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Commit 6a923934 authored by David S. Miller's avatar David S. Miller
Browse files

Revert "ipv6: Revert optional address flusing on ifdown." 



This reverts commit 841645b5.

Ok, this puts the feature back.  I've decided to apply David A.'s
bug fix and run with that rather than make everyone wait another
whole release for this feature.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fc96256c

Documentation/networking/ip-sysctl.txt

+9 −0
Original line number Diff line number Diff line
@@ -1568,6 +1568,15 @@ temp_prefered_lft - INTEGER 
	Preferred lifetime (in seconds) for temporary addresses.

	Default: 86400 (1 day)



keep_addr_on_down - INTEGER

	Keep all IPv6 addresses on an interface down event. If set static

	global addresses with no expiration time are not flushed.

	  >0 : enabled

	   0 : system default

	  <0 : disabled



	Default: 0 (addresses are removed)



max_desync_factor - INTEGER

	Maximum value for DESYNC_FACTOR, which is a random value

	that ensures that clients don't synchronize with each

include/linux/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ struct ipv6_devconf { 
		struct in6_addr secret;

	} stable_secret;

	__s32		use_oif_addrs_only;

	__s32		keep_addr_on_down;

	void		*sysctl;

};

include/uapi/linux/ipv6.h

+1 −0
Original line number Diff line number Diff line
@@ -176,6 +176,7 @@ enum { 
	DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,

	DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,

	DEVCONF_DROP_UNSOLICITED_NA,

	DEVCONF_KEEP_ADDR_ON_DOWN,

	DEVCONF_MAX

};

net/ipv6/addrconf.c

+150 −12
Original line number Diff line number Diff line
@@ -216,6 +216,7 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = { 
	},

	.use_oif_addrs_only	= 0,

	.ignore_routes_with_linkdown = 0,

	.keep_addr_on_down	= 0,

};



static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
@@ -260,6 +261,7 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 
	},

	.use_oif_addrs_only	= 0,

	.ignore_routes_with_linkdown = 0,

	.keep_addr_on_down	= 0,

};



/* Check if a valid qdisc is available */
@@ -3174,6 +3176,81 @@ static void addrconf_gre_config(struct net_device *dev) 
}

#endif



#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)

/* If the host route is cached on the addr struct make sure it is associated

 * with the proper table. e.g., enslavement can change and if so the cached

 * host route needs to move to the new table.

 */

static void l3mdev_check_host_rt(struct inet6_dev *idev,

				  struct inet6_ifaddr *ifp)

{

	if (ifp->rt) {

		u32 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;



		if (tb_id != ifp->rt->rt6i_table->tb6_id) {

			ip6_del_rt(ifp->rt);

			ifp->rt = NULL;

		}

	}

}

#else

static void l3mdev_check_host_rt(struct inet6_dev *idev,

				  struct inet6_ifaddr *ifp)

{

}

#endif



static int fixup_permanent_addr(struct inet6_dev *idev,

				struct inet6_ifaddr *ifp)

{

	l3mdev_check_host_rt(idev, ifp);



	if (!ifp->rt) {

		struct rt6_info *rt;



		rt = addrconf_dst_alloc(idev, &ifp->addr, false);

		if (unlikely(IS_ERR(rt)))

			return PTR_ERR(rt);



		ifp->rt = rt;

	}



	if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {

		addrconf_prefix_route(&ifp->addr, ifp->prefix_len,

				      idev->dev, 0, 0);

	}



	addrconf_dad_start(ifp);



	return 0;

}



static void addrconf_permanent_addr(struct net_device *dev)

{

	struct inet6_ifaddr *ifp, *tmp;

	struct inet6_dev *idev;



	idev = __in6_dev_get(dev);

	if (!idev)

		return;



	write_lock_bh(&idev->lock);



	list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {

		if ((ifp->flags & IFA_F_PERMANENT) &&

		    fixup_permanent_addr(idev, ifp) < 0) {

			write_unlock_bh(&idev->lock);

			ipv6_del_addr(ifp);

			write_lock_bh(&idev->lock);



			net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",

					     idev->dev->name, &ifp->addr);

		}

	}



	write_unlock_bh(&idev->lock);

}



static int addrconf_notify(struct notifier_block *this, unsigned long event,

			   void *ptr)

{
@@ -3260,6 +3337,9 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, 
			run_pending = 1;

		}



		/* restore routes for permanent addresses */

		addrconf_permanent_addr(dev);



		switch (dev->type) {

#if IS_ENABLED(CONFIG_IPV6_SIT)

		case ARPHRD_SIT:
@@ -3368,11 +3448,20 @@ static void addrconf_type_change(struct net_device *dev, unsigned long event) 
		ipv6_mc_unmap(idev);

