[Devel] [PATCH RFC 26/31] net: Make the netlink methods in rtnetlink handle multiple network namespaces

[Eric W. Biederman]

From: Eric W. Biederman <ebiederm at xmission.com> - unquoted

It turns out after a quick audit that except for removing the checks
there is really nothing to do here.

Signed-off-by: Eric W. Biederman <ebiederm at xmission.com>
---
 net/core/rtnetlink.c |   21 +++------------------
 1 files changed, 3 insertions(+), 18 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 29a81bf..0a42258 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -409,9 +409,6 @@ static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 	int s_idx = cb->args[0];
 	struct net_device *dev;
 
-	if (!net_eq(net, init_net()))
-		return 0;
-
 	read_lock(&per_net(dev_base_lock, net));
 	for (dev=per_net(dev_base, net), idx=0; dev; dev = dev->next, idx++) {
 		if (idx < s_idx)
@@ -446,9 +443,6 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 	struct nlattr *tb[IFLA_MAX+1];
 	char ifname[IFNAMSIZ];
 
-	if (!net_eq(net, init_net()))
-		return -EINVAL;
-
 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 	if (err < 0)
 		goto errout;
@@ -622,9 +616,6 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 	int iw_buf_len = 0;
 	int err;
 
-	if (!net_eq(net, init_net()))
-		return -EINVAL;
-
 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 	if (err < 0)
 		return err;
@@ -673,13 +664,9 @@ errout:
 
 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 {
-	net_t net = skb->sk->sk_net;
 	int idx;
 	int s_idx = cb->family;
 
-	if (!net_eq(net, init_net()))
-		return 0;
-
 	if (s_idx == 0)
 		s_idx = 1;
 	for (idx=1; idx<NPROTO; idx++) {
@@ -701,6 +688,7 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 
 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 {
+	net_t net = dev->nd_net;
 	struct sk_buff *skb;
 	int err = -ENOBUFS;
 
@@ -712,10 +700,10 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 	/* failure implies BUG in if_nlmsg_size() */
 	BUG_ON(err < 0);
 
-	err = rtnl_notify(skb, init_net(), 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
+	err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
 errout:
 	if (err < 0)
-		rtnl_set_sk_err(init_net(), RTNLGRP_LINK, err);
+		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
 }
 
 /* Protected by RTNL sempahore.  */
@@ -862,9 +850,6 @@ static int rtnetlink_event(struct notifier_block *this, unsigned long event, voi
 {
 	struct net_device *dev = ptr;
 
-	if (!net_eq(dev->nd_net, init_net()))
-		return NOTIFY_DONE;
-
 	switch (event) {
 	case NETDEV_UNREGISTER:
 		rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
-- 
1.4.4.1.g278f

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