vrf.c 33.3 KB
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/*
 * 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>
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#include <net/arp.h>
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#include <net/ip.h>
#include <net/ip_fib.h>
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#include <net/ip6_fib.h>
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#include <net/ip6_route.h>
#include <net/route.h>
#include <net/addrconf.h>
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#include <net/l3mdev.h>
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#include <net/fib_rules.h>
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#include <net/netns/generic.h>
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#define DRV_NAME	"vrf"
#define DRV_VERSION	"1.0"

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#define FIB_RULE_PREF  1000       /* default preference for FIB rules */
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static unsigned int vrf_net_id;
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struct net_vrf {
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	struct rtable __rcu	*rth;
	struct rt6_info	__rcu	*rt6;
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#if IS_ENABLED(CONFIG_IPV6)
	struct fib6_table	*fib6_table;
#endif
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	u32                     tb_id;
};

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struct pcpu_dstats {
	u64			tx_pkts;
	u64			tx_bytes;
	u64			tx_drps;
	u64			rx_pkts;
	u64			rx_bytes;
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	u64			rx_drps;
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	struct u64_stats_sync	syncp;
};

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static void vrf_rx_stats(struct net_device *dev, int len)
{
	struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);

	u64_stats_update_begin(&dstats->syncp);
	dstats->rx_pkts++;
	dstats->rx_bytes += len;
	u64_stats_update_end(&dstats->syncp);
}

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static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
{
	vrf_dev->stats.tx_errors++;
	kfree_skb(skb);
}

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static void vrf_get_stats64(struct net_device *dev,
			    struct rtnl_link_stats64 *stats)
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{
	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;
	}
}

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/* by default VRF devices do not have a qdisc and are expected
 * to be created with only a single queue.
 */
static bool qdisc_tx_is_default(const struct net_device *dev)
{
	struct netdev_queue *txq;
	struct Qdisc *qdisc;

	if (dev->num_tx_queues > 1)
		return false;

	txq = netdev_get_tx_queue(dev, 0);
	qdisc = rcu_access_pointer(txq->qdisc);

	return !qdisc->enqueue;
}

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/* Local traffic destined to local address. Reinsert the packet to rx
 * path, similar to loopback handling.
 */
static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
			  struct dst_entry *dst)
{
	int len = skb->len;

	skb_orphan(skb);

	skb_dst_set(skb, dst);

	/* set pkt_type to avoid skb hitting packet taps twice -
	 * once on Tx and again in Rx processing
	 */
	skb->pkt_type = PACKET_LOOPBACK;

	skb->protocol = eth_type_trans(skb, dev);

	if (likely(netif_rx(skb) == NET_RX_SUCCESS))
		vrf_rx_stats(dev, len);
	else
		this_cpu_inc(dev->dstats->rx_drps);

	return NETDEV_TX_OK;
}

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#if IS_ENABLED(CONFIG_IPV6)
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static int vrf_ip6_local_out(struct net *net, struct sock *sk,
			     struct sk_buff *skb)
{
	int err;

	err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
		      sk, skb, NULL, skb_dst(skb)->dev, dst_output);

	if (likely(err == 1))
		err = dst_output(net, sk, skb);

	return err;
}

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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,
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		.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF,
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	};
	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);
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	/* if dst.dev is loopback or the VRF device again this is locally
	 * originated traffic destined to a local address. Short circuit
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	 * to Rx path
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	 */
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	if (dst->dev == dev)
		return vrf_local_xmit(skb, dev, dst);
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	skb_dst_set(skb, dst);

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	/* strip the ethernet header added for pass through VRF device */
	__skb_pull(skb, skb_network_offset(skb));

