Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 1119 insertions, 0 deletions

diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
new file mode 100644
index 0000000000..33b21a0c05
--- /dev/null
+++ b/net/openvswitch/flow.c
@@ -0,0 +1,1119 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2007-2014 Nicira, Inc.
+ */
+
+#include <linux/uaccess.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <net/llc_pdu.h>
+#include <linux/kernel.h>
+#include <linux/jhash.h>
+#include <linux/jiffies.h>
+#include <linux/llc.h>
+#include <linux/module.h>
+#include <linux/in.h>
+#include <linux/rcupdate.h>
+#include <linux/cpumask.h>
+#include <linux/if_arp.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/mpls.h>
+#include <linux/sctp.h>
+#include <linux/smp.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/icmp.h>
+#include <linux/icmpv6.h>
+#include <linux/rculist.h>
+#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/ipv6.h>
+#include <net/mpls.h>
+#include <net/ndisc.h>
+#include <net/nsh.h>
+#include <net/pkt_cls.h>
+#include <net/netfilter/nf_conntrack_zones.h>
+
+#include "conntrack.h"
+#include "datapath.h"
+#include "flow.h"
+#include "flow_netlink.h"
+#include "vport.h"
+
+u64 ovs_flow_used_time(unsigned long flow_jiffies)
+{
+	struct timespec64 cur_ts;
+	u64 cur_ms, idle_ms;
+
+	ktime_get_ts64(&cur_ts);
+	idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
+	cur_ms = (u64)(u32)cur_ts.tv_sec * MSEC_PER_SEC +
+		 cur_ts.tv_nsec / NSEC_PER_MSEC;
+
+	return cur_ms - idle_ms;
+}
+
+#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
+
+void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
+			   const struct sk_buff *skb)
+{
+	struct sw_flow_stats *stats;
+	unsigned int cpu = smp_processor_id();
+	int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
+
+	stats = rcu_dereference(flow->stats[cpu]);
+
+	/* Check if already have CPU-specific stats. */
+	if (likely(stats)) {
+		spin_lock(&stats->lock);
+		/* Mark if we write on the pre-allocated stats. */
+		if (cpu == 0 && unlikely(flow->stats_last_writer != cpu))
+			flow->stats_last_writer = cpu;
+	} else {
+		stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
+		spin_lock(&stats->lock);
+
+		/* If the current CPU is the only writer on the
+		 * pre-allocated stats keep using them.
+		 */
+		if (unlikely(flow->stats_last_writer != cpu)) {
+			/* A previous locker may have already allocated the
+			 * stats, so we need to check again.  If CPU-specific
+			 * stats were already allocated, we update the pre-
+			 * allocated stats as we have already locked them.
+			 */
+			if (likely(flow->stats_last_writer != -1) &&
+			    likely(!rcu_access_pointer(flow->stats[cpu]))) {
+				/* Try to allocate CPU-specific stats. */
+				struct sw_flow_stats *new_stats;
+
+				new_stats =
+					kmem_cache_alloc_node(flow_stats_cache,
+							      GFP_NOWAIT |
+							      __GFP_THISNODE |
+							      __GFP_NOWARN |
+							      __GFP_NOMEMALLOC,
+							      numa_node_id());
+				if (likely(new_stats)) {
+					new_stats->used = jiffies;
+					new_stats->packet_count = 1;
+					new_stats->byte_count = len;
+					new_stats->tcp_flags = tcp_flags;
+					spin_lock_init(&new_stats->lock);
+
+					rcu_assign_pointer(flow->stats[cpu],
+							   new_stats);
+					cpumask_set_cpu(cpu,
+							flow->cpu_used_mask);
+					goto unlock;
+				}
+			}
+			flow->stats_last_writer = cpu;
+		}
+	}
+
+	stats->used = jiffies;
+	stats->packet_count++;
+	stats->byte_count += len;
+	stats->tcp_flags |= tcp_flags;
+unlock:
+	spin_unlock(&stats->lock);
+}
+
+/* Must be called with rcu_read_lock or ovs_mutex. */
+void ovs_flow_stats_get(const struct sw_flow *flow,
+			struct ovs_flow_stats *ovs_stats,
+			unsigned long *used, __be16 *tcp_flags)
+{
+	int cpu;
+
+	*used = 0;
+	*tcp_flags = 0;
+	memset(ovs_stats, 0, sizeof(*ovs_stats));
+
+	/* We open code this to make sure cpu 0 is always considered */
+	for (cpu = 0; cpu < nr_cpu_ids;
+	     cpu = cpumask_next(cpu, flow->cpu_used_mask)) {
+		struct sw_flow_stats *stats = rcu_dereference_ovsl(flow->stats[cpu]);
+
+		if (stats) {
+			/* Local CPU may write on non-local stats, so we must
+			 * block bottom-halves here.
