Patchwork [net-next,v6,4/5] vxlan: add ipv6 support

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Submitter Amerigo Wang
Date April 24, 2013, 5:54 a.m.
Message ID <1366782874-18700-5-git-send-email-amwang@redhat.com>
Download mbox | patch
Permalink /patch/239045/
State Changes Requested
Delegated to: David Miller
Headers show

Comments

Amerigo Wang - April 24, 2013, 5:54 a.m.
From: Cong Wang <amwang@redhat.com>

This patch adds IPv6 support to vxlan device, as the new version
RFC already mentions it:

   http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-03

There are still few things need to fix, e.g. scope id for ll addr,
as pointed out by David, I put them in my TODO list.

Cc: David Stevens <dlstevens@us.ibm.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
---
 drivers/net/vxlan.c          |  636 +++++++++++++++++++++++++++++++++---------
 include/uapi/linux/if_link.h |    2 +
 2 files changed, 502 insertions(+), 136 deletions(-)
David Miller - April 29, 2013, 3:52 p.m.
From: Cong Wang <amwang@redhat.com>
Date: Wed, 24 Apr 2013 13:54:33 +0800

> +	rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &vn->sock);
> +	if (rc < 0) {
> +		pr_debug("UDP socket create failed\n");
> +		return rc;
> +	}

You have to fall back to creating and using an ipv4 socket if making
the ipv6 one fails.

IPV6 being enabled does not mean it is guaranteed the one can
successfully create ipv6 sockets.

You also must handle /proc/sys/net/ipv6/conf/${DEV}/disable_ipv6
correctly as far as this stuff goes as well.

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Amerigo Wang - April 30, 2013, 3:59 a.m.
On Mon, 2013-04-29 at 11:52 -0400, David Miller wrote:
> From: Cong Wang <amwang@redhat.com>
> Date: Wed, 24 Apr 2013 13:54:33 +0800
> 
> > +	rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &vn->sock);
> > +	if (rc < 0) {
> > +		pr_debug("UDP socket create failed\n");
> > +		return rc;
> > +	}
> 
> You have to fall back to creating and using an ipv4 socket if making
> the ipv6 one fails.
> 
> IPV6 being enabled does not mean it is guaranteed the one can
> successfully create ipv6 sockets.
> 
> You also must handle /proc/sys/net/ipv6/conf/${DEV}/disable_ipv6
> correctly as far as this stuff goes as well.
> 

Right, we should detect the run-time IPv6 support too.


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Patch

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index a0ca469..be42e00 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -9,7 +9,6 @@ 
  *
  * TODO
  *  - use IANA UDP port number (when defined)
- *  - IPv6 (not in RFC)
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -42,6 +41,11 @@ 
 #include <net/inet_ecn.h>
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+#include <net/ip6_tunnel.h>
+#endif
 
 #define VXLAN_VERSION	"0.1"
 
@@ -56,6 +60,7 @@ 
 #define VXLAN_VID_MASK	(VXLAN_N_VID - 1)
 /* IP header + UDP + VXLAN + Ethernet header */
 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
+#define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
 
 #define VXLAN_FLAGS 0x08000000	/* struct vxlanhdr.vx_flags required value. */
 
@@ -81,9 +86,15 @@  struct vxlan_net {
 	struct hlist_head vni_list[VNI_HASH_SIZE];
 };
 
+union vxlan_addr {
+	struct sockaddr_in	sin;
+	struct sockaddr_in6	sin6;
+	struct sockaddr		sa;
+};
+
 struct vxlan_rdst {
 	struct rcu_head		 rcu;
-	__be32			 remote_ip;
+	union vxlan_addr	 remote_ip;
 	__be16			 remote_port;
 	u32			 remote_vni;
 	u32			 remote_ifindex;
@@ -107,7 +118,7 @@  struct vxlan_dev {
 	struct hlist_node hlist;
 	struct net_device *dev;
 	struct vxlan_rdst default_dst;	/* default destination */
-	__be32		  saddr;	/* source address */
+	union vxlan_addr saddr;		/* source address */
 	__u16		  port_min;	/* source port range */
 	__u16		  port_max;
 	__u8		  tos;		/* TOS override */
@@ -129,6 +140,69 @@  struct vxlan_dev {
 #define VXLAN_F_L2MISS	0x08
 #define VXLAN_F_L3MISS	0x10
 
+static inline
+bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	if (a->sa.sa_family != b->sa.sa_family)
+		return false;
+	if (a->sa.sa_family == AF_INET6)
+		return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
+	else
+#endif
+		return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
+}
+
+static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	if (ipa->sa.sa_family == AF_INET6)
+		return ipv6_addr_any(&ipa->sin6.sin6_addr);
+	else
+#endif
+		return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
+}
+
+static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	if (ipa->sa.sa_family == AF_INET6)
+		return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
+	else
+#endif
+		return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
+}
+
+static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
+{
+	if (nla_len(nla) >= sizeof(struct in6_addr)) {
+#if IS_ENABLED(CONFIG_IPV6)
+		nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
+		ip->sa.sa_family = AF_INET6;
+		return 0;
+#else
+		return -EAFNOSUPPORT;
+#endif
+	} else if (nla_len(nla) >= sizeof(__be32)) {
+		ip->sin.sin_addr.s_addr = nla_get_be32(nla);
+		ip->sa.sa_family = AF_INET;
+		return 0;
+	} else {
+		return -EAFNOSUPPORT;
+	}
+}
+
+static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
+			      const union vxlan_addr *ip)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	if (ip->sa.sa_family == AF_INET6)
+		return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
+	else
+#endif
+		return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
+}
+
 /* salt for hash table */
 static u32 vxlan_salt __read_mostly;
 
