1 files changed, 806 insertions, 70 deletions

diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 9a0e67b52a4e..2e61ac137128 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2013 Nicira, Inc.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -38,6 +25,7 @@
 #include <net/protocol.h>
 #include <net/ip_tunnels.h>
 #include <net/ip6_tunnel.h>
+#include <net/ip6_checksum.h>
 #include <net/arp.h>
 #include <net/checksum.h>
 #include <net/dsfield.h>
@@ -47,6 +35,9 @@
 #include <net/netns/generic.h>
 #include <net/rtnetlink.h>
 #include <net/dst_metadata.h>
+#include <net/geneve.h>
+#include <net/vxlan.h>
+#include <net/erspan.h>
 
 const struct ip_tunnel_encap_ops __rcu *
 		iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
@@ -58,7 +49,8 @@ EXPORT_SYMBOL(ip6tun_encaps);
 
 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
 		   __be32 src, __be32 dst, __u8 proto,
-		   __u8 tos, __u8 ttl, __be16 df, bool xnet)
+		   __u8 tos, __u8 ttl, __be16 df, bool xnet,
+		   u16 ipcb_flags)
 {
 	int pkt_len = skb->len - skb_inner_network_offset(skb);
 	struct net *net = dev_net(rt->dst.dev);
@@ -71,6 +63,7 @@ void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
 	skb_clear_hash_if_not_l4(skb);
 	skb_dst_set(skb, &rt->dst);
 	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+	IPCB(skb)->flags = ipcb_flags;
 
 	/* Push down and install the IP header. */
 	skb_push(skb, sizeof(struct iphdr));
@@ -89,9 +82,12 @@ void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
 	__ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
 
 	err = ip_local_out(net, sk, skb);
-	if (unlikely(net_xmit_eval(err)))
-		pkt_len = 0;
-	iptunnel_xmit_stats(dev, pkt_len);
+
+	if (dev) {
+		if (unlikely(net_xmit_eval(err)))
+			pkt_len = 0;
+		iptunnel_xmit_stats(dev, pkt_len);
+	}
 }
 EXPORT_SYMBOL_GPL(iptunnel_xmit);
 
@@ -131,28 +127,30 @@ EXPORT_SYMBOL_GPL(__iptunnel_pull_header);
 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
 					     gfp_t flags)
 {
+	IP_TUNNEL_DECLARE_FLAGS(tun_flags) = { };
 	struct metadata_dst *res;
 	struct ip_tunnel_info *dst, *src;
 
 	if (!md || md->type != METADATA_IP_TUNNEL ||
 	    md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
-
 		return NULL;
 
-	res = metadata_dst_alloc(0, METADATA_IP_TUNNEL, flags);
+	src = &md->u.tun_info;
+	res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags);
 	if (!res)
 		return NULL;
 
 	dst = &res->u.tun_info;
-	src = &md->u.tun_info;
 	dst->key.tun_id = src->key.tun_id;
 	if (src->mode & IP_TUNNEL_INFO_IPV6)
 		memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
 		       sizeof(struct in6_addr));
 	else
 		dst->key.u.ipv4.dst = src->key.u.ipv4.src;
-	dst->key.tun_flags = src->key.tun_flags;
+	ip_tunnel_flags_copy(dst->key.tun_flags, src->key.tun_flags);
 	dst->mode = src->mode | IP_TUNNEL_INFO_TX;
+	ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src),
+				src->options_len, tun_flags);
 
 	return res;
 }
@@ -190,61 +188,496 @@ int iptunnel_handle_offloads(struct sk_buff *skb,
 }
 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
 