+			 */
+			spin_lock_bh(&stats->lock);
+			if (!*used || time_after(stats->used, *used))
+				*used = stats->used;
+			*tcp_flags |= stats->tcp_flags;
+			ovs_stats->n_packets += stats->packet_count;
+			ovs_stats->n_bytes += stats->byte_count;
+			spin_unlock_bh(&stats->lock);
+		}
+	}
+}
+
+/* Called with ovs_mutex. */
+void ovs_flow_stats_clear(struct sw_flow *flow)
+{
+	int cpu;
+
+	/* We open code this to make sure cpu 0 is always considered */
+	for (cpu = 0; cpu < nr_cpu_ids;
+	     cpu = cpumask_next(cpu, flow->cpu_used_mask)) {
+		struct sw_flow_stats *stats = ovsl_dereference(flow->stats[cpu]);
+
+		if (stats) {
+			spin_lock_bh(&stats->lock);
+			stats->used = 0;
+			stats->packet_count = 0;
+			stats->byte_count = 0;
+			stats->tcp_flags = 0;
+			spin_unlock_bh(&stats->lock);
+		}
+	}
+}
+
+static int check_header(struct sk_buff *skb, int len)
+{
+	if (unlikely(skb->len < len))
+		return -EINVAL;
+	if (unlikely(!pskb_may_pull(skb, len)))
+		return -ENOMEM;
+	return 0;
+}
+
+static bool arphdr_ok(struct sk_buff *skb)
+{
+	return pskb_may_pull(skb, skb_network_offset(skb) +
+				  sizeof(struct arp_eth_header));
+}
+
+static int check_iphdr(struct sk_buff *skb)
+{
+	unsigned int nh_ofs = skb_network_offset(skb);
+	unsigned int ip_len;
+	int err;
+
+	err = check_header(skb, nh_ofs + sizeof(struct iphdr));
+	if (unlikely(err))
+		return err;
+
+	ip_len = ip_hdrlen(skb);
+	if (unlikely(ip_len < sizeof(struct iphdr) ||
+		     skb->len < nh_ofs + ip_len))
+		return -EINVAL;
+
+	skb_set_transport_header(skb, nh_ofs + ip_len);
+	return 0;
+}
+
+static bool tcphdr_ok(struct sk_buff *skb)
+{
+	int th_ofs = skb_transport_offset(skb);
+	int tcp_len;
+
+	if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
+		return false;
+
+	tcp_len = tcp_hdrlen(skb);
+	if (unlikely(tcp_len < sizeof(struct tcphdr) ||
+		     skb->len < th_ofs + tcp_len))
+		return false;
+
+	return true;
+}
+
+static bool udphdr_ok(struct sk_buff *skb)
+{
+	return pskb_may_pull(skb, skb_transport_offset(skb) +
+				  sizeof(struct udphdr));
+}
+
+static bool sctphdr_ok(struct sk_buff *skb)
+{
+	return pskb_may_pull(skb, skb_transport_offset(skb) +
+				  sizeof(struct sctphdr));
+}
+
+static bool icmphdr_ok(struct sk_buff *skb)
+{
+	return pskb_may_pull(skb, skb_transport_offset(skb) +
+				  sizeof(struct icmphdr));
+}
+
+/**
+ * get_ipv6_ext_hdrs() - Parses packet and sets IPv6 extension header flags.
+ *
+ * @skb: buffer where extension header data starts in packet
+ * @nh: ipv6 header
+ * @ext_hdrs: flags are stored here
+ *
+ * OFPIEH12_UNREP is set if more than one of a given IPv6 extension header
+ * is unexpectedly encountered. (Two destination options headers may be
+ * expected and would not cause this bit to be set.)
