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Commit a143c40c authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller
Browse files

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: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9a963454

net/core/net_namespace.c

+48 −1
Original line number Diff line number Diff line
@@ -616,6 +616,52 @@ static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh) 
	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;

}