-/* Often modified stats are per cpu, other are shared (netdev->stats) */
-void ip_tunnel_get_stats64(struct net_device *dev,
-			   struct rtnl_link_stats64 *tot)
+/**
+ * iptunnel_pmtud_build_icmp() - Build ICMP error message for PMTUD
+ * @skb:	Original packet with L2 header
+ * @mtu:	MTU value for ICMP error
+ *
+ * Return: length on success, negative error code if message couldn't be built.
+ */
+static int iptunnel_pmtud_build_icmp(struct sk_buff *skb, int mtu)
+{
+	const struct iphdr *iph = ip_hdr(skb);
+	struct icmphdr *icmph;
+	struct iphdr *niph;
+	struct ethhdr eh;
+	int len, err;
+
+	if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
+		return -EINVAL;
+
+	if (skb_is_gso(skb))
+		skb_gso_reset(skb);
+
+	skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
+	pskb_pull(skb, ETH_HLEN);
+	skb_reset_network_header(skb);
+
+	err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph));
+	if (err)
+		return err;
+
+	len = skb->len + sizeof(*icmph);
+	err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN);
+	if (err)
+		return err;
+
+	icmph = skb_push(skb, sizeof(*icmph));
+	*icmph = (struct icmphdr) {
+		.type			= ICMP_DEST_UNREACH,
+		.code			= ICMP_FRAG_NEEDED,
+		.checksum		= 0,
+		.un.frag.__unused	= 0,
+		.un.frag.mtu		= htons(mtu),
+	};
+	icmph->checksum = csum_fold(skb_checksum(skb, 0, len, 0));
+	skb_reset_transport_header(skb);
+
+	niph = skb_push(skb, sizeof(*niph));
+	*niph = (struct iphdr) {
+		.ihl			= sizeof(*niph) / 4u,
+		.version 		= 4,
+		.tos 			= 0,
+		.tot_len		= htons(len + sizeof(*niph)),
+		.id			= 0,
+		.frag_off		= htons(IP_DF),
+		.ttl			= iph->ttl,
+		.protocol		= IPPROTO_ICMP,
+		.saddr			= iph->daddr,
+		.daddr			= iph->saddr,
+	};
+	ip_send_check(niph);
+	skb_reset_network_header(skb);
+
+	skb->ip_summed = CHECKSUM_NONE;
+
+	eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
+	skb_reset_mac_header(skb);
+
+	return skb->len;
+}
+
+/**
+ * iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed
+ * @skb:	Buffer being sent by encapsulation, L2 headers expected
+ * @mtu:	Network MTU for path
+ *
+ * Return: 0 for no ICMP reply, length if built, negative value on error.
+ */
+static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu)
 {
-	int i;
+	const struct icmphdr *icmph = icmp_hdr(skb);
+	const struct iphdr *iph = ip_hdr(skb);
 
-	netdev_stats_to_stats64(tot, &dev->stats);
+	if (mtu < 576 || iph->frag_off != htons(IP_DF))
+		return 0;
+
+	if (ipv4_is_lbcast(iph->daddr)  || ipv4_is_multicast(iph->daddr) ||
+	    ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr)  ||
+	    ipv4_is_lbcast(iph->saddr)  || ipv4_is_multicast(iph->saddr))
+		return 0;
 
-	for_each_possible_cpu(i) {
-		const struct pcpu_sw_netstats *tstats =
-						   per_cpu_ptr(dev->tstats, i);
-		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
-		unsigned int start;
+	if (iph->protocol == IPPROTO_ICMP && icmp_is_err(icmph->type))
+		return 0;
+
+	return iptunnel_pmtud_build_icmp(skb, mtu);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/**
+ * iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD
+ * @skb:	Original packet with L2 header
+ * @mtu:	MTU value for ICMPv6 error
+ *
+ * Return: length on success, negative error code if message couldn't be built.
+ */
+static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu)
+{
+	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+	struct icmp6hdr *icmp6h;
+	struct ipv6hdr *nip6h;
+	struct ethhdr eh;
+	int len, err;
+	__wsum csum;
+
+	if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
+		return -EINVAL;
+
+	if (skb_is_gso(skb))
+		skb_gso_reset(skb);
+
+	skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
+	pskb_pull(skb, ETH_HLEN);
+	skb_reset_network_header(skb);
+
+	err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h));
+	if (err)
+		return err;
+
+	len = skb->len + sizeof(*icmp6h);
+	err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN);
+	if (err)
+		return err;
+
+	icmp6h = skb_push(skb, sizeof(*icmp6h));
+	*icmp6h = (struct icmp6hdr) {
+		.icmp6_type		= ICMPV6_PKT_TOOBIG,
+		.icmp6_code		= 0,
+		.icmp6_cksum		= 0,
+		.icmp6_mtu		= htonl(mtu),
+	};
+	skb_reset_transport_header(skb);
+
+	nip6h = skb_push(skb, sizeof(*nip6h));
+	*nip6h = (struct ipv6hdr) {
+		.priority		= 0,
+		.version		= 6,
+		.flow_lbl		= { 0 },
+		.payload_len		= htons(len),
+		.nexthdr		= IPPROTO_ICMPV6,
+		.hop_limit		= ip6h->hop_limit,
+		.saddr			= ip6h->daddr,
+		.daddr			= ip6h->saddr,
+	};
+	skb_reset_network_header(skb);
+
+	csum = skb_checksum(skb, skb_transport_offset(skb), len, 0);
+	icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len,
+					      IPPROTO_ICMPV6, csum);
+
+	skb->ip_summed = CHECKSUM_NONE;
+
+	eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
+	skb_reset_mac_header(skb);
+
+	return skb->len;
+}
+
+/**
+ * iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed
+ * @skb:	Buffer being sent by encapsulation, L2 headers expected
+ * @mtu:	Network MTU for path
+ *
+ * Return: 0 for no ICMPv6 reply, length if built, negative value on error.
+ */
+static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu)
+{
+	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+	int stype = ipv6_addr_type(&ip6h->saddr);
+	u8 proto = ip6h->nexthdr;
+	__be16 frag_off;
+	int offset;
+
+	if (mtu < IPV6_MIN_MTU)
+		return 0;
+
+	if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST ||
+	    stype == IPV6_ADDR_LOOPBACK)
+		return 0;
+
+	offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto,
+				  &frag_off);
+	if (offset < 0 || (frag_off & htons(~0x7)))
+		return 0;
 
