/* * Copyright (c) 2007-2017 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 */ #ifndef FLOW_H#define FLOW_H 1 #include <linux/cache.h>#include <linux/kernel.h>#include <linux/netlink.h>#include <linux/openvswitch.h>#include <linux/spinlock.h>#include <linux/types.h>#include <linux/rcupdate.h>#include <linux/if_ether.h>#include <linux/in6.h>#include <linux/jiffies.h>#include <linux/time.h>#include <linux/flex_array.h>#include <net/inet_ecn.h>#include <net/ip_tunnels.h>#include <net/dst_metadata.h> struct sk_buff; enum sw_flow_mac_proto {	MAC_PROTO_NONE = 0,	MAC_PROTO_ETHERNET,};#define SW_FLOW_KEY_INVALID	0x80 /* Store options at the end of the array if they are less than the * maximum size. This allows us to get the benefits of variable length * matching for small options. */#define TUN_METADATA_OFFSET(opt_len) \	(FIELD_SIZEOF(struct sw_flow_key, tun_opts) - opt_len)#define TUN_METADATA_OPTS(flow_key, opt_len) \	((void *)((flow_key)->tun_opts + TUN_METADATA_OFFSET(opt_len))) struct ovs_tunnel_info {	struct metadata_dst	*tun_dst;}; struct vlan_head {	__be16 tpid; /* Vlan type. Generally 802.1q or 802.1ad.*/	__be16 tci;  /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */}; #define OVS_SW_FLOW_KEY_METADATA_SIZE			\	(offsetof(struct sw_flow_key, recirc_id) +	\	FIELD_SIZEOF(struct sw_flow_key, recirc_id)) struct sw_flow_key {	u8 tun_opts[IP_TUNNEL_OPTS_MAX];	u8 tun_opts_len;	struct ip_tunnel_key tun_key;	/* Encapsulating tunnel key. */	struct {		u32	priority;	/* Packet QoS priority. */		u32	skb_mark;	/* SKB mark. */		u16	in_port;	/* Input switch port (or DP_MAX_PORTS). */	} __packed phy; /* Safe when right after 'tun_key'. */	u8 mac_proto;			/* MAC layer protocol (e.g. Ethernet). */	u8 tun_proto;			/* Protocol of encapsulating tunnel. */	u32 ovs_flow_hash;		/* Datapath computed hash value.  */	u32 recirc_id;			/* Recirculation ID.  */	struct {		u8     src[ETH_ALEN];	/* Ethernet source address. */		u8     dst[ETH_ALEN];	/* Ethernet destination address. */		struct vlan_head vlan;		struct vlan_head cvlan;		__be16 type;		/* Ethernet frame type. */	} eth;	/* Filling a hole of two bytes. */	u8 ct_state;	u8 ct_orig_proto;		/* CT original direction tuple IP					 * protocol.					 */	union {		struct {			__be32 top_lse;	/* top label stack entry */		} mpls;		struct {			u8     proto;	/* IP protocol or lower 8 bits of ARP opcode. */			u8     tos;	    /* IP ToS. */			u8     ttl;	    /* IP TTL/hop limit. */			u8     frag;	/* One of OVS_FRAG_TYPE_*. */		} ip;	};	u16 ct_zone;			/* Conntrack zone. */	struct {		__be16 src;		/* TCP/UDP/SCTP source port. */		__be16 dst;		/* TCP/UDP/SCTP destination port. */		__be16 flags;		/* TCP flags. */	} tp;	union {		struct {			struct {				__be32 src;	/* IP source address. */				__be32 dst;	/* IP destination address. */			} addr;			union {				struct {					__be32 src;					__be32 dst;				} ct_orig;	/* Conntrack original direction fields. */				struct {					u8 sha[ETH_ALEN];	/* ARP source hardware address. */					u8 tha[ETH_ALEN];	/* ARP target hardware address. */				} arp;			};		} ipv4;		struct {			struct {				struct in6_addr src;	/* IPv6 source address. */				struct in6_addr dst;	/* IPv6 destination address. */			} addr;			__be32 label;			/* IPv6 flow label. */			union {				struct {					struct in6_addr src;					