Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1820 insertions, 0 deletions

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
new file mode 100644
index 000000000..8c458c8f5
--- /dev/null
+++ b/drivers/net/geneve.c
@@ -0,0 +1,1820 @@
+/*
+ * GENEVE: Generic Network Virtualization Encapsulation
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/etherdevice.h>
+#include <linux/hash.h>
+#include <net/dst_metadata.h>
+#include <net/gro_cells.h>
+#include <net/rtnetlink.h>
+#include <net/geneve.h>
+#include <net/protocol.h>
+
+#define GENEVE_NETDEV_VER	"0.6"
+
+#define GENEVE_UDP_PORT		6081
+
+#define GENEVE_N_VID		(1u << 24)
+#define GENEVE_VID_MASK		(GENEVE_N_VID - 1)
+
+#define VNI_HASH_BITS		10
+#define VNI_HASH_SIZE		(1<<VNI_HASH_BITS)
+
+static bool log_ecn_error = true;
+module_param(log_ecn_error, bool, 0644);
+MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+
+#define GENEVE_VER 0
+#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
+#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
+#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
+
+/* per-network namespace private data for this module */
+struct geneve_net {
+	struct list_head	geneve_list;
+	struct list_head	sock_list;
+};
+
+static unsigned int geneve_net_id;
+
+struct geneve_dev_node {
+	struct hlist_node hlist;
+	struct geneve_dev *geneve;
+};
+
+/* Pseudo network device */
+struct geneve_dev {
+	struct geneve_dev_node hlist4;	/* vni hash table for IPv4 socket */
+#if IS_ENABLED(CONFIG_IPV6)
+	struct geneve_dev_node hlist6;	/* vni hash table for IPv6 socket */
+#endif
+	struct net	   *net;	/* netns for packet i/o */
+	struct net_device  *dev;	/* netdev for geneve tunnel */
+	struct ip_tunnel_info info;
+	struct geneve_sock __rcu *sock4;	/* IPv4 socket used for geneve tunnel */
+#if IS_ENABLED(CONFIG_IPV6)
+	struct geneve_sock __rcu *sock6;	/* IPv6 socket used for geneve tunnel */
+#endif
+	struct list_head   next;	/* geneve's per namespace list */
+	struct gro_cells   gro_cells;
+	bool		   collect_md;
+	bool		   use_udp6_rx_checksums;
+};
+
+struct geneve_sock {
+	bool			collect_md;
+	struct list_head	list;
+	struct socket		*sock;
+	struct rcu_head		rcu;
+	int			refcnt;
+	struct hlist_head	vni_list[VNI_HASH_SIZE];
+};
+
+static inline __u32 geneve_net_vni_hash(u8 vni[3])
+{
+	__u32 vnid;
+
+	vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
+	return hash_32(vnid, VNI_HASH_BITS);
+}
+
+static __be64 vni_to_tunnel_id(const __u8 *vni)
+{
+#ifdef __BIG_ENDIAN
+	return (vni[0] << 16) | (vni[1] << 8) | vni[2];
+#else
+	return (__force __be64)(((__force u64)vni[0] << 40) |
+				((__force u64)vni[1] << 48) |
+				((__force u64)vni[2] << 56));
+#endif
+}
+
+/* Convert 64 bit tunnel ID to 24 bit VNI. */
+static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
+{
+#ifdef __BIG_ENDIAN
+	vni[0] = (__force __u8)(tun_id >> 16);
+	vni[1] = (__force __u8)(tun_id >> 8);
+	vni[2] = (__force __u8)tun_id;
+#else
+	vni[0] = (__force __u8)((__force u64)tun_id >> 40);
+	vni[1] = (__force __u8)((__force u64)tun_id >> 48);
+	vni[2] = (__force __u8)((__force u64)tun_id >> 56);
+#endif
+}
+
+static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
+{
+	return !memcmp(vni, &tun_id[5], 3);
+}
+
+static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
+{
+	return gs->sock->sk->sk_family;
+}
+
+static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
+					__be32 addr, u8 vni[])
+{
+	struct hlist_head *vni_list_head;
+	struct geneve_dev_node *node;
+	__u32 hash;
+
+	/* Find the device for this VNI */
+	hash = geneve_net_vni_hash(vni);
+	vni_list_head = &gs->vni_list[hash];
+	hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
+		if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
+		    addr == node->geneve->info.key.u.ipv4.dst)
+			return node->geneve;
+	}
+	return NULL;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
+					 struct in6_addr addr6, u8 vni[])
+{
+	struct hlist_head *vni_list_head;
+	struct geneve_dev_node *node;
+	__u32 hash;
+
+	/* Find the device for this VNI */
+	hash = geneve_net_vni_hash(vni);
+	vni_list_head = &gs->vni_list[hash];
+	hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
+		if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
+		    ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
+			return node->geneve;
+	}
+	return NULL;
+}
+#endif
+
+static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
+{
+	return (struct genevehdr *)(udp_hdr(skb) + 1);
+}
+
+static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
+					    struct sk_buff *skb)
+{
+	static u8 zero_vni[3];
+	u8 *vni;
+
+	if (geneve_get_sk_family(gs) == AF_INET) {
+		struct iphdr *iph;
+		__be32 addr;
+
+		iph = ip_hdr(skb); /* outer IP header... */
+
+		if (gs->collect_md) {
+			vni = zero_vni;
+			addr = 0;
+		} else {
+			vni = geneve_hdr(skb)->vni;
+			addr = iph->saddr;
+		}
+
+		return geneve_lookup(gs, addr, vni);
+#if IS_ENABLED(CONFIG_IPV6)
+	} else if (geneve_get_sk_family(gs) == AF_INET6) {
+		static struct in6_addr zero_addr6;
+		struct ipv6hdr *ip6h;
+		struct in6_addr addr6;
+
+		ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
+
+		if (gs->collect_md) {
+			vni = zero_vni;
+			addr6 = zero_addr6;
+		} else {
+			vni = geneve_hdr(skb)->vni;
+			addr6 = ip6h->saddr;
+		}
+
+		return geneve6_lookup(gs, addr6, vni);
+#endif
+	}
+	return NULL;
+}
+
+/* geneve receive/decap routine */
+static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
+		      struct sk_buff *skb)
+{
+	struct genevehdr *gnvh = geneve_hdr(skb);
+	struct metadata_dst *tun_dst = NULL;
+	struct pcpu_sw_netstats *stats;
+	unsigned int len;
+	int err = 0;
+	void *oiph;
+
+	if (ip_tunnel_collect_metadata() || gs->collect_md) {
+		__be16 flags;
+
+		flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
+			(gnvh->critical ? TUNNEL_CRIT_OPT : 0);
+
+		tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
+					 vni_to_tunnel_id(gnvh->vni),
+					 gnvh->opt_len * 4);
+		if (!tun_dst) {
+			geneve->dev->stats.rx_dropped++;
+			goto drop;
+		}
+		/* Update tunnel dst according to Geneve options. */
+		ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
+					gnvh->options, gnvh->opt_len * 4,
+					TUNNEL_GENEVE_OPT);
+	} else {
+		/* Drop packets w/ critical options,
+		 * since we don't support any...
