These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

1 files changed, 1027 insertions, 0 deletions

diff --git a/kernel/drivers/net/vrf.c b/kernel/drivers/net/vrf.c
new file mode 100644
index 000000000..0a242b200
--- /dev/null
+++ b/kernel/drivers/net/vrf.c
@@ -0,0 +1,1027 @@
+/*
+ * vrf.c: device driver to encapsulate a VRF space
+ *
+ * Copyright (c) 2015 Cumulus Networks. All rights reserved.
+ * Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com>
+ * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
+ *
+ * Based on dummy, team and ipvlan drivers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ip.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/netfilter.h>
+#include <linux/rtnetlink.h>
+#include <net/rtnetlink.h>
+#include <linux/u64_stats_sync.h>
+#include <linux/hashtable.h>
+
+#include <linux/inetdevice.h>
+#include <net/arp.h>
+#include <net/ip.h>
+#include <net/ip_fib.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#include <net/rtnetlink.h>
+#include <net/route.h>
+#include <net/addrconf.h>
+#include <net/l3mdev.h>
+
+#define RT_FL_TOS(oldflp4) \
+	((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
+
+#define DRV_NAME	"vrf"
+#define DRV_VERSION	"1.0"
+
+#define vrf_master_get_rcu(dev) \
+	((struct net_device *)rcu_dereference(dev->rx_handler_data))
+
+struct slave {
+	struct list_head        list;
+	struct net_device       *dev;
+};
+
+struct slave_queue {
+	struct list_head        all_slaves;
+};
+
+struct net_vrf {
+	struct slave_queue      queue;
+	struct rtable           *rth;
+	struct rt6_info		*rt6;
+	u32                     tb_id;
+};
+
+struct pcpu_dstats {
+	u64			tx_pkts;
+	u64			tx_bytes;
+	u64			tx_drps;
+	u64			rx_pkts;
+	u64			rx_bytes;
+	struct u64_stats_sync	syncp;
+};
+
+static struct dst_entry *vrf_ip_check(struct dst_entry *dst, u32 cookie)
+{
+	return dst;
+}
+
+static int vrf_ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+	return ip_local_out(net, sk, skb);
+}
+
+static unsigned int vrf_v4_mtu(const struct dst_entry *dst)
+{
+	/* TO-DO: return max ethernet size? */
+	return dst->dev->mtu;
+}
+
+static void vrf_dst_destroy(struct dst_entry *dst)
+{
+	/* our dst lives forever - or until the device is closed */
+}
+
+static unsigned int vrf_default_advmss(const struct dst_entry *dst)
+{
+	return 65535 - 40;
+}
+
+static struct dst_ops vrf_dst_ops = {
+	.family		= AF_INET,
+	.local_out	= vrf_ip_local_out,
+	.check		= vrf_ip_check,
+	.mtu		= vrf_v4_mtu,
+	.destroy	= vrf_dst_destroy,
+	.default_advmss	= vrf_default_advmss,
+};
+
+/* neighbor handling is done with actual device; do not want
+ * to flip skb->dev for those ndisc packets. This really fails
+ * for multiple next protocols (e.g., NEXTHDR_HOP). But it is
+ * a start.
