_dev *)table->extra1);

	rtnl_unlock();
	return 0;
}

static
4924
int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4925 4926 4927 4928
			    void __user *buffer, size_t *lenp, loff_t *ppos)
{
	int *valp = ctl->data;
	int val = *valp;
4929
	loff_t pos = *ppos;
4930
	struct ctl_table lctl;
4931 4932
	int ret;

4933 4934 4935 4936 4937 4938 4939 4940
	/*
	 * ctl->data points to idev->cnf.disable_ipv6, we should
	 * not modify it until we get the rtnl lock.
	 */
	lctl = *ctl;
	lctl.data = &val;

	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4941 4942 4943

	if (write)
		ret = addrconf_disable_ipv6(ctl, valp, val);
4944 4945
	if (ret)
		*ppos = pos;
4946 4947 4948
	return ret;
}

4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988
static
int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
			      void __user *buffer, size_t *lenp, loff_t *ppos)
{
	int *valp = ctl->data;
	int ret;
	int old, new;

	old = *valp;
	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
	new = *valp;

	if (write && old != new) {
		struct net *net = ctl->extra2;

		if (!rtnl_trylock())
			return restart_syscall();

		if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
						     NETCONFA_IFINDEX_DEFAULT,
						     net->ipv6.devconf_dflt);
		else if (valp == &net->ipv6.devconf_all->proxy_ndp)
			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
						     NETCONFA_IFINDEX_ALL,
						     net->ipv6.devconf_all);
		else {
			struct inet6_dev *idev = ctl->extra1;

			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
						     idev->dev->ifindex,
						     &idev->cnf);
		}
		rtnl_unlock();
	}

