Commit 71e27da9 authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

[IPV4]: Restore old behaviour of default config values 



Previously inet devices were only constructed when addresses are added
(or rarely in ipmr).  Therefore the default config values they get are
the ones at the time of these operations.

Now that we're creating inet devices earlier, this changes the
behaviour of default config values in an incompatible way (see bug
#8519).

This patch creates a compromise by setting the default values at the
same point as before but only for those that have not been explicitly
set by the user since the inet device's creation.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 31be3085

include/linux/inetdevice.h

+5 −1
Original line number Diff line number Diff line
@@ -59,6 +59,11 @@ static inline void ipv4_devconf_set(struct in_device *in_dev, int index, 
	in_dev->cnf.data[index] = val;

}



static inline void ipv4_devconf_setall(struct in_device *in_dev)

{

	bitmap_fill(in_dev->cnf.state, __NET_IPV4_CONF_MAX - 1);

}



#define IN_DEV_CONF_GET(in_dev, attr) \

	ipv4_devconf_get((in_dev), NET_IPV4_CONF_ ## attr)

#define IN_DEV_CONF_SET(in_dev, attr, val) \
@@ -125,7 +130,6 @@ extern struct net_device *ip_dev_find(__be32 addr); 
extern int		inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);

extern int		devinet_ioctl(unsigned int cmd, void __user *);

extern void		devinet_init(void);

extern struct in_device *inetdev_init(struct net_device *dev);

extern struct in_device	*inetdev_by_index(int);

extern __be32		inet_select_addr(const struct net_device *dev, __be32 dst, int scope);

extern __be32		inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope);

net/ipv4/devinet.c

+8 −11
Original line number Diff line number Diff line
@@ -147,7 +147,7 @@ void in_dev_finish_destroy(struct in_device *idev) 
	}

}



struct in_device *inetdev_init(struct net_device *dev)

static struct in_device *inetdev_init(struct net_device *dev)

{

	struct in_device *in_dev;
@@ -404,13 +404,11 @@ static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) 


	ASSERT_RTNL();



	if (!in_dev) {

		in_dev = inetdev_init(dev);

	if (!in_dev) {

		inet_free_ifa(ifa);

		return -ENOBUFS;

	}

	}

	ipv4_devconf_setall(in_dev);

	if (ifa->ifa_dev != in_dev) {

		BUG_TRAP(!ifa->ifa_dev);

		in_dev_hold(in_dev);
@@ -519,13 +517,12 @@ static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh) 
	}



	in_dev = __in_dev_get_rtnl(dev);

	if (in_dev == NULL) {

		in_dev = inetdev_init(dev);

	if (in_dev == NULL) {

		err = -ENOBUFS;

		goto errout;

	}

	}



	ipv4_devconf_setall(in_dev);



	ifa = inet_alloc_ifa();

	if (ifa == NULL) {

net/ipv4/ipmr.c

+11 −4
Original line number Diff line number Diff line
@@ -152,9 +152,11 @@ struct net_device *ipmr_new_tunnel(struct vifctl *v) 
			dev->flags |= IFF_MULTICAST;



			in_dev = __in_dev_get_rtnl(dev);

			if (in_dev == NULL && (in_dev = inetdev_init(dev)) == NULL)

			if (in_dev == NULL)

				goto failure;

			IN_DEV_CONF_SET(in_dev, RP_FILTER, 0);



			ipv4_devconf_setall(in_dev);

			IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;



			if (dev_open(dev))

				goto failure;
@@ -218,10 +220,15 @@ static struct net_device *ipmr_reg_vif(void) 
	}

	dev->iflink = 0;



	if ((in_dev = inetdev_init(dev)) == NULL)

	rcu_read_lock();

	if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {

		rcu_read_unlock();

		goto failure;

	}



	IN_DEV_CONF_SET(in_dev, RP_FILTER, 0);

	ipv4_devconf_setall(in_dev);

	IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;

	rcu_read_unlock();



	if (dev_open(dev))

		goto failure;

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