@@ -175,7 +249,7 @@  static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 
 	if (type == RTM_GETNEIGH) {
 		ndm->ndm_family	= AF_INET;
-		send_ip = rdst->remote_ip != htonl(INADDR_ANY);
+		send_ip = !vxlan_addr_any(&rdst->remote_ip);
 		send_eth = !is_zero_ether_addr(fdb->eth_addr);
 	} else
 		ndm->ndm_family	= AF_BRIDGE;
@@ -187,7 +261,7 @@  static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 	if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 		goto nla_put_failure;
 
-	if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip))
+	if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 		goto nla_put_failure;
 
 	if (rdst->remote_port && rdst->remote_port != vxlan_port &&
@@ -219,7 +293,7 @@  static inline size_t vxlan_nlmsg_size(void)
 {
 	return NLMSG_ALIGN(sizeof(struct ndmsg))
 		+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
-		+ nla_total_size(sizeof(__be32)) /* NDA_DST */
+		+ nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 		+ nla_total_size(sizeof(__be32)) /* NDA_PORT */
 		+ nla_total_size(sizeof(__be32)) /* NDA_VNI */
 		+ nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
@@ -252,14 +326,14 @@  errout:
 		rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 }
 
-static void vxlan_ip_miss(struct net_device *dev, __be32 ipa)
+static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct vxlan_fdb f;
 
 	memset(&f, 0, sizeof f);
 	f.state = NUD_STALE;
-	f.remote.remote_ip = ipa; /* goes to NDA_DST */
+	f.remote.remote_ip = *ipa; /* goes to NDA_DST */
 	f.remote.remote_vni = VXLAN_N_VID;
 
 	vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
@@ -314,14 +388,14 @@  static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 }
 
 /* Add/update destinations for multicast */
-static int vxlan_fdb_append(struct vxlan_fdb *f,
-			    __be32 ip, __u32 port, __u32 vni, __u32 ifindex)
+static int vxlan_fdb_append(struct vxlan_fdb *f, union vxlan_addr *ip,
+			    __u32 port, __u32 vni, __u32 ifindex)
 {
 	struct vxlan_rdst *rd_prev, *rd;
 
 	rd_prev = NULL;
 	for (rd = &f->remote; rd; rd = rd->remote_next) {
-		if (rd->remote_ip == ip &&
+		if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 		    rd->remote_port == port &&
 		    rd->remote_vni == vni &&
 		    rd->remote_ifindex == ifindex)
@@ -331,7 +405,7 @@  static int vxlan_fdb_append(struct vxlan_fdb *f,
 	rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 	if (rd == NULL)
 		return -ENOBUFS;
-	rd->remote_ip = ip;
+	rd->remote_ip = *ip;
 	rd->remote_port = port;
 	rd->remote_vni = vni;
 	rd->remote_ifindex = ifindex;
@@ -342,7 +416,7 @@  static int vxlan_fdb_append(struct vxlan_fdb *f,
 
 /* Add new entry to forwarding table -- assumes lock held */
 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
-			    const u8 *mac, __be32 ip,
+			    const u8 *mac, union vxlan_addr *ip,
 			    __u16 state, __u16 flags,
 			    __u32 port, __u32 vni, __u32 ifindex,
 			    __u8 ndm_flags)
@@ -382,13 +456,20 @@  static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 		if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
 			return -ENOSPC;
 
-		netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip);
+#if IS_ENABLED(CONFIG_IPV6)
+		if (ip->sa.sa_family == AF_INET6)
+			netdev_dbg(vxlan->dev, "add %pM -> %pI6\n", mac,
+				   &ip->sin6.sin6_addr);
+		else
+#endif
+			netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac,
+				   &ip->sin.sin_addr.s_addr);
 		f = kmalloc(sizeof(*f), GFP_ATOMIC);
 		if (!f)
 			return -ENOMEM;
 
 		notify = 1;
-		f->remote.remote_ip = ip;
+		f->remote.remote_ip = *ip;
 		f->remote.remote_port = port;
 		f->remote.remote_vni = vni;
 		f->remote.remote_ifindex = ifindex;
@@ -441,7 +522,7 @@  static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct net *net = dev_net(vxlan->dev);
-	__be32 ip;
+	union vxlan_addr ip;
 	u32 port, vni, ifindex;
 	int err;
 
@@ -454,10 +535,9 @@  static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 	if (tb[NDA_DST] == NULL)
 		return -EINVAL;
 
-	if (nla_len(tb[NDA_DST]) != sizeof(__be32))
-		return -EAFNOSUPPORT;
-
-	ip = nla_get_be32(tb[NDA_DST]);
+	err = vxlan_nla_get_addr(&ip, tb[NDA_DST]);
+	if (err)
+		return err;
 
 	if (tb[NDA_PORT]) {
 		if (nla_len(tb[NDA_PORT]) != sizeof(u32))
@@ -487,7 +567,7 @@  static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 		ifindex = 0;
 
 	spin_lock_bh(&vxlan->hash_lock);
-	err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags, port,
+	err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags, port,
 		vni, ifindex, ndm->ndm_flags);
 	spin_unlock_bh(&vxlan->hash_lock);
 
@@ -551,7 +631,7 @@  skip:
  * and Tunnel endpoint.
  */
 static void vxlan_snoop(struct net_device *dev,
-			__be32 src_ip, const u8 *src_mac)
+			union vxlan_addr *src_ip, const u8 *src_mac)
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct vxlan_fdb *f;
@@ -560,15 +640,25 @@  static void vxlan_snoop(struct net_device *dev,
 	f = vxlan_find_mac(vxlan, src_mac);
 	if (likely(f)) {
 		f->used = jiffies;
-		if (likely(f->remote.remote_ip == src_ip))
+		if (likely(vxlan_addr_equal(&f->remote.remote_ip, src_ip)))
 			return;
 
-		if (net_ratelimit())
-			netdev_info(dev,
-				    "%pM migrated from %pI4 to %pI4\n",
-				    src_mac, &f->remote.remote_ip, &src_ip);
+		if (net_ratelimit()) {
+#if IS_ENABLED(CONFIG_IPV6)
+			if (src_ip->sa.sa_family == AF_INET6)
+				netdev_info(dev,
+					    "%pM migrated from %pI6 to %pI6\n",
+					    src_mac, &f->remote.remote_ip.sin6.sin6_addr,
+					    &src_ip->sin6.sin6_addr);
+			else
+#endif
+				netdev_info(dev,
+					    "%pM migrated from %pI4 to %pI4\n",
+					    src_mac, &f->remote.remote_ip.sin.sin_addr.s_addr,
+					    &src_ip->sin.sin_addr.s_addr);
+		}
 
-		f->remote.remote_ip = src_ip;
+		f->remote.remote_ip = *src_ip;
 		f->updated = jiffies;
 	} else {
 		/* learned new entry */
@@ -599,7 +689,8 @@  static bool vxlan_group_used(struct vxlan_net *vn,
 			if (!netif_running(vxlan->dev))
 				continue;
 
-			if (vxlan->default_dst.remote_ip == this->default_dst.remote_ip)
+			if (vxlan_addr_equal(&vxlan->default_dst.remote_ip,
+					     &this->default_dst.remote_ip))
 				return true;
 		}
 
@@ -612,8 +703,9 @@  static int vxlan_join_group(struct net_device *dev)
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
 	struct sock *sk = vn->sock->sk;
+	union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
 	struct ip_mreqn mreq = {
-		.imr_multiaddr.s_addr	= vxlan->default_dst.remote_ip,
+		.imr_multiaddr.s_addr	= ip->sin.sin_addr.s_addr,
 		.imr_ifindex		= vxlan->default_dst.remote_ifindex,
 	};
 	int err;
@@ -625,7 +717,13 @@  static int vxlan_join_group(struct net_device *dev)
 	/* Need to drop RTNL to call multicast join */
 	rtnl_unlock();
 	lock_sock(sk);
-	err = ip_mc_join_group(sk, &mreq);
+#if IS_ENABLED(CONFIG_IPV6)
+	if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
+		err = ipv6_mcast_ops->ipv6_sock_mc_join(sk, vxlan->default_dst.remote_ifindex,
+							&ip->sin6.sin6_addr);
+	else
+#endif
+		err = ip_mc_join_group(sk, &mreq);
 	release_sock(sk);
 	rtnl_lock();
 
@@ -640,8 +738,9 @@  static int vxlan_leave_group(struct net_device *dev)
 	struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
 	int err = 0;
 	struct sock *sk = vn->sock->sk;
+	union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
 	struct ip_mreqn mreq = {
-		.imr_multiaddr.s_addr	= vxlan->default_dst.remote_ip,
+		.imr_multiaddr.s_addr	= ip->sin.sin_addr.s_addr,
 		.imr_ifindex		= vxlan->default_dst.remote_ifindex,
 	};
 
@@ -652,7 +751,13 @@  static int vxlan_leave_group(struct net_device *dev)
 	/* Need to drop RTNL to call multicast leave */
 	rtnl_unlock();
 	lock_sock(sk);
-	err = ip_mc_leave_group(sk, &mreq);
+#if IS_ENABLED(CONFIG_IPV6)
+	if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
+		err = ipv6_mcast_ops->ipv6_sock_mc_drop(sk, vxlan->default_dst.remote_ifindex,
+							&ip->sin6.sin6_addr);
+	else
+#endif
+		err = ip_mc_leave_group(sk, &mreq);
 	release_sock(sk);
 	rtnl_lock();
 
@@ -662,12 +767,16 @@  static int vxlan_leave_group(struct net_device *dev)
 /* Callback from net/ipv4/udp.c to receive packets */
 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 {
-	struct iphdr *oip;
+	struct iphdr *oip = NULL;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct ipv6hdr *oip6 = NULL;
+#endif
 	struct vxlanhdr *vxh;
 	struct vxlan_dev *vxlan;
 	struct pcpu_tstats *stats;
+	union vxlan_addr src_ip;
 	__u32 vni;
-	int err;
+	int err = 0;
 
 	/* pop off outer UDP header */
 	__skb_pull(skb, sizeof(struct udphdr));
@@ -704,7 +813,13 @@  static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 	skb_reset_mac_header(skb);
 
 	/* Re-examine inner Ethernet packet */
-	oip = ip_hdr(skb);
+	if (skb->protocol == htons(ETH_P_IP))
+		oip = ip_hdr(skb);
+#if IS_ENABLED(CONFIG_IPV6)
+	if (skb->protocol == htons(ETH_P_IPV6))
+		oip6 = ipv6_hdr(skb);
+#endif
+
 	skb->protocol = eth_type_trans(skb, vxlan->dev);
 
 	/* Ignore packet loops (and multicast echo) */
@@ -712,8 +827,19 @@  static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 			       vxlan->dev->dev_addr) == 0)
 		goto drop;
 
-	if (vxlan->flags & VXLAN_F_LEARN)
-		vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source);
+	if (vxlan->flags & VXLAN_F_LEARN) {
+		if (oip) {
+			src_ip.sin.sin_addr.s_addr = oip->saddr;
+			src_ip.sa.sa_family = AF_INET;
+		}
+#if IS_ENABLED(CONFIG_IPV6)
+		if (oip6) {
+			src_ip.sin6.sin6_addr = oip6->saddr;
+			src_ip.sa.sa_family = AF_INET6;
+		}
+#endif
+		vxlan_snoop(skb->dev, &src_ip, eth_hdr(skb)->h_source);
+	}
 
 	__skb_tunnel_rx(skb, vxlan->dev);
 	skb_reset_network_header(skb);
@@ -729,11 +855,24 @@  static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 
 	skb->encapsulation = 0;
 
-	err = IP_ECN_decapsulate(oip, skb);
+#if IS_ENABLED(CONFIG_IPV6)
+	if (oip6)
+		err = IP6_ECN_decapsulate(oip6, skb);
+#endif
+	if (oip)
+		err = IP_ECN_decapsulate(oip, skb);
+
 	if (unlikely(err)) {
-		if (log_ecn_error)
-			net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
-					     &oip->saddr, oip->tos);
+		if (log_ecn_error) {
+#if IS_ENABLED(CONFIG_IPV6)
+			if (oip6)
+				net_info_ratelimited("non-ECT from %pI6\n",
+						     &oip6->saddr);
+#endif
+			if (oip)
+				net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
+						     &oip->saddr, oip->tos);
+		}
 		if (err > 1) {
 			++vxlan->dev->stats.rx_frame_errors;
 			++vxlan->dev->stats.rx_errors;
@@ -768,6 +907,7 @@  static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
 	u8 *arpptr, *sha;
 	__be32 sip, tip;
 	struct neighbour *n;
+	union vxlan_addr ipa;
 
 	if (dev->flags & IFF_NOARP)
 		goto out;
@@ -809,7 +949,7 @@  static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
 		}
 
 		f = vxlan_find_mac(vxlan, n->ha);
-		if (f && f->remote.remote_ip == htonl(INADDR_ANY)) {
+		if (f && vxlan_addr_any(&f->remote.remote_ip)) {
 			/* bridge-local neighbor */
 			neigh_release(n);
 			goto out;
@@ -827,8 +967,11 @@  static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
 
 		if (netif_rx_ni(reply) == NET_RX_DROP)
 			dev->stats.rx_dropped++;
-	} else if (vxlan->flags & VXLAN_F_L3MISS)
-		vxlan_ip_miss(dev, tip);
+	} else if (vxlan->flags & VXLAN_F_L3MISS) {
+		ipa.sin.sin_addr.s_addr = tip;
+		ipa.sa.sa_family = AF_INET;
+		vxlan_ip_miss(dev, &ipa);
+	}
 out:
 	consume_skb(skb);
 	return NETDEV_TX_OK;
@@ -850,6 +993,14 @@  static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
 			return false;
 		pip = ip_hdr(skb);
 		n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
+		if (!n && vxlan->flags & VXLAN_F_L3MISS) {
+			union vxlan_addr ipa;
+			ipa.sin.sin_addr.s_addr = pip->daddr;
+			ipa.sa.sa_family = AF_INET;
+			vxlan_ip_miss(dev, &ipa);
+			return false;
+		}
+
 		break;
 	default:
 		return false;
@@ -866,8 +1017,8 @@  static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
 		}
 		neigh_release(n);
 		return diff;
-	} else if (vxlan->flags & VXLAN_F_L3MISS)
-		vxlan_ip_miss(dev, pip->daddr);
+	}
+
 	return false;
 }
 
@@ -877,7 +1028,8 @@  static void vxlan_sock_free(struct sk_buff *skb)
 }
 
 /* On transmit, associate with the tunnel socket */
-static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb)
+static inline void vxlan_set_owner(struct net_device *dev,
+				   struct sk_buff *skb)
 {
 	struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
 	struct sock *sk = vn->sock->sk;
@@ -926,15 +1078,26 @@  static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
 {
 	struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
 	struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
+	union vxlan_addr loopback;
 
 	skb->pkt_type = PACKET_HOST;
 	skb->encapsulation = 0;
 	skb->dev = dst_vxlan->dev;
 	__skb_pull(skb, skb_network_offset(skb));
 