struct in6_addr dst;				} ct_orig;	/* Conntrack original direction fields. */				struct {					struct in6_addr target;	/* ND target address. */					u8 sll[ETH_ALEN];	/* ND source link layer address. */					u8 tll[ETH_ALEN];	/* ND target link layer address. */				} nd;			};		} ipv6;	};	struct {		/* Connection tracking fields not packed above. */		struct {			__be16 src;	/* CT orig tuple tp src port. */			__be16 dst;	/* CT orig tuple tp dst port. */		} orig_tp;		u32 mark;		struct ovs_key_ct_labels labels;	} ct; } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */ static inline bool sw_flow_key_is_nd(const struct sw_flow_key *key){	return key->eth.type == htons(ETH_P_IPV6) &&		key->ip.proto == NEXTHDR_ICMP &&		key->tp.dst == 0 &&		(key->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||		 key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT));} struct sw_flow_key_range {	unsigned short int start;	unsigned short int end;}; struct sw_flow_mask {	int ref_count;	struct rcu_head rcu;	struct list_head list;	struct sw_flow_key_range range;	struct sw_flow_key key;}; struct sw_flow_match {	struct sw_flow_key *key;	struct sw_flow_key_range range;	struct sw_flow_mask *mask;}; #define MAX_UFID_LENGTH 16 /* 128 bits */ struct sw_flow_id {	u32 ufid_len;	union {		u32 ufid[MAX_UFID_LENGTH / 4];		struct sw_flow_key *unmasked_key;	};}; struct sw_flow_actions {	struct rcu_head rcu;	size_t orig_len;	/* From flow_cmd_new netlink actions size */	u32 actions_len;	struct nlattr actions[];}; struct flow_stats {	u64 packet_count;		/* Number of packets matched. */	u64 byte_count;			/* Number of bytes matched. */	unsigned long used;		/* Last used time (in jiffies). */	spinlock_t lock;		/* Lock for atomic stats update. */	__be16 tcp_flags;		/* Union of seen TCP flags. */}; struct sw_flow {	struct rcu_head rcu;	struct {		struct hlist_node node[2];		u32 hash;	} flow_table, ufid_table;	int stats_last_writer;		/* CPU id of the last writer on					 * 'stats[0]'.					 */	struct sw_flow_key key;	struct sw_flow_id id;	struct sw_flow_mask *mask;	struct sw_flow_actions __rcu *sf_acts;	struct flow_stats __rcu *stats[]; /* One for each CPU.  First one					   * is allocated at flow creation time,					   * the rest are allocated on demand					   * while holding the 'stats[0].lock'.					   */}; struct arp_eth_header {	__be16      ar_hrd;	/* format of hardware address   */	__be16      ar_pro;	/* format of protocol address   */	unsigned char   ar_hln;	/* length of hardware address   */	unsigned char   ar_pln;	/* length of protocol address   */	__be16      ar_op;	/* ARP opcode (command)     */ 	/* Ethernet+IPv4 specific members. */	unsigned char       ar_sha[ETH_ALEN];	/* sender hardware address  */	unsigned char       ar_sip[4];		/* sender IP address        */	unsigned char       ar_tha[ETH_ALEN];	/* target hardware address  */	unsigned char       ar_tip[4];		/* target IP address        */} __packed; static inline u8 ovs_key_mac_proto(const struct sw_flow_key *key){	return key->mac_proto & ~SW_FLOW_KEY_INVALID;} static inline u16 __ovs_mac_header_len(u8 mac_proto){	return mac_proto == MAC_PROTO_ETHERNET ? ETH_HLEN : 0;} static inline u16 ovs_mac_header_len(const struct sw_flow_key *key){	return __ovs_mac_header_len(ovs_key_mac_proto(key));} static inline bool ovs_identifier_is_