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	ret = vrf_ip6_local_out(net, skb->sk, skb);
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	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
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static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
					   struct net_device *dev)
{
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	vrf_tx_error(dev, skb);
	return NET_XMIT_DROP;
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}
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#endif
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/* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
static int vrf_ip_local_out(struct net *net, struct sock *sk,
			    struct sk_buff *skb)
{
	int err;

	err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
		      skb, NULL, skb_dst(skb)->dev, dst_output);
	if (likely(err == 1))
		err = dst_output(net, sk, skb);

	return err;
}

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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),
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		.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF,
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		.flowi4_proto = ip4h->protocol,
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		.daddr = ip4h->daddr,
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		.saddr = ip4h->saddr,
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	};
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	struct net *net = dev_net(vrf_dev);
	struct rtable *rt;

	rt = ip_route_output_flow(net, &fl4, NULL);
	if (IS_ERR(rt))
		goto err;
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	skb_dst_drop(skb);
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	/* if dst.dev is loopback or the VRF device again this is locally
	 * originated traffic destined to a local address. Short circuit
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	 * to Rx path
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	 */
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	if (rt->dst.dev == vrf_dev)
		return vrf_local_xmit(skb, vrf_dev, &rt->dst);
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	skb_dst_set(skb, &rt->dst);

	/* strip the ethernet header added for pass through VRF device */
	__skb_pull(skb, skb_network_offset(skb));
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	if (!ip4h->saddr) {
		ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
					       RT_SCOPE_LINK);
	}

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	ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
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	if (unlikely(net_xmit_eval(ret)))
		vrf_dev->stats.tx_errors++;
	else
		ret = NET_XMIT_SUCCESS;

out:
	return ret;
err:
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	vrf_tx_error(vrf_dev, skb);
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	goto out;
}

static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
{
	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:
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		vrf_tx_error(dev, skb);
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		return NET_XMIT_DROP;
	}
}

static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
{
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	int len = skb->len;
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	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++;
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		dstats->tx_bytes += len;
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		u64_stats_update_end(&dstats->syncp);
	} else {
		this_cpu_inc(dev->dstats->tx_drps);
	}

	return ret;
}

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static int vrf_finish_direct(struct net *net, struct sock *sk,
			     struct sk_buff *skb)
{
	struct net_device *vrf_dev = skb->dev;

	if (!list_empty(&vrf_dev->ptype_all) &&
	    likely(skb_headroom(skb) >= ETH_HLEN)) {
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		struct ethhdr *eth = skb_push(skb, ETH_HLEN);
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		ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
		eth_zero_addr(eth->h_dest);
		eth->h_proto = skb->protocol;

		rcu_read_lock_bh();
		dev_queue_xmit_nit(skb, vrf_dev);
		rcu_read_unlock_bh();

		skb_pull(skb, ETH_HLEN);
	}

	return 1;
}

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#if IS_ENABLED(CONFIG_IPV6)
/* 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;

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	nf_reset(skb);

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	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)) {
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		sock_confirm_neigh(skb, neigh);
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		ret = neigh_output(neigh, skb);
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		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));
}

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/* set dst on skb to send packet to us via dev_xmit path. Allows
 * packet to go through device based features such as qdisc, netfilter
 * hooks and packet sockets with skb->dev set to vrf device.
 */
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static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev,
					    struct sk_buff *skb)
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{
	struct net_vrf *vrf = netdev_priv(vrf_dev);
	struct dst_entry *dst = NULL;
	struct rt6_info *rt6;

	rcu_read_lock();

	rt6 = rcu_dereference(vrf->rt6);
	if (likely(rt6)) {
		dst = &rt6->dst;
		dst_hold(dst);
	}

	rcu_read_unlock();

	if (unlikely(!dst)) {
		vrf_tx_error(vrf_dev, skb);
		return NULL;
	}

	skb_dst_drop(skb);
	skb_dst_set(skb, dst);

	return skb;
}

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static int vrf_output6_direct(struct net *net, struct sock *sk,
			      struct sk_buff *skb)
{
	skb->protocol = htons(ETH_P_IPV6);

	return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
			    net, sk, skb, NULL, skb->dev,
			    vrf_finish_direct,
			    !(IPCB(skb)->flags & IPSKB_REROUTED));
}

static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev,
					  struct sock *sk,
					  struct sk_buff *skb)
{
	struct net *net = dev_net(vrf_dev);
	int err;

	skb->dev = vrf_dev;

	err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk,
		      skb, NULL, vrf_dev, vrf_output6_direct);

	if (likely(err == 1))
		err = vrf_output6_direct(net, sk, skb);