+		 */
+		if (gnvh->critical) {
+			geneve->dev->stats.rx_frame_errors++;
+			geneve->dev->stats.rx_errors++;
+			goto drop;
+		}
+	}
+
+	skb_reset_mac_header(skb);
+	skb->protocol = eth_type_trans(skb, geneve->dev);
+	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+
+	if (tun_dst)
+		skb_dst_set(skb, &tun_dst->dst);
+
+	/* Ignore packet loops (and multicast echo) */
+	if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
+		geneve->dev->stats.rx_errors++;
+		goto drop;
+	}
+
+	oiph = skb_network_header(skb);
+	skb_reset_network_header(skb);
+
+	if (geneve_get_sk_family(gs) == AF_INET)
+		err = IP_ECN_decapsulate(oiph, skb);
+#if IS_ENABLED(CONFIG_IPV6)
+	else
+		err = IP6_ECN_decapsulate(oiph, skb);
+#endif
+
+	if (unlikely(err)) {
+		if (log_ecn_error) {
+			if (geneve_get_sk_family(gs) == AF_INET)
+				net_info_ratelimited("non-ECT from %pI4 "
+						     "with TOS=%#x\n",
+						     &((struct iphdr *)oiph)->saddr,
+						     ((struct iphdr *)oiph)->tos);
+#if IS_ENABLED(CONFIG_IPV6)
+			else
+				net_info_ratelimited("non-ECT from %pI6\n",
+						     &((struct ipv6hdr *)oiph)->saddr);
+#endif
+		}
+		if (err > 1) {
+			++geneve->dev->stats.rx_frame_errors;
+			++geneve->dev->stats.rx_errors;
+			goto drop;
+		}
+	}
+
+	len = skb->len;
+	err = gro_cells_receive(&geneve->gro_cells, skb);
+	if (likely(err == NET_RX_SUCCESS)) {
+		stats = this_cpu_ptr(geneve->dev->tstats);
+		u64_stats_update_begin(&stats->syncp);
+		stats->rx_packets++;
+		stats->rx_bytes += len;
+		u64_stats_update_end(&stats->syncp);
+	}
+	return;
+drop:
+	/* Consume bad packet */
+	kfree_skb(skb);
+}
+
+/* Setup stats when device is created */
+static int geneve_init(struct net_device *dev)
+{
+	struct geneve_dev *geneve = netdev_priv(dev);
+	int err;
+
+	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+	if (!dev->tstats)
+		return -ENOMEM;
+
+	err = gro_cells_init(&geneve->gro_cells, dev);
+	if (err) {
+		free_percpu(dev->tstats);
+		return err;
+	}
+
+	err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
+	if (err) {
+		free_percpu(dev->tstats);
+		gro_cells_destroy(&geneve->gro_cells);
+		return err;
+	}
+	return 0;
+}
+
+static void geneve_uninit(struct net_device *dev)
+{
+	struct geneve_dev *geneve = netdev_priv(dev);
+
+	dst_cache_destroy(&geneve->info.dst_cache);
+	gro_cells_destroy(&geneve->gro_cells);
+	free_percpu(dev->tstats);
+}
+
+/* Callback from net/ipv4/udp.c to receive packets */
+static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
+{
+	struct genevehdr *geneveh;
+	struct geneve_dev *geneve;
+	struct geneve_sock *gs;
+	int opts_len;
+
+	/* Need UDP and Geneve header to be present */
+	if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
+		goto drop;
+
+	/* Return packets with reserved bits set */
+	geneveh = geneve_hdr(skb);
+	if (unlikely(geneveh->ver != GENEVE_VER))
+		goto drop;
+
+	if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
+		goto drop;
+
+	gs = rcu_dereference_sk_user_data(sk);
+	if (!gs)
+		goto drop;
+
+	geneve = geneve_lookup_skb(gs, skb);
+	if (!geneve)
+		goto drop;
+
+	opts_len = geneveh->opt_len * 4;
+	if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
+				 htons(ETH_P_TEB),
+				 !net_eq(geneve->net, dev_net(geneve->dev)))) {
+		geneve->dev->stats.rx_dropped++;
+		goto drop;
+	}
+
+	geneve_rx(geneve, gs, skb);
+	return 0;
+
+drop:
+	/* Consume bad packet */
+	kfree_skb(skb);
+	return 0;
+}
+
+static struct socket *geneve_create_sock(struct net *net, bool ipv6,
+					 __be16 port, bool ipv6_rx_csum)
+{
+	struct socket *sock;
+	struct udp_port_cfg udp_conf;
+	int err;
+
+	memset(&udp_conf, 0, sizeof(udp_conf));
+
+	if (ipv6) {
+		udp_conf.family = AF_INET6;
+		udp_conf.ipv6_v6only = 1;
+		udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
+	} else {
+		udp_conf.family = AF_INET;
+		udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
+	}
+
+	udp_conf.local_udp_port = port;
+
+	/* Open UDP socket */
+	err = udp_sock_create(net, &udp_conf, &sock);
+	if (err < 0)
+		return ERR_PTR(err);
+
+	return sock;
+}
+
+static int geneve_hlen(struct genevehdr *gh)
+{
+	return sizeof(*gh) + gh->opt_len * 4;
+}
+
+static struct sk_buff *geneve_gro_receive(struct sock *sk,
+					  struct list_head *head,
+					  struct sk_buff *skb)
+{
+	struct sk_buff *pp = NULL;
+	struct sk_buff *p;
+	struct genevehdr *gh, *gh2;
+	unsigned int hlen, gh_len, off_gnv;
+	const struct packet_offload *ptype;
+	__be16 type;
+	int flush = 1;
+
+	off_gnv = skb_gro_offset(skb);
+	hlen = off_gnv + sizeof(*gh);
+	gh = skb_gro_header_fast(skb, off_gnv);
+	if (skb_gro_header_hard(skb, hlen)) {
+		gh = skb_gro_header_slow(skb, hlen, off_gnv);
+		if (unlikely(!gh))
+			goto out;
+	}
+
+	if (gh->ver != GENEVE_VER || gh->oam)
+		goto out;
+	gh_len = geneve_hlen(gh);
+
+	hlen = off_gnv + gh_len;
+	if (skb_gro_header_hard(skb, hlen)) {
+		gh = skb_gro_header_slow(skb, hlen, off_gnv);
+		if (unlikely(!gh))
+			goto out;
+	}
+
+	list_for_each_entry(p, head, list) {
+		if (!NAPI_GRO_CB(p)->same_flow)
+			continue;
+
+		gh2 = (struct genevehdr *)(p->data + off_gnv);
+		if (gh->opt_len != gh2->opt_len ||
+		    memcmp(gh, gh2, gh_len)) {
+			NAPI_GRO_CB(p)->same_flow = 0;
+			continue;
+		}
+	}
+
+	type = gh->proto_type;
+
+	rcu_read_lock();
+	ptype = gro_find_receive_by_type(type);
+	if (!ptype)
+		goto out_unlock;
+
+	skb_gro_pull(skb, gh_len);
+	skb_gro_postpull_rcsum(skb, gh, gh_len);
+	pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
+	flush = 0;
+
+out_unlock:
+	rcu_read_unlock();
+out:
+	skb_gro_flush_final(skb, pp, flush);
+
+	return pp;
+}
+
+static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
+			       int nhoff)
+{
+	struct genevehdr *gh;
+	struct packet_offload *ptype;
+	__be16 type;
+	int gh_len;
+	int err = -ENOSYS;
+
+	gh = (struct genevehdr *)(skb->data + nhoff);
+	gh_len = geneve_hlen(gh);
+	type = gh->proto_type;
+
+	rcu_read_lock();
+	ptype = gro_find_complete_by_type(type);
+	if (ptype)
+		err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
+
+	rcu_read_unlock();
+
+	skb_set_inner_mac_header(skb, nhoff + gh_len);
+
+	return err;
+}
+
+/* Create new listen socket if needed */
+static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
+						bool ipv6, bool ipv6_rx_csum)
+{
+	struct geneve_net *gn = net_generic(net, geneve_net_id);
+	struct geneve_sock *gs;
+	struct socket *sock;
+	struct udp_tunnel_sock_cfg tunnel_cfg;
+	int h;
+
+	gs = kzalloc(sizeof(*gs), GFP_KERNEL);
+	if (!gs)
+		return ERR_PTR(-ENOMEM);
+
+	sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
+	if (IS_ERR(sock)) {
+		kfree(gs);
+		return ERR_CAST(sock);
+	}
+
+	gs->sock = sock;
+	gs->refcnt = 1;
+	for (h = 0; h < VNI_HASH_SIZE; ++h)
+		INIT_HLIST_HEAD(&gs->vni_list[h]);
+
+	/* Initialize the geneve udp offloads structure */
+	udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
+
+	/* Mark socket as an encapsulation socket */
+	memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
+	tunnel_cfg.sk_user_data = gs;
+	tunnel_cfg.encap_type = 1;
+	tunnel_cfg.gro_receive = geneve_gro_receive;
+	tunnel_cfg.gro_complete = geneve_gro_complete;
+	tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
+	tunnel_cfg.encap_destroy = NULL;
+	setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
+	list_add(&gs->list, &gn->sock_list);
+	return gs;
+}
+
+static void __geneve_sock_release(struct geneve_sock *gs)
+{
+	if (!gs || --gs->refcnt)
+		return;
+
+	list_del(&gs->list);
+	udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
+	udp_tunnel_sock_release(gs->sock);
+	kfree_rcu(gs, rcu);
+}
+
+static void geneve_sock_release(struct geneve_dev *geneve)
+{
+	struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
+#if IS_ENABLED(CONFIG_IPV6)
+	struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
+
+	rcu_assign_pointer(geneve->sock6, NULL);
+#endif
+
+	rcu_assign_pointer(geneve->sock4, NULL);
+	synchronize_net();
+
+	__geneve_sock_release(gs4);
+#if IS_ENABLED(CONFIG_IPV6)
+	__geneve_sock_release(gs6);
+#endif
+}
+
+static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
+					    sa_family_t family,
+					    __be16 dst_port)
+{
+	struct geneve_sock *gs;
+
+	list_for_each_entry(gs, &gn->sock_list, list) {
+		if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
+		    geneve_get_sk_family(gs) == family) {
+			return gs;
+		}
+	}
+	return NULL;
+}
+
+static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
+{
+	struct net *net = geneve->net;
+	struct geneve_net *gn = net_generic(net, geneve_net_id);
+	struct geneve_dev_node *node;
+	struct geneve_sock *gs;
+	__u8 vni[3];
+	__u32 hash;
+
+	gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
+	if (gs) {
+		gs->refcnt++;
+		goto out;
+	}
+
+	gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
+				  geneve->use_udp6_rx_checksums);
+	if (IS_ERR(gs))
+		return PTR_ERR(gs);
+
+out:
+	gs->collect_md = geneve->collect_md;
+#if IS_ENABLED(CONFIG_IPV6)
+	if (ipv6) {
+		rcu_assign_pointer(geneve->sock6, gs);
+		node = &geneve->hlist6;
+	} else
+#endif
+	{
+		rcu_assign_pointer(geneve->sock4, gs);
+		node = &geneve->hlist4;
+	}
+	node->geneve = geneve;
+
+	tunnel_id_to_vni(geneve->info.key.tun_id, vni);
+	hash = geneve_net_vni_hash(vni);
+	hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
+	return 0;
+}
+
+static int geneve_open(struct net_device *dev)
+{
+	struct geneve_dev *geneve = netdev_priv(dev);
+	bool metadata = geneve->collect_md;
+	bool ipv4, ipv6;
+	int ret = 0;
+
+	ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
+	ipv4 = !ipv6 || metadata;
+#if IS_ENABLED(CONFIG_IPV6)
+	if (ipv6) {
+		ret = geneve_sock_add(geneve, true);
+		if (ret < 0 && ret != -EAFNOSUPPORT)
+			ipv4 = false;
+	}
+#endif
+	if (ipv4)
+		ret = geneve_sock_add(geneve, false);
+	if (ret < 0)
+		geneve_sock_release(geneve);
+
+	return ret;
+}
+
+static int geneve_stop(struct net_device *dev)
+{
+	struct geneve_dev *geneve = netdev_priv(dev);
+
+	hlist_del_init_rcu(&geneve->hlist4.hlist);
+#if IS_ENABLED(CONFIG_IPV6)
+	hlist_del_init_rcu(&geneve->hlist6.hlist);
+#endif
+	geneve_sock_release(geneve);
+	return 0;
+}
+
+static void geneve_build_header(struct genevehdr *geneveh,
+				const struct ip_tunnel_info *info)
+{
+	geneveh->ver = GENEVE_VER;
+	geneveh->opt_len = info->options_len / 4;
+	geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
+	geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
+	geneveh->rsvd1 = 0;
+	tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
+	geneveh->proto_type = htons(ETH_P_TEB);
+	geneveh->rsvd2 = 0;
+
+	if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
+		ip_tunnel_info_opts_get(geneveh->options, info);
+}
+
+static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
+			    const struct ip_tunnel_info *info,
+			    bool xnet, int ip_hdr_len)
+{
+	bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
+	struct genevehdr *gnvh;
+	int min_headroom;
+	int err;
+
+	skb_reset_mac_header(skb);
+	skb_scrub_packet(skb, xnet);
+
+	min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
+		       GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
+	err = skb_cow_head(skb, min_headroom);
+	if (unlikely(err))
+		goto free_dst;
+
+	err = udp_tunnel_handle_offloads(skb, udp_sum);
+	if (err)
+		goto free_dst;
+
+	gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
+	geneve_build_header(gnvh, info);
+	skb_set_inner_protocol(skb, htons(ETH_P_TEB));
+	return 0;
+
+free_dst:
+	dst_release(dst);
+	return err;
+}
+
+static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
+				       struct net_device *dev,
+				       struct geneve_sock *gs4,
+				       struct flowi4 *fl4,
+				       const struct ip_tunnel_info *info,
+				       __be16 dport, __be16 sport)
+{
+	bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
+	struct geneve_dev *geneve = netdev_priv(dev);
+	struct dst_cache *dst_cache;
+	struct rtable *rt = NULL;
+	__u8 tos;
+
+	if (!gs4)
+		return ERR_PTR(-EIO);
+
+	memset(fl4, 0, sizeof(*fl4));
+	fl4->flowi4_mark = skb->mark;
+	fl4->flowi4_proto = IPPROTO_UDP;
+	fl4->daddr = info->key.u.ipv4.dst;
+	fl4->saddr = info->key.u.ipv4.src;
+	fl4->fl4_dport = dport;
+	fl4->fl4_sport = sport;
+
+	tos = info->key.tos;
+	if ((tos == 1) && !geneve->collect_md) {
+		tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
+		use_cache = false;
+	}
+	fl4->flowi4_tos = RT_TOS(tos);
+
+	dst_cache = (struct dst_cache *)&info->dst_cache;
+	if (use_cache) {
+		rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
+		if (rt)
+			return rt;
+	}
+	rt = ip_route_output_key(geneve->net, fl4);
+	if (IS_ERR(rt)) {
+		netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
+		return ERR_PTR(-ENETUNREACH);
+	}
+	if (rt->dst.dev == dev) { /* is this necessary? */
+		netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
+		ip_rt_put(rt);
+		return ERR_PTR(-ELOOP);
+	}
+	if (use_cache)
+		dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
+	return rt;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
+					   struct net_device *dev,
+					   struct geneve_sock *gs6,
+					   struct flowi6 *fl6,
+					   const struct ip_tunnel_info *info,
+					   __be16 dport, __be16 sport)
+{
+	bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
+	struct geneve_dev *geneve = netdev_priv(dev);
+	struct dst_entry *dst = NULL;
+	struct dst_cache *dst_cache;
+	__u8 prio;
+
+	if (!gs6)
+		return ERR_PTR(-EIO);
+
+	memset(fl6, 0, sizeof(*fl6));
+	fl6->flowi6_mark = skb->mark;
+	fl6->flowi6_proto = IPPROTO_UDP;
+	fl6->daddr = info->key.u.ipv6.dst;
+	fl6->saddr = info->key.u.ipv6.src;
+	fl6->fl6_dport = dport;
+	fl6->fl6_sport = sport;
+
+	prio = info->key.tos;
+	if ((prio == 1) && !geneve->collect_md) {
+		prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
+		use_cache = false;
+	}
+
+	fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
+					   info->key.label);
+	dst_cache = (struct dst_cache *)&info->dst_cache;
+	if (use_cache) {
+		dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
+		if (dst)
+			return dst;
+	}
+	dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
+					      NULL);
+	if (IS_ERR(dst)) {
+		netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
+		return ERR_PTR(-ENETUNREACH);
+	}
+	if (dst->dev == dev) { /* is this necessary? */
+		netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
+		dst_release(dst);
+		return ERR_PTR(-ELOOP);
+	}
+
+	if (use_cache)
+		dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
+	return dst;
+}
+#endif
+
+static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
+			   struct geneve_dev *geneve,
+			   const struct ip_tunnel_info *info)
+{
+	bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
+	struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
+	const struct ip_tunnel_key *key = &info->key;
+	struct rtable *rt;
+	struct flowi4 fl4;
+	__u8 tos, ttl;
+	__be16 sport;
+	__be16 df;
+	int err;
+
+	if (!pskb_inet_may_pull(skb))
+		return -EINVAL;
+
+	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
+	rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
+			      geneve->info.key.tp_dst, sport);
+	if (IS_ERR(rt))
+		return PTR_ERR(rt);
+
+	skb_tunnel_check_pmtu(skb, &rt->dst,
+			      GENEVE_IPV4_HLEN + info->options_len);
+
+	if (geneve->collect_md) {
+		tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
+		ttl = key->ttl;
+	} else {
+		tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
+		ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
+	}
+	df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
+
+	err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
+	if (unlikely(err))
+		return err;
+
+	udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
+			    tos, ttl, df, sport, geneve->info.key.tp_dst,
+			    !net_eq(geneve->net, dev_net(geneve->dev)),
+			    !(info->key.tun_flags & TUNNEL_CSUM));
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
+			    struct geneve_dev *geneve,
+			    const struct ip_tunnel_info *info)
+{
+	bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
+	struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
+	const struct ip_tunnel_key *key = &info->key;
+	struct dst_entry *dst = NULL;
+	struct flowi6 fl6;
+	__u8 prio, ttl;
+	__be16 sport;
+	int err;
+
+	if (!pskb_inet_may_pull(skb))
+		return -EINVAL;
+
+	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
+	dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
