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net: ipv6: Add support for RTM_DELNETCONF

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Send RTM_DELNETCONF notifications when a device is deleted. The message only
needs the device index, so modify inet6_netconf_fill_devconf to skip devconf
references if it is NULL.

Allows a userspace cache to remove entries as devices are deleted.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2017-03-28 14:28:05 -07:00 committed by David S. Miller
parent 85b3daada4
commit 2345217026
1 changed files with 15 additions and 5 deletions
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20
net/ipv6/addrconf.c
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@ -549,6 +549,9 @@ static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
goto nla_put_failure;
if (!devconf)
goto out;
if ((all || type == NETCONFA_FORWARDING) &&
nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
goto nla_put_failure;
@ -567,6 +570,7 @@ static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
devconf->ignore_routes_with_linkdown) < 0)
goto nla_put_failure;
out:
nlmsg_end(skb, nlh);
return 0;
@ -6368,7 +6372,8 @@ out:
return -ENOBUFS;
}
static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
static void __addrconf_sysctl_unregister(struct net *net,
struct ipv6_devconf *p, int ifindex)
{
struct ctl_table *table;
@ -6379,6 +6384,8 @@ static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
unregister_net_sysctl_table(p->sysctl_header);
p->sysctl_header = NULL;
kfree(table);
inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
}
static int addrconf_sysctl_register(struct inet6_dev *idev)
@ -6402,7 +6409,8 @@ static int addrconf_sysctl_register(struct inet6_dev *idev)
static void addrconf_sysctl_unregister(struct inet6_dev *idev)
{
__addrconf_sysctl_unregister(&idev->cnf);
__addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
idev->dev->ifindex);
neigh_sysctl_unregister(idev->nd_parms);
}
@ -6445,7 +6453,7 @@ static int __net_init addrconf_init_net(struct net *net)
#ifdef CONFIG_SYSCTL
err_reg_dflt:
__addrconf_sysctl_unregister(all);
__addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
err_reg_all:
kfree(dflt);
#endif
@ -6458,8 +6466,10 @@ err_alloc_all:
static void __net_exit addrconf_exit_net(struct net *net)
{
#ifdef CONFIG_SYSCTL
__addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
__addrconf_sysctl_unregister(net->ipv6.devconf_all);
__addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
NETCONFA_IFINDEX_DEFAULT);
__addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
NETCONFA_IFINDEX_ALL);
#endif
kfree(net->ipv6.devconf_dflt);
kfree(net->ipv6.devconf_all);