	/* reset skb device */
	if (likely(err == 1))
		nf_reset(skb);
	else
		skb = NULL;

	return skb;
}

static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
				   struct sock *sk,
				   struct sk_buff *skb)
{
	/* don't divert link scope packets */
	if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
		return skb;

	if (qdisc_tx_is_default(vrf_dev))
		return vrf_ip6_out_direct(vrf_dev, sk, skb);

	return vrf_ip6_out_redirect(vrf_dev, skb);
}

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/* holding rtnl */
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static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
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{
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	struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
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	struct net *net = dev_net(dev);
	struct dst_entry *dst;
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	RCU_INIT_POINTER(vrf->rt6, NULL);
	synchronize_rcu();
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	/* move dev in dst's to loopback so this VRF device can be deleted
	 * - based on dst_ifdown
	 */
	if (rt6) {
		dst = &rt6->dst;
		dev_put(dst->dev);
		dst->dev = net->loopback_dev;
		dev_hold(dst->dev);
		dst_release(dst);
	}
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}

static int vrf_rt6_create(struct net_device *dev)
{
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	int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM;
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	struct net_vrf *vrf = netdev_priv(dev);
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	struct net *net = dev_net(dev);
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	struct rt6_info *rt6;
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	int rc = -ENOMEM;

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	/* IPv6 can be CONFIG enabled and then disabled runtime */
	if (!ipv6_mod_enabled())
		return 0;

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	vrf->fib6_table = fib6_new_table(net, vrf->tb_id);
	if (!vrf->fib6_table)
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		goto out;

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	/* create a dst for routing packets out a VRF device */
	rt6 = ip6_dst_alloc(net, dev, flags);
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	if (!rt6)
		goto out;

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	rt6->dst.output	= vrf_output6;
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	rcu_assign_pointer(vrf->rt6, rt6);

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	rc = 0;
out:
	return rc;
}
#else
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static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
				   struct sock *sk,
				   struct sk_buff *skb)
{
	return skb;
}

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static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
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{
}

static int vrf_rt6_create(struct net_device *dev)
{
	return 0;
}
#endif

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/* modelled after ip_finish_output2 */
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static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
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{
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	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;

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	nf_reset(skb);

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	/* 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);
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	if (!IS_ERR(neigh)) {
		sock_confirm_neigh(skb, neigh);
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		ret = neigh_output(neigh, skb);
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		rcu_read_unlock_bh();
		return ret;
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	}
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	rcu_read_unlock_bh();
err:
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	vrf_tx_error(skb->dev, skb);
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	return ret;
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}

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static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
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{
	struct net_device *dev = skb_dst(skb)->dev;

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	IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
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	skb->dev = dev;
	skb->protocol = htons(ETH_P_IP);

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	return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
			    net, sk, skb, NULL, dev,
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			    vrf_finish_output,
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			    !(IPCB(skb)->flags & IPSKB_REROUTED));
}

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/* set dst on skb to send packet to us via dev_xmit path. Allows
 * packet to go through device based features such as qdisc, netfilter
 * hooks and packet sockets with skb->dev set to vrf device.
 */
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static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev,
					   struct sk_buff *skb)
613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638
{
	struct net_vrf *vrf = netdev_priv(vrf_dev);
	struct dst_entry *dst = NULL;
	struct rtable *rth;

	rcu_read_lock();

	rth = rcu_dereference(vrf->rth);
	if (likely(rth)) {
		dst = &rth->dst;
		dst_hold(dst);
	}

	rcu_read_unlock();

	if (unlikely(!dst)) {
		vrf_tx_error(vrf_dev, skb);
		return NULL;
	}

	skb_dst_drop(skb);
	skb_dst_set(skb, dst);

	return skb;
}

639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677
static int vrf_output_direct(struct net *net, struct sock *sk,
			     struct sk_buff *skb)
{
	skb->protocol = htons(ETH_P_IP);

	return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
			    net, sk, skb, NULL, skb->dev,
			    vrf_finish_direct,
			    !(IPCB(skb)->flags & IPSKB_REROUTED));
}

static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
					 struct sock *sk,
					 struct sk_buff *skb)
{
	struct net *net = dev_net(vrf_dev);
	int err;

	skb->dev = vrf_dev;

	err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
		      skb, NULL, vrf_dev, vrf_output_direct);

	if (likely(err == 1))
		err = vrf_output_direct(net, sk, skb);