+				geneve->info.key.tp_dst, sport);
+	if (IS_ERR(dst))
+		return PTR_ERR(dst);
+
+	skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
+
+	if (geneve->collect_md) {
+		prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
+		ttl = key->ttl;
+	} else {
+		prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
+					   ip_hdr(skb), skb);
+		ttl = key->ttl ? : ip6_dst_hoplimit(dst);
+	}
+	err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
+	if (unlikely(err))
+		return err;
+
+	udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
+			     &fl6.saddr, &fl6.daddr, prio, ttl,
+			     info->key.label, sport, geneve->info.key.tp_dst,
+			     !(info->key.tun_flags & TUNNEL_CSUM));
+	return 0;
+}
+#endif
+
+static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct geneve_dev *geneve = netdev_priv(dev);
+	struct ip_tunnel_info *info = NULL;
+	int err;
+
+	if (geneve->collect_md) {
+		info = skb_tunnel_info(skb);
+		if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
+			netdev_dbg(dev, "no tunnel metadata\n");
+			dev_kfree_skb(skb);
+			dev->stats.tx_dropped++;
+			return NETDEV_TX_OK;
+		}
+	} else {
+		info = &geneve->info;
+	}
+
+	rcu_read_lock();
+#if IS_ENABLED(CONFIG_IPV6)
+	if (info->mode & IP_TUNNEL_INFO_IPV6)
+		err = geneve6_xmit_skb(skb, dev, geneve, info);
+	else
+#endif
+		err = geneve_xmit_skb(skb, dev, geneve, info);
+	rcu_read_unlock();
+
+	if (likely(!err))
+		return NETDEV_TX_OK;
+
+	dev_kfree_skb(skb);
+
+	if (err == -ELOOP)
+		dev->stats.collisions++;
+	else if (err == -ENETUNREACH)
+		dev->stats.tx_carrier_errors++;
+
+	dev->stats.tx_errors++;
+	return NETDEV_TX_OK;
+}
+
+static int geneve_change_mtu(struct net_device *dev, int new_mtu)
+{
+	if (new_mtu > dev->max_mtu)
+		new_mtu = dev->max_mtu;
+	else if (new_mtu < dev->min_mtu)
+		new_mtu = dev->min_mtu;
+
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
+{
+	struct ip_tunnel_info *info = skb_tunnel_info(skb);
+	struct geneve_dev *geneve = netdev_priv(dev);
+	__be16 sport;
+
+	if (ip_tunnel_info_af(info) == AF_INET) {
+		struct rtable *rt;
+		struct flowi4 fl4;
+
+		struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
+		sport = udp_flow_src_port(geneve->net, skb,
+					  1, USHRT_MAX, true);
+
+		rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
+				      geneve->info.key.tp_dst, sport);
+		if (IS_ERR(rt))
+			return PTR_ERR(rt);
+
+		ip_rt_put(rt);
+		info->key.u.ipv4.src = fl4.saddr;
+#if IS_ENABLED(CONFIG_IPV6)
+	} else if (ip_tunnel_info_af(info) == AF_INET6) {
+		struct dst_entry *dst;
+		struct flowi6 fl6;
+
+		struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
+		sport = udp_flow_src_port(geneve->net, skb,
+					  1, USHRT_MAX, true);
+
+		dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
+					geneve->info.key.tp_dst, sport);
+		if (IS_ERR(dst))
+			return PTR_ERR(dst);
+
+		dst_release(dst);
+		info->key.u.ipv6.src = fl6.saddr;
+#endif
+	} else {
+		return -EINVAL;
+	}
+
+	info->key.tp_src = sport;
+	info->key.tp_dst = geneve->info.key.tp_dst;
+	return 0;
+}
+
+static const struct net_device_ops geneve_netdev_ops = {
+	.ndo_init		= geneve_init,
+	.ndo_uninit		= geneve_uninit,
+	.ndo_open		= geneve_open,
+	.ndo_stop		= geneve_stop,
+	.ndo_start_xmit		= geneve_xmit,
+	.ndo_get_stats64	= ip_tunnel_get_stats64,
+	.ndo_change_mtu		= geneve_change_mtu,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_fill_metadata_dst	= geneve_fill_metadata_dst,
+};
+
+static void geneve_get_drvinfo(struct net_device *dev,
+			       struct ethtool_drvinfo *drvinfo)
+{
+	strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
+	strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
+}
+
+static const struct ethtool_ops geneve_ethtool_ops = {
+	.get_drvinfo	= geneve_get_drvinfo,
+	.get_link	= ethtool_op_get_link,
+};
+
+/* Info for udev, that this is a virtual tunnel endpoint */
+static struct device_type geneve_type = {
+	.name = "geneve",
+};
+
+/* Calls the ndo_udp_tunnel_add of the caller in order to
+ * supply the listening GENEVE udp ports. Callers are expected
+ * to implement the ndo_udp_tunnel_add.
+ */
+static void geneve_offload_rx_ports(struct net_device *dev, bool push)
+{
+	struct net *net = dev_net(dev);
+	struct geneve_net *gn = net_generic(net, geneve_net_id);
+	struct geneve_sock *gs;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(gs, &gn->sock_list, list) {
+		if (push) {
+			udp_tunnel_push_rx_port(dev, gs->sock,
+						UDP_TUNNEL_TYPE_GENEVE);
+		} else {
+			udp_tunnel_drop_rx_port(dev, gs->sock,
+						UDP_TUNNEL_TYPE_GENEVE);
+		}
+	}
+	rcu_read_unlock();
+}
+
+/* Initialize the device structure. */
+static void geneve_setup(struct net_device *dev)
+{
+	ether_setup(dev);
+
+	dev->netdev_ops = &geneve_netdev_ops;
+	dev->ethtool_ops = &geneve_ethtool_ops;
+	dev->needs_free_netdev = true;
+
+	SET_NETDEV_DEVTYPE(dev, &geneve_type);
+
+	dev->features    |= NETIF_F_LLTX;
+	dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
+	dev->features    |= NETIF_F_RXCSUM;
+	dev->features    |= NETIF_F_GSO_SOFTWARE;
+
+	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
+	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+
+	/* MTU range: 68 - (something less than 65535) */
+	dev->min_mtu = ETH_MIN_MTU;
+	/* The max_mtu calculation does not take account of GENEVE
+	 * options, to avoid excluding potentially valid
+	 * configurations. This will be further reduced by IPvX hdr size.
