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Commit 9a963454 authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller
Browse files

netns: notify netns id events 



With this patch, netns ids that are created and deleted are advertised into the
group RTNLGRP_NSID.

Because callers of rtnl_net_notifyid() already know the id of the peer, there is
no need to call __peernet2id() in rtnl_net_fill().

Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b111e4e1

include/uapi/linux/rtnetlink.h

+4 −0
Original line number Diff line number Diff line
@@ -134,6 +134,8 @@ enum { 


	RTM_NEWNSID = 88,

#define RTM_NEWNSID RTM_NEWNSID

	RTM_DELNSID = 89,

#define RTM_DELNSID RTM_DELNSID

	RTM_GETNSID = 90,

#define RTM_GETNSID RTM_GETNSID
@@ -635,6 +637,8 @@ enum rtnetlink_groups { 
#define RTNLGRP_MDB		RTNLGRP_MDB

	RTNLGRP_MPLS_ROUTE,

#define RTNLGRP_MPLS_ROUTE	RTNLGRP_MPLS_ROUTE

	RTNLGRP_NSID,

#define RTNLGRP_NSID		RTNLGRP_NSID

	__RTNLGRP_MAX

};

#define RTNLGRP_MAX	(__RTNLGRP_MAX - 1)

net/core/net_namespace.c

+44 −8
Original line number Diff line number Diff line
@@ -148,9 +148,11 @@ static void ops_free_list(const struct pernet_operations *ops, 
	}

}



static void rtnl_net_notifyid(struct net *net, struct net *peer, int cmd,

			      int id);

static int alloc_netid(struct net *net, struct net *peer, int reqid)

{

	int min = 0, max = 0;

	int min = 0, max = 0, id;



	ASSERT_RTNL();
@@ -159,7 +161,11 @@ static int alloc_netid(struct net *net, struct net *peer, int reqid) 
		max = reqid + 1;

	}



	return idr_alloc(&net->netns_ids, peer, min, max, GFP_KERNEL);

	id = idr_alloc(&net->netns_ids, peer, min, max, GFP_KERNEL);

	if (id >= 0)

		rtnl_net_notifyid(net, peer, RTM_NEWNSID, id);



	return id;

}



/* This function is used by idr_for_each(). If net is equal to peer, the
@@ -359,9 +365,11 @@ static void cleanup_net(struct work_struct *work) 
		for_each_net(tmp) {

			int id = __peernet2id(tmp, net, false);



			if (id >= 0)

			if (id >= 0) {

				rtnl_net_notifyid(tmp, net, RTM_DELNSID, id);

				idr_remove(&tmp->netns_ids, id);

			}

		}

		idr_destroy(&net->netns_ids);



	}
@@ -531,7 +539,8 @@ static int rtnl_net_get_size(void) 
}



static int rtnl_net_fill(struct sk_buff *skb, u32 portid, u32 seq, int flags,

			 int cmd, struct net *net, struct net *peer)

			 int cmd, struct net *net, struct net *peer,

			 int nsid)

{

	struct nlmsghdr *nlh;

	struct rtgenmsg *rth;
@@ -546,9 +555,13 @@ static int rtnl_net_fill(struct sk_buff *skb, u32 portid, u32 seq, int flags, 
	rth = nlmsg_data(nlh);

	rth->rtgen_family = AF_UNSPEC;



	if (nsid >= 0) {

		id = nsid;

	} else {

		id = __peernet2id(net, peer, false);

		if  (id < 0)

			id = NETNSA_NSID_NOT_ASSIGNED;

	}

	if (nla_put_s32(skb, NETNSA_NSID, id))

		goto nla_put_failure;
@@ -589,7 +602,7 @@ static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh) 
	}



	err = rtnl_net_fill(msg, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,

			    RTM_GETNSID, net, peer);

			    RTM_GETNSID, net, peer, -1);

	if (err < 0)

		goto err_out;
@@ -603,6 +616,29 @@ static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh) 
	return err;

}



static void rtnl_net_notifyid(struct net *net, struct net *peer, int cmd,

			      int id)

{

	struct sk_buff *msg;

	int err = -ENOMEM;



	msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL);

	if (!msg)

		goto out;



	err = rtnl_net_fill(msg, 0, 0, 0, cmd, net, peer, id);

	if (err < 0)

		goto err_out;



	rtnl_notify(msg, net, 0, RTNLGRP_NSID, NULL, 0);

	return;



err_out:

	nlmsg_free(msg);

out:

	rtnl_set_sk_err(net, RTNLGRP_NSID, err);

}



static int __init net_ns_init(void)

{

	struct net_generic *ng;