Commit 26ba9e8c authored by David S. Miller's avatar David S. Miller

Merge branch 'netns-next'

Nicolas Dichtel says:

====================
netns: enhance netlink interface for nsid

The first patch is a small cleanup. The second patch implements notifications
for netns id events. And the last one allows to dump existing netns id from
userland.

iproute2 patches are available, I can send them on demand.

v2: drop the first patch (the fix is now in net-next)
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents e0e8db2f a143c40c
......@@ -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)
......
......@@ -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
......@@ -359,8 +365,10 @@ 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;
id = __peernet2id(net, peer, false);
if (id < 0)
id = NETNSA_NSID_NOT_ASSIGNED;
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;
......@@ -565,8 +578,8 @@ static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh)
struct net *net = sock_net(skb->sk);
struct nlattr *tb[NETNSA_MAX + 1];
struct sk_buff *msg;
int err = -ENOBUFS;
struct net *peer;
int err;
err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX,
rtnl_net_policy);
......@@ -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 +616,75 @@ 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)
{
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;
......@@ -637,7 +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;
}
......
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