+	 */
+	dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
+
+	netif_keep_dst(dev);
+	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
+	eth_hw_addr_random(dev);
+}
+
+static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
+	[IFLA_GENEVE_ID]		= { .type = NLA_U32 },
+	[IFLA_GENEVE_REMOTE]		= { .len = FIELD_SIZEOF(struct iphdr, daddr) },
+	[IFLA_GENEVE_REMOTE6]		= { .len = sizeof(struct in6_addr) },
+	[IFLA_GENEVE_TTL]		= { .type = NLA_U8 },
+	[IFLA_GENEVE_TOS]		= { .type = NLA_U8 },
+	[IFLA_GENEVE_LABEL]		= { .type = NLA_U32 },
+	[IFLA_GENEVE_PORT]		= { .type = NLA_U16 },
+	[IFLA_GENEVE_COLLECT_METADATA]	= { .type = NLA_FLAG },
+	[IFLA_GENEVE_UDP_CSUM]		= { .type = NLA_U8 },
+	[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]	= { .type = NLA_U8 },
+	[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]	= { .type = NLA_U8 },
+};
+
+static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
+			   struct netlink_ext_ack *extack)
+{
+	if (tb[IFLA_ADDRESS]) {
+		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
+					    "Provided link layer address is not Ethernet");
+			return -EINVAL;
+		}
+
+		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
+			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
+					    "Provided Ethernet address is not unicast");
+			return -EADDRNOTAVAIL;
+		}
+	}
+
+	if (!data) {
+		NL_SET_ERR_MSG(extack,
+			       "Not enough attributes provided to perform the operation");
+		return -EINVAL;
+	}
+
+	if (data[IFLA_GENEVE_ID]) {
+		__u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
+
+		if (vni >= GENEVE_N_VID) {
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
+					    "Geneve ID must be lower than 16777216");
+			return -ERANGE;
+		}
+	}
+
+	return 0;
+}
+
+static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
+					  const struct ip_tunnel_info *info,
+					  bool *tun_on_same_port,
+					  bool *tun_collect_md)
+{
+	struct geneve_dev *geneve, *t = NULL;
+
+	*tun_on_same_port = false;
+	*tun_collect_md = false;
+	list_for_each_entry(geneve, &gn->geneve_list, next) {
+		if (info->key.tp_dst == geneve->info.key.tp_dst) {
+			*tun_collect_md = geneve->collect_md;
+			*tun_on_same_port = true;
+		}
+		if (info->key.tun_id == geneve->info.key.tun_id &&
+		    info->key.tp_dst == geneve->info.key.tp_dst &&
+		    !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
+			t = geneve;
+	}
+	return t;
+}
+
+static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
+{
+	return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
+		 info->key.ttl || info->key.label || info->key.tp_src ||
+		 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
+}
+
+static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
+				  struct ip_tunnel_info *b)
+{
+	if (ip_tunnel_info_af(a) == AF_INET)
+		return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
+	else
+		return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
+}
+
+static int geneve_configure(struct net *net, struct net_device *dev,
+			    struct netlink_ext_ack *extack,
+			    const struct ip_tunnel_info *info,
+			    bool metadata, bool ipv6_rx_csum)
+{
+	struct geneve_net *gn = net_generic(net, geneve_net_id);
+	struct geneve_dev *t, *geneve = netdev_priv(dev);
+	bool tun_collect_md, tun_on_same_port;
+	int err, encap_len;
+
+	if (metadata && !is_tnl_info_zero(info)) {
+		NL_SET_ERR_MSG(extack,
+			       "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
+		return -EINVAL;
+	}
+
+	geneve->net = net;
+	geneve->dev = dev;
+
+	t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
+	if (t)
+		return -EBUSY;
+
+	/* make enough headroom for basic scenario */
+	encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
+	if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
+		encap_len += sizeof(struct iphdr);
+		dev->max_mtu -= sizeof(struct iphdr);
+	} else {
+		encap_len += sizeof(struct ipv6hdr);
+		dev->max_mtu -= sizeof(struct ipv6hdr);
+	}
+	dev->needed_headroom = encap_len + ETH_HLEN;
+
+	if (metadata) {
+		if (tun_on_same_port) {
+			NL_SET_ERR_MSG(extack,
+				       "There can be only one externally controlled device on a destination port");
+			return -EPERM;
+		}
+	} else {
+		if (tun_collect_md) {
+			NL_SET_ERR_MSG(extack,
+				       "There already exists an externally controlled device on this destination port");
+			return -EPERM;
+		}
+	}
+
+	dst_cache_reset(&geneve->info.dst_cache);
+	geneve->info = *info;
+	geneve->collect_md = metadata;
+	geneve->use_udp6_rx_checksums = ipv6_rx_csum;
+
+	err = register_netdevice(dev);
+	if (err)
+		return err;
+
+	list_add(&geneve->next, &gn->geneve_list);
+	return 0;
+}
+
+static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
+{
+	memset(info, 0, sizeof(*info));
+	info->key.tp_dst = htons(dst_port);
+}
+
+static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
+			  struct netlink_ext_ack *extack,
+			  struct ip_tunnel_info *info, bool *metadata,
+			  bool *use_udp6_rx_checksums, bool changelink)
+{
+	int attrtype;
+
+	if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
+		NL_SET_ERR_MSG(extack,
+			       "Cannot specify both IPv4 and IPv6 Remote addresses");
+		return -EINVAL;
+	}
+
+	if (data[IFLA_GENEVE_REMOTE]) {
+		if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
+			attrtype = IFLA_GENEVE_REMOTE;
+			goto change_notsup;
+		}
+
+		info->key.u.ipv4.dst =
+			nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
+
+		if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
+					    "Remote IPv4 address cannot be Multicast");
+			return -EINVAL;
+		}
+	}
+
+	if (data[IFLA_GENEVE_REMOTE6]) {
+#if IS_ENABLED(CONFIG_IPV6)
+		if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
+			attrtype = IFLA_GENEVE_REMOTE6;
+			goto change_notsup;
+		}
+
+		info->mode = IP_TUNNEL_INFO_IPV6;
+		info->key.u.ipv6.dst =
+			nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
+
+		if (ipv6_addr_type(&info->key.u.ipv6.dst) &
+		    IPV6_ADDR_LINKLOCAL) {
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
+					    "Remote IPv6 address cannot be link-local");
+			return -EINVAL;
+		}
+		if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
+					    "Remote IPv6 address cannot be Multicast");
+			return -EINVAL;
+		}
+		info->key.tun_flags |= TUNNEL_CSUM;
+		*use_udp6_rx_checksums = true;
+#else