-		do {
-			start = u64_stats_fetch_begin_irq(&tstats->syncp);
-			rx_packets = tstats->rx_packets;
-			tx_packets = tstats->tx_packets;
-			rx_bytes = tstats->rx_bytes;
-			tx_bytes = tstats->tx_bytes;
-		} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
+	if (proto == IPPROTO_ICMPV6) {
+		struct icmp6hdr *icmp6h;
 
-		tot->rx_packets += rx_packets;
-		tot->tx_packets += tx_packets;
-		tot->rx_bytes   += rx_bytes;
-		tot->tx_bytes   += tx_bytes;
+		if (!pskb_may_pull(skb, skb_network_header(skb) +
+					offset + 1 - skb->data))
+			return 0;
+
+		icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset);
+		if (icmpv6_is_err(icmp6h->icmp6_type) ||
+		    icmp6h->icmp6_type == NDISC_REDIRECT)
+			return 0;
 	}
+
+	return iptunnel_pmtud_build_icmpv6(skb, mtu);
+}
+#endif /* IS_ENABLED(CONFIG_IPV6) */
+
+/**
+ * skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed
+ * @skb:	Buffer being sent by encapsulation, L2 headers expected
+ * @encap_dst:	Destination for tunnel encapsulation (outer IP)
+ * @headroom:	Encapsulation header size, bytes
+ * @reply:	Build matching ICMP or ICMPv6 message as a result
+ *
+ * L2 tunnel implementations that can carry IP and can be directly bridged
+ * (currently UDP tunnels) can't always rely on IP forwarding paths to handle
+ * PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built
+ * based on payload and sent back by the encapsulation itself.
+ *
+ * For routable interfaces, we just need to update the PMTU for the destination.
+ *
+ * Return: 0 if ICMP error not needed, length if built, negative value on error
+ */
+int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
+			  int headroom, bool reply)
+{
+	u32 mtu = dst_mtu(encap_dst) - headroom;
+
+	if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) ||
+	    (!skb_is_gso(skb) && (skb->len - skb_network_offset(skb)) <= mtu))
+		return 0;
+
+	skb_dst_update_pmtu_no_confirm(skb, mtu);
+
+	if (!reply)
+		return 0;
+
+	if (skb->protocol == htons(ETH_P_IP))
+		return iptunnel_pmtud_check_icmp(skb, mtu);
+
+#if IS_ENABLED(CONFIG_IPV6)
+	if (skb->protocol == htons(ETH_P_IPV6))
+		return iptunnel_pmtud_check_icmpv6(skb, mtu);
+#endif
+	return 0;
 }
-EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
+EXPORT_SYMBOL(skb_tunnel_check_pmtu);
 