+ *
+ * OFPIEH12_UNSEQ is set if IPv6 extension headers were not in the order
+ * preferred (but not required) by RFC 2460:
+ *
+ * When more than one extension header is used in the same packet, it is
+ * recommended that those headers appear in the following order:
+ *      IPv6 header
+ *      Hop-by-Hop Options header
+ *      Destination Options header
+ *      Routing header
+ *      Fragment header
+ *      Authentication header
+ *      Encapsulating Security Payload header
+ *      Destination Options header
+ *      upper-layer header
+ */
+static void get_ipv6_ext_hdrs(struct sk_buff *skb, struct ipv6hdr *nh,
+			      u16 *ext_hdrs)
+{
+	u8 next_type = nh->nexthdr;
+	unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr);
+	int dest_options_header_count = 0;
+
+	*ext_hdrs = 0;
+
+	while (ipv6_ext_hdr(next_type)) {
+		struct ipv6_opt_hdr _hdr, *hp;
+
+		switch (next_type) {
+		case IPPROTO_NONE:
+			*ext_hdrs |= OFPIEH12_NONEXT;
+			/* stop parsing */
+			return;
+
+		case IPPROTO_ESP:
+			if (*ext_hdrs & OFPIEH12_ESP)
+				*ext_hdrs |= OFPIEH12_UNREP;
+			if ((*ext_hdrs & ~(OFPIEH12_HOP | OFPIEH12_DEST |
+					   OFPIEH12_ROUTER | IPPROTO_FRAGMENT |
+					   OFPIEH12_AUTH | OFPIEH12_UNREP)) ||
+			    dest_options_header_count >= 2) {
+				*ext_hdrs |= OFPIEH12_UNSEQ;
+			}
+			*ext_hdrs |= OFPIEH12_ESP;
+			break;
+
+		case IPPROTO_AH:
+			if (*ext_hdrs & OFPIEH12_AUTH)
+				*ext_hdrs |= OFPIEH12_UNREP;
+			if ((*ext_hdrs &
+			     ~(OFPIEH12_HOP | OFPIEH12_DEST | OFPIEH12_ROUTER |
+			       IPPROTO_FRAGMENT | OFPIEH12_UNREP)) ||
+			    dest_options_header_count >= 2) {
+				*ext_hdrs |= OFPIEH12_UNSEQ;
+			}
+			*ext_hdrs |= OFPIEH12_AUTH;
+			break;
+
+		case IPPROTO_DSTOPTS:
+			if (dest_options_header_count == 0) {
+				if (*ext_hdrs &
+				    ~(OFPIEH12_HOP | OFPIEH12_UNREP))
+					*ext_hdrs |= OFPIEH12_UNSEQ;
+				*ext_hdrs |= OFPIEH12_DEST;
+			} else if (dest_options_header_count == 1) {
+				if (*ext_hdrs &
+				    ~(OFPIEH12_HOP | OFPIEH12_DEST |
+				      OFPIEH12_ROUTER | OFPIEH12_FRAG |
+				      OFPIEH12_AUTH | OFPIEH12_ESP |
+				      OFPIEH12_UNREP)) {
+					*ext_hdrs |= OFPIEH12_UNSEQ;
+				}
+			} else {
+				*ext_hdrs |= OFPIEH12_UNREP;
+			}
+			dest_options_header_count++;
+			break;
+
+		case IPPROTO_FRAGMENT:
+			if (*ext_hdrs & OFPIEH12_FRAG)
+				*ext_hdrs |= OFPIEH12_UNREP;
+			if ((*ext_hdrs & ~(OFPIEH12_HOP |
+					   OFPIEH12_DEST |
+					   OFPIEH12_ROUTER |
+					   OFPIEH12_UNREP)) ||
+			    dest_options_header_count >= 2) {
+				*ext_hdrs |= OFPIEH12_UNSEQ;
+			}
+			*ext_hdrs |= OFPIEH12_FRAG;
+			break;
+
+		case IPPROTO_ROUTING:
+			if (*ext_hdrs & OFPIEH12_ROUTER)
+				*ext_hdrs |= OFPIEH12_UNREP;
+			if ((*ext_hdrs & ~(OFPIEH12_HOP |
+					   OFPIEH12_DEST |
+					   OFPIEH12_UNREP)) ||
+			    dest_options_header_count >= 2) {
+				*ext_hdrs |= OFPIEH12_UNSEQ;
+			}
+			*ext_hdrs |= OFPIEH12_ROUTER;
+			break;
+
+		case IPPROTO_HOPOPTS:
+			if (*ext_hdrs & OFPIEH12_HOP)
+				*ext_hdrs |= OFPIEH12_UNREP;
+			/* OFPIEH12_HOP is set to 1 if a hop-by-hop IPv6
+			 * extension header is present as the first
+			 * extension header in the packet.
+			 */
+			if (*ext_hdrs == 0)
+				*ext_hdrs |= OFPIEH12_HOP;
+			else
+				*ext_hdrs |= OFPIEH12_UNSEQ;
+			break;
+
+		default:
+			return;
+		}
+
+		hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
+		if (!hp)
+			break;
+		next_type = hp->nexthdr;
+		start += ipv6_optlen(hp);
+	}
+}
+
+static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	unsigned short frag_off;
+	unsigned int payload_ofs = 0;
+	unsigned int nh_ofs = skb_network_offset(skb);
+	unsigned int nh_len;
+	struct ipv6hdr *nh;
+	int err, nexthdr, flags = 0;
+
+	err = check_header(skb, nh_ofs + sizeof(*nh));
+	if (unlikely(err))
+		return err;
+
+	nh = ipv6_hdr(skb);
+
+	get_ipv6_ext_hdrs(skb, nh, &key->ipv6.exthdrs);
+
+	key->ip.proto = NEXTHDR_NONE;
+	key->ip.tos = ipv6_get_dsfield(nh);
+	key->ip.ttl = nh->hop_limit;
+	key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
+	key->ipv6.addr.src = nh->saddr;
+	key->ipv6.addr.dst = nh->daddr;
+
+	nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
+	if (flags & IP6_FH_F_FRAG) {
+		if (frag_off) {
+			key->ip.frag = OVS_FRAG_TYPE_LATER;
+			key->ip.proto = NEXTHDR_FRAGMENT;
+			return 0;
+		}
+		key->ip.frag = OVS_FRAG_TYPE_FIRST;
+	} else {
+		key->ip.frag = OVS_FRAG_TYPE_NONE;
+	}
+
+	/* Delayed handling of error in ipv6_find_hdr() as it
+	 * always sets flags and frag_off to a valid value which may be
+	 * used to set key->ip.frag above.
