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netns: fix NLM_F_ECHO mechanism for RTM_NEWNSID 

The flag NLM_F_ECHO aims to reply to the user the message notified to all
listeners.
It was not the case with the command RTM_NEWNSID, let's fix this.

Fixes: 0c7aecd4bd ("netns: add rtnl cmd to add and get peer netns ids")
Reported-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Guillaume Nault <gnault@redhat.com>
Tested-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
This commit is contained in:
Nicolas Dichtel 2019-10-09 11:19:10 +02:00 committed by Jakub Kicinski
parent e0ae2c578d
commit 993e4c929a
1 changed files with 11 additions and 6 deletions
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17
net/core/net_namespace.c
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@ -245,7 +245,8 @@ static int __peernet2id(struct net *net, struct net *peer)
return __peernet2id_alloc(net, peer, &no);
}
static void rtnl_net_notifyid(struct net *net, int cmd, int id);
static void rtnl_net_notifyid(struct net *net, int cmd, int id, u32 portid,
struct nlmsghdr *nlh);
/* This function returns the id of a peer netns. If no id is assigned, one will
* be allocated and returned.
*/
@ -268,7 +269,7 @@ int peernet2id_alloc(struct net *net, struct net *peer)
id = __peernet2id_alloc(net, peer, &alloc);
spin_unlock_bh(&net->nsid_lock);
if (alloc && id >= 0)
rtnl_net_notifyid(net, RTM_NEWNSID, id);
rtnl_net_notifyid(net, RTM_NEWNSID, id, 0, NULL);
if (alive)
put_net(peer);
return id;
@ -532,7 +533,7 @@ static void unhash_nsid(struct net *net, struct net *last)
idr_remove(&tmp->netns_ids, id);
spin_unlock_bh(&tmp->nsid_lock);
if (id >= 0)
rtnl_net_notifyid(tmp, RTM_DELNSID, id);
rtnl_net_notifyid(tmp, RTM_DELNSID, id, 0, NULL);
if (tmp == last)
break;
}
@ -764,7 +765,8 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh,
err = alloc_netid(net, peer, nsid);
spin_unlock_bh(&net->nsid_lock);
if (err >= 0) {
rtnl_net_notifyid(net, RTM_NEWNSID, err);
rtnl_net_notifyid(net, RTM_NEWNSID, err, NETLINK_CB(skb).portid,
nlh);
err = 0;
} else if (err == -ENOSPC && nsid >= 0) {
err = -EEXIST;
@ -1051,9 +1053,12 @@ end:
return err < 0 ? err : skb->len;
}
static void rtnl_net_notifyid(struct net *net, int cmd, int id)
static void rtnl_net_notifyid(struct net *net, int cmd, int id, u32 portid,
struct nlmsghdr *nlh)
{
struct net_fill_args fillargs = {
.portid = portid,
.seq = nlh ? nlh->nlmsg_seq : 0,
.cmd = cmd,
.nsid = id,
};
@ -1068,7 +1073,7 @@ static void rtnl_net_notifyid(struct net *net, int cmd, int id)
if (err < 0)
goto err_out;
rtnl_notify(msg, net, 0, RTNLGRP_NSID, NULL, 0);
rtnl_notify(msg, net, portid, RTNLGRP_NSID, nlh, 0);
return;
err_out: