Commit e8368d9e authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'net-Ease-to-follow-an-interface-that-moves-to-another-netns' 



Nicolas Dichtel says:

====================
net: Ease to follow an interface that moves to another netns

The goal of this series is to ease the user to follow an interface that
moves to another netns.

After this series, with a patched iproute2:

$ ip netns
bar
foo
$ ip monitor link &
$ ip link set dummy0 netns foo
Deleted 5: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default
    link/ether 6e:a7:82:35:96:46 brd ff:ff:ff:ff:ff:ff new-nsid 0 new-ifindex 6

=> new nsid: 0, new ifindex: 6 (was 5 in the previous netns)

$ ip link set eth1 netns bar
Deleted 3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default
    link/ether 52:54:01:12:34:57 brd ff:ff:ff:ff:ff:ff new-nsid 1 new-ifindex 3

=> new nsid: 1, new ifindex: 3 (same ifindex)

$ ip netns
bar (id: 1)
foo (id: 0)
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 6b9e6547 38e01b30

include/linux/rtnetlink.h

+3 −2
Original line number Original line Diff line number Diff line
@@ -19,10 +19,11 @@ extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, 




void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change, gfp_t flags);

void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change, gfp_t flags);

void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,

void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,

			 gfp_t flags, int *new_nsid);

			 gfp_t flags, int *new_nsid, int new_ifindex);

struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,

struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,

				       unsigned change, u32 event,

				       unsigned change, u32 event,

				       gfp_t flags, int *new_nsid);

				       gfp_t flags, int *new_nsid,

				       int new_ifindex);

void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev,

void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev,

		       gfp_t flags);

		       gfp_t flags);

include/uapi/linux/if_link.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -163,6 +163,7 @@ enum { 
	IFLA_IF_NETNSID,

	IFLA_IF_NETNSID,

	IFLA_CARRIER_UP_COUNT,

	IFLA_CARRIER_UP_COUNT,

	IFLA_CARRIER_DOWN_COUNT,

	IFLA_CARRIER_DOWN_COUNT,

	IFLA_NEW_IFINDEX,

	__IFLA_MAX

	__IFLA_MAX

};

};

net/core/dev.c

+12 −10
Original line number Original line Diff line number Diff line
@@ -7360,7 +7360,7 @@ static void rollback_registered_many(struct list_head *head) 
		if (!dev->rtnl_link_ops ||

		if (!dev->rtnl_link_ops ||

		    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)

		    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)

			skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0,

			skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0,

						     GFP_KERNEL, NULL);

						     GFP_KERNEL, NULL, 0);





		/*

		/*

		 *	Flush the unicast and multicast chains

		 *	Flush the unicast and multicast chains
@@ -8473,7 +8473,7 @@ EXPORT_SYMBOL(unregister_netdev); 




int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)

int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)

{

{

	int err, new_nsid;

	int err, new_nsid, new_ifindex;





	ASSERT_RTNL();

	ASSERT_RTNL();
@@ -8529,11 +8529,16 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char 
	call_netdevice_notifiers(NETDEV_UNREGISTER, dev);

	call_netdevice_notifiers(NETDEV_UNREGISTER, dev);

	rcu_barrier();

	rcu_barrier();

	call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);

	call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);

	if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net)



	new_nsid = peernet2id_alloc(dev_net(dev), net);

	new_nsid = peernet2id_alloc(dev_net(dev), net);

	/* If there is an ifindex conflict assign a new one */

	if (__dev_get_by_index(net, dev->ifindex))

		new_ifindex = dev_new_index(net);

	else

	else

		new_nsid = peernet2id(dev_net(dev), net);

		new_ifindex = dev->ifindex;

	rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid);



	rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid,

			    new_ifindex);





	/*

	/*

	 *	Flush the unicast and multicast chains

	 *	Flush the unicast and multicast chains
@@ -8547,10 +8552,7 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char 




	/* Actually switch the network namespace */

	/* Actually switch the network namespace */

	dev_net_set(dev, net);

	dev_net_set(dev, net);



	dev->ifindex = new_ifindex;

	/* If there is an ifindex conflict assign a new one */

	if (__dev_get_by_index(net, dev->ifindex))

		dev->ifindex = dev_new_index(net);





	/* Send a netdev-add uevent to the new namespace */

	/* Send a netdev-add uevent to the new namespace */

	kobject_uevent(&dev->dev.kobj, KOBJ_ADD);

	kobject_uevent(&dev->dev.kobj, KOBJ_ADD);

net/core/rtnetlink.c

+20 −11
Original line number Original line Diff line number Diff line
@@ -988,6 +988,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev, 
	       + rtnl_xdp_size() /* IFLA_XDP */

	       + rtnl_xdp_size() /* IFLA_XDP */

	       + nla_total_size(4)  /* IFLA_EVENT */

	       + nla_total_size(4)  /* IFLA_EVENT */

	       + nla_total_size(4)  /* IFLA_NEW_NETNSID */

	       + nla_total_size(4)  /* IFLA_NEW_NETNSID */

	       + nla_total_size(4)  /* IFLA_NEW_IFINDEX */

	       + nla_total_size(1)  /* IFLA_PROTO_DOWN */

	       + nla_total_size(1)  /* IFLA_PROTO_DOWN */

	       + nla_total_size(4)  /* IFLA_IF_NETNSID */

	       + nla_total_size(4)  /* IFLA_IF_NETNSID */

	       + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */

	       + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
@@ -1511,7 +1512,8 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, 
			    struct net_device *dev, struct net *src_net,

			    struct net_device *dev, struct net *src_net,

			    int type, u32 pid, u32 seq, u32 change,

			    int type, u32 pid, u32 seq, u32 change,

			    unsigned int flags, u32 ext_filter_mask,

			    unsigned int flags, u32 ext_filter_mask,

			    u32 event, int *new_nsid, int tgt_netnsid)

			    u32 event, int *new_nsid, int new_ifindex,

			    int tgt_netnsid)