+	 */
+	if (unlikely(nexthdr < 0))
+		return -EPROTO;
+
+	nh_len = payload_ofs - nh_ofs;
+	skb_set_transport_header(skb, nh_ofs + nh_len);
+	key->ip.proto = nexthdr;
+	return nh_len;
+}
+
+static bool icmp6hdr_ok(struct sk_buff *skb)
+{
+	return pskb_may_pull(skb, skb_transport_offset(skb) +
+				  sizeof(struct icmp6hdr));
+}
+
+/**
+ * parse_vlan_tag - Parse vlan tag from vlan header.
+ * @skb: skb containing frame to parse
+ * @key_vh: pointer to parsed vlan tag
+ * @untag_vlan: should the vlan header be removed from the frame
+ *
+ * Return: ERROR on memory error.
+ * %0 if it encounters a non-vlan or incomplete packet.
+ * %1 after successfully parsing vlan tag.
+ */
+static int parse_vlan_tag(struct sk_buff *skb, struct vlan_head *key_vh,
+			  bool untag_vlan)
+{
+	struct vlan_head *vh = (struct vlan_head *)skb->data;
+
+	if (likely(!eth_type_vlan(vh->tpid)))
+		return 0;
+
+	if (unlikely(skb->len < sizeof(struct vlan_head) + sizeof(__be16)))
+		return 0;
+
+	if (unlikely(!pskb_may_pull(skb, sizeof(struct vlan_head) +
+				 sizeof(__be16))))
+		return -ENOMEM;
+
+	vh = (struct vlan_head *)skb->data;
+	key_vh->tci = vh->tci | htons(VLAN_CFI_MASK);
+	key_vh->tpid = vh->tpid;
+
+	if (unlikely(untag_vlan)) {
+		int offset = skb->data - skb_mac_header(skb);
+		u16 tci;
+		int err;
+
+		__skb_push(skb, offset);
+		err = __skb_vlan_pop(skb, &tci);
+		__skb_pull(skb, offset);
+		if (err)
+			return err;
+		__vlan_hwaccel_put_tag(skb, key_vh->tpid, tci);
+	} else {
+		__skb_pull(skb, sizeof(struct vlan_head));
+	}
+	return 1;
+}
+
+static void clear_vlan(struct sw_flow_key *key)
+{
+	key->eth.vlan.tci = 0;
+	key->eth.vlan.tpid = 0;
+	key->eth.cvlan.tci = 0;
+	key->eth.cvlan.tpid = 0;
+}
+
+static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int res;
+
+	if (skb_vlan_tag_present(skb)) {
+		key->eth.vlan.tci = htons(skb->vlan_tci) | htons(VLAN_CFI_MASK);
+		key->eth.vlan.tpid = skb->vlan_proto;
+	} else {
+		/* Parse outer vlan tag in the non-accelerated case. */
+		res = parse_vlan_tag(skb, &key->eth.vlan, true);
+		if (res <= 0)
+			return res;
+	}
+
+	/* Parse inner vlan tag. */
+	res = parse_vlan_tag(skb, &key->eth.cvlan, false);
+	if (res <= 0)
+		return res;
+
+	return 0;
+}
+
+static __be16 parse_ethertype(struct sk_buff *skb)
+{
+	struct llc_snap_hdr {
+		u8  dsap;  /* Always 0xAA */
+		u8  ssap;  /* Always 0xAA */
+		u8  ctrl;
+		u8  oui[3];
+		__be16 ethertype;
+	};
+	struct llc_snap_hdr *llc;
+	__be16 proto;
+
+	proto = *(__be16 *) skb->data;
+	__skb_pull(skb, sizeof(__be16));
+
+	if (eth_proto_is_802_3(proto))
+		return proto;
+
+	if (skb->len < sizeof(struct llc_snap_hdr))
+		return htons(ETH_P_802_2);
+
+	if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
+		return htons(0);
+
+	llc = (struct llc_snap_hdr *) skb->data;
+	if (llc->dsap != LLC_SAP_SNAP ||
+	    llc->ssap != LLC_SAP_SNAP ||
+	    (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
+		return htons(ETH_P_802_2);
+
+	__skb_pull(skb, sizeof(struct llc_snap_hdr));
+
+	if (eth_proto_is_802_3(llc->ethertype))
+		return llc->ethertype;
+
+	return htons(ETH_P_802_2);
+}
+
+static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
+			int nh_len)
+{
+	struct icmp6hdr *icmp = icmp6_hdr(skb);
+
+	/* The ICMPv6 type and code fields use the 16-bit transport port
+	 * fields, so we need to store them in 16-bit network byte order.