	return ret;
}


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4989 4990 4991
static struct addrconf_sysctl_table
{
	struct ctl_table_header *sysctl_header;
4992
	struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4993
} addrconf_sysctl __read_mostly = {
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4994 4995
	.sysctl_header = NULL,
	.addrconf_vars = {
4996
		{
4997 4998 4999 5000 5001
			.procname	= "forwarding",
			.data		= &ipv6_devconf.forwarding,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= addrconf_sysctl_forward,
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5002 5003
		},
		{
5004 5005 5006 5007 5008
			.procname	= "hop_limit",
			.data		= &ipv6_devconf.hop_limit,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5009 5010
		},
		{
5011 5012 5013 5014
			.procname	= "mtu",
			.data		= &ipv6_devconf.mtu6,
			.maxlen		= sizeof(int),
			.mode		= 0644,
5015
			.proc_handler	= addrconf_sysctl_mtu,
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		},
		{
5018 5019 5020 5021 5022
			.procname	= "accept_ra",
			.data		= &ipv6_devconf.accept_ra,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5023 5024
		},
		{
5025 5026 5027 5028 5029
			.procname	= "accept_redirects",
			.data		= &ipv6_devconf.accept_redirects,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5030 5031
		},
		{
5032 5033 5034 5035 5036
			.procname	= "autoconf",
			.data		= &ipv6_devconf.autoconf,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5037 5038
		},
		{
5039 5040 5041 5042 5043
			.procname	= "dad_transmits",
			.data		= &ipv6_devconf.dad_transmits,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5044 5045
		},
		{
5046 5047 5048 5049 5050
			.procname	= "router_solicitations",
			.data		= &ipv6_devconf.rtr_solicits,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5051 5052
		},
		{
5053 5054 5055 5056 5057
			.procname	= "router_solicitation_interval",
			.data		= &ipv6_devconf.rtr_solicit_interval,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec_jiffies,
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5058 5059
		},
		{
5060 5061 5062 5063 5064
			.procname	= "router_solicitation_delay",
			.data		= &ipv6_devconf.rtr_solicit_delay,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec_jiffies,
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		},
		{
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			.procname	= "force_mld_version",
			.data		= &ipv6_devconf.force_mld_version,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5072
		},
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		{
			.procname	= "mldv1_unsolicited_report_interval",
			.data		=
				&ipv6_devconf.mldv1_unsolicited_report_interval,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec_ms_jiffies,
		},
		{
			.procname	= "mldv2_unsolicited_report_interval",
			.data		=
				&ipv6_devconf.mldv2_unsolicited_report_interval,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec_ms_jiffies,
		},
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5089
		{
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			.procname	= "use_tempaddr",
			.data		= &ipv6_devconf.use_tempaddr,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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		},
		{
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			.procname	= "temp_valid_lft",
			.data		= &ipv6_devconf.temp_valid_lft,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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		},
		{
5104 5105 5106 5107 5108
			.procname	= "temp_prefered_lft",
			.data		= &ipv6_devconf.temp_prefered_lft,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5109 5110
		},
		{
5111 5112 5113 5114 5115
			.procname	= "regen_max_retry",
			.data		= &ipv6_devconf.regen_max_retry,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5116 5117
		},
		{
5118 5119 5120 5121 5122
			.procname	= "max_desync_factor",
			.data		= &ipv6_devconf.max_desync_factor,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5123 5124
		},
		{
5125 5126 5127 5128 5129
			.procname	= "max_addresses",
			.data		= &ipv6_devconf.max_addresses,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
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5130
		},
5131
		{
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			.procname	= "accept_ra_defrtr",
			.data		= &ipv6_devconf.accept_ra_defrtr,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
5137
		},
5138
		{
5139 5140 5141 5142 5143
			.procname	= "accept_ra_pinfo",
			.data		= &ipv6_devconf.accept_ra_pinfo,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
5144
		},
5145 5146
#ifdef CONFIG_IPV6_ROUTER_PREF
		{
5147 5148 5149 5150 5151
			.procname	= "accept_ra_rtr_pref",
			.data		= &ipv6_devconf.accept_ra_rtr_pref,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
5152
		},
5153
		{
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			.procname	= "router_probe_interval",
			.data		= &ipv6_devconf.rtr_probe_interval,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec_jiffies,
5159
		},
5160
#ifdef CONFIG_IPV6_ROUTE_INFO
5161
		{
5162 5163 5164 5165 5166
			.procname	= "accept_ra_rt_info_max_plen",
			.data		= &ipv6_devconf.accept_ra_rt_info_max_plen,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
5167 5168
		},
#endif
5169
#endif
5170
		{
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			.procname	= "proxy_ndp",
			.data		= &ipv6_devconf.proxy_ndp,
			.maxlen		= sizeof(int),
			.mode		= 0644,
5175
			.proc_handler	= addrconf_sysctl_proxy_ndp,
5176
		},
5177
		{
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			.procname	= "accept_source_route",
			.data		= &ipv6_devconf.accept_source_route,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
5183
		},
5184 5185
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
		{
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			.procname       = "optimistic_dad",
			.data           = &ipv6_devconf.optimistic_dad,
			.maxlen         = sizeof(int),
			.mode           = 0644,
			.proc_handler   = proc_dointvec,
5191 5192

		},
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#endif
#ifdef CONFIG_IPV6_MROUTE
		{
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			.procname	= "mc_forwarding",
			.data		= &ipv6_devconf.mc_forwarding,
			.maxlen		= sizeof(int),
			.mode		= 0444,
			.proc_handler	= proc_dointvec,
5201
		},
5202
#endif
5203
		{
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			.procname	= "disable_ipv6",
			.data		= &ipv6_devconf.disable_ipv6,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= addrconf_sysctl_disable,
5209
		},
5210
		{
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			.procname	= "accept_dad",
			.data		= &ipv6_devconf.accept_dad,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
5216
		},
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		{
			.procname       = "force_tllao",
			.data           = &ipv6_devconf.force_tllao,
			.maxlen         = sizeof(int),
			.mode           = 0644,
			.proc_handler   = proc_dointvec
		},
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		{
			.procname       = "ndisc_notify",
			.data           = &ipv6_devconf.ndisc_notify,
			.maxlen         = sizeof(int),
			.mode           = 0644,
			.proc_handler   = proc_dointvec
		},
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		{
			.procname	= "suppress_frag_ndisc",
			.data		= &ipv6_devconf.suppress_frag_ndisc,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec
		},
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		{
			.procname	= "accept_ra_from_local",
			.data		= &ipv6_devconf.accept_ra_from_local,
			.maxlen		= sizeof(int),
			.mode		= 0644,
			.proc_handler	= proc_dointvec,
		},
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5245
		{
5246
			/* sentinel */
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		}
	},
};

5251
static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5252
		struct inet6_dev *idev, struct ipv6_devconf *p)
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5253 5254 5255
{
	int i;
	struct addrconf_sysctl_table *t;
5256
	char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5257

5258
	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
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5259
	if (t == NULL)
5260 5261
		goto out;

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5262
	for (i = 0; t->addrconf_vars[i].data; i++) {
5263
		t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
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5264
		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5265
		t->addrconf_vars[i].extra2 = net;
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5266 5267
	}

5268
	snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
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5269

5270
	t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
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5271
	if (t->sysctl_header == NULL)
5272
		goto free;
5273 5274

	p->sysctl = t;
5275
	return 0;
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5276

5277
free:
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5278
	kfree(t);
5279
out:
5280
	return -ENOBUFS;
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5281 5282
}

5283 5284 5285 5286 5287 5288 5289 5290 5291
static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
{
	struct addrconf_sysctl_table *t;

	if (p->sysctl == NULL)
		return;

	t = p->sysctl;
	p->sysctl = NULL;
5292
	unregister_net_sysctl_table(t->sysctl_header);
5293 5294 5295
	kfree(t);
}

5296
static int addrconf_sysctl_register(struct inet6_dev *idev)
5297
{
5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312
	int err;

	if (!sysctl_dev_name_is_allowed(idev->dev->name))
		return -EINVAL;

	err = neigh_sysctl_register(idev->dev, idev->nd_parms,
				    &ndisc_ifinfo_sysctl_change);
	if (err)
		return err;
	err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
					 idev, &idev->cnf);
	if (err)
		neigh_sysctl_unregister(idev->nd_parms);

	return err;
5313 5314
}

5315
static void addrconf_sysctl_unregister(struct inet6_dev *idev)
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5316
{
5317 5318
	__addrconf_sysctl_unregister(&idev->cnf);
	neigh_sysctl_unregister(idev->nd_parms);
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5319 5320 5321 5322 5323
}


#endif

5324
static int __net_init addrconf_init_net(struct net *net)
5325
{
5326
	int err = -ENOMEM;
5327 5328
	struct ipv6_devconf *all, *dflt;

5329 5330 5331
	all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
	if (all == NULL)
		goto err_alloc_all;
5332

5333 5334 5335
	dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
	if (dflt == NULL)
		goto err_alloc_dflt;
5336

5337 5338 5339
	/* these will be inherited by all namespaces */
	dflt->autoconf = ipv6_defaults.autoconf;
	dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5340 5341 5342 5343 5344

	net->ipv6.devconf_all = all;
	net->ipv6.devconf_dflt = dflt;

#ifdef CONFIG_SYSCTL
5345
	err = __addrconf_sysctl_register(net, "all", NULL, all);
5346 5347 5348
	if (err < 0)
		goto err_reg_all;

5349
	err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366
	if (err < 0)
		goto err_reg_dflt;
#endif
	return 0;

#ifdef CONFIG_SYSCTL
err_reg_dflt:
	__addrconf_sysctl_unregister(all);
err_reg_all:
	kfree(dflt);
#endif
err_alloc_dflt:
	kfree(all);
err_alloc_all:
	return err;
}

5367
static void __net_exit addrconf_exit_net(struct net *net)
5368 5369 5370 5371 5372
{
#ifdef CONFIG_SYSCTL
	__addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
	__addrconf_sysctl_unregister(net->ipv6.devconf_all);
#endif
5373
	if (!net_eq(net, &init_net)) {
5374 5375 5376 5377 5378 5379 5380 5381 5382 5383
		kfree(net->ipv6.devconf_dflt);
		kfree(net->ipv6.devconf_all);
	}
}

static struct pernet_operations addrconf_ops = {
	.init = addrconf_init_net,
	.exit = addrconf_exit_net,
};

5384 5385 5386 5387
static struct rtnl_af_ops inet6_ops = {
	.family		  = AF_INET6,
	.fill_link_af	  = inet6_fill_link_af,
	.get_link_af_size = inet6_get_link_af_size,
5388
	.validate_link_af = inet6_validate_link_af,
5389
	.set_link_af	  = inet6_set_link_af,
5390 5391
};

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5392 5393 5394 5395 5396 5397
/*
 *	Init / cleanup code
 */

int __init addrconf_init(void)
{
5398
	struct inet6_dev *idev;
5399
	int i, err;
5400

