netns: always provide the id to rtnl_net_fill()

The goal of this commit is to prepare the rework of the locking of nsnid
protection.
After this patch, rtnl_net_notifyid() will not call anymore __peernet2id(),
ie no idr_* operation into this function.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 294d387..37c68bb 100644 (file)
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -147,8 +147,7 @@ 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 void rtnl_net_notifyid(struct net *net, int cmd, int id);
 static int alloc_netid(struct net *net, struct net *peer, int reqid)
 {
        int min = 0, max = 0, id;
@@ -162,7 +161,7 @@ static int alloc_netid(struct net *net, struct net *peer, int reqid)
 
        id = idr_alloc(&net->netns_ids, peer, min, max, GFP_KERNEL);
        if (id >= 0)
-               rtnl_net_notifyid(net, peer, RTM_NEWNSID, id);
+               rtnl_net_notifyid(net, RTM_NEWNSID, id);
 
        return id;
 }
@@ -365,7 +364,7 @@ static void cleanup_net(struct work_struct *work)
                        int id = __peernet2id(tmp, net, false);
 
                        if (id >= 0) {
-                               rtnl_net_notifyid(tmp, net, RTM_DELNSID, id);
+                               rtnl_net_notifyid(tmp, RTM_DELNSID, id);
                                idr_remove(&tmp->netns_ids, id);
                        }
                }
@@ -538,14 +537,10 @@ 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 nsid)
+                        int cmd, struct net *net, int nsid)
 {
        struct nlmsghdr *nlh;
        struct rtgenmsg *rth;
-       int id;
-
-       ASSERT_RTNL();
 
        nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rth), flags);
        if (!nlh)
@@ -554,11 +549,7 @@ 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 (nla_put_s32(skb, NETNSA_NSID, id))
+       if (nla_put_s32(skb, NETNSA_NSID, nsid))
                goto nla_put_failure;
 
        nlmsg_end(skb, nlh);
@@ -575,7 +566,7 @@ static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh)
        struct nlattr *tb[NETNSA_MAX + 1];
        struct sk_buff *msg;
        struct net *peer;
-       int err;
+       int err, id;
 
        err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX,
                          rtnl_net_policy);
@@ -597,8 +588,9 @@ static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh)
                goto out;
        }
 
+       id = __peernet2id(net, peer, false);
        err = rtnl_net_fill(msg, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
-                           RTM_GETNSID, net, peer, -1);
+                           RTM_GETNSID, net, id);
        if (err < 0)
                goto err_out;
 
@@ -630,7 +622,7 @@ static int rtnl_net_dumpid_one(int id, void *peer, void *data)
 
        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);
+                           RTM_NEWNSID, net_cb->net, id);
        if (ret < 0)
                return ret;
 
@@ -658,8 +650,7 @@ static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb)
        return skb->len;
 }
 
-static void rtnl_net_notifyid(struct net *net, struct net *peer, int cmd,
-                             int id)
+static void rtnl_net_notifyid(struct net *net, int cmd, int id)
 {
        struct sk_buff *msg;
        int err = -ENOMEM;
@@ -668,7 +659,7 @@ static void rtnl_net_notifyid(struct net *net, struct net *peer, int cmd,
        if (!msg)
                goto out;
 
-       err = rtnl_net_fill(msg, 0, 0, 0, cmd, net, peer, id);
+       err = rtnl_net_fill(msg, 0, 0, 0, cmd, net, id);
        if (err < 0)
                goto err_out;