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authorNicolas Dichtel <nicolas.dichtel@6wind.com>2015-05-07 11:02:50 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-09 22:15:31 -0400
commit3138dbf881274cb20d9aa1b307861f689e820fbe (patch)
tree01cfdb1aff0ae9f7ff28b26f27df59cece6bceb1 /net/core/net_namespace.c
parent7a0877d4b438886b72be61632eaa774d13262f70 (diff)
netns: notify new nsid outside __peernet2id()
There is no functional change with this patch. It will ease the refactoring of the locking system that protects nsids and the support of the netlink socket option NETLINK_LISTEN_ALL_NSID. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/net_namespace.c')
-rw-r--r--net/core/net_namespace.c41
1 files changed, 27 insertions, 14 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 9c806ac569f9..ee864241f8d6 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -147,10 +147,9 @@ static void ops_free_list(const struct pernet_operations *ops,
}
}
-static void rtnl_net_notifyid(struct net *net, int cmd, int id);
static int alloc_netid(struct net *net, struct net *peer, int reqid)
{
- int min = 0, max = 0, id;
+ int min = 0, max = 0;
ASSERT_RTNL();
@@ -159,11 +158,7 @@ static int alloc_netid(struct net *net, struct net *peer, int reqid)
max = reqid + 1;
}
- id = idr_alloc(&net->netns_ids, peer, min, max, GFP_KERNEL);
- if (id >= 0)
- rtnl_net_notifyid(net, RTM_NEWNSID, id);
-
- return id;
+ return idr_alloc(&net->netns_ids, peer, min, max, GFP_KERNEL);
}
/* This function is used by idr_for_each(). If net is equal to peer, the
@@ -179,34 +174,50 @@ static int net_eq_idr(int id, void *net, void *peer)
return 0;
}
-static int __peernet2id(struct net *net, struct net *peer, bool alloc)
+static int __peernet2id_alloc(struct net *net, struct net *peer, bool *alloc)
{
int id = idr_for_each(&net->netns_ids, net_eq_idr, peer);
+ bool alloc_it = *alloc;
ASSERT_RTNL();
+ *alloc = false;
+
/* Magic value for id 0. */
if (id == NET_ID_ZERO)
return 0;
if (id > 0)
return id;
- if (alloc) {
+ if (alloc_it) {
id = alloc_netid(net, peer, -1);
+ *alloc = true;
return id >= 0 ? id : NETNSA_NSID_NOT_ASSIGNED;
}
return NETNSA_NSID_NOT_ASSIGNED;
}
+static int __peernet2id(struct net *net, struct net *peer)
+{
+ bool no = false;
+
+ return __peernet2id_alloc(net, peer, &no);
+}
+
+static void rtnl_net_notifyid(struct net *net, int cmd, int id);
/* This function returns the id of a peer netns. If no id is assigned, one will
* be allocated and returned.
*/
int peernet2id_alloc(struct net *net, struct net *peer)
{
bool alloc = atomic_read(&peer->count) == 0 ? false : true;
+ int id;
- return __peernet2id(net, peer, alloc);
+ id = __peernet2id_alloc(net, peer, &alloc);
+ if (alloc && id >= 0)
+ rtnl_net_notifyid(net, RTM_NEWNSID, id);
+ return id;
}
EXPORT_SYMBOL(peernet2id_alloc);
@@ -361,7 +372,7 @@ static void cleanup_net(struct work_struct *work)
list_del_rcu(&net->list);
list_add_tail(&net->exit_list, &net_exit_list);
for_each_net(tmp) {
- int id = __peernet2id(tmp, net, false);
+ int id = __peernet2id(tmp, net);
if (id >= 0) {
rtnl_net_notifyid(tmp, RTM_DELNSID, id);
@@ -516,14 +527,16 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
if (IS_ERR(peer))
return PTR_ERR(peer);
- if (__peernet2id(net, peer, false) >= 0) {
+ if (__peernet2id(net, peer) >= 0) {
err = -EEXIST;
goto out;
}
err = alloc_netid(net, peer, nsid);
- if (err > 0)
+ if (err >= 0) {
+ rtnl_net_notifyid(net, RTM_NEWNSID, err);
err = 0;
+ }
out:
put_net(peer);
return err;
@@ -588,7 +601,7 @@ static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh)
goto out;
}
- id = __peernet2id(net, peer, false);
+ id = __peernet2id(net, peer);
err = rtnl_net_fill(msg, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
RTM_GETNSID, net, id);
if (err < 0)