+	if (dst_vxlan->default_dst.remote_ip.sa.sa_family == AF_INET) {
+		loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+		loopback.sa.sa_family =  AF_INET;
+	}
+#if IS_ENABLED(CONFIG_IPV6)
+	else {
+		loopback.sin6.sin6_addr = in6addr_loopback;
+		loopback.sa.sa_family =  AF_INET6;
+	}
+#endif
+
 	if (dst_vxlan->flags & VXLAN_F_LEARN)
-		vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK),
-			    eth_hdr(skb)->h_source);
+		vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
 
 	u64_stats_update_begin(&tx_stats->syncp);
 	tx_stats->tx_packets++;
@@ -956,22 +1119,29 @@  static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct rtable *rt;
-	const struct iphdr *old_iph;
+	const struct iphdr *old_iph = NULL;
 	struct iphdr *iph;
 	struct vxlanhdr *vxh;
 	struct udphdr *uh;
 	struct flowi4 fl4;
-	__be32 dst;
-	__u16 src_port, dst_port;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct flowi6 fl6;
+	struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
+	struct sock *sk = vn->sock->sk;
+	struct ipv6hdr *ip6h;
+#endif
+	const union vxlan_addr *dst;
+	struct dst_entry *ndst = NULL;
+	__u16 src_port = 0, dst_port;
         u32 vni;
 	__be16 df = 0;
 	__u8 tos, ttl;
 
 	dst_port = rdst->remote_port ? rdst->remote_port : vxlan_port;
 	vni = rdst->remote_vni;
-	dst = rdst->remote_ip;
+	dst = &rdst->remote_ip;
 
-	if (!dst) {
+	if (vxlan_addr_any(dst)) {
 		if (did_rsc) {
 			/* short-circuited back to local bridge */
 			vxlan_encap_bypass(skb, vxlan, vxlan);
@@ -985,60 +1155,119 @@  static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 		skb->encapsulation = 1;
 	}
 
-	/* Need space for new headers (invalidates iph ptr) */
-	if (skb_cow_head(skb, VXLAN_HEADROOM))
-		goto drop;
+	ttl = vxlan->ttl;
+	tos = vxlan->tos;
+	if (dst->sa.sa_family == AF_INET) {
+		/* Need space for new headers (invalidates iph ptr) */
+		if (skb_cow_head(skb, VXLAN_HEADROOM))
+			goto drop;
 
-	old_iph = ip_hdr(skb);
+		old_iph = ip_hdr(skb);
+		if (!ttl && IN_MULTICAST(ntohl(dst->sin.sin_addr.s_addr)))
+			ttl = 1;
 
-	ttl = vxlan->ttl;
-	if (!ttl && IN_MULTICAST(ntohl(dst)))
-		ttl = 1;
+		if (tos == 1)
+			tos = ip_tunnel_get_dsfield(old_iph, skb);
 
-	tos = vxlan->tos;
-	if (tos == 1)
-		tos = ip_tunnel_get_dsfield(old_iph, skb);
-
-	src_port = vxlan_src_port(vxlan, skb);
-
-	memset(&fl4, 0, sizeof(fl4));
-	fl4.flowi4_oif = rdst->remote_ifindex;
-	fl4.flowi4_tos = RT_TOS(tos);
-	fl4.daddr = dst;
-	fl4.saddr = vxlan->saddr;
-
-	rt = ip_route_output_key(dev_net(dev), &fl4);
-	if (IS_ERR(rt)) {
-		netdev_dbg(dev, "no route to %pI4\n", &dst);
-		dev->stats.tx_carrier_errors++;
-		goto tx_error;
-	}
+		src_port = vxlan_src_port(vxlan, skb);
 
-	if (rt->dst.dev == dev) {
-		netdev_dbg(dev, "circular route to %pI4\n", &dst);
-		ip_rt_put(rt);
-		dev->stats.collisions++;
-		goto tx_error;
-	}
+		memset(&fl4, 0, sizeof(fl4));
+		fl4.flowi4_oif = rdst->remote_ifindex;
+		fl4.flowi4_tos = RT_TOS(tos);
+		fl4.daddr = dst->sin.sin_addr.s_addr;
+		fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
 
-	/* Bypass encapsulation if the destination is local */
-	if (rt->rt_flags & RTCF_LOCAL &&
-	    !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
-		struct vxlan_dev *dst_vxlan;
+		rt = ip_route_output_key(dev_net(dev), &fl4);
+		if (IS_ERR(rt)) {
+			netdev_dbg(dev, "no route to %pI4\n",
+				   &dst->sin.sin_addr.s_addr);
+			dev->stats.tx_carrier_errors++;
+			goto tx_error;
+		}
 