 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
+	[LWTUNNEL_IP_UNSPEC]	= { .strict_start_type = LWTUNNEL_IP_OPTS },
 	[LWTUNNEL_IP_ID]	= { .type = NLA_U64 },
 	[LWTUNNEL_IP_DST]	= { .type = NLA_U32 },
 	[LWTUNNEL_IP_SRC]	= { .type = NLA_U32 },
 	[LWTUNNEL_IP_TTL]	= { .type = NLA_U8 },
 	[LWTUNNEL_IP_TOS]	= { .type = NLA_U8 },
 	[LWTUNNEL_IP_FLAGS]	= { .type = NLA_U16 },
+	[LWTUNNEL_IP_OPTS]	= { .type = NLA_NESTED },
 };
 
-static int ip_tun_build_state(struct nlattr *attr,
+static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = {
+	[LWTUNNEL_IP_OPTS_GENEVE]	= { .type = NLA_NESTED },
+	[LWTUNNEL_IP_OPTS_VXLAN]	= { .type = NLA_NESTED },
+	[LWTUNNEL_IP_OPTS_ERSPAN]	= { .type = NLA_NESTED },
+};
+
+static const struct nla_policy
+geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = {
+	[LWTUNNEL_IP_OPT_GENEVE_CLASS]	= { .type = NLA_U16 },
+	[LWTUNNEL_IP_OPT_GENEVE_TYPE]	= { .type = NLA_U8 },
+	[LWTUNNEL_IP_OPT_GENEVE_DATA]	= { .type = NLA_BINARY, .len = 127 },
+};
+
+static const struct nla_policy
+vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = {
+	[LWTUNNEL_IP_OPT_VXLAN_GBP]	= { .type = NLA_U32 },
+};
+
+static const struct nla_policy
+erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = {
+	[LWTUNNEL_IP_OPT_ERSPAN_VER]	= { .type = NLA_U8 },
+	[LWTUNNEL_IP_OPT_ERSPAN_INDEX]	= { .type = NLA_U32 },
+	[LWTUNNEL_IP_OPT_ERSPAN_DIR]	= { .type = NLA_U8 },
+	[LWTUNNEL_IP_OPT_ERSPAN_HWID]	= { .type = NLA_U8 },
+};
+
+static int ip_tun_parse_opts_geneve(struct nlattr *attr,
+				    struct ip_tunnel_info *info, int opts_len,
+				    struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1];
+	int data_len, err;
+
+	err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr,
+			       geneve_opt_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] ||
+	    !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] ||
+	    !tb[LWTUNNEL_IP_OPT_GENEVE_DATA])
+		return -EINVAL;
+
+	attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
+	data_len = nla_len(attr);
+	if (data_len % 4)
+		return -EINVAL;
+
+	if (info) {
+		struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;
+
+		memcpy(opt->opt_data, nla_data(attr), data_len);
+		opt->length = data_len / 4;
+		attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS];
+		opt->opt_class = nla_get_be16(attr);
+		attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE];
+		opt->type = nla_get_u8(attr);
+		__set_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags);
+	}
+
+	return sizeof(struct geneve_opt) + data_len;
+}
+
+static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
+				   struct ip_tunnel_info *info, int opts_len,
+				   struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1];
+	int err;
+
+	err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr,
+			       vxlan_opt_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP])
+		return -EINVAL;
+
+	if (info) {
+		struct vxlan_metadata *md =
+			ip_tunnel_info_opts(info) + opts_len;
+
+		attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
+		md->gbp = nla_get_u32(attr);
+		md->gbp &= VXLAN_GBP_MASK;
+		__set_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags);
+	}
+
+	return sizeof(struct vxlan_metadata);
+}
+
+static int ip_tun_parse_opts_erspan(struct nlattr *attr,
+				    struct ip_tunnel_info *info, int opts_len,
+				    struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1];
+	int err;
+	u8 ver;
+
+	err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr,
+			       erspan_opt_policy, extack);
+	if (err)
+		return err;
+
+	if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER])
+		return -EINVAL;
+
+	ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]);
+	if (ver == 1) {
+		if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX])
+			return -EINVAL;
+	} else if (ver == 2) {
+		if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] ||
+		    !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID])
+			return -EINVAL;
+	} else {
+		return -EINVAL;
+	}
+
+	if (info) {
+		struct erspan_metadata *md =
+			ip_tunnel_info_opts(info) + opts_len;
+
+		md->version = ver;
+		if (ver == 1) {
+			attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX];
+			md->u.index = nla_get_be32(attr);
+		} else {
+			attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR];
+			md->u.md2.dir = nla_get_u8(attr);
+			attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID];
+			set_hwid(&md->u.md2, nla_get_u8(attr));
+		}
+
+		__set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, info->key.tun_flags);
+	}
+
+	return sizeof(struct erspan_metadata);
+}
+
+static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
+			     struct netlink_ext_ack *extack)
+{
+	int err, rem, opt_len, opts_len = 0;
+	struct nlattr *nla;
+	u32 type = 0;
+
+	if (!attr)
+		return 0;
+
+	err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX,
+			   ip_opts_policy, extack);
+	if (err)
+		return err;
+
+	nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
+		switch (nla_type(nla)) {
+		case LWTUNNEL_IP_OPTS_GENEVE:
+			if (type && type != IP_TUNNEL_GENEVE_OPT_BIT)
+				return -EINVAL;
+			opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len,
+							   extack);
+			if (opt_len < 0)
+				return opt_len;
+			opts_len += opt_len;
+			if (opts_len > IP_TUNNEL_OPTS_MAX)
+				return -EINVAL;
+			type = IP_TUNNEL_GENEVE_OPT_BIT;
+			break;
+		case LWTUNNEL_IP_OPTS_VXLAN:
+			if (type)
+				return -EINVAL;
+			opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len,
+							  extack);
+			if (opt_len < 0)
+				return opt_len;
+			opts_len += opt_len;
+			type = IP_TUNNEL_VXLAN_OPT_BIT;
+			break;
+		case LWTUNNEL_IP_OPTS_ERSPAN:
+			if (type)
+				return -EINVAL;
+			opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len,
+							   extack);
+			if (opt_len < 0)
+				return opt_len;
+			opts_len += opt_len;
+			type = IP_TUNNEL_ERSPAN_OPT_BIT;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return opts_len;
+}
+
+static int ip_tun_get_optlen(struct nlattr *attr,
+			     struct netlink_ext_ack *extack)
+{
+	return ip_tun_parse_opts(attr, NULL, extack);
+}
+
+static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
+			   struct netlink_ext_ack *extack)
+{
+	return ip_tun_parse_opts(attr, info, extack);
+}
+
+static int ip_tun_build_state(struct net *net, struct nlattr *attr,
 			      unsigned int family, const void *cfg,
 			      struct lwtunnel_state **ts,
 			      struct netlink_ext_ack *extack)
 {
-	struct ip_tunnel_info *tun_info;
-	struct lwtunnel_state *new_state;
 	struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
-	int err;
+	struct lwtunnel_state *new_state;
+	struct ip_tunnel_info *tun_info;
+	int err, opt_len;
 