+		NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
+				    "IPv6 support not enabled in the kernel");
+		return -EPFNOSUPPORT;
+#endif
+	}
+
+	if (data[IFLA_GENEVE_ID]) {
+		__u32 vni;
+		__u8 tvni[3];
+		__be64 tunid;
+
+		vni = nla_get_u32(data[IFLA_GENEVE_ID]);
+		tvni[0] = (vni & 0x00ff0000) >> 16;
+		tvni[1] = (vni & 0x0000ff00) >> 8;
+		tvni[2] =  vni & 0x000000ff;
+
+		tunid = vni_to_tunnel_id(tvni);
+		if (changelink && (tunid != info->key.tun_id)) {
+			attrtype = IFLA_GENEVE_ID;
+			goto change_notsup;
+		}
+		info->key.tun_id = tunid;
+	}
+
+	if (data[IFLA_GENEVE_TTL])
+		info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
+
+	if (data[IFLA_GENEVE_TOS])
+		info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
+
+	if (data[IFLA_GENEVE_LABEL]) {
+		info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
+				  IPV6_FLOWLABEL_MASK;
+		if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
+					    "Label attribute only applies for IPv6 Geneve devices");
+			return -EINVAL;
+		}
+	}
+
+	if (data[IFLA_GENEVE_PORT]) {
+		if (changelink) {
+			attrtype = IFLA_GENEVE_PORT;
+			goto change_notsup;
+		}
+		info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
+	}
+
+	if (data[IFLA_GENEVE_COLLECT_METADATA]) {
+		if (changelink) {
+			attrtype = IFLA_GENEVE_COLLECT_METADATA;
+			goto change_notsup;
+		}
+		*metadata = true;
+	}
+
+	if (data[IFLA_GENEVE_UDP_CSUM]) {
+		if (changelink) {
+			attrtype = IFLA_GENEVE_UDP_CSUM;
+			goto change_notsup;
+		}
+		if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
+			info->key.tun_flags |= TUNNEL_CSUM;
+	}
+
+	if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
+#if IS_ENABLED(CONFIG_IPV6)
+		if (changelink) {
+			attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
+			goto change_notsup;
+		}
+		if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
+			info->key.tun_flags &= ~TUNNEL_CSUM;
+#else
+		NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
+				    "IPv6 support not enabled in the kernel");
+		return -EPFNOSUPPORT;
+#endif
+	}
+
+	if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
+#if IS_ENABLED(CONFIG_IPV6)
+		if (changelink) {
+			attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
+			goto change_notsup;
+		}
+		if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
+			*use_udp6_rx_checksums = false;
+#else
+		NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
+				    "IPv6 support not enabled in the kernel");
+		return -EPFNOSUPPORT;
+#endif
+	}
+
+	return 0;
+change_notsup:
+	NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
+			    "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
+	return -EOPNOTSUPP;
+}
+
+static void geneve_link_config(struct net_device *dev,
+			       struct ip_tunnel_info *info, struct nlattr *tb[])
+{
+	struct geneve_dev *geneve = netdev_priv(dev);
+	int ldev_mtu = 0;
+
+	if (tb[IFLA_MTU]) {
+		geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
+		return;
+	}
+
+	switch (ip_tunnel_info_af(info)) {
+	case AF_INET: {
+		struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
+		struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
+
+		if (!IS_ERR(rt) && rt->dst.dev) {
+			ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
+			ip_rt_put(rt);
+		}
+		break;
+	}
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6: {
+		struct rt6_info *rt;
+
+		if (!__in6_dev_get(dev))
+			break;
+
+		rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
+				NULL, 0);
+
+		if (rt && rt->dst.dev)
+			ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
+		ip6_rt_put(rt);
+		break;
+	}
+#endif
+	}
+
+	if (ldev_mtu <= 0)
+		return;
+
+	geneve_change_mtu(dev, ldev_mtu - info->options_len);
+}
+
+static int geneve_newlink(struct net *net, struct net_device *dev,
+			  struct nlattr *tb[], struct nlattr *data[],
+			  struct netlink_ext_ack *extack)
+{
+	bool use_udp6_rx_checksums = false;
+	struct ip_tunnel_info info;
+	bool metadata = false;
+	int err;
+
+	init_tnl_info(&info, GENEVE_UDP_PORT);
+	err = geneve_nl2info(tb, data, extack, &info, &metadata,
+			     &use_udp6_rx_checksums, false);
+	if (err)
+		return err;
+
+	err = geneve_configure(net, dev, extack, &info, metadata,
+			       use_udp6_rx_checksums);
+	if (err)
+		return err;
+
+	geneve_link_config(dev, &info, tb);
+
+	return 0;
+}
+
+/* Quiesces the geneve device data path for both TX and RX.
+ *
+ * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
+ * So, if we set that socket to NULL under RCU and wait for synchronize_net()
+ * to complete for the existing set of in-flight packets to be transmitted,
+ * then we would have quiesced the transmit data path. All the future packets
+ * will get dropped until we unquiesce the data path.
+ *
+ * On receive geneve dereference the geneve_sock stashed in the socket. So,
+ * if we set that to NULL under RCU and wait for synchronize_net() to
+ * complete, then we would have quiesced the receive data path.
+ */
+static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
+			   struct geneve_sock **gs6)
+{
+	*gs4 = rtnl_dereference(geneve->sock4);
+	rcu_assign_pointer(geneve->sock4, NULL);
+	if (*gs4)
+		rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
+#if IS_ENABLED(CONFIG_IPV6)
+	*gs6 = rtnl_dereference(geneve->sock6);
+	rcu_assign_pointer(geneve->sock6, NULL);
+	if (*gs6)
+		rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
+#else
+	*gs6 = NULL;
+#endif
+	synchronize_net();
+}
+
+/* Resumes the geneve device data path for both TX and RX. */
+static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
+			     struct geneve_sock __maybe_unused *gs6)
+{
+	rcu_assign_pointer(geneve->sock4, gs4);
+	if (gs4)
+		rcu_assign_sk_user_data(gs4->sock->sk, gs4);
+#if IS_ENABLED(CONFIG_IPV6)
+	rcu_assign_pointer(geneve->sock6, gs6);
+	if (gs6)
+		rcu_assign_sk_user_data(gs6->sock->sk, gs6);
+#endif
+	synchronize_net();
+}
+
+static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
+			     struct nlattr *data[],
+			     struct netlink_ext_ack *extack)
+{
+	struct geneve_dev *geneve = netdev_priv(dev);
+	struct geneve_sock *gs4, *gs6;
+	struct ip_tunnel_info info;
+	bool metadata;
+	bool use_udp6_rx_checksums;
+	int err;
+
+	/* If the geneve device is configured for metadata (or externally
+	 * controlled, for example, OVS), then nothing can be changed.