+ */
+#if IS_ENABLED(CONFIG_IPV6)
+static bool check_ipv6_frame(const struct sk_buff *skb)
+{
+	const struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb->data;
+	size_t hlen = sizeof(*ipv6h);
+	bool rc = true;
+
+	if (skb->len < hlen)
+		goto out;
+
+	if (ipv6h->nexthdr == NEXTHDR_ICMP) {
+		const struct icmp6hdr *icmph;
+
+		if (skb->len < hlen + sizeof(*icmph))
+			goto out;
+
+		icmph = (struct icmp6hdr *)(skb->data + sizeof(*ipv6h));
+		switch (icmph->icmp6_type) {
+		case NDISC_ROUTER_SOLICITATION:
+		case NDISC_ROUTER_ADVERTISEMENT:
+		case NDISC_NEIGHBOUR_SOLICITATION:
+		case NDISC_NEIGHBOUR_ADVERTISEMENT:
+		case NDISC_REDIRECT:
+			rc = false;
+			break;
+		}
+	}
+
+out:
+	return rc;
+}
+#else
+static bool check_ipv6_frame(const struct sk_buff *skb)
+{
+	return false;
+}
+#endif
+
+static bool is_ip_rx_frame(struct sk_buff *skb)
+{
+	switch (skb->protocol) {
+	case htons(ETH_P_IP):
+		return true;
+	case htons(ETH_P_IPV6):
+		return check_ipv6_frame(skb);
+	}
+	return false;
+}
+
+static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
+{
+	vrf_dev->stats.tx_errors++;
+	kfree_skb(skb);
+}
+
+/* note: already called with rcu_read_lock */
+static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb)
+{
+	struct sk_buff *skb = *pskb;
+
+	if (is_ip_rx_frame(skb)) {
+		struct net_device *dev = vrf_master_get_rcu(skb->dev);
+		struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
+
+		u64_stats_update_begin(&dstats->syncp);
+		dstats->rx_pkts++;
+		dstats->rx_bytes += skb->len;
+		u64_stats_update_end(&dstats->syncp);
+
+		skb->dev = dev;
+
+		return RX_HANDLER_ANOTHER;
+	}
+	return RX_HANDLER_PASS;
+}
+
+static struct rtnl_link_stats64 *vrf_get_stats64(struct net_device *dev,
+						 struct rtnl_link_stats64 *stats)
+{
+	int i;
+
+	for_each_possible_cpu(i) {
+		const struct pcpu_dstats *dstats;
+		u64 tbytes, tpkts, tdrops, rbytes, rpkts;
+		unsigned int start;
+
+		dstats = per_cpu_ptr(dev->dstats, i);
+		do {
+			start = u64_stats_fetch_begin_irq(&dstats->syncp);
+			tbytes = dstats->tx_bytes;
+			tpkts = dstats->tx_pkts;
+			tdrops = dstats->tx_drps;
+			rbytes = dstats->rx_bytes;
+			rpkts = dstats->rx_pkts;
+		} while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
+		stats->tx_bytes += tbytes;
+		stats->tx_packets += tpkts;
+		stats->tx_dropped += tdrops;
+		stats->rx_bytes += rbytes;
+		stats->rx_packets += rpkts;
+	}
+	return stats;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
+					   struct net_device *dev)
+{
+	const struct ipv6hdr *iph = ipv6_hdr(skb);
+	struct net *net = dev_net(skb->dev);
+	struct flowi6 fl6 = {
+		/* needed to match OIF rule */
+		.flowi6_oif = dev->ifindex,
+		.flowi6_iif = LOOPBACK_IFINDEX,
+		.daddr = iph->daddr,
+		.saddr = iph->saddr,
+		.flowlabel = ip6_flowinfo(iph),
+		.flowi6_mark = skb->mark,
+		.flowi6_proto = iph->nexthdr,
+		.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF,
+	};
+	int ret = NET_XMIT_DROP;
+	struct dst_entry *dst;
+	struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
+
+	dst = ip6_route_output(net, NULL, &fl6);
+	if (dst == dst_null)
+		goto err;
+
+	skb_dst_drop(skb);
+	skb_dst_set(skb, dst);
+
+	ret = ip6_local_out(net, skb->sk, skb);
+	if (unlikely(net_xmit_eval(ret)))
+		dev->stats.tx_errors++;
+	else
+		ret = NET_XMIT_SUCCESS;
+
+	return ret;
+err:
+	vrf_tx_error(dev, skb);
+	return NET_XMIT_DROP;
+}
+#else
+static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
+					   struct net_device *dev)
+{
+	vrf_tx_error(dev, skb);
+	return NET_XMIT_DROP;
+}
+#endif
+