+	 */
+	key->tp.src = htons(icmp->icmp6_type);
+	key->tp.dst = htons(icmp->icmp6_code);
+	memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
+
+	if (icmp->icmp6_code == 0 &&
+	    (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
+	     icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
+		int icmp_len = skb->len - skb_transport_offset(skb);
+		struct nd_msg *nd;
+		int offset;
+
+		/* In order to process neighbor discovery options, we need the
+		 * entire packet.
+		 */
+		if (unlikely(icmp_len < sizeof(*nd)))
+			return 0;
+
+		if (unlikely(skb_linearize(skb)))
+			return -ENOMEM;
+
+		nd = (struct nd_msg *)skb_transport_header(skb);
+		key->ipv6.nd.target = nd->target;
+
+		icmp_len -= sizeof(*nd);
+		offset = 0;
+		while (icmp_len >= 8) {
+			struct nd_opt_hdr *nd_opt =
+				 (struct nd_opt_hdr *)(nd->opt + offset);
+			int opt_len = nd_opt->nd_opt_len * 8;
+
+			if (unlikely(!opt_len || opt_len > icmp_len))
+				return 0;
+
+			/* Store the link layer address if the appropriate
+			 * option is provided.  It is considered an error if
+			 * the same link layer option is specified twice.
+			 */
+			if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
+			    && opt_len == 8) {
+				if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
+					goto invalid;
+				ether_addr_copy(key->ipv6.nd.sll,
+						&nd->opt[offset+sizeof(*nd_opt)]);
+			} else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
+				   && opt_len == 8) {
+				if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
+					goto invalid;
+				ether_addr_copy(key->ipv6.nd.tll,
+						&nd->opt[offset+sizeof(*nd_opt)]);
+			}
+
+			icmp_len -= opt_len;
+			offset += opt_len;
+		}
+	}
+
+	return 0;
+
+invalid:
+	memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
+	memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
+	memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
+
+	return 0;
+}
+
+static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	struct nshhdr *nh;
+	unsigned int nh_ofs = skb_network_offset(skb);
+	u8 version, length;
+	int err;
+
+	err = check_header(skb, nh_ofs + NSH_BASE_HDR_LEN);
+	if (unlikely(err))
+		return err;
+
+	nh = nsh_hdr(skb);
+	version = nsh_get_ver(nh);
+	length = nsh_hdr_len(nh);
+
+	if (version != 0)
+		return -EINVAL;
+
+	err = check_header(skb, nh_ofs + length);
+	if (unlikely(err))
+		return err;
+
+	nh = nsh_hdr(skb);
+	key->nsh.base.flags = nsh_get_flags(nh);
+	key->nsh.base.ttl = nsh_get_ttl(nh);
+	key->nsh.base.mdtype = nh->mdtype;
+	key->nsh.base.np = nh->np;
+	key->nsh.base.path_hdr = nh->path_hdr;
+	switch (key->nsh.base.mdtype) {
+	case NSH_M_TYPE1:
+		if (length != NSH_M_TYPE1_LEN)
+			return -EINVAL;
+		memcpy(key->nsh.context, nh->md1.context,
+		       sizeof(nh->md1));
+		break;
+	case NSH_M_TYPE2:
+		memset(key->nsh.context, 0,
+		       sizeof(nh->md1));
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * key_extract_l3l4 - extracts L3/L4 header information.
+ * @skb: sk_buff that contains the frame, with skb->data pointing to the
+ *       L3 header
+ * @key: output flow key
+ *
+ * Return: %0 if successful, otherwise a negative errno value.