5401 5402
	err = ipv6_addr_label_init();
	if (err < 0) {
5403 5404
		pr_crit("%s: cannot initialize default policy table: %d\n",
			__func__, err);
5405
		goto out;
5406
	}
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5407

5408 5409 5410
	err = register_pernet_subsys(&addrconf_ops);
	if (err < 0)
		goto out_addrlabel;
5411

5412 5413 5414 5415 5416 5417
	addrconf_wq = create_workqueue("ipv6_addrconf");
	if (!addrconf_wq) {
		err = -ENOMEM;
		goto out_nowq;
	}

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5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436
	/* The addrconf netdev notifier requires that loopback_dev
	 * has it's ipv6 private information allocated and setup
	 * before it can bring up and give link-local addresses
	 * to other devices which are up.
	 *
	 * Unfortunately, loopback_dev is not necessarily the first
	 * entry in the global dev_base list of net devices.  In fact,
	 * it is likely to be the very last entry on that list.
	 * So this causes the notifier registry below to try and
	 * give link-local addresses to all devices besides loopback_dev
	 * first, then loopback_dev, which cases all the non-loopback_dev
	 * devices to fail to get a link-local address.
	 *
	 * So, as a temporary fix, allocate the ipv6 structure for
	 * loopback_dev first by hand.
	 * Longer term, all of the dependencies ipv6 has upon the loopback
	 * device and it being up should be removed.
	 */
	rtnl_lock();
5437
	idev = ipv6_add_dev(init_net.loopback_dev);
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5438
	rtnl_unlock();
5439 5440
	if (IS_ERR(idev)) {
		err = PTR_ERR(idev);
5441
		goto errlo;
5442
	}
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5443

5444 5445 5446
	for (i = 0; i < IN6_ADDR_HSIZE; i++)
		INIT_HLIST_HEAD(&inet6_addr_lst[i]);

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5447 5448
	register_netdevice_notifier(&ipv6_dev_notf);

5449
	addrconf_verify();
5450

5451
	rtnl_af_register(&inet6_ops);
5452

5453 5454
	err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
			      NULL);
5455 5456 5457 5458
	if (err < 0)
		goto errout;

	/* Only the first call to __rtnl_register can fail */
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	__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
	__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
	__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
			inet6_dump_ifaddr, NULL);
	__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
			inet6_dump_ifmcaddr, NULL);
	__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
			inet6_dump_ifacaddr, NULL);
5467
	__rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5468
			inet6_netconf_dump_devconf, NULL);
5469

5470 5471
	ipv6_addr_label_rtnl_register();

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5472
	return 0;
5473
errout:
5474
	rtnl_af_unregister(&inet6_ops);
5475
	unregister_netdevice_notifier(&ipv6_dev_notf);
5476
errlo:
5477 5478
	destroy_workqueue(addrconf_wq);
out_nowq:
5479
	unregister_pernet_subsys(&addrconf_ops);
5480 5481 5482
out_addrlabel:
	ipv6_addr_label_cleanup();
out:
5483
	return err;
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5484 5485
}

5486
void addrconf_cleanup(void)
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5487
{
5488
	struct net_device *dev;
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5489 5490 5491
	int i;

	unregister_netdevice_notifier(&ipv6_dev_notf);
5492
	unregister_pernet_subsys(&addrconf_ops);
5493
	ipv6_addr_label_cleanup();
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5494 5495 5496

	rtnl_lock();

5497 5498
	__rtnl_af_unregister(&inet6_ops);

5499 5500 5501 5502 5503 5504 5505 5506
	/* clean dev list */
	for_each_netdev(&init_net, dev) {
		if (__in6_dev_get(dev) == NULL)
			continue;
		addrconf_ifdown(dev, 1);
	}
	addrconf_ifdown(init_net.loopback_dev, 2);

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5507 5508 5509
	/*
	 *	Check hash table.
	 */
5510
	spin_lock_bh(&addrconf_hash_lock);
5511 5512
	for (i = 0; i < IN6_ADDR_HSIZE; i++)
		WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5513
	spin_unlock_bh(&addrconf_hash_lock);
5514
	cancel_delayed_work(&addr_chk_work);
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5515
	rtnl_unlock();
5516 5517

	destroy_workqueue(addrconf_wq);
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5518
}