+static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4,
+			    struct net_device *vrf_dev)
+{
+	struct rtable *rt;
+	int err = 1;
+
+	rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL);
+	if (IS_ERR(rt))
+		goto out;
+
+	/* TO-DO: what about broadcast ? */
+	if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
+		ip_rt_put(rt);
+		goto out;
+	}
+
+	skb_dst_drop(skb);
+	skb_dst_set(skb, &rt->dst);
+	err = 0;
+out:
+	return err;
+}
+
+static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
+					   struct net_device *vrf_dev)
+{
+	struct iphdr *ip4h = ip_hdr(skb);
+	int ret = NET_XMIT_DROP;
+	struct flowi4 fl4 = {
+		/* needed to match OIF rule */
+		.flowi4_oif = vrf_dev->ifindex,
+		.flowi4_iif = LOOPBACK_IFINDEX,
+		.flowi4_tos = RT_TOS(ip4h->tos),
+		.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC |
+				FLOWI_FLAG_SKIP_NH_OIF,
+		.daddr = ip4h->daddr,
+	};
+
+	if (vrf_send_v4_prep(skb, &fl4, vrf_dev))
+		goto err;
+
+	if (!ip4h->saddr) {
+		ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
+					       RT_SCOPE_LINK);
+	}
+
+	ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
+	if (unlikely(net_xmit_eval(ret)))
+		vrf_dev->stats.tx_errors++;
+	else
+		ret = NET_XMIT_SUCCESS;
+
+out:
+	return ret;
+err:
+	vrf_tx_error(vrf_dev, skb);
+	goto out;
+}
+
+static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
+{
+	/* strip the ethernet header added for pass through VRF device */
+	__skb_pull(skb, skb_network_offset(skb));
+
+	switch (skb->protocol) {
+	case htons(ETH_P_IP):
+		return vrf_process_v4_outbound(skb, dev);
+	case htons(ETH_P_IPV6):
+		return vrf_process_v6_outbound(skb, dev);
+	default:
+		vrf_tx_error(dev, skb);
+		return NET_XMIT_DROP;
+	}
+}
+
+static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	netdev_tx_t ret = is_ip_tx_frame(skb, dev);
+
+	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
+		struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
+
+		u64_stats_update_begin(&dstats->syncp);
+		dstats->tx_pkts++;
+		dstats->tx_bytes += skb->len;
+		u64_stats_update_end(&dstats->syncp);
+	} else {
+		this_cpu_inc(dev->dstats->tx_drps);
+	}
+
+	return ret;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct dst_entry *vrf_ip6_check(struct dst_entry *dst, u32 cookie)
+{
+	return dst;
+}
+
+static struct dst_ops vrf_dst_ops6 = {
+	.family		= AF_INET6,
+	.local_out	= ip6_local_out,
+	.check		= vrf_ip6_check,
+	.mtu		= vrf_v4_mtu,
+	.destroy	= vrf_dst_destroy,
+	.default_advmss	= vrf_default_advmss,
+};
+
+static int init_dst_ops6_kmem_cachep(void)
+{
+	vrf_dst_ops6.kmem_cachep = kmem_cache_create("vrf_ip6_dst_cache",
+						     sizeof(struct rt6_info),
+						     0,
+						     SLAB_HWCACHE_ALIGN,
+						     NULL);
+
+	if (!vrf_dst_ops6.kmem_cachep)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void free_dst_ops6_kmem_cachep(void)
+{
+	kmem_cache_destroy(vrf_dst_ops6.kmem_cachep);
+}
+
+static int vrf_input6(struct sk_buff *skb)
+{
+	skb->dev->stats.rx_errors++;
+	kfree_skb(skb);
+	return 0;
+}
+
+/* modelled after ip6_finish_output2 */
+static int vrf_finish_output6(struct net *net, struct sock *sk,
+			      struct sk_buff *skb)
+{
+	struct dst_entry *dst = skb_dst(skb);
+	struct net_device *dev = dst->dev;
+	struct neighbour *neigh;
+	struct in6_addr *nexthop;
+	int ret;
+
+	skb->protocol = htons(ETH_P_IPV6);
+	skb->dev = dev;
+
+	rcu_read_lock_bh();
+	nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
+	neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
+	if (unlikely(!neigh))
+		neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