-	err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy,
-			       extack);
+	err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
+					  ip_tun_policy, extack);
 	if (err < 0)
 		return err;
 
-	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
+	opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
+	if (opt_len < 0)
+		return opt_len;
+
+	new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
 	if (!new_state)
 		return -ENOMEM;
 
@@ -252,6 +685,20 @@ static int ip_tun_build_state(struct nlattr *attr,
 
 	tun_info = lwt_tun_info(new_state);
 
+	err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
+	if (err < 0) {
+		lwtstate_free(new_state);
+		return err;
+	}
+
+#ifdef CONFIG_DST_CACHE
+	err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
+	if (err) {
+		lwtstate_free(new_state);
+		return err;
+	}
+#endif
+
 	if (tb[LWTUNNEL_IP_ID])
 		tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
 
@@ -267,17 +714,142 @@ static int ip_tun_build_state(struct nlattr *attr,
 	if (tb[LWTUNNEL_IP_TOS])
 		tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
 
-	if (tb[LWTUNNEL_IP_FLAGS])
-		tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]);
+	if (tb[LWTUNNEL_IP_FLAGS]) {
+		IP_TUNNEL_DECLARE_FLAGS(flags);
+
+		ip_tunnel_flags_from_be16(flags,
+					  nla_get_be16(tb[LWTUNNEL_IP_FLAGS]));
+		ip_tunnel_clear_options_present(flags);
+
+		ip_tunnel_flags_or(tun_info->key.tun_flags,
+				   tun_info->key.tun_flags, flags);
+	}
 
 	tun_info->mode = IP_TUNNEL_INFO_TX;
-	tun_info->options_len = 0;
+	tun_info->options_len = opt_len;
 