+ */
+static int key_extract_l3l4(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int error;
+
+	/* Network layer. */
+	if (key->eth.type == htons(ETH_P_IP)) {
+		struct iphdr *nh;
+		__be16 offset;
+
+		error = check_iphdr(skb);
+		if (unlikely(error)) {
+			memset(&key->ip, 0, sizeof(key->ip));
+			memset(&key->ipv4, 0, sizeof(key->ipv4));
+			if (error == -EINVAL) {
+				skb->transport_header = skb->network_header;
+				error = 0;
+			}
+			return error;
+		}
+
+		nh = ip_hdr(skb);
+		key->ipv4.addr.src = nh->saddr;
+		key->ipv4.addr.dst = nh->daddr;
+
+		key->ip.proto = nh->protocol;
+		key->ip.tos = nh->tos;
+		key->ip.ttl = nh->ttl;
+
+		offset = nh->frag_off & htons(IP_OFFSET);
+		if (offset) {
+			key->ip.frag = OVS_FRAG_TYPE_LATER;
+			memset(&key->tp, 0, sizeof(key->tp));
+			return 0;
+		}
+		if (nh->frag_off & htons(IP_MF) ||
+			skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
+			key->ip.frag = OVS_FRAG_TYPE_FIRST;
+		else
+			key->ip.frag = OVS_FRAG_TYPE_NONE;
+
+		/* Transport layer. */
+		if (key->ip.proto == IPPROTO_TCP) {
+			if (tcphdr_ok(skb)) {
+				struct tcphdr *tcp = tcp_hdr(skb);
+				key->tp.src = tcp->source;
+				key->tp.dst = tcp->dest;
+				key->tp.flags = TCP_FLAGS_BE16(tcp);
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+
+		} else if (key->ip.proto == IPPROTO_UDP) {
+			if (udphdr_ok(skb)) {
+				struct udphdr *udp = udp_hdr(skb);
+				key->tp.src = udp->source;
+				key->tp.dst = udp->dest;
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		} else if (key->ip.proto == IPPROTO_SCTP) {
+			if (sctphdr_ok(skb)) {
+				struct sctphdr *sctp = sctp_hdr(skb);
+				key->tp.src = sctp->source;
+				key->tp.dst = sctp->dest;
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		} else if (key->ip.proto == IPPROTO_ICMP) {
+			if (icmphdr_ok(skb)) {
+				struct icmphdr *icmp = icmp_hdr(skb);
+				/* The ICMP type and code fields use the 16-bit
+				 * transport port fields, so we need to store
+				 * them in 16-bit network byte order. */
+				key->tp.src = htons(icmp->type);
+				key->tp.dst = htons(icmp->code);
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		}
+
+	} else if (key->eth.type == htons(ETH_P_ARP) ||
+		   key->eth.type == htons(ETH_P_RARP)) {
+		struct arp_eth_header *arp;
+		bool arp_available = arphdr_ok(skb);
+
+		arp = (struct arp_eth_header *)skb_network_header(skb);
+
+		if (arp_available &&
+		    arp->ar_hrd == htons(ARPHRD_ETHER) &&
+		    arp->ar_pro == htons(ETH_P_IP) &&
+		    arp->ar_hln == ETH_ALEN &&
+		    arp->ar_pln == 4) {
+
+			/* We only match on the lower 8 bits of the opcode. */
+			if (ntohs(arp->ar_op) <= 0xff)
+				key->ip.proto = ntohs(arp->ar_op);
+			else
+				key->ip.proto = 0;
+
+			memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
+			memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
+			ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
+			ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
+		} else {
+			memset(&key->ip, 0, sizeof(key->ip));
+			memset(&key->ipv4, 0, sizeof(key->ipv4));
+		}
+	} else if (eth_p_mpls(key->eth.type)) {
+		u8 label_count = 1;
+
+		memset(&key->mpls, 0, sizeof(key->mpls));
+		skb_set_inner_network_header(skb, skb->mac_len);
+		while (1) {
+			__be32 lse;
+
+			error = check_header(skb, skb->mac_len +
+					     label_count * MPLS_HLEN);
+			if (unlikely(error))
+				return 0;
+
+			memcpy(&lse, skb_inner_network_header(skb), MPLS_HLEN);
+
+			if (label_count <= MPLS_LABEL_DEPTH)
+				memcpy(&key->mpls.lse[label_count - 1], &lse,
+				       MPLS_HLEN);
+
+			skb_set_inner_network_header(skb, skb->mac_len +
+						     label_count * MPLS_HLEN);
+			if (lse & htonl(MPLS_LS_S_MASK))
+				break;
+
+			label_count++;
+		}
+		if (label_count > MPLS_LABEL_DEPTH)
+			label_count = MPLS_LABEL_DEPTH;
+
+		key->mpls.num_labels_mask = GENMASK(label_count - 1, 0);
+	} else if (key->eth.type == htons(ETH_P_IPV6)) {
+		int nh_len;             /* IPv6 Header + Extensions */
+
+		nh_len = parse_ipv6hdr(skb, key);
