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netns: allow to dump netns ids

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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>
This commit is contained in:
Nicolas Dichtel 2015-04-07 11:51:54 +02:00 committed by David S. Miller
parent 9a9634545c
commit a143c40c32
1 changed files with 48 additions and 1 deletions
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49
net/core/net_namespace.c
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@ -616,6 +616,52 @@ out:
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 @@ static int __init net_ns_init(void)
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;
}