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| author | Eric Dumazet <edumazet@google.com> | 2016-07-08 05:18:24 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-07-09 18:12:25 -0400 |
| commit | fa17806cde76fb1087532f07e72aa757a30e0500 (patch) | |
| tree | 89493cdb11e72b554373adfa2de627407ef908e1 /net/ipv4/devinet.c | |
| parent | db9a1ba55a94b87d1ccbcdb74a35307f7a40aa9b (diff) | |
| download | linux-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.c | 12 |
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(); } } |