+		if (unlikely(nh_len < 0)) {
+			switch (nh_len) {
+			case -EINVAL:
+				memset(&key->ip, 0, sizeof(key->ip));
+				memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
+				fallthrough;
+			case -EPROTO:
+				skb->transport_header = skb->network_header;
+				error = 0;
+				break;
+			default:
+				error = nh_len;
+			}
+			return error;
+		}
+
+		if (key->ip.frag == OVS_FRAG_TYPE_LATER) {
+			memset(&key->tp, 0, sizeof(key->tp));
+			return 0;
+		}
+		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
+			key->ip.frag = OVS_FRAG_TYPE_FIRST;
+
+		/* Transport layer. */
+		if (key->ip.proto == NEXTHDR_TCP) {
+			if (tcphdr_ok(skb)) {
+				struct tcphdr *tcp = tcp_hdr(skb);
+				key->tp.src = tcp->source;
+				key->tp.dst = tcp->dest;
+				key->tp.flags = TCP_FLAGS_BE16(tcp);
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		} else if (key->ip.proto == NEXTHDR_UDP) {
+			if (udphdr_ok(skb)) {
+				struct udphdr *udp = udp_hdr(skb);
+				key->tp.src = udp->source;
+				key->tp.dst = udp->dest;
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		} else if (key->ip.proto == NEXTHDR_SCTP) {
+			if (sctphdr_ok(skb)) {
+				struct sctphdr *sctp = sctp_hdr(skb);
+				key->tp.src = sctp->source;
+				key->tp.dst = sctp->dest;
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		} else if (key->ip.proto == NEXTHDR_ICMP) {
+			if (icmp6hdr_ok(skb)) {
+				error = parse_icmpv6(skb, key, nh_len);
+				if (error)
+					return error;
+			} else {
+				memset(&key->tp, 0, sizeof(key->tp));
+			}
+		}
+	} else if (key->eth.type == htons(ETH_P_NSH)) {
+		error = parse_nsh(skb, key);
+		if (error)
+			return error;
+	}
+	return 0;
+}
+
+/**
+ * key_extract - extracts a flow key from an Ethernet frame.
+ * @skb: sk_buff that contains the frame, with skb->data pointing to the
+ * Ethernet header
+ * @key: output flow key
+ *
+ * The caller must ensure that skb->len >= ETH_HLEN.
+ *
+ * Initializes @skb header fields as follows:
+ *
+ *    - skb->mac_header: the L2 header.
+ *
+ *    - skb->network_header: just past the L2 header, or just past the
+ *      VLAN header, to the first byte of the L2 payload.
+ *
+ *    - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
+ *      on output, then just past the IP header, if one is present and
+ *      of a correct length, otherwise the same as skb->network_header.
+ *      For other key->eth.type values it is left untouched.
+ *
+ *    - skb->protocol: the type of the data starting at skb->network_header.
+ *      Equals to key->eth.type.
+ *
+ * Return: %0 if successful, otherwise a negative errno value.
+ */
+static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	struct ethhdr *eth;
+
+	/* Flags are always used as part of stats */
+	key->tp.flags = 0;
+
+	skb_reset_mac_header(skb);
+
+	/* Link layer. */
+	clear_vlan(key);
+	if (ovs_key_mac_proto(key) == MAC_PROTO_NONE) {
+		if (unlikely(eth_type_vlan(skb->protocol)))
+			return -EINVAL;
+
+		skb_reset_network_header(skb);
+		key->eth.type = skb->protocol;
+	} else {
+		eth = eth_hdr(skb);
+		ether_addr_copy(key->eth.src, eth->h_source);
+		ether_addr_copy(key->eth.dst, eth->h_dest);
+
+		__skb_pull(skb, 2 * ETH_ALEN);
+		/* We are going to push all headers that we pull, so no need to
+		 * update skb->csum here.
+		 */
+
+		if (unlikely(parse_vlan(skb, key)))
+			return -ENOMEM;
+
+		key->eth.type = parse_ethertype(skb);
+		if (unlikely(key->eth.type == htons(0)))
+			return -ENOMEM;
+
+		/* Multiple tagged packets need to retain TPID to satisfy
+		 * skb_vlan_pop(), which will later shift the ethertype into
+		 * skb->protocol.
+		 */
+		if (key->eth.cvlan.tci & htons(VLAN_CFI_MASK))
+			skb->protocol = key->eth.cvlan.tpid;
+		else
+			skb->protocol = key->eth.type;
+
+		skb_reset_network_header(skb);
+		__skb_push(skb, skb->data - skb_mac_header(skb));
+	}
+
+	skb_reset_mac_len(skb);
+
+	/* Fill out L3/L4 key info, if any */
+	return key_extract_l3l4(skb, key);
+}
+
+/* In the case of conntrack fragment handling it expects L3 headers,
+ * add a helper.