+	if (!IS_ERR(neigh)) {
+		ret = dst_neigh_output(dst, neigh, skb);
+		rcu_read_unlock_bh();
+		return ret;
+	}
+	rcu_read_unlock_bh();
+
+	IP6_INC_STATS(dev_net(dst->dev),
+		      ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
+	kfree_skb(skb);
+	return -EINVAL;
+}
+
+/* modelled after ip6_output */
+static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+	return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
+			    net, sk, skb, NULL, skb_dst(skb)->dev,
+			    vrf_finish_output6,
+			    !(IP6CB(skb)->flags & IP6SKB_REROUTED));
+}
+
+static void vrf_rt6_destroy(struct net_vrf *vrf)
+{
+	dst_destroy(&vrf->rt6->dst);
+	free_percpu(vrf->rt6->rt6i_pcpu);
+	vrf->rt6 = NULL;
+}
+
+static int vrf_rt6_create(struct net_device *dev)
+{
+	struct net_vrf *vrf = netdev_priv(dev);
+	struct dst_entry *dst;
+	struct rt6_info *rt6;
+	int cpu;
+	int rc = -ENOMEM;
+
+	rt6 = dst_alloc(&vrf_dst_ops6, dev, 0,
+			DST_OBSOLETE_NONE,
+			(DST_HOST | DST_NOPOLICY | DST_NOXFRM));
+	if (!rt6)
+		goto out;
+
+	dst = &rt6->dst;
+
+	rt6->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_KERNEL);
+	if (!rt6->rt6i_pcpu) {
+		dst_destroy(dst);
+		goto out;
+	}
+	for_each_possible_cpu(cpu) {
+		struct rt6_info **p = per_cpu_ptr(rt6->rt6i_pcpu, cpu);
+		*p =  NULL;
+	}
+
+	memset(dst + 1, 0, sizeof(*rt6) - sizeof(*dst));
+
+	INIT_LIST_HEAD(&rt6->rt6i_siblings);
+	INIT_LIST_HEAD(&rt6->rt6i_uncached);
+
+	rt6->dst.input	= vrf_input6;
+	rt6->dst.output	= vrf_output6;
+
+	rt6->rt6i_table = fib6_get_table(dev_net(dev), vrf->tb_id);
+
+	atomic_set(&rt6->dst.__refcnt, 2);
+
+	vrf->rt6 = rt6;
+	rc = 0;
+out:
+	return rc;
+}
+#else
+static int init_dst_ops6_kmem_cachep(void)
+{
+	return 0;
+}
+
+static void free_dst_ops6_kmem_cachep(void)
+{
+}
+
+static void vrf_rt6_destroy(struct net_vrf *vrf)
+{
+}
+
+static int vrf_rt6_create(struct net_device *dev)
+{
+	return 0;
+}
+#endif
+
+/* modelled after ip_finish_output2 */
+static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+	struct dst_entry *dst = skb_dst(skb);
+	struct rtable *rt = (struct rtable *)dst;
+	struct net_device *dev = dst->dev;
+	unsigned int hh_len = LL_RESERVED_SPACE(dev);
+	struct neighbour *neigh;
+	u32 nexthop;
+	int ret = -EINVAL;
+
+	/* Be paranoid, rather than too clever. */
+	if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
+		struct sk_buff *skb2;
+
+		skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
+		if (!skb2) {
+			ret = -ENOMEM;
+			goto err;
+		}
+		if (skb->sk)
+			skb_set_owner_w(skb2, skb->sk);
+
+		consume_skb(skb);
+		skb = skb2;
+	}
+
+	rcu_read_lock_bh();
+
+	nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
+	neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
+	if (unlikely(!neigh))
+		neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
+	if (!IS_ERR(neigh))
+		ret = dst_neigh_output(dst, neigh, skb);
+
+	rcu_read_unlock_bh();
+err:
+	if (unlikely(ret < 0))
+		vrf_tx_error(skb->dev, skb);
+	return ret;
+}
+
+static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+	struct net_device *dev = skb_dst(skb)->dev;
+
+	IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
+
+	skb->dev = dev;
+	skb->protocol = htons(ETH_P_IP);
+
+	return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
+			    net, sk, skb, NULL, dev,
+			    vrf_finish_output,
+			    !(IPCB(skb)->flags & IPSKB_REROUTED));
+}
+
+static void vrf_rtable_destroy(struct net_vrf *vrf)
+{
+	struct dst_entry *dst = (struct dst_entry *)vrf->rth;
+
+	dst_destroy(dst);
+	vrf->rth = NULL;
+}
+
+static struct rtable *vrf_rtable_create(struct net_device *dev)