 	*ts = new_state;
 
 	return 0;
 }
 
+static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate)
+{
+#ifdef CONFIG_DST_CACHE
+	struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
+
+	dst_cache_destroy(&tun_info->dst_cache);
+#endif
+}
+
+static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
+					 struct ip_tunnel_info *tun_info)
+{
+	struct geneve_opt *opt;
+	struct nlattr *nest;
+	int offset = 0;
+
+	nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
+	if (!nest)
+		return -ENOMEM;
+
+	while (tun_info->options_len > offset) {
+		opt = ip_tunnel_info_opts(tun_info) + offset;
+		if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS,
+				 opt->opt_class) ||
+		    nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
+		    nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
+			    opt->opt_data)) {
+			nla_nest_cancel(skb, nest);
+			return -ENOMEM;
+		}
+		offset += sizeof(*opt) + opt->length * 4;
+	}
+
+	nla_nest_end(skb, nest);
+	return 0;
+}
+
+static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
+					struct ip_tunnel_info *tun_info)
+{
+	struct vxlan_metadata *md;
+	struct nlattr *nest;
+
+	nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
+	if (!nest)
+		return -ENOMEM;
+
+	md = ip_tunnel_info_opts(tun_info);
+	if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
+		nla_nest_cancel(skb, nest);
+		return -ENOMEM;
+	}
+
+	nla_nest_end(skb, nest);
+	return 0;
+}
+
+static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb,
+					 struct ip_tunnel_info *tun_info)
+{
+	struct erspan_metadata *md;
+	struct nlattr *nest;
+
+	nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN);
+	if (!nest)
+		return -ENOMEM;
+
+	md = ip_tunnel_info_opts(tun_info);
+	if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version))
+		goto err;
+
+	if (md->version == 1 &&
+	    nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index))
+		goto err;
+
+	if (md->version == 2 &&
+	    (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) ||
+	     nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID,
+			get_hwid(&md->u.md2))))
+		goto err;
+
+	nla_nest_end(skb, nest);
+	return 0;
+err:
+	nla_nest_cancel(skb, nest);
+	return -ENOMEM;
+}
+
+static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
+				  struct ip_tunnel_info *tun_info)
+{
+	struct nlattr *nest;
+	int err = 0;
+
+	if (!ip_tunnel_is_options_present(tun_info->key.tun_flags))
+		return 0;
+
+	nest = nla_nest_start_noflag(skb, type);
+	if (!nest)
+		return -ENOMEM;
+
+	if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, tun_info->key.tun_flags))
+		err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
+	else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, tun_info->key.tun_flags))
+		err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
+	else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, tun_info->key.tun_flags))
+		err = ip_tun_fill_encap_opts_erspan(skb, tun_info);
+
+	if (err) {
+		nla_nest_cancel(skb, nest);
+		return err;
+	}
+
+	nla_nest_end(skb, nest);
+	return 0;
+}
+
 static int ip_tun_fill_encap_info(struct sk_buff *skb,
 				  struct lwtunnel_state *lwtstate)
 {
@@ -289,12 +861,53 @@ static int ip_tun_fill_encap_info(struct sk_buff *skb,
 	    nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
 	    nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
 	    nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
-	    nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags))
+	    nla_put_be16(skb, LWTUNNEL_IP_FLAGS,
+			 ip_tunnel_flags_to_be16(tun_info->key.tun_flags)) ||
+	    ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
 		return -ENOMEM;
 