-		ip_rt_put(rt);
-		dst_vxlan = vxlan_find_vni(dev_net(dev), vni);
-		if (!dst_vxlan)
+		if (rt->dst.dev == dev) {
+			netdev_dbg(dev, "circular route to %pI4\n",
+				   &dst->sin.sin_addr.s_addr);
+			ip_rt_put(rt);
+			dev->stats.collisions++;
 			goto tx_error;
-		vxlan_encap_bypass(skb, vxlan, dst_vxlan);
-		return NETDEV_TX_OK;
+		}
+
+		/* Bypass encapsulation if the destination is local */
+		if (rt->rt_flags & RTCF_LOCAL &&
+		    !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
+			struct vxlan_dev *dst_vxlan;
+
+			ip_rt_put(rt);
+			dst_vxlan = vxlan_find_vni(dev_net(dev), vni);
+			if (!dst_vxlan)
+				goto tx_error;
+			vxlan_encap_bypass(skb, vxlan, dst_vxlan);
+			return NETDEV_TX_OK;
+		}
+
+		ndst = &rt->dst;
+	} else {
+#if IS_ENABLED(CONFIG_IPV6)
+		const struct ipv6hdr *old_iph6;
+		u32 flags;
+
+		/* Need space for new headers (invalidates ipv6h ptr) */
+		if (skb_cow_head(skb, VXLAN6_HEADROOM))
+			goto drop;
+
+		old_iph6 = ipv6_hdr(skb);
+		if (!ttl && ipv6_addr_is_multicast(&dst->sin6.sin6_addr))
+			ttl = 1;
+
+		if (tos == 1)
+			tos = ipv6_get_dsfield(old_iph6);
+
+		src_port = vxlan_src_port(vxlan, skb);
+
+		memset(&fl6, 0, sizeof(fl6));
+		fl6.flowi6_oif = rdst->remote_ifindex;
+		fl6.flowi6_tos = RT_TOS(tos);
+		fl6.daddr = dst->sin6.sin6_addr;
+		fl6.saddr = vxlan->saddr.sin6.sin6_addr;
+		fl6.flowi6_proto = skb->protocol;
+
+		if (ip6_dst_lookup(sk, &ndst, &fl6)) {
+			netdev_dbg(dev, "no route to %pI6\n",
+				   &dst->sin6.sin6_addr);
+			dev->stats.tx_carrier_errors++;
+			goto tx_error;
+		}
+
+		if (ndst->dev == dev) {
+			netdev_dbg(dev, "circular route to %pI6\n",
+				   &dst->sin6.sin6_addr);
+			dst_release(ndst);
+			dev->stats.collisions++;
+			goto tx_error;
+		}
+
+		/* Bypass encapsulation if the destination is local */
+		flags = ((struct rt6_info *)ndst)->rt6i_flags;
+		if (flags & RTF_LOCAL &&
+		    !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
+			struct vxlan_dev *dst_vxlan;
+
+			dst_release(ndst);
+			dst_vxlan = vxlan_find_vni(dev_net(dev), vni);
+			if (!dst_vxlan)
+				goto tx_error;
+			vxlan_encap_bypass(skb, vxlan, dst_vxlan);
+			return NETDEV_TX_OK;
+		}
+#endif
 	}
 
 	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 	IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
 			      IPSKB_REROUTED);
 	skb_dst_drop(skb);
-	skb_dst_set(skb, &rt->dst);
+	skb_dst_set(skb, ndst);
 
 	vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
 	vxh->vx_flags = htonl(VXLAN_FLAGS);
@@ -1054,27 +1283,63 @@  static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 	uh->len = htons(skb->len);
 	uh->check = 0;
 
-	__skb_push(skb, sizeof(*iph));
-	skb_reset_network_header(skb);
-	iph		= ip_hdr(skb);
-	iph->version	= 4;
-	iph->ihl	= sizeof(struct iphdr) >> 2;
-	iph->frag_off	= df;
-	iph->protocol	= IPPROTO_UDP;
-	iph->tos	= ip_tunnel_ecn_encap(tos, old_iph, skb);
-	iph->daddr	= dst;
-	iph->saddr	= fl4.saddr;
-	iph->ttl	= ttl ? : ip4_dst_hoplimit(&rt->dst);
-	tunnel_ip_select_ident(skb, old_iph, &rt->dst);
-
-	nf_reset(skb);
+	if (dst->sa.sa_family == AF_INET) {
+		__skb_push(skb, sizeof(*iph));
+		skb_reset_network_header(skb);
+		iph		= ip_hdr(skb);
+		iph->version	= 4;
+		iph->ihl	= sizeof(struct iphdr) >> 2;
+		iph->frag_off	= df;
+		iph->protocol	= IPPROTO_UDP;
+		iph->tos	= ip_tunnel_ecn_encap(tos, old_iph, skb);
+		iph->daddr	= dst->sin.sin_addr.s_addr;
+		iph->saddr	= fl4.saddr;
+		iph->ttl	= ttl ? : ip4_dst_hoplimit(ndst);
+		tunnel_ip_select_ident(skb, old_iph, ndst);
+	} else {
+#if IS_ENABLED(CONFIG_IPV6)
+		if (!skb_is_gso(skb) && !(ndst->dev->features & NETIF_F_IPV6_CSUM)) {
+			__wsum csum = skb_checksum(skb, 0, skb->len, 0);
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+			uh->check = csum_ipv6_magic(&fl6.saddr, &fl6.daddr, skb->len,
+						    IPPROTO_UDP, csum);
+			if (uh->check == 0)
+				uh->check = CSUM_MANGLED_0;
+		} else {
+			skb->ip_summed = CHECKSUM_PARTIAL;
+			skb->csum_start = skb_transport_header(skb) - skb->head;
+			skb->csum_offset = offsetof(struct udphdr, check);
+			uh->check = ~csum_ipv6_magic(&fl6.saddr, &fl6.daddr,
+						     skb->len, IPPROTO_UDP, 0);
+		}
+
+		__skb_push(skb, sizeof(*ip6h));
+		skb_reset_network_header(skb);
+		ip6h		  = ipv6_hdr(skb);
+		ip6h->version	  = 6;
+		ip6h->priority	  = 0;
+		ip6h->flow_lbl[0] = 0;
+		ip6h->flow_lbl[1] = 0;
+		ip6h->flow_lbl[2] = 0;
+		ip6h->payload_len = htons(skb->len);
+		ip6h->nexthdr     = IPPROTO_UDP;
+		ip6h->hop_limit   = ttl ? : ip6_dst_hoplimit(ndst);
+		ip6h->daddr	  = fl6.daddr;
+		ip6h->saddr	  = fl6.saddr;
+#endif
+	}
 
 	vxlan_set_owner(dev, skb);
 
 	if (handle_offloads(skb))
 		goto drop;
 