+{
+	struct net_vrf *vrf = netdev_priv(dev);
+	struct rtable *rth;
+
+	rth = dst_alloc(&vrf_dst_ops, dev, 2,
+			DST_OBSOLETE_NONE,
+			(DST_HOST | DST_NOPOLICY | DST_NOXFRM));
+	if (rth) {
+		rth->dst.output	= vrf_output;
+		rth->rt_genid	= rt_genid_ipv4(dev_net(dev));
+		rth->rt_flags	= 0;
+		rth->rt_type	= RTN_UNICAST;
+		rth->rt_is_input = 0;
+		rth->rt_iif	= 0;
+		rth->rt_pmtu	= 0;
+		rth->rt_gateway	= 0;
+		rth->rt_uses_gateway = 0;
+		rth->rt_table_id = vrf->tb_id;
+		INIT_LIST_HEAD(&rth->rt_uncached);
+		rth->rt_uncached_list = NULL;
+	}
+
+	return rth;
+}
+
+/**************************** device handling ********************/
+
+/* cycle interface to flush neighbor cache and move routes across tables */
+static void cycle_netdev(struct net_device *dev)
+{
+	unsigned int flags = dev->flags;
+	int ret;
+
+	if (!netif_running(dev))
+		return;
+
+	ret = dev_change_flags(dev, flags & ~IFF_UP);
+	if (ret >= 0)
+		ret = dev_change_flags(dev, flags);
+
+	if (ret < 0) {
+		netdev_err(dev,
+			   "Failed to cycle device %s; route tables might be wrong!\n",
+			   dev->name);
+	}
+}
+
+static struct slave *__vrf_find_slave_dev(struct slave_queue *queue,
+					  struct net_device *dev)
+{
+	struct list_head *head = &queue->all_slaves;
+	struct slave *slave;
+
+	list_for_each_entry(slave, head, list) {
+		if (slave->dev == dev)
+			return slave;
+	}
+
+	return NULL;
+}
+
+/* inverse of __vrf_insert_slave */
+static void __vrf_remove_slave(struct slave_queue *queue, struct slave *slave)
+{
+	list_del(&slave->list);
+}
+
+static void __vrf_insert_slave(struct slave_queue *queue, struct slave *slave)
+{
+	list_add(&slave->list, &queue->all_slaves);
+}
+
+static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
+{
+	struct slave *slave = kzalloc(sizeof(*slave), GFP_KERNEL);
+	struct net_vrf *vrf = netdev_priv(dev);
+	struct slave_queue *queue = &vrf->queue;
+	int ret = -ENOMEM;
+
+	if (!slave)
+		goto out_fail;
+
+	slave->dev = port_dev;
+
+	/* register the packet handler for slave ports */
+	ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev);
+	if (ret) {
+		netdev_err(port_dev,
+			   "Device %s failed to register rx_handler\n",
+			   port_dev->name);
+		goto out_fail;
+	}
+
+	ret = netdev_master_upper_dev_link(port_dev, dev);
+	if (ret < 0)
+		goto out_unregister;
+
+	port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
+	__vrf_insert_slave(queue, slave);
+	cycle_netdev(port_dev);
+
+	return 0;
+
+out_unregister:
+	netdev_rx_handler_unregister(port_dev);
+out_fail:
+	kfree(slave);
+	return ret;
+}
+
+static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
+{
+	if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev))
+		return -EINVAL;
+
+	return do_vrf_add_slave(dev, port_dev);
+}
+
+/* inverse of do_vrf_add_slave */
+static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
+{
+	struct net_vrf *vrf = netdev_priv(dev);
+	struct slave_queue *queue = &vrf->queue;
+	struct slave *slave;
+
+	netdev_upper_dev_unlink(port_dev, dev);
+	port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
+
+	netdev_rx_handler_unregister(port_dev);
+
+	cycle_netdev(port_dev);
+
+	slave = __vrf_find_slave_dev(queue, port_dev);
+	if (slave)
+		__vrf_remove_slave(queue, slave);
+
+	kfree(slave);
+
+	return 0;
+}
+
+static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
+{
+	return do_vrf_del_slave(dev, port_dev);
+}
+
+static void vrf_dev_uninit(struct net_device *dev)
+{
+	struct net_vrf *vrf = netdev_priv(dev);
+	struct slave_queue *queue = &vrf->queue;
+	struct list_head *head = &queue->all_slaves;
