netns bridge: allow bridges in netns!

Bridge as netdevice doesn't cross netns boundaries.

Bridge ports and bridge itself live in same netns.

Notifiers are fixed.

netns propagated from userspace socket for setup and teardown.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Stephen Hemminger <shemming@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 25 insertions, 34 deletions

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 4f52c3d..22ba863 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -178,5 +178,6 @@ void br_dev_setup(struct net_device *dev)
 	dev->priv_flags = IFF_EBRIDGE;
 
 	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
-			NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX;
+			NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
+			NETIF_F_NETNS_LOCAL;
 }
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 63c18aa..66c4f71 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -168,7 +168,7 @@ static void del_br(struct net_bridge *br)
 	unregister_netdevice(br->dev);
 }
 
-static struct net_device *new_bridge_dev(const char *name)
+static struct net_device *new_bridge_dev(struct net *net, const char *name)
 {
 	struct net_bridge *br;
 	struct net_device *dev;
@@ -178,6 +178,7 @@ static struct net_device *new_bridge_dev(const char *name)
 
 	if (!dev)
 		return NULL;
+	dev_net_set(dev, net);
 
 	br = netdev_priv(dev);
 	br->dev = dev;
@@ -262,12 +263,12 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
 	return p;
 }
 
-int br_add_bridge(const char *name)
+int br_add_bridge(struct net *net, const char *name)
 {
 	struct net_device *dev;
 	int ret;
 
-	dev = new_bridge_dev(name);
+	dev = new_bridge_dev(net, name);
 	if (!dev)
 		return -ENOMEM;
 
@@ -294,13 +295,13 @@ out_free:
 	goto out;
 }
 
-int br_del_bridge(const char *name)
+int br_del_bridge(struct net *net, const char *name)
 {
 	struct net_device *dev;
 	int ret = 0;
 
 	rtnl_lock();
-	dev = __dev_get_by_name(&init_net, name);
+	dev = __dev_get_by_name(net, name);
 	if (dev == NULL)
 		ret =  -ENXIO; 	/* Could not find device */
 
diff --git a/net/bridge/br_ioctl.c b/net/bridge/br_ioctl.c
index eeee218..3ec1c63 100644
--- a/net/bridge/br_ioctl.c
+++ b/net/bridge/br_ioctl.c
@@ -21,12 +21,12 @@
 #include "br_private.h"
 
 /* called with RTNL */
-static int get_bridge_ifindices(int *indices, int num)
+static int get_bridge_ifindices(struct net *net, int *indices, int num)
 {
 	struct net_device *dev;
 	int i = 0;
 
-	for_each_netdev(&init_net, dev) {
+	for_each_netdev(net, dev) {
 		if (i >= num)
 			break;
 		if (dev->priv_flags & IFF_EBRIDGE)
@@ -89,7 +89,7 @@ static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
 	if (!capable(CAP_NET_ADMIN))
 		return -EPERM;
 
-	dev = dev_get_by_index(&init_net, ifindex);
+	dev = dev_get_by_index(dev_net(br->dev), ifindex);
 	if (dev == NULL)
 		return -EINVAL;
 
@@ -309,7 +309,7 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 	return -EOPNOTSUPP;
 }
 
-static int old_deviceless(void __user *uarg)
+static int old_deviceless(struct net *net, void __user *uarg)
 {
 	unsigned long args[3];
 
@@ -331,7 +331,7 @@ static int old_deviceless(void __user *uarg)
 		if (indices == NULL)
 			return -ENOMEM;
 
-		args[2] = get_bridge_ifindices(indices, args[2]);
+		args[2] = get_bridge_ifindices(net, indices, args[2]);
 
 		ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
 			? -EFAULT : args[2];
@@ -354,9 +354,9 @@ static int old_deviceless(void __user *uarg)
 		buf[IFNAMSIZ-1] = 0;
 
 		if (args[0] == BRCTL_ADD_BRIDGE)
-			return br_add_bridge(buf);
+			return br_add_bridge(net, buf);
 
