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ipv6: addrconf: don't use rtnl mutex in RTM_GETNETCONF 

Instead of relying on rtnl mutex bump device reference count.
After this change, values reported can change in parallel, but thats not
much different from current state, as anyone can change the settings
right after rtnl_unlock (and before userspace processed reply).

While at it, switch to GFP_KERNEL allocation.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2017-10-11 10:28:00 +02:00 committed by David S. Miller
parent b274f6db14
commit 4ea2607f78
1 changed files with 15 additions and 11 deletions
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26
net/ipv6/addrconf.c
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@ -616,23 +616,23 @@ static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[NETCONFA_MAX+1];
struct inet6_dev *in6_dev = NULL;
struct net_device *dev = NULL;
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, extack);
if (err < 0)
goto errout;
return err;
if (!tb[NETCONFA_IFINDEX])
return -EINVAL;
err = -EINVAL;
if (!tb[NETCONFA_IFINDEX])
goto errout;
ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
switch (ifindex) {
case NETCONFA_IFINDEX_ALL:
@ -642,10 +642,10 @@ static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
devconf = net->ipv6.devconf_dflt;
break;
default:
dev = __dev_get_by_index(net, ifindex);
dev = dev_get_by_index(net, ifindex);
if (!dev)
goto errout;
in6_dev = __in6_dev_get(dev);
return -EINVAL;
in6_dev = in6_dev_get(dev);
if (!in6_dev)
goto errout;
devconf = &in6_dev->cnf;
@ -653,7 +653,7 @@ static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
}
err = -ENOBUFS;
skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
if (!skb)
goto errout;
@ -669,6 +669,10 @@ static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
}
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
errout:
if (in6_dev)
in6_dev_put(in6_dev);
if (dev)
dev_put(dev);
return err;
}
@ -6570,7 +6574,7 @@ int __init addrconf_init(void)
__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
inet6_dump_ifacaddr, 0);
__rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
inet6_netconf_dump_devconf, 0);
inet6_netconf_dump_devconf, RTNL_FLAG_DOIT_UNLOCKED);
ipv6_addr_label_rtnl_register();