	/* reset skb device */
	if (likely(err == 1))
		nf_reset(skb);
	else
		skb = NULL;

	return skb;
}

static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
				  struct sock *sk,
				  struct sk_buff *skb)
{
678 679 680
	/* don't divert multicast or local broadcast */
	if (ipv4_is_multicast(ip_hdr(skb)->daddr) ||
	    ipv4_is_lbcast(ip_hdr(skb)->daddr))
681 682 683 684 685 686 687 688
		return skb;

	if (qdisc_tx_is_default(vrf_dev))
		return vrf_ip_out_direct(vrf_dev, sk, skb);

	return vrf_ip_out_redirect(vrf_dev, skb);
}

689 690 691 692 693 694 695 696 697
/* called with rcu lock held */
static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
				  struct sock *sk,
				  struct sk_buff *skb,
				  u16 proto)
{
	switch (proto) {
	case AF_INET:
		return vrf_ip_out(vrf_dev, sk, skb);
698 699
	case AF_INET6:
		return vrf_ip6_out(vrf_dev, sk, skb);
700 701 702 703 704
	}

	return skb;
}

705
/* holding rtnl */
706
static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
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{
708
	struct rtable *rth = rtnl_dereference(vrf->rth);
709 710
	struct net *net = dev_net(dev);
	struct dst_entry *dst;
711

712 713
	RCU_INIT_POINTER(vrf->rth, NULL);
	synchronize_rcu();
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714

715 716 717 718 719 720 721 722 723 724
	/* move dev in dst's to loopback so this VRF device can be deleted
	 * - based on dst_ifdown
	 */
	if (rth) {
		dst = &rth->dst;
		dev_put(dst->dev);
		dst->dev = net->loopback_dev;
		dev_hold(dst->dev);
		dst_release(dst);
	}
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725 726
}

727
static int vrf_rtable_create(struct net_device *dev)
D
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728
{
D
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729
	struct net_vrf *vrf = netdev_priv(dev);
730
	struct rtable *rth;
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731

732
	if (!fib_new_table(dev_net(dev), vrf->tb_id))
733
		return -ENOMEM;
734

735
	/* create a dst for routing packets out through a VRF device */
736
	rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1, 0);
737 738
	if (!rth)
		return -ENOMEM;
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739

740 741 742 743 744
	rth->dst.output	= vrf_output;

	rcu_assign_pointer(vrf->rth, rth);

	return 0;
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745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768
}

/**************************** 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);
	}
}

769 770
static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
			    struct netlink_ext_ack *extack)
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{
772
	int ret;
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774 775 776
	/* do not allow loopback device to be enslaved to a VRF.
	 * The vrf device acts as the loopback for the vrf.
	 */
777 778 779
	if (port_dev == dev_net(dev)->loopback_dev) {
		NL_SET_ERR_MSG(extack,
			       "Can not enslave loopback device to a VRF");
780
		return -EOPNOTSUPP;
781
	}
782

783
	port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
784
	ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack);
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785
	if (ret < 0)
786
		goto err;
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787 788 789 790

	cycle_netdev(port_dev);

	return 0;
791 792 793 794

err:
	port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
	return ret;
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795 796
}

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797 798
static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
			 struct netlink_ext_ack *extack)
D
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{
800 801 802 803 804 805 806
	if (netif_is_l3_master(port_dev)) {
		NL_SET_ERR_MSG(extack,
			       "Can not enslave an L3 master device to a VRF");
		return -EINVAL;
	}

	if (netif_is_l3_slave(port_dev))
D
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807 808
		return -EINVAL;

809
	return do_vrf_add_slave(dev, port_dev, extack);
D
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810 811 812 813 814 815
}

/* inverse of do_vrf_add_slave */
static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
{
	netdev_upper_dev_unlink(port_dev, dev);
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816
	port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
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	cycle_netdev(port_dev);

	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);

832 833
	vrf_rtable_release(dev, vrf);
	vrf_rt6_release(dev, vrf);
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834

835
	free_percpu(dev->dstats);
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836 837 838 839 840 841 842 843 844 845 846 847
	dev->dstats = NULL;
}

static int vrf_dev_init(struct net_device *dev)
{
	struct net_vrf *vrf = netdev_priv(dev);

	dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
	if (!dev->dstats)
		goto out_nomem;