 	return 0;
 }
 
+static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
+{
+	int opt_len;
+
+	if (!ip_tunnel_is_options_present(info->key.tun_flags))
+		return 0;
+
+	opt_len = nla_total_size(0);		/* LWTUNNEL_IP_OPTS */
+	if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags)) {
+		struct geneve_opt *opt;
+		int offset = 0;
+
+		opt_len += nla_total_size(0);	/* LWTUNNEL_IP_OPTS_GENEVE */
+		while (info->options_len > offset) {
+			opt = ip_tunnel_info_opts(info) + offset;
+			opt_len += nla_total_size(2)	/* OPT_GENEVE_CLASS */
+				   + nla_total_size(1)	/* OPT_GENEVE_TYPE */
+				   + nla_total_size(opt->length * 4);
+							/* OPT_GENEVE_DATA */
+			offset += sizeof(*opt) + opt->length * 4;
+		}
+	} else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) {
+		opt_len += nla_total_size(0)	/* LWTUNNEL_IP_OPTS_VXLAN */
+			   + nla_total_size(4);	/* OPT_VXLAN_GBP */
+	} else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, info->key.tun_flags)) {
+		struct erspan_metadata *md = ip_tunnel_info_opts(info);
+
+		opt_len += nla_total_size(0)	/* LWTUNNEL_IP_OPTS_ERSPAN */
+			   + nla_total_size(1)	/* OPT_ERSPAN_VER */
+			   + (md->version == 1 ? nla_total_size(4)
+						/* OPT_ERSPAN_INDEX (v1) */
+					       : nla_total_size(1) +
+						 nla_total_size(1));
+						/* OPT_ERSPAN_DIR + HWID (v2) */
+	}
+
+	return opt_len;
+}
+
 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
 {
 	return nla_total_size_64bit(8)	/* LWTUNNEL_IP_ID */
@@ -302,17 +915,26 @@ static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
 		+ nla_total_size(4)	/* LWTUNNEL_IP_SRC */
 		+ nla_total_size(1)	/* LWTUNNEL_IP_TOS */
 		+ nla_total_size(1)	/* LWTUNNEL_IP_TTL */
-		+ nla_total_size(2);	/* LWTUNNEL_IP_FLAGS */
+		+ nla_total_size(2)	/* LWTUNNEL_IP_FLAGS */
+		+ ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
+					/* LWTUNNEL_IP_OPTS */
 }
 
 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
 {
-	return memcmp(lwt_tun_info(a), lwt_tun_info(b),
-		      sizeof(struct ip_tunnel_info));
+	struct ip_tunnel_info *info_a = lwt_tun_info(a);
+	struct ip_tunnel_info *info_b = lwt_tun_info(b);
+
+	return memcmp(info_a, info_b, sizeof(info_a->key)) ||
+	       info_a->mode != info_b->mode ||
+	       info_a->options_len != info_b->options_len ||
+	       memcmp(ip_tunnel_info_opts(info_a),
+		      ip_tunnel_info_opts(info_b), info_a->options_len);
 }
 
 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
 	.build_state = ip_tun_build_state,
+	.destroy_state = ip_tun_destroy_state,
 	.fill_encap = ip_tun_fill_encap_info,
 	.get_encap_size = ip_tun_encap_nlsize,
 	.cmp_encap = ip_tun_cmp_encap,
@@ -320,30 +942,36 @@ static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
 };
 
 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
+	[LWTUNNEL_IP6_UNSPEC]	= { .strict_start_type = LWTUNNEL_IP6_OPTS },
 	[LWTUNNEL_IP6_ID]		= { .type = NLA_U64 },
 	[LWTUNNEL_IP6_DST]		= { .len = sizeof(struct in6_addr) },
 	[LWTUNNEL_IP6_SRC]		= { .len = sizeof(struct in6_addr) },
 	[LWTUNNEL_IP6_HOPLIMIT]		= { .type = NLA_U8 },
 	[LWTUNNEL_IP6_TC]		= { .type = NLA_U8 },
 	[LWTUNNEL_IP6_FLAGS]		= { .type = NLA_U16 },
+	[LWTUNNEL_IP6_OPTS]		= { .type = NLA_NESTED },
 };
 
-static int ip6_tun_build_state(struct nlattr *attr,
+static int ip6_tun_build_state(struct net *net, struct nlattr *attr,
 			       unsigned int family, const void *cfg,
 			       struct lwtunnel_state **ts,
 			       struct netlink_ext_ack *extack)
 {
-	struct ip_tunnel_info *tun_info;
-	struct lwtunnel_state *new_state;
 	struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
-	int err;
+	struct lwtunnel_state *new_state;
+	struct ip_tunnel_info *tun_info;
+	int err, opt_len;
 
-	err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy,
-			       extack);
+	err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
+					  ip6_tun_policy, extack);
 	if (err < 0)
 		return err;
 
-	new_state = lwtunnel_state_alloc(sizeof(*tun_info));
+	opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
+	if (opt_len < 0)
+		return opt_len;
+
+	new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
 	if (!new_state)
 		return -ENOMEM;
 
@@ -351,6 +979,12 @@ static int ip6_tun_build_state(struct nlattr *attr,
 
 	tun_info = lwt_tun_info(new_state);
 
+	err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
+	if (err < 0) {
+		lwtstate_free(new_state);
+		return err;
+	}
+
 	if (tb[LWTUNNEL_IP6_ID])
 		tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
 