-	iptunnel_xmit(skb, dev);
+#if IS_ENABLED(CONFIG_IPV6)
+	if (dst->sa.sa_family == AF_INET6)
+		ip6tunnel_xmit(skb, dev);
+	else
+#endif
+		iptunnel_xmit(skb, dev);
 	return NETDEV_TX_OK;
 
 drop:
@@ -1122,7 +1387,7 @@  static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (f == NULL) {
 		rdst0 = &vxlan->default_dst;
 
-		if (rdst0->remote_ip == htonl(INADDR_ANY) &&
+		if (vxlan_addr_any(&rdst0->remote_ip) &&
 		    (vxlan->flags & VXLAN_F_L2MISS) &&
 		    !is_multicast_ether_addr(eth->h_dest))
 			vxlan_fdb_miss(vxlan, eth->h_dest);
@@ -1200,7 +1465,7 @@  static int vxlan_open(struct net_device *dev)
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	int err;
 
-	if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) {
+	if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
 		err = vxlan_join_group(dev);
 		if (err)
 			return err;
@@ -1234,7 +1499,7 @@  static int vxlan_stop(struct net_device *dev)
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 
-	if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip)))
+	if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip))
 		vxlan_leave_group(dev);
 
 	del_timer_sync(&vxlan->age_timer);
@@ -1284,7 +1549,12 @@  static void vxlan_setup(struct net_device *dev)
 
 	eth_hw_addr_random(dev);
 	ether_setup(dev);
-	dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
+#if IS_ENABLED(CONFIG_IPV6)
+	if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
+		dev->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM;
+	else
+#endif
+		dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
 
 	dev->netdev_ops = &vxlan_netdev_ops;
 	dev->destructor = vxlan_free;
@@ -1321,8 +1591,10 @@  static void vxlan_setup(struct net_device *dev)
 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
 	[IFLA_VXLAN_ID]		= { .type = NLA_U32 },
 	[IFLA_VXLAN_REMOTE]	= { .len = FIELD_SIZEOF(struct iphdr, daddr) },
+	[IFLA_VXLAN_REMOTE6]	= { .len = sizeof(struct in6_addr) },
 	[IFLA_VXLAN_LINK]	= { .type = NLA_U32 },
 	[IFLA_VXLAN_LOCAL]	= { .len = FIELD_SIZEOF(struct iphdr, saddr) },
+	[IFLA_VXLAN_LOCAL6]	= { .len = sizeof(struct in6_addr) },
 	[IFLA_VXLAN_TOS]	= { .type = NLA_U8 },
 	[IFLA_VXLAN_TTL]	= { .type = NLA_U8 },
 	[IFLA_VXLAN_LEARNING]	= { .type = NLA_U8 },
@@ -1402,11 +1674,31 @@  static int vxlan_newlink(struct net *net, struct net_device *dev,
 	}
 	dst->remote_vni = vni;
 
-	if (data[IFLA_VXLAN_REMOTE])
-		dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_REMOTE]);
+	if (data[IFLA_VXLAN_REMOTE]) {
+		dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_REMOTE]);
+		dst->remote_ip.sa.sa_family = AF_INET;
+	} else if (data[IFLA_VXLAN_REMOTE6]) {
+#if IS_ENABLED(CONFIG_IPV6)
+		nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_REMOTE6],
+			   sizeof(struct in6_addr));
+		dst->remote_ip.sa.sa_family = AF_INET6;
+#else
+		return -EPFNOSUPPORT;
+#endif
+	}
 
-	if (data[IFLA_VXLAN_LOCAL])
-		vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
+	if (data[IFLA_VXLAN_LOCAL]) {
+		vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
+		vxlan->saddr.sa.sa_family = AF_INET;
+	} else if (data[IFLA_VXLAN_LOCAL6]) {
+#if IS_ENABLED(CONFIG_IPV6)
+		nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
+			   sizeof(struct in6_addr));
+		vxlan->saddr.sa.sa_family = AF_INET6;
+#else
+		return -EPFNOSUPPORT;
+#endif
+	}
 
 	if (data[IFLA_VXLAN_LINK] &&
 	    (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
@@ -1484,9 +1776,9 @@  static size_t vxlan_get_size(const struct net_device *dev)
 {
 
 	return nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_ID */
-		nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_REMOTE */
+		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_REMOTE{6} */
 		nla_total_size(sizeof(__u32)) +	/* IFLA_VXLAN_LINK */
-		nla_total_size(sizeof(__be32))+	/* IFLA_VXLAN_LOCAL */
+		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
 		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TTL */
 		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_TOS */
 		nla_total_size(sizeof(__u8)) +	/* IFLA_VXLAN_LEARNING */
@@ -1512,14 +1804,34 @@  static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 	if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
 		goto nla_put_failure;
 
