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authorEric Dumazet <edumazet@google.com>2016-07-08 05:18:24 +0200
committerDavid S. Miller <davem@davemloft.net>2016-07-09 18:12:25 -0400
commitfa17806cde76fb1087532f07e72aa757a30e0500 (patch)
tree89493cdb11e72b554373adfa2de627407ef908e1 /net/ipv4/devinet.c
parentdb9a1ba55a94b87d1ccbcdb74a35307f7a40aa9b (diff)
downloadlinux-fa17806cde76fb1087532f07e72aa757a30e0500.tar.bz2
ipv4: do not abuse GFP_ATOMIC in inet_netconf_notify_devconf()
inet_forward_change() runs with RTNL held. We are allowed to sleep if required. If we use __in_dev_get_rtnl() instead of __in_dev_get_rcu(), we no longer have to use GFP_ATOMIC allocations in inet_netconf_notify_devconf(), meaning we are less likely to miss notifications under memory pressure, and wont touch precious memory reserves either and risk dropping incoming packets. inet_netconf_get_devconf() can also use GFP_KERNEL allocation. Fixes: edc9e748934c ("rtnl/ipv4: use netconf msg to advertise forwarding status") Fixes: 9e5511106f99 ("rtnl/ipv4: add support of RTM_GETNETCONF") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com> Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/devinet.c')
-rw-r--r--net/ipv4/devinet.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index e333bc86bd39..415e117967c7 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1834,7 +1834,7 @@ void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
struct sk_buff *skb;
int err = -ENOBUFS;
- skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
+ skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
if (!skb)
goto errout;
@@ -1846,7 +1846,7 @@ void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
kfree_skb(skb);
goto errout;
}
- rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
return;
errout:
if (err < 0)
@@ -1903,7 +1903,7 @@ static int inet_netconf_get_devconf(struct sk_buff *in_skb,
}
err = -ENOBUFS;
- skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
+ skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
if (!skb)
goto errout;
@@ -2027,16 +2027,16 @@ static void inet_forward_change(struct net *net)
for_each_netdev(net, dev) {
struct in_device *in_dev;
+
if (on)
dev_disable_lro(dev);
- rcu_read_lock();
- in_dev = __in_dev_get_rcu(dev);
+
+ in_dev = __in_dev_get_rtnl(dev);
if (in_dev) {
IN_DEV_CONF_SET(in_dev, FORWARDING, on);
inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
dev->ifindex, &in_dev->cnf);
}
- rcu_read_unlock();
}
}