@@ -366,11 +1000,20 @@ static int ip6_tun_build_state(struct nlattr *attr,
 	if (tb[LWTUNNEL_IP6_TC])
 		tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
 
-	if (tb[LWTUNNEL_IP6_FLAGS])
-		tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
+	if (tb[LWTUNNEL_IP6_FLAGS]) {
+		IP_TUNNEL_DECLARE_FLAGS(flags);
+		__be16 data;
+
+		data = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
+		ip_tunnel_flags_from_be16(flags, data);
+		ip_tunnel_clear_options_present(flags);
+
+		ip_tunnel_flags_or(tun_info->key.tun_flags,
+				   tun_info->key.tun_flags, flags);
+	}
 
 	tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
-	tun_info->options_len = 0;
+	tun_info->options_len = opt_len;
 
 	*ts = new_state;
 
@@ -388,7 +1031,9 @@ static int ip6_tun_fill_encap_info(struct sk_buff *skb,
 	    nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
 	    nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
 	    nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
-	    nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
+	    nla_put_be16(skb, LWTUNNEL_IP6_FLAGS,
+			 ip_tunnel_flags_to_be16(tun_info->key.tun_flags)) ||
+	    ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
 		return -ENOMEM;
 
 	return 0;
@@ -401,7 +1046,9 @@ static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
 		+ nla_total_size(16)	/* LWTUNNEL_IP6_SRC */
 		+ nla_total_size(1)	/* LWTUNNEL_IP6_HOPLIMIT */
 		+ nla_total_size(1)	/* LWTUNNEL_IP6_TC */
-		+ nla_total_size(2);	/* LWTUNNEL_IP6_FLAGS */
+		+ nla_total_size(2)	/* LWTUNNEL_IP6_FLAGS */
+		+ ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
+					/* LWTUNNEL_IP6_OPTS */
 }
 
 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
@@ -438,3 +1085,92 @@ void ip_tunnel_unneed_metadata(void)
 	static_branch_dec(&ip_tunnel_metadata_cnt);
 }
 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
+
+/* Returns either the correct skb->protocol value, or 0 if invalid. */
+__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb)
+{
+	if (skb_network_header(skb) >= skb->head &&
+	    (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) &&
+	    ip_hdr(skb)->version == 4)
+		return htons(ETH_P_IP);
+	if (skb_network_header(skb) >= skb->head &&
+	    (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) &&
+	    ipv6_hdr(skb)->version == 6)
+		return htons(ETH_P_IPV6);
+	return 0;
+}
+EXPORT_SYMBOL(ip_tunnel_parse_protocol);
+
+const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
+EXPORT_SYMBOL(ip_tunnel_header_ops);
+
+/* This function returns true when ENCAP attributes are present in the nl msg */
+bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
+				   struct ip_tunnel_encap *encap)
+{
+	bool ret = false;
+
+	memset(encap, 0, sizeof(*encap));
+
+	if (!data)
+		return ret;
+
+	if (data[IFLA_IPTUN_ENCAP_TYPE]) {
+		ret = true;
+		encap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
+	}
+
+	if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
+		ret = true;
+		encap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
+	}
+
+	if (data[IFLA_IPTUN_ENCAP_SPORT]) {
+		ret = true;
+		encap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
+	}
+
+	if (data[IFLA_IPTUN_ENCAP_DPORT]) {
+		ret = true;
+		encap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_netlink_encap_parms);
+
+void ip_tunnel_netlink_parms(struct nlattr *data[],
+			     struct ip_tunnel_parm_kern *parms)
+{
+	if (data[IFLA_IPTUN_LINK])
+		parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
+
+	if (data[IFLA_IPTUN_LOCAL])
+		parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
+
+	if (data[IFLA_IPTUN_REMOTE])
+		parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
+
+	if (data[IFLA_IPTUN_TTL]) {
+		parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
+		if (parms->iph.ttl)
+			parms->iph.frag_off = htons(IP_DF);
+	}
+
+	if (data[IFLA_IPTUN_TOS])
+		parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
+
+	if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
+		parms->iph.frag_off = htons(IP_DF);
+
+	if (data[IFLA_IPTUN_FLAGS]) {
+		__be16 flags;
+
+		flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
+		ip_tunnel_flags_from_be16(parms->i_flags, flags);
+	}
+
+	if (data[IFLA_IPTUN_PROTO])
+		parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_netlink_parms);