+	struct slave *slave, *next;
+
+	vrf_rtable_destroy(vrf);
+	vrf_rt6_destroy(vrf);
+
+	list_for_each_entry_safe(slave, next, head, list)
+		vrf_del_slave(dev, slave->dev);
+
+	free_percpu(dev->dstats);
+	dev->dstats = NULL;
+}
+
+static int vrf_dev_init(struct net_device *dev)
+{
+	struct net_vrf *vrf = netdev_priv(dev);
+
+	INIT_LIST_HEAD(&vrf->queue.all_slaves);
+
+	dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
+	if (!dev->dstats)
+		goto out_nomem;
+
+	/* create the default dst which points back to us */
+	vrf->rth = vrf_rtable_create(dev);
+	if (!vrf->rth)
+		goto out_stats;
+
+	if (vrf_rt6_create(dev) != 0)
+		goto out_rth;
+
+	dev->flags = IFF_MASTER | IFF_NOARP;
+
+	return 0;
+
+out_rth:
+	vrf_rtable_destroy(vrf);
+out_stats:
+	free_percpu(dev->dstats);
+	dev->dstats = NULL;
+out_nomem:
+	return -ENOMEM;
+}
+
+static const struct net_device_ops vrf_netdev_ops = {
+	.ndo_init		= vrf_dev_init,
+	.ndo_uninit		= vrf_dev_uninit,
+	.ndo_start_xmit		= vrf_xmit,
+	.ndo_get_stats64	= vrf_get_stats64,
+	.ndo_add_slave		= vrf_add_slave,
+	.ndo_del_slave		= vrf_del_slave,
+};
+
+static u32 vrf_fib_table(const struct net_device *dev)
+{
+	struct net_vrf *vrf = netdev_priv(dev);
+
+	return vrf->tb_id;
+}
+
+static struct rtable *vrf_get_rtable(const struct net_device *dev,
+				     const struct flowi4 *fl4)
+{
+	struct rtable *rth = NULL;
+
+	if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) {
+		struct net_vrf *vrf = netdev_priv(dev);
+
+		rth = vrf->rth;
+		atomic_inc(&rth->dst.__refcnt);
+	}
+
+	return rth;
+}
+
+/* called under rcu_read_lock */
+static int vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4)
+{
+	struct fib_result res = { .tclassid = 0 };
+	struct net *net = dev_net(dev);
+	u32 orig_tos = fl4->flowi4_tos;
+	u8 flags = fl4->flowi4_flags;
+	u8 scope = fl4->flowi4_scope;
+	u8 tos = RT_FL_TOS(fl4);
+	int rc;
+
+	if (unlikely(!fl4->daddr))
+		return 0;
+
+	fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF;
+	fl4->flowi4_iif = LOOPBACK_IFINDEX;
+	fl4->flowi4_tos = tos & IPTOS_RT_MASK;
+	fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
+			     RT_SCOPE_LINK : RT_SCOPE_UNIVERSE);
+
+	rc = fib_lookup(net, fl4, &res, 0);
+	if (!rc) {
+		if (res.type == RTN_LOCAL)
+			fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr;
+		else
+			fib_select_path(net, &res, fl4, -1);
+	}
+
+	fl4->flowi4_flags = flags;
+	fl4->flowi4_tos = orig_tos;
+	fl4->flowi4_scope = scope;
+
+	return rc;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev,
+					 const struct flowi6 *fl6)
+{
+	struct rt6_info *rt = NULL;
+
+	if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) {
+		struct net_vrf *vrf = netdev_priv(dev);
+
+		rt = vrf->rt6;
+		atomic_inc(&rt->dst.__refcnt);
+	}
+
+	return (struct dst_entry *)rt;
+}
+#endif
+
+static const struct l3mdev_ops vrf_l3mdev_ops = {
+	.l3mdev_fib_table	= vrf_fib_table,
+	.l3mdev_get_rtable	= vrf_get_rtable,
+	.l3mdev_get_saddr	= vrf_get_saddr,
+#if IS_ENABLED(CONFIG_IPV6)
+	.l3mdev_get_rt6_dst	= vrf_get_rt6_dst,
+#endif
+};
+
+static void vrf_get_drvinfo(struct net_device *dev,
+			    struct ethtool_drvinfo *info)
+{
+	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
+	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
+}
+
+static const struct ethtool_ops vrf_ethtool_ops = {
+	.get_drvinfo	= vrf_get_drvinfo,
+};
+
+static void vrf_setup(struct net_device *dev)
+{
+	ether_setup(dev);
+
+	/* Initialize the device structure. */
+	dev->netdev_ops = &vrf_netdev_ops;
+	dev->l3mdev_ops = &vrf_l3mdev_ops;