	/* create the default dst which points back to us */
848
	if (vrf_rtable_create(dev) != 0)
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849 850
		goto out_stats;

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851 852 853
	if (vrf_rt6_create(dev) != 0)
		goto out_rth;

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854 855
	dev->flags = IFF_MASTER | IFF_NOARP;

856 857 858 859 860
	/* MTU is irrelevant for VRF device; set to 64k similar to lo */
	dev->mtu = 64 * 1024;

	/* similarly, oper state is irrelevant; set to up to avoid confusion */
	dev->operstate = IF_OPER_UP;
861
	netdev_lockdep_set_classes(dev);
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862 863
	return 0;

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864
out_rth:
865
	vrf_rtable_release(dev, vrf);
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866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881
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,
};

882 883 884 885 886 887 888
static u32 vrf_fib_table(const struct net_device *dev)
{
	struct net_vrf *vrf = netdev_priv(dev);

	return vrf->tb_id;
}

889 890
static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
891
	kfree_skb(skb);
892 893 894 895 896 897 898 899 900
	return 0;
}

static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
				      struct sk_buff *skb,
				      struct net_device *dev)
{
	struct net *net = dev_net(dev);

901
	if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1)
902 903 904 905 906
		skb = NULL;    /* kfree_skb(skb) handled by nf code */

	return skb;
}

907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
#if IS_ENABLED(CONFIG_IPV6)
/* 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.
 */
static bool ipv6_ndisc_frame(const struct sk_buff *skb)
{
	const struct ipv6hdr *iph = ipv6_hdr(skb);
	bool rc = false;

	if (iph->nexthdr == NEXTHDR_ICMP) {
		const struct icmp6hdr *icmph;
		struct icmp6hdr _icmph;

		icmph = skb_header_pointer(skb, sizeof(*iph),
					   sizeof(_icmph), &_icmph);
		if (!icmph)
			goto out;

		switch (icmph->icmp6_type) {
		case NDISC_ROUTER_SOLICITATION:
		case NDISC_ROUTER_ADVERTISEMENT:
		case NDISC_NEIGHBOUR_SOLICITATION:
		case NDISC_NEIGHBOUR_ADVERTISEMENT:
		case NDISC_REDIRECT:
			rc = true;
			break;
		}
	}

out:
	return rc;
}

942 943 944 945
static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
					     const struct net_device *dev,
					     struct flowi6 *fl6,
					     int ifindex,
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					     const struct sk_buff *skb,
947 948 949 950
					     int flags)
{
	struct net_vrf *vrf = netdev_priv(dev);

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951
	return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags);
952 953 954 955 956 957 958
}

static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
			      int ifindex)
{
	const struct ipv6hdr *iph = ipv6_hdr(skb);
	struct flowi6 fl6 = {
A
Arnd Bergmann 已提交
959 960 961
		.flowi6_iif     = ifindex,
		.flowi6_mark    = skb->mark,
		.flowi6_proto   = iph->nexthdr,
962 963 964 965 966 967 968
		.daddr          = iph->daddr,
		.saddr          = iph->saddr,
		.flowlabel      = ip6_flowinfo(iph),
	};
	struct net *net = dev_net(vrf_dev);
	struct rt6_info *rt6;

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	rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb,
970 971 972 973 974 975 976 977 978 979
				   RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
	if (unlikely(!rt6))
		return;

	if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
		return;

	skb_dst_set(skb, &rt6->dst);
}

980 981 982
static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
				   struct sk_buff *skb)
{
983 984 985
	int orig_iif = skb->skb_iif;
	bool need_strict;

986 987 988 989 990 991
	/* loopback traffic; do not push through packet taps again.
	 * Reset pkt_type for upper layers to process skb
	 */
	if (skb->pkt_type == PACKET_LOOPBACK) {
		skb->dev = vrf_dev;
		skb->skb_iif = vrf_dev->ifindex;
992
		IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
993 994 995 996
		skb->pkt_type = PACKET_HOST;
		goto out;
	}

