netns: allow to dump netns ids
Which this patch, it's possible to dump the list of ids allocated for peer
netns.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index b3b5f22..a3abb719 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -616,6 +616,52 @@
return err;
}
+struct rtnl_net_dump_cb {
+ struct net *net;
+ struct sk_buff *skb;
+ struct netlink_callback *cb;
+ int idx;
+ int s_idx;
+};
+
+static int rtnl_net_dumpid_one(int id, void *peer, void *data)
+{
+ struct rtnl_net_dump_cb *net_cb = (struct rtnl_net_dump_cb *)data;
+ int ret;
+
+ if (net_cb->idx < net_cb->s_idx)
+ goto cont;
+
+ ret = rtnl_net_fill(net_cb->skb, NETLINK_CB(net_cb->cb->skb).portid,
+ net_cb->cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ RTM_NEWNSID, net_cb->net, peer, id);
+ if (ret < 0)
+ return ret;
+
+cont:
+ net_cb->idx++;
+ return 0;
+}
+
+static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct rtnl_net_dump_cb net_cb = {
+ .net = net,
+ .skb = skb,
+ .cb = cb,
+ .idx = 0,
+ .s_idx = cb->args[0],
+ };
+
+ ASSERT_RTNL();
+
+ idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb);
+
+ cb->args[0] = net_cb.idx;
+ return skb->len;
+}
+
static void rtnl_net_notifyid(struct net *net, struct net *peer, int cmd,
int id)
{
@@ -673,7 +719,8 @@
register_pernet_subsys(&net_ns_ops);
rtnl_register(PF_UNSPEC, RTM_NEWNSID, rtnl_net_newid, NULL, NULL);
- rtnl_register(PF_UNSPEC, RTM_GETNSID, rtnl_net_getid, NULL, NULL);
+ rtnl_register(PF_UNSPEC, RTM_GETNSID, rtnl_net_getid, rtnl_net_dumpid,
+ NULL);
return 0;
}