}



static bool addr_is_local(const struct in6_addr *addr)

{

	return ipv6_addr_type(addr) &

		(IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);

}



static int addrconf_ifdown(struct net_device *dev, int how)

{

	struct net *net = dev_net(dev);

	struct inet6_dev *idev;

	struct inet6_ifaddr *ifa;

	struct inet6_ifaddr *ifa, *tmp;

	struct list_head del_list;

	int _keep_addr;

	bool keep_addr;

	int state, i;



	ASSERT_RTNL();
@@ -3399,6 +3488,16 @@ static int addrconf_ifdown(struct net_device *dev, int how) 


	}



	/* aggregate the system setting and interface setting */

	_keep_addr = net->ipv6.devconf_all->keep_addr_on_down;

	if (!_keep_addr)

		_keep_addr = idev->cnf.keep_addr_on_down;



	/* combine the user config with event to determine if permanent

	 * addresses are to be removed from address hash table

	 */

	keep_addr = !(how || _keep_addr <= 0);



	/* Step 2: clear hash table */

	for (i = 0; i < IN6_ADDR_HSIZE; i++) {

		struct hlist_head *h = &inet6_addr_lst[i];
@@ -3407,11 +3506,18 @@ static int addrconf_ifdown(struct net_device *dev, int how) 
restart:

		hlist_for_each_entry_rcu(ifa, h, addr_lst) {

			if (ifa->idev == idev) {

				hlist_del_init_rcu(&ifa->addr_lst);

				addrconf_del_dad_work(ifa);

				/* combined flag + permanent flag decide if

				 * address is retained on a down event

				 */

				if (!keep_addr ||

				    !(ifa->flags & IFA_F_PERMANENT) ||

				    addr_is_local(&ifa->addr)) {

					hlist_del_init_rcu(&ifa->addr_lst);

					goto restart;

				}

			}

		}

		spin_unlock_bh(&addrconf_hash_lock);

	}
@@ -3443,31 +3549,54 @@ static int addrconf_ifdown(struct net_device *dev, int how) 
		write_lock_bh(&idev->lock);

	}



	while (!list_empty(&idev->addr_list)) {

		ifa = list_first_entry(&idev->addr_list,

				       struct inet6_ifaddr, if_list);

		addrconf_del_dad_work(ifa);

	/* re-combine the user config with event to determine if permanent

	 * addresses are to be removed from the interface list

	 */

	keep_addr = (!how && _keep_addr > 0);



		list_del(&ifa->if_list);

	INIT_LIST_HEAD(&del_list);

	list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {

		addrconf_del_dad_work(ifa);



		write_unlock_bh(&idev->lock);



		spin_lock_bh(&ifa->lock);



		if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&

		    !addr_is_local(&ifa->addr)) {

			/* set state to skip the notifier below */

			state = INET6_IFADDR_STATE_DEAD;

			ifa->state = 0;

			if (!(ifa->flags & IFA_F_NODAD))

				ifa->flags |= IFA_F_TENTATIVE;

		} else {

			state = ifa->state;

			ifa->state = INET6_IFADDR_STATE_DEAD;



			list_del(&ifa->if_list);

			list_add(&ifa->if_list, &del_list);

		}



		spin_unlock_bh(&ifa->lock);



		if (state != INET6_IFADDR_STATE_DEAD) {

			__ipv6_ifa_notify(RTM_DELADDR, ifa);

			inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);

		}

		in6_ifa_put(ifa);



		write_lock_bh(&idev->lock);

	}



	write_unlock_bh(&idev->lock);



	/* now clean up addresses to be removed */

	while (!list_empty(&del_list)) {

		ifa = list_first_entry(&del_list,

				       struct inet6_ifaddr, if_list);

		list_del(&ifa->if_list);



		in6_ifa_put(ifa);

	}



	/* Step 5: Discard anycast and multicast list */

	if (how) {

		ipv6_ac_destroy_dev(idev);
@@ -4732,6 +4861,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 
	array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;

	array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;

	array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;

	array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;

}



static inline size_t inet6_ifla6_size(void)
@@ -5819,6 +5949,14 @@ static struct addrconf_sysctl_table 
			.mode		= 0644,

			.proc_handler	= proc_dointvec,

		},

		{

			.procname       = "keep_addr_on_down",

			.data           = &ipv6_devconf.keep_addr_on_down,

			.maxlen         = sizeof(int),

			.mode           = 0644,

			.proc_handler   = proc_dointvec,



		},

		{

			/* sentinel */

		}