997 998 999 1000 1001
	/* if packet is NDISC or addressed to multicast or link-local
	 * then keep the ingress interface
	 */
	need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
	if (!ipv6_ndisc_frame(skb) && !need_strict) {
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David Ahern 已提交
1002
		vrf_rx_stats(vrf_dev, skb->len);
1003 1004 1005
		skb->dev = vrf_dev;
		skb->skb_iif = vrf_dev->ifindex;

1006 1007 1008 1009 1010
		if (!list_empty(&vrf_dev->ptype_all)) {
			skb_push(skb, skb->mac_len);
			dev_queue_xmit_nit(skb, vrf_dev);
			skb_pull(skb, skb->mac_len);
		}
1011 1012 1013 1014

		IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
	}

1015 1016 1017
	if (need_strict)
		vrf_ip6_input_dst(skb, vrf_dev, orig_iif);

1018
	skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
1019
out:
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
	return skb;
}

#else
static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
				   struct sk_buff *skb)
{
	return skb;
}
#endif

static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
				  struct sk_buff *skb)
{
	skb->dev = vrf_dev;
	skb->skb_iif = vrf_dev->ifindex;
1036
	IPCB(skb)->flags |= IPSKB_L3SLAVE;
1037

1038 1039 1040
	if (ipv4_is_multicast(ip_hdr(skb)->daddr))
		goto out;

1041 1042 1043 1044 1045 1046 1047 1048
	/* loopback traffic; do not push through packet taps again.
	 * Reset pkt_type for upper layers to process skb
	 */
	if (skb->pkt_type == PACKET_LOOPBACK) {
		skb->pkt_type = PACKET_HOST;
		goto out;
	}

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David Ahern 已提交
1049 1050
	vrf_rx_stats(vrf_dev, skb->len);

1051 1052 1053 1054 1055
	if (!list_empty(&vrf_dev->ptype_all)) {
		skb_push(skb, skb->mac_len);
		dev_queue_xmit_nit(skb, vrf_dev);
		skb_pull(skb, skb->mac_len);
	}
1056

1057
	skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
1058
out:
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
	return skb;
}

/* called with rcu lock held */
static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
				  struct sk_buff *skb,
				  u16 proto)
{
	switch (proto) {
	case AF_INET:
		return vrf_ip_rcv(vrf_dev, skb);
	case AF_INET6:
		return vrf_ip6_rcv(vrf_dev, skb);
	}

	return skb;
}

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1077
#if IS_ENABLED(CONFIG_IPV6)
1078 1079 1080 1081 1082
/* send to link-local or multicast address via interface enslaved to
 * VRF device. Force lookup to VRF table without changing flow struct
 */
static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
					      struct flowi6 *fl6)
D
David Ahern 已提交
1083
{
1084
	struct net *net = dev_net(dev);
1085
	int flags = RT6_LOOKUP_F_IFACE;
1086
	struct dst_entry *dst = NULL;
1087
	struct rt6_info *rt;
D
David Ahern 已提交
1088

1089 1090 1091 1092 1093 1094 1095 1096
	/* VRF device does not have a link-local address and
	 * sending packets to link-local or mcast addresses over
	 * a VRF device does not make sense
	 */
	if (fl6->flowi6_oif == dev->ifindex) {
		dst = &net->ipv6.ip6_null_entry->dst;
		dst_hold(dst);
		return dst;
D
David Ahern 已提交
1097 1098
	}

1099 1100 1101
	if (!ipv6_addr_any(&fl6->saddr))
		flags |= RT6_LOOKUP_F_HAS_SADDR;

D
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1102
	rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags);
1103 1104
	if (rt)
		dst = &rt->dst;
1105

1106
	return dst;
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1107 1108 1109
}
#endif

1110 1111
static const struct l3mdev_ops vrf_l3mdev_ops = {
	.l3mdev_fib_table	= vrf_fib_table,
1112
	.l3mdev_l3_rcv		= vrf_l3_rcv,
1113
	.l3mdev_l3_out		= vrf_l3_out,
D
David Ahern 已提交
1114
#if IS_ENABLED(CONFIG_IPV6)
1115
	.l3mdev_link_scope_lookup = vrf_link_scope_lookup,
D
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1116
#endif
1117 1118
};

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1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
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,
};

