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netns: notify netns id events

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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: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel 2015-04-07 11:51:53 +02:00 committed by David S. Miller
parent b111e4e111
commit 9a9634545c
2 changed files with 48 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/uapi/linux/rtnetlink.h
View File

@ -134,6 +134,8 @@ enum {
RTM_NEWNSID = 88, RTM_NEWNSID = 88,
#define RTM_NEWNSID RTM_NEWNSID #define RTM_NEWNSID RTM_NEWNSID
RTM_DELNSID = 89,
#define RTM_DELNSID RTM_DELNSID
RTM_GETNSID = 90, RTM_GETNSID = 90,
#define RTM_GETNSID RTM_GETNSID #define RTM_GETNSID RTM_GETNSID
@ -635,6 +637,8 @@ enum rtnetlink_groups {
#define RTNLGRP_MDB RTNLGRP_MDB #define RTNLGRP_MDB RTNLGRP_MDB
RTNLGRP_MPLS_ROUTE, RTNLGRP_MPLS_ROUTE,
#define RTNLGRP_MPLS_ROUTE RTNLGRP_MPLS_ROUTE #define RTNLGRP_MPLS_ROUTE RTNLGRP_MPLS_ROUTE
RTNLGRP_NSID,
#define RTNLGRP_NSID RTNLGRP_NSID
__RTNLGRP_MAX __RTNLGRP_MAX
}; };
#define RTNLGRP_MAX (__RTNLGRP_MAX - 1) #define RTNLGRP_MAX (__RTNLGRP_MAX - 1)

52
net/core/net_namespace.c
View File

@ -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) 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(); ASSERT_RTNL();
@ -159,7 +161,11 @@ static int alloc_netid(struct net *net, struct net *peer, int reqid)
max = reqid + 1; 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 /* 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) { for_each_net(tmp) {
int id = __peernet2id(tmp, net, false); 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_remove(&tmp->netns_ids, id);
}
} }
idr_destroy(&net->netns_ids); 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, 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 nlmsghdr *nlh;
struct rtgenmsg *rth; 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 = nlmsg_data(nlh);
rth->rtgen_family = AF_UNSPEC; rth->rtgen_family = AF_UNSPEC;
id = __peernet2id(net, peer, false); if (nsid >= 0) {
if (id < 0) id = nsid;
id = NETNSA_NSID_NOT_ASSIGNED; } else {
id = __peernet2id(net, peer, false);
if (id < 0)
id = NETNSA_NSID_NOT_ASSIGNED;
}
if (nla_put_s32(skb, NETNSA_NSID, id)) if (nla_put_s32(skb, NETNSA_NSID, id))
goto nla_put_failure; 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, 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) if (err < 0)
goto err_out; goto err_out;
@ -603,6 +616,29 @@ out:
return err; 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) static int __init net_ns_init(void)
{ {
struct net_generic *ng; struct net_generic *ng;