+	dev->ethtool_ops = &vrf_ethtool_ops;
+	dev->destructor = free_netdev;
+
+	/* Fill in device structure with ethernet-generic values. */
+	eth_hw_addr_random(dev);
+
+	/* don't acquire vrf device's netif_tx_lock when transmitting */
+	dev->features |= NETIF_F_LLTX;
+
+	/* don't allow vrf devices to change network namespaces. */
+	dev->features |= NETIF_F_NETNS_LOCAL;
+}
+
+static int vrf_validate(struct nlattr *tb[], struct nlattr *data[])
+{
+	if (tb[IFLA_ADDRESS]) {
+		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
+			return -EINVAL;
+		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
+			return -EADDRNOTAVAIL;
+	}
+	return 0;
+}
+
+static void vrf_dellink(struct net_device *dev, struct list_head *head)
+{
+	unregister_netdevice_queue(dev, head);
+}
+
+static int vrf_newlink(struct net *src_net, struct net_device *dev,
+		       struct nlattr *tb[], struct nlattr *data[])
+{
+	struct net_vrf *vrf = netdev_priv(dev);
+
+	if (!data || !data[IFLA_VRF_TABLE])
+		return -EINVAL;
+
+	vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
+
+	dev->priv_flags |= IFF_L3MDEV_MASTER;
+
+	return register_netdevice(dev);
+}
+
+static size_t vrf_nl_getsize(const struct net_device *dev)
+{
+	return nla_total_size(sizeof(u32));  /* IFLA_VRF_TABLE */
+}
+
+static int vrf_fillinfo(struct sk_buff *skb,
+			const struct net_device *dev)
+{
+	struct net_vrf *vrf = netdev_priv(dev);
+
+	return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
+}
+
+static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
+	[IFLA_VRF_TABLE] = { .type = NLA_U32 },
+};
+
+static struct rtnl_link_ops vrf_link_ops __read_mostly = {
+	.kind		= DRV_NAME,
+	.priv_size	= sizeof(struct net_vrf),
+
+	.get_size	= vrf_nl_getsize,
+	.policy		= vrf_nl_policy,
+	.validate	= vrf_validate,
+	.fill_info	= vrf_fillinfo,
+
+	.newlink	= vrf_newlink,
+	.dellink	= vrf_dellink,
+	.setup		= vrf_setup,
+	.maxtype	= IFLA_VRF_MAX,
+};
+
+static int vrf_device_event(struct notifier_block *unused,
+			    unsigned long event, void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+	/* only care about unregister events to drop slave references */
+	if (event == NETDEV_UNREGISTER) {
+		struct net_device *vrf_dev;
+
+		if (!netif_is_l3_slave(dev))
+			goto out;
+
+		vrf_dev = netdev_master_upper_dev_get(dev);
+		vrf_del_slave(vrf_dev, dev);
+	}
+out:
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block vrf_notifier_block __read_mostly = {
+	.notifier_call = vrf_device_event,
+};
+
+static int __init vrf_init_module(void)
+{
+	int rc;
+
+	vrf_dst_ops.kmem_cachep =
+		kmem_cache_create("vrf_ip_dst_cache",
+				  sizeof(struct rtable), 0,
+				  SLAB_HWCACHE_ALIGN,
+				  NULL);
+
+	if (!vrf_dst_ops.kmem_cachep)
+		return -ENOMEM;
+
+	rc = init_dst_ops6_kmem_cachep();
+	if (rc != 0)
+		goto error2;
+
+	register_netdevice_notifier(&vrf_notifier_block);
+
+	rc = rtnl_link_register(&vrf_link_ops);
+	if (rc < 0)
+		goto error;
+
+	return 0;
+
+error:
+	unregister_netdevice_notifier(&vrf_notifier_block);
+	free_dst_ops6_kmem_cachep();
+error2:
+	kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
+	return rc;
+}
+
+static void __exit vrf_cleanup_module(void)
+{
+	rtnl_link_unregister(&vrf_link_ops);
+	unregister_netdevice_notifier(&vrf_notifier_block);
+	kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
+	free_dst_ops6_kmem_cachep();
+}
+
+module_init(vrf_init_module);
+module_exit(vrf_cleanup_module);
+MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
+MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_RTNL_LINK(DRV_NAME);
+MODULE_VERSION(DRV_VERSION);