-	if (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_REMOTE, dst->remote_ip))
-		goto nla_put_failure;
+	if (!vxlan_addr_any(&dst->remote_ip)) {
+		if (dst->remote_ip.sa.sa_family == AF_INET) {
+			if (nla_put_be32(skb, IFLA_VXLAN_REMOTE, dst->remote_ip.sin.sin_addr.s_addr))
+				goto nla_put_failure;
+		} else {
+#if IS_ENABLED(CONFIG_IPV6)
+			if (nla_put(skb, IFLA_VXLAN_REMOTE6, sizeof(struct in6_addr),
+				    &dst->remote_ip.sin6.sin6_addr))
+				goto nla_put_failure;
+#endif
+		}
+	}
 
 	if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
 		goto nla_put_failure;
 
-	if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr))
-		goto nla_put_failure;
+	if (!vxlan_addr_any(&vxlan->saddr)) {
+		if (vxlan->saddr.sa.sa_family == AF_INET) {
+			if (nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr.sin.sin_addr.s_addr))
+				goto nla_put_failure;
+		} else {
+#if IS_ENABLED(CONFIG_IPV6)
+			if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
+				    &vxlan->saddr.sin6.sin6_addr))
+				goto nla_put_failure;
+#endif
+		}
+	}
 
 	if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
 	    nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
@@ -1558,38 +1870,87 @@  static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
 	.fill_info	= vxlan_fill_info,
 };
 
-static __net_init int vxlan_init_net(struct net *net)
+/* Create UDP socket for encapsulation receive. AF_INET6 socket
+ * could be used for both IPv4 and IPv6 communications.
+ */
+#if IS_ENABLED(CONFIG_IPV6)
+static __net_init int create_sock(struct net *net, struct sock **sk)
+{
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+	struct sockaddr_in6 vxlan_addr = {
+		.sin6_family = AF_INET6,
+		.sin6_port = htons(vxlan_port),
+	};
+	int rc;
+
+	rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &vn->sock);
+	if (rc < 0) {
+		pr_debug("UDP socket create failed\n");
+		return rc;
+	}
+	/* Put in proper namespace */
+	*sk = vn->sock->sk;
+	sk_change_net(*sk, net);
+
+	rc = kernel_bind(vn->sock, (struct sockaddr *)&vxlan_addr,
+			 sizeof(struct sockaddr_in6));
+	if (rc < 0) {
+		pr_debug("bind for UDP socket %pI6:%u (%d)\n",
+			 &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
+		sk_release_kernel(*sk);
+		vn->sock = NULL;
+		return rc;
+	}
+
+	/* At this point, IPv6 module should have been loaded in
+	 * sock_create_kern().
+	 */
+	BUG_ON(!ipv6_mcast_ops);
+	return 0;
+}
+#else
+static __net_init int create_sock(struct net *net, struct sock **sk)
 {
 	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
-	struct sock *sk;
 	struct sockaddr_in vxlan_addr = {
 		.sin_family = AF_INET,
+		.sin_port = htons(vxlan_port),
 		.sin_addr.s_addr = htonl(INADDR_ANY),
 	};
 	int rc;
-	unsigned h;
 
-	/* Create UDP socket for encapsulation receive. */
 	rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vn->sock);
 	if (rc < 0) {
 		pr_debug("UDP socket create failed\n");
 		return rc;
 	}
 	/* Put in proper namespace */
-	sk = vn->sock->sk;
-	sk_change_net(sk, net);
-
-	vxlan_addr.sin_port = htons(vxlan_port);
+	*sk = vn->sock->sk;
+	sk_change_net(*sk, net);
 
-	rc = kernel_bind(vn->sock, (struct sockaddr *) &vxlan_addr,
-			 sizeof(vxlan_addr));
+	rc = kernel_bind(vn->sock, (struct sockaddr *)&vxlan_addr,
+			 sizeof(struct sockaddr_in));
 	if (rc < 0) {
 		pr_debug("bind for UDP socket %pI4:%u (%d)\n",
 			 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
-		sk_release_kernel(sk);
+		sk_release_kernel(*sk);
 		vn->sock = NULL;
 		return rc;
 	}
+	return 0;
+}
+#endif
+
+static __net_init int vxlan_init_net(struct net *net)
+{
+	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
+	struct sock *sk;
+	int rc;
+	unsigned h;
+
+	rc = create_sock(net, &sk);
+	if (rc < 0)
+		return rc;
 
 	/* Disable multicast loopback */
 	inet_sk(sk)->mc_loop = 0;
@@ -1598,6 +1959,9 @@  static __net_init int vxlan_init_net(struct net *net)
 	udp_sk(sk)->encap_type = 1;
 	udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
 	udp_encap_enable();
+#if IS_ENABLED(CONFIG_IPV6)
+	udpv6_encap_enable();
+#endif
 
 	for (h = 0; h < VNI_HASH_SIZE; ++h)
 		INIT_HLIST_HEAD(&vn->vni_list[h]);
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index e316354..92ae9bd 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -310,6 +310,8 @@  enum {
 	IFLA_VXLAN_RSC,
 	IFLA_VXLAN_L2MISS,
 	IFLA_VXLAN_L3MISS,
+	IFLA_VXLAN_REMOTE6,
+	IFLA_VXLAN_LOCAL6,
 	__IFLA_VXLAN_MAX
 };
 #define IFLA_VXLAN_MAX	(__IFLA_VXLAN_MAX - 1)