-		return br_del_bridge(buf);
+		return br_del_bridge(net, buf);
 	}
 	}
 
@@ -368,7 +368,7 @@ int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uar
 	switch (cmd) {
 	case SIOCGIFBR:
 	case SIOCSIFBR:
-		return old_deviceless(uarg);
+		return old_deviceless(net, uarg);
 
 	case SIOCBRADDBR:
 	case SIOCBRDELBR:
@@ -383,9 +383,9 @@ int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uar
 
 		buf[IFNAMSIZ-1] = 0;
 		if (cmd == SIOCBRADDBR)
-			return br_add_bridge(buf);
+			return br_add_bridge(net, buf);
 
-		return br_del_bridge(buf);
+		return br_del_bridge(net, buf);
 	}
 	}
 	return -EOPNOTSUPP;
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index f155e6c..ba7be19 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -82,6 +82,7 @@ nla_put_failure:
  */
 void br_ifinfo_notify(int event, struct net_bridge_port *port)
 {
+	struct net *net = dev_net(port->dev);
 	struct sk_buff *skb;
 	int err = -ENOBUFS;
 
@@ -97,10 +98,10 @@ void br_ifinfo_notify(int event, struct net_bridge_port *port)
 		kfree_skb(skb);
 		goto errout;
 	}
-	err = rtnl_notify(skb, &init_net,0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
+	err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
 errout:
 	if (err < 0)
-		rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
+		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
 }
 
 /*
@@ -112,11 +113,8 @@ static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 	struct net_device *dev;
 	int idx;
 
-	if (net != &init_net)
-		return 0;
-
 	idx = 0;
-	for_each_netdev(&init_net, dev) {
+	for_each_netdev(net, dev) {
 		/* not a bridge port */
 		if (dev->br_port == NULL || idx < cb->args[0])
 			goto skip;
@@ -147,9 +145,6 @@ static int br_rtm_setlink(struct sk_buff *skb,  struct nlmsghdr *nlh, void *arg)
 	struct net_bridge_port *p;
 	u8 new_state;
 
-	if (net != &init_net)
-		return -EINVAL;
-
 	if (nlmsg_len(nlh) < sizeof(*ifm))
 		return -EINVAL;
 
@@ -165,7 +160,7 @@ static int br_rtm_setlink(struct sk_buff *skb,  struct nlmsghdr *nlh, void *arg)
 	if (new_state > BR_STATE_BLOCKING)
 		return -EINVAL;
 
-	dev = __dev_get_by_index(&init_net, ifm->ifi_index);
+	dev = __dev_get_by_index(net, ifm->ifi_index);
 	if (!dev)
 		return -ENODEV;
 
diff --git a/net/bridge/br_notify.c b/net/bridge/br_notify.c
index 76340bd..763a3ec 100644
--- a/net/bridge/br_notify.c
+++ b/net/bridge/br_notify.c
@@ -35,9 +35,6 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
 	struct net_bridge_port *p = dev->br_port;
 	struct net_bridge *br;
 
-	if (!net_eq(dev_net(dev), &init_net))
-		return NOTIFY_DONE;
-
 	/* not a port of a bridge */
 	if (p == NULL)
 		return NOTIFY_DONE;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index c3dc18d..51eaeaa 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -178,8 +178,8 @@ extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb);
 
 /* br_if.c */
 extern void br_port_carrier_check(struct net_bridge_port *p);
-extern int br_add_bridge(const char *name);
-extern int br_del_bridge(const char *name);
+extern int br_add_bridge(struct net *net, const char *name);
+extern int br_del_bridge(struct net *net, const char *name);
 extern void br_cleanup_bridges(void);
 extern int br_add_if(struct net_bridge *br,
 	      struct net_device *dev);
diff --git a/net/bridge/br_stp_bpdu.c b/net/bridge/br_stp_bpdu.c
index 8b200f9..81ae40b 100644
--- a/net/bridge/br_stp_bpdu.c
+++ b/net/bridge/br_stp_bpdu.c
@@ -140,9 +140,6 @@ void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 	struct net_bridge *br;
 	const unsigned char *buf;
 
-	if (!net_eq(dev_net(dev), &init_net))
-		goto err;
-
 	if (!p)
 		goto err;