{

{

	struct ifinfomsg *ifm;

	struct ifinfomsg *ifm;

	struct nlmsghdr *nlh;

	struct nlmsghdr *nlh;
@@ -1608,6 +1610,10 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, 
	if (new_nsid &&

	if (new_nsid &&

	    nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)

	    nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)

		goto nla_put_failure;

		goto nla_put_failure;

	if (new_ifindex &&

	    nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)

		goto nla_put_failure;







	rcu_read_lock();

	rcu_read_lock();

	if (rtnl_fill_link_af(skb, dev, ext_filter_mask))

	if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
@@ -1853,7 +1859,7 @@ static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 
					       NETLINK_CB(cb->skb).portid,

					       NETLINK_CB(cb->skb).portid,

					       cb->nlh->nlmsg_seq, 0,

					       cb->nlh->nlmsg_seq, 0,

					       flags,

					       flags,

					       ext_filter_mask, 0, NULL,

					       ext_filter_mask, 0, NULL, 0,

					       netnsid);

					       netnsid);





			if (err < 0) {

			if (err < 0) {
@@ -3088,7 +3094,7 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh, 
	err = rtnl_fill_ifinfo(nskb, dev, net,

	err = rtnl_fill_ifinfo(nskb, dev, net,

			       RTM_NEWLINK, NETLINK_CB(skb).portid,

			       RTM_NEWLINK, NETLINK_CB(skb).portid,

			       nlh->nlmsg_seq, 0, 0, ext_filter_mask,

			       nlh->nlmsg_seq, 0, 0, ext_filter_mask,

			       0, NULL, netnsid);

			       0, NULL, 0, netnsid);

	if (err < 0) {

	if (err < 0) {

		/* -EMSGSIZE implies BUG in if_nlmsg_size */

		/* -EMSGSIZE implies BUG in if_nlmsg_size */

		WARN_ON(err == -EMSGSIZE);

		WARN_ON(err == -EMSGSIZE);
@@ -3184,7 +3190,8 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 




struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,

struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,

				       unsigned int change,

				       unsigned int change,

				       u32 event, gfp_t flags, int *new_nsid)

				       u32 event, gfp_t flags, int *new_nsid,

				       int new_ifindex)

{

{

	struct net *net = dev_net(dev);

	struct net *net = dev_net(dev);

	struct sk_buff *skb;

	struct sk_buff *skb;
@@ -3197,7 +3204,7 @@ struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 




	err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),

	err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),

			       type, 0, 0, change, 0, 0, event,

			       type, 0, 0, change, 0, 0, event,

			       new_nsid, -1);

			       new_nsid, new_ifindex, -1);

	if (err < 0) {

	if (err < 0) {

		/* -EMSGSIZE implies BUG in if_nlmsg_size() */

		/* -EMSGSIZE implies BUG in if_nlmsg_size() */

		WARN_ON(err == -EMSGSIZE);

		WARN_ON(err == -EMSGSIZE);
@@ -3220,14 +3227,15 @@ void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags) 




static void rtmsg_ifinfo_event(int type, struct net_device *dev,

static void rtmsg_ifinfo_event(int type, struct net_device *dev,

			       unsigned int change, u32 event,

			       unsigned int change, u32 event,

			       gfp_t flags, int *new_nsid)

			       gfp_t flags, int *new_nsid, int new_ifindex)

{

{

	struct sk_buff *skb;

	struct sk_buff *skb;





	if (dev->reg_state != NETREG_REGISTERED)

	if (dev->reg_state != NETREG_REGISTERED)

		return;

		return;





	skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid);

	skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,

				     new_ifindex);

	if (skb)

	if (skb)

		rtmsg_ifinfo_send(skb, dev, flags);

		rtmsg_ifinfo_send(skb, dev, flags);

}

}
@@ -3235,14 +3243,15 @@ static void rtmsg_ifinfo_event(int type, struct net_device *dev, 
void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,

void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,

		  gfp_t flags)

		  gfp_t flags)

{

{

	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, NULL);

	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,

			   NULL, 0);

}

}





void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,

void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,

			 gfp_t flags, int *new_nsid)

			 gfp_t flags, int *new_nsid, int new_ifindex)

{

{

	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,

	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,

			   new_nsid);

			   new_nsid, new_ifindex);

}

}





static int nlmsg_populate_fdb_fill(struct sk_buff *skb,

static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
@@ -4642,7 +4651,7 @@ static int rtnetlink_event(struct notifier_block *this, unsigned long event, voi 
	case NETDEV_CHANGELOWERSTATE:

	case NETDEV_CHANGELOWERSTATE:

	case NETDEV_CHANGE_TX_QUEUE_LEN:

	case NETDEV_CHANGE_TX_QUEUE_LEN:

		rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),

		rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),

				   GFP_KERNEL, NULL);

				   GFP_KERNEL, NULL, 0);

		break;

		break;

	default:

	default:

		break;

		break;

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