+/* This sequence number should be incremented whenever anything involving flows
+ * or the wildcarding of flows changes. This will cause build assertion
+ * failures in places which likely need to be updated. */
+#define FLOW_WC_SEQ 14
+
+#define FLOW_N_REGS 8
+BUILD_ASSERT_DECL(FLOW_N_REGS <= NXM_NX_MAX_REGS);
+
+/* Used for struct flow's dl_type member for frames that have no Ethernet
+ * type, that is, pure 802.2 frames. */
+#define FLOW_DL_TYPE_NONE 0x5ff
+
+/* Fragment bits, used for IPv4 and IPv6, always zero for non-IP flows. */
+#define FLOW_NW_FRAG_ANY (1 << 0) /* Set for any IP frag. */
+#define FLOW_NW_FRAG_LATER (1 << 1) /* Set for IP frag with nonzero offset. */
+#define FLOW_NW_FRAG_MASK (FLOW_NW_FRAG_ANY | FLOW_NW_FRAG_LATER)
+
+BUILD_ASSERT_DECL(FLOW_NW_FRAG_ANY == NX_IP_FRAG_ANY);
+BUILD_ASSERT_DECL(FLOW_NW_FRAG_LATER == NX_IP_FRAG_LATER);
+
+struct flow {
+ ovs_be64 tun_id; /* Encapsulating tunnel ID. */
+ ovs_be64 metadata; /* OpenFlow Metadata. */
+ struct in6_addr ipv6_src; /* IPv6 source address. */
+ struct in6_addr ipv6_dst; /* IPv6 destination address. */
+ struct in6_addr nd_target; /* IPv6 neighbor discovery (ND) target. */
+ uint32_t skb_priority; /* Packet priority for QoS. */
+ uint32_t regs[FLOW_N_REGS]; /* Registers. */
+ ovs_be32 nw_src; /* IPv4 source address. */
+ ovs_be32 nw_dst; /* IPv4 destination address. */
+ ovs_be32 ipv6_label; /* IPv6 flow label. */
+ uint16_t in_port; /* OpenFlow port number of input port. */
+ ovs_be16 vlan_tci; /* If 802.1Q, TCI | VLAN_CFI; otherwise 0. */
+ ovs_be16 dl_type; /* Ethernet frame type. */
+ ovs_be16 tp_src; /* TCP/UDP source port. */
+ ovs_be16 tp_dst; /* TCP/UDP destination port. */
+ uint8_t dl_src[6]; /* Ethernet source address. */
+ uint8_t dl_dst[6]; /* Ethernet destination address. */
+ uint8_t nw_proto; /* IP protocol or low 8 bits of ARP opcode. */
+ uint8_t nw_tos; /* IP ToS (including DSCP and ECN). */
+ uint8_t arp_sha[6]; /* ARP/ND source hardware address. */
+ uint8_t arp_tha[6]; /* ARP/ND target hardware address. */
+ uint8_t nw_ttl; /* IP TTL/Hop Limit. */
+ uint8_t nw_frag; /* FLOW_FRAG_* flags. */
+ uint8_t reserved[2]; /* Reserved for 64-bit packing. */
+};
+
+/* Represents the metadata fields of struct flow. The masks are used to
+ * indicate which metadata fields are relevant in a given context. Typically
+ * they will be all 1 or all 0. */
+struct flow_metadata {
+ ovs_be64 tun_id; /* Encapsulating tunnel ID. */
+ ovs_be64 tun_id_mask; /* 1-bit in each significant tun_id bit.*/
+
+ ovs_be64 metadata;
+ ovs_be64 metadata_mask;
+
+ uint32_t regs[FLOW_N_REGS]; /* Registers. */
+ uint32_t reg_masks[FLOW_N_REGS]; /* 1-bit in each significant regs bit. */
+
+ uint16_t in_port; /* OpenFlow port or zero. */
+};
+
+/* Assert that there are FLOW_SIG_SIZE bytes of significant data in "struct
+ * flow", followed by FLOW_PAD_SIZE bytes of padding. */
+#define FLOW_SIG_SIZE (118 + FLOW_N_REGS * 4)
+#define FLOW_PAD_SIZE 2
+BUILD_ASSERT_DECL(offsetof(struct flow, nw_frag) == FLOW_SIG_SIZE - 1);
+BUILD_ASSERT_DECL(sizeof(((struct flow *)0)->nw_frag) == 1);
+BUILD_ASSERT_DECL(sizeof(struct flow) == FLOW_SIG_SIZE + FLOW_PAD_SIZE);
+
+/* Remember to update FLOW_WC_SEQ when changing 'struct flow'. */
+BUILD_ASSERT_DECL(FLOW_SIG_SIZE == 150 && FLOW_WC_SEQ == 14);
+
+void flow_extract(struct ofpbuf *, uint32_t priority, ovs_be64 tun_id,
+ uint16_t in_port, struct flow *);
+void flow_zero_wildcards(struct flow *, const struct flow_wildcards *);
+void flow_get_metadata(const struct flow *, struct flow_metadata *);
+
+char *flow_to_string(const struct flow *);
+void flow_format(struct ds *, const struct flow *);
+void flow_print(FILE *, const struct flow *);
+static inline int flow_compare_3way(const struct flow *, const struct flow *);
+static inline bool flow_equal(const struct flow *, const struct flow *);
+static inline size_t flow_hash(const struct flow *, uint32_t basis);
+
+void flow_set_vlan_vid(struct flow *, ovs_be16 vid);
+void flow_set_vlan_pcp(struct flow *, uint8_t pcp);