+ */
+int ovs_flow_key_update_l3l4(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	return key_extract_l3l4(skb, key);
+}
+
+int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int res;
+
+	res = key_extract(skb, key);
+	if (!res)
+		key->mac_proto &= ~SW_FLOW_KEY_INVALID;
+
+	return res;
+}
+
+static int key_extract_mac_proto(struct sk_buff *skb)
+{
+	switch (skb->dev->type) {
+	case ARPHRD_ETHER:
+		return MAC_PROTO_ETHERNET;
+	case ARPHRD_NONE:
+		if (skb->protocol == htons(ETH_P_TEB))
+			return MAC_PROTO_ETHERNET;
+		return MAC_PROTO_NONE;
+	}
+	WARN_ON_ONCE(1);
+	return -EINVAL;
+}
+
+int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
+			 struct sk_buff *skb, struct sw_flow_key *key)
+{
+#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
+	struct tc_skb_ext *tc_ext;
+#endif
+	bool post_ct = false, post_ct_snat = false, post_ct_dnat = false;
+	int res, err;
+	u16 zone = 0;
+
+	/* Extract metadata from packet. */
+	if (tun_info) {
+		key->tun_proto = ip_tunnel_info_af(tun_info);
+		memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
+
+		if (tun_info->options_len) {
+			BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) *
+						   8)) - 1
+					> sizeof(key->tun_opts));
+
+			ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len),
+						tun_info);
+			key->tun_opts_len = tun_info->options_len;
+		} else {
+			key->tun_opts_len = 0;
+		}
+	} else  {
+		key->tun_proto = 0;
+		key->tun_opts_len = 0;
+		memset(&key->tun_key, 0, sizeof(key->tun_key));
+	}
+
+	key->phy.priority = skb->priority;
+	key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
+	key->phy.skb_mark = skb->mark;
+	key->ovs_flow_hash = 0;
+	res = key_extract_mac_proto(skb);
+	if (res < 0)
+		return res;
+	key->mac_proto = res;
+
+#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
+	if (tc_skb_ext_tc_enabled()) {
+		tc_ext = skb_ext_find(skb, TC_SKB_EXT);
+		key->recirc_id = tc_ext && !tc_ext->act_miss ?
+				 tc_ext->chain : 0;
+		OVS_CB(skb)->mru = tc_ext ? tc_ext->mru : 0;
+		post_ct = tc_ext ? tc_ext->post_ct : false;
+		post_ct_snat = post_ct ? tc_ext->post_ct_snat : false;
+		post_ct_dnat = post_ct ? tc_ext->post_ct_dnat : false;
+		zone = post_ct ? tc_ext->zone : 0;
+	} else {
+		key->recirc_id = 0;
+	}
+#else
+	key->recirc_id = 0;
+#endif
+
+	err = key_extract(skb, key);
+	if (!err) {
+		ovs_ct_fill_key(skb, key, post_ct);   /* Must be after key_extract(). */
+		if (post_ct) {
+			if (!skb_get_nfct(skb)) {
+				key->ct_zone = zone;
+			} else {
+				if (!post_ct_dnat)
+					key->ct_state &= ~OVS_CS_F_DST_NAT;
+				if (!post_ct_snat)
+					key->ct_state &= ~OVS_CS_F_SRC_NAT;
+			}
+		}
+	}
+	return err;
+}
+
+int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
+				   struct sk_buff *skb,
+				   struct sw_flow_key *key, bool log)
+{
+	const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
+	u64 attrs = 0;
+	int err;
+
+	err = parse_flow_nlattrs(attr, a, &attrs, log);
+	if (err)
+		return -EINVAL;
+
+	/* Extract metadata from netlink attributes. */
+	err = ovs_nla_get_flow_metadata(net, a, attrs, key, log);
+	if (err)
+		return err;
+
+	/* key_extract assumes that skb->protocol is set-up for
+	 * layer 3 packets which is the case for other callers,
+	 * in particular packets received from the network stack.
+	 * Here the correct value can be set from the metadata
+	 * extracted above.
+	 * For L2 packet key eth type would be zero. skb protocol
+	 * would be set to correct value later during key-extact.
+	 */
+
+	skb->protocol = key->eth.type;
+	err = key_extract(skb, key);
+	if (err)
+		return err;
+
+	/* Check that we have conntrack original direction tuple metadata only
+	 * for packets for which it makes sense.  Otherwise the key may be
+	 * corrupted due to overlapping key fields.
+	 */
+	if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) &&
+	    key->eth.type != htons(ETH_P_IP))
+		return -EINVAL;
+	if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) &&
+	    (key->eth.type != htons(ETH_P_IPV6) ||
+	     sw_flow_key_is_nd(key)))
+		return -EINVAL;
+
+	return 0;
+}