1130 1131 1132 1133 1134 1135 1136
static inline size_t vrf_fib_rule_nl_size(void)
{
	size_t sz;

	sz  = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
	sz += nla_total_size(sizeof(u8));	/* FRA_L3MDEV */
	sz += nla_total_size(sizeof(u32));	/* FRA_PRIORITY */
1137
	sz += nla_total_size(sizeof(u8));       /* FRA_PROTOCOL */
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148

	return sz;
}

static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
{
	struct fib_rule_hdr *frh;
	struct nlmsghdr *nlh;
	struct sk_buff *skb;
	int err;

1149 1150 1151
	if (family == AF_INET6 && !ipv6_mod_enabled())
		return 0;

1152 1153 1154 1155 1156 1157 1158 1159 1160
	skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
	if (!nlh)
		goto nla_put_failure;

	/* rule only needs to appear once */
1161
	nlh->nlmsg_flags |= NLM_F_EXCL;
1162 1163 1164 1165 1166

	frh = nlmsg_data(nlh);
	memset(frh, 0, sizeof(*frh));
	frh->family = family;
	frh->action = FR_ACT_TO_TBL;
1167 1168 1169

	if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL))
		goto nla_put_failure;
1170

1171
	if (nla_put_u8(skb, FRA_L3MDEV, 1))
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
		goto nla_put_failure;

	if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
		goto nla_put_failure;

	nlmsg_end(skb, nlh);

	/* fib_nl_{new,del}rule handling looks for net from skb->sk */
	skb->sk = dev_net(dev)->rtnl;
	if (add_it) {
1182
		err = fib_nl_newrule(skb, nlh, NULL);
1183 1184 1185
		if (err == -EEXIST)
			err = 0;
	} else {
1186
		err = fib_nl_delrule(skb, nlh, NULL);
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
		if (err == -ENOENT)
			err = 0;
	}
	nlmsg_free(skb);

	return err;

nla_put_failure:
	nlmsg_free(skb);

	return -EMSGSIZE;
}

static int vrf_add_fib_rules(const struct net_device *dev)
{
	int err;

	err = vrf_fib_rule(dev, AF_INET,  true);
	if (err < 0)
		goto out_err;

	err = vrf_fib_rule(dev, AF_INET6, true);
	if (err < 0)
		goto ipv6_err;

1212 1213 1214 1215 1216 1217
#if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
	err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true);
	if (err < 0)
		goto ipmr_err;
#endif

1218 1219 1220 1221 1222 1223
#if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
	err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true);
	if (err < 0)
		goto ip6mr_err;
#endif

1224 1225
	return 0;

1226 1227 1228 1229 1230
#if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
ip6mr_err:
	vrf_fib_rule(dev, RTNL_FAMILY_IPMR,  false);
#endif

1231 1232 1233 1234 1235
#if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
ipmr_err:
	vrf_fib_rule(dev, AF_INET6,  false);
#endif

1236 1237 1238 1239 1240 1241 1242 1243
ipv6_err:
	vrf_fib_rule(dev, AF_INET,  false);

out_err:
	netdev_err(dev, "Failed to add FIB rules.\n");
	return err;
}

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static void vrf_setup(struct net_device *dev)
{
	ether_setup(dev);

	/* Initialize the device structure. */
	dev->netdev_ops = &vrf_netdev_ops;
1250
	dev->l3mdev_ops = &vrf_l3mdev_ops;
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	dev->ethtool_ops = &vrf_ethtool_ops;
1252
	dev->needs_free_netdev = true;
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	/* 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;
1262 1263 1264 1265 1266 1267

	/* does not make sense for a VLAN to be added to a vrf device */
	dev->features   |= NETIF_F_VLAN_CHALLENGED;

	/* enable offload features */
	dev->features   |= NETIF_F_GSO_SOFTWARE;
1268
	dev->features   |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC;
1269 1270 1271 1272 1273 1274 1275
	dev->features   |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;

	dev->hw_features = dev->features;
	dev->hw_enc_features = dev->features;

	/* default to no qdisc; user can add if desired */
	dev->priv_flags |= IFF_NO_QUEUE;
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}