+	 */
+	if (geneve->collect_md)
+		return -EOPNOTSUPP;
+
+	/* Start with the existing info. */
+	memcpy(&info, &geneve->info, sizeof(info));
+	metadata = geneve->collect_md;
+	use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
+	err = geneve_nl2info(tb, data, extack, &info, &metadata,
+			     &use_udp6_rx_checksums, true);
+	if (err)
+		return err;
+
+	if (!geneve_dst_addr_equal(&geneve->info, &info)) {
+		dst_cache_reset(&info.dst_cache);
+		geneve_link_config(dev, &info, tb);
+	}
+
+	geneve_quiesce(geneve, &gs4, &gs6);
+	geneve->info = info;
+	geneve->collect_md = metadata;
+	geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
+	geneve_unquiesce(geneve, gs4, gs6);
+
+	return 0;
+}
+
+static void geneve_dellink(struct net_device *dev, struct list_head *head)
+{
+	struct geneve_dev *geneve = netdev_priv(dev);
+
+	list_del(&geneve->next);
+	unregister_netdevice_queue(dev, head);
+}
+
+static size_t geneve_get_size(const struct net_device *dev)
+{
+	return nla_total_size(sizeof(__u32)) +	/* IFLA_GENEVE_ID */
+		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
+		nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
+		nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
+		nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
+		nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
+		nla_total_size(0) +	 /* IFLA_GENEVE_COLLECT_METADATA */
+		nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
+		nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
+		nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
+		0;
+}
+
+static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+	struct geneve_dev *geneve = netdev_priv(dev);
+	struct ip_tunnel_info *info = &geneve->info;
+	bool metadata = geneve->collect_md;
+	__u8 tmp_vni[3];
+	__u32 vni;
+
+	tunnel_id_to_vni(info->key.tun_id, tmp_vni);
+	vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
+	if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
+		goto nla_put_failure;
+
+	if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
+		if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
+				    info->key.u.ipv4.dst))
+			goto nla_put_failure;
+		if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
+			       !!(info->key.tun_flags & TUNNEL_CSUM)))
+			goto nla_put_failure;
+
+#if IS_ENABLED(CONFIG_IPV6)
+	} else if (!metadata) {
+		if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
+				     &info->key.u.ipv6.dst))
+			goto nla_put_failure;
+		if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
+			       !(info->key.tun_flags & TUNNEL_CSUM)))
+			goto nla_put_failure;
+#endif
+	}
+
+	if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
+	    nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
+	    nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
+		goto nla_put_failure;
+
+	if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
+		goto nla_put_failure;
+
+	if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
+		goto nla_put_failure;
+
+#if IS_ENABLED(CONFIG_IPV6)
+	if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
+		       !geneve->use_udp6_rx_checksums))
+		goto nla_put_failure;
+#endif
+
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
+static struct rtnl_link_ops geneve_link_ops __read_mostly = {
+	.kind		= "geneve",
+	.maxtype	= IFLA_GENEVE_MAX,
+	.policy		= geneve_policy,
+	.priv_size	= sizeof(struct geneve_dev),
+	.setup		= geneve_setup,
+	.validate	= geneve_validate,
+	.newlink	= geneve_newlink,
+	.changelink	= geneve_changelink,
+	.dellink	= geneve_dellink,
+	.get_size	= geneve_get_size,
+	.fill_info	= geneve_fill_info,
+};
+
+struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
+					u8 name_assign_type, u16 dst_port)
+{
+	struct nlattr *tb[IFLA_MAX + 1];
+	struct ip_tunnel_info info;
+	struct net_device *dev;
+	LIST_HEAD(list_kill);
+	int err;
+
+	memset(tb, 0, sizeof(tb));
+	dev = rtnl_create_link(net, name, name_assign_type,
+			       &geneve_link_ops, tb);
+	if (IS_ERR(dev))
+		return dev;
+
+	init_tnl_info(&info, dst_port);
+	err = geneve_configure(net, dev, NULL, &info, true, true);
+	if (err) {
+		free_netdev(dev);
+		return ERR_PTR(err);
+	}
+
+	/* openvswitch users expect packet sizes to be unrestricted,
+	 * so set the largest MTU we can.
+	 */
+	err = geneve_change_mtu(dev, IP_MAX_MTU);
+	if (err)
+		goto err;
+
+	err = rtnl_configure_link(dev, NULL);
+	if (err < 0)
+		goto err;
+
+	return dev;
+err:
+	geneve_dellink(dev, &list_kill);
+	unregister_netdevice_many(&list_kill);
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
+
+static int geneve_netdevice_event(struct notifier_block *unused,
+				  unsigned long event, void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+	if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
+	    event == NETDEV_UDP_TUNNEL_DROP_INFO) {
+		geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
+	} else if (event == NETDEV_UNREGISTER) {
+		geneve_offload_rx_ports(dev, false);
+	} else if (event == NETDEV_REGISTER) {
+		geneve_offload_rx_ports(dev, true);
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block geneve_notifier_block __read_mostly = {
+	.notifier_call = geneve_netdevice_event,
+};
+
+static __net_init int geneve_init_net(struct net *net)
+{
+	struct geneve_net *gn = net_generic(net, geneve_net_id);
+
+	INIT_LIST_HEAD(&gn->geneve_list);
+	INIT_LIST_HEAD(&gn->sock_list);
+	return 0;
+}
+
+static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
+{
+	struct geneve_net *gn = net_generic(net, geneve_net_id);
+	struct geneve_dev *geneve, *next;
+	struct net_device *dev, *aux;
+
+	/* gather any geneve devices that were moved into this ns */
+	for_each_netdev_safe(net, dev, aux)
+		if (dev->rtnl_link_ops == &geneve_link_ops)
+			unregister_netdevice_queue(dev, head);
+
+	/* now gather any other geneve devices that were created in this ns */
+	list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
+		/* If geneve->dev is in the same netns, it was already added
+		 * to the list by the previous loop.
+		 */
+		if (!net_eq(dev_net(geneve->dev), net))
+			unregister_netdevice_queue(geneve->dev, head);
+	}
+}
+
+static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
+{
+	struct net *net;
+	LIST_HEAD(list);
+
+	rtnl_lock();
+	list_for_each_entry(net, net_list, exit_list)
+		geneve_destroy_tunnels(net, &list);
+
+	/* unregister the devices gathered above */
+	unregister_netdevice_many(&list);
+	rtnl_unlock();
+
+	list_for_each_entry(net, net_list, exit_list) {
+		const struct geneve_net *gn = net_generic(net, geneve_net_id);
+
+		WARN_ON_ONCE(!list_empty(&gn->sock_list));
+	}
+}
+
+static struct pernet_operations geneve_net_ops = {
+	.init = geneve_init_net,
+	.exit_batch = geneve_exit_batch_net,
+	.id   = &geneve_net_id,
+	.size = sizeof(struct geneve_net),
+};
+
+static int __init geneve_init_module(void)
+{
+	int rc;
+
+	rc = register_pernet_subsys(&geneve_net_ops);
+	if (rc)
+		goto out1;
+
+	rc = register_netdevice_notifier(&geneve_notifier_block);
+	if (rc)
+		goto out2;
+
+	rc = rtnl_link_register(&geneve_link_ops);
+	if (rc)
+		goto out3;
+
+	return 0;
+out3:
+	unregister_netdevice_notifier(&geneve_notifier_block);
+out2:
+	unregister_pernet_subsys(&geneve_net_ops);
+out1:
+	return rc;
+}
+late_initcall(geneve_init_module);
+
+static void __exit geneve_cleanup_module(void)
+{
+	rtnl_link_unregister(&geneve_link_ops);
+	unregister_netdevice_notifier(&geneve_notifier_block);
+	unregister_pernet_subsys(&geneve_net_ops);
+}
+module_exit(geneve_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(GENEVE_NETDEV_VER);
+MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
+MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
+MODULE_ALIAS_RTNL_LINK("geneve");