1278 1279
static int vrf_validate(struct nlattr *tb[], struct nlattr *data[],
			struct netlink_ext_ack *extack)
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{
	if (tb[IFLA_ADDRESS]) {
1282 1283
		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
			NL_SET_ERR_MSG(extack, "Invalid hardware address");
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			return -EINVAL;
1285 1286 1287
		}
		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
			NL_SET_ERR_MSG(extack, "Invalid hardware address");
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			return -EADDRNOTAVAIL;
1289
		}
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	}
	return 0;
}

static void vrf_dellink(struct net_device *dev, struct list_head *head)
{
1296 1297 1298 1299 1300 1301
	struct net_device *port_dev;
	struct list_head *iter;

	netdev_for_each_lower_dev(dev, port_dev, iter)
		vrf_del_slave(dev, port_dev);

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	unregister_netdevice_queue(dev, head);
}

static int vrf_newlink(struct net *src_net, struct net_device *dev,
1306 1307
		       struct nlattr *tb[], struct nlattr *data[],
		       struct netlink_ext_ack *extack)
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{
	struct net_vrf *vrf = netdev_priv(dev);
1310 1311
	bool *add_fib_rules;
	struct net *net;
1312
	int err;
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1313

1314 1315
	if (!data || !data[IFLA_VRF_TABLE]) {
		NL_SET_ERR_MSG(extack, "VRF table id is missing");
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		return -EINVAL;
1317
	}
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	vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
1320 1321 1322
	if (vrf->tb_id == RT_TABLE_UNSPEC) {
		NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE],
				    "Invalid VRF table id");
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		return -EINVAL;
1324
	}
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1325

1326
	dev->priv_flags |= IFF_L3MDEV_MASTER;
D
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1328 1329 1330 1331
	err = register_netdevice(dev);
	if (err)
		goto out;

1332 1333 1334
	net = dev_net(dev);
	add_fib_rules = net_generic(net, vrf_net_id);
	if (*add_fib_rules) {
1335 1336 1337 1338 1339
		err = vrf_add_fib_rules(dev);
		if (err) {
			unregister_netdevice(dev);
			goto out;
		}
1340
		*add_fib_rules = false;
1341 1342 1343 1344
	}

out:
	return err;
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}

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);
}

1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
static size_t vrf_get_slave_size(const struct net_device *bond_dev,
				 const struct net_device *slave_dev)
{
	return nla_total_size(sizeof(u32));  /* IFLA_VRF_PORT_TABLE */
}

static int vrf_fill_slave_info(struct sk_buff *skb,
			       const struct net_device *vrf_dev,
			       const struct net_device *slave_dev)
{
	struct net_vrf *vrf = netdev_priv(vrf_dev);

	if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
		return -EMSGSIZE;

	return 0;
}

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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,

1391 1392 1393
	.get_slave_size  = vrf_get_slave_size,
	.fill_slave_info = vrf_fill_slave_info,

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	.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;

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		if (!netif_is_l3_slave(dev))
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			goto out;

1412 1413
		vrf_dev = netdev_master_upper_dev_get(dev);
		vrf_del_slave(vrf_dev, dev);
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	}
out:
	return NOTIFY_DONE;
}

static struct notifier_block vrf_notifier_block __read_mostly = {
	.notifier_call = vrf_device_event,
};

1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438
/* Initialize per network namespace state */
static int __net_init vrf_netns_init(struct net *net)
{
	bool *add_fib_rules = net_generic(net, vrf_net_id);

	*add_fib_rules = true;

	return 0;
}

static struct pernet_operations vrf_net_ops __net_initdata = {
	.init = vrf_netns_init,
	.id   = &vrf_net_id,
	.size = sizeof(bool),
};

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static int __init vrf_init_module(void)
{
	int rc;

	register_netdevice_notifier(&vrf_notifier_block);

1445
	rc = register_pernet_subsys(&vrf_net_ops);
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	if (rc < 0)
		goto error;

1449 1450 1451 1452 1453 1454
	rc = rtnl_link_register(&vrf_link_ops);
	if (rc < 0) {
		unregister_pernet_subsys(&vrf_net_ops);
		goto error;
	}

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	return 0;

error:
	unregister_netdevice_notifier(&vrf_notifier_block);
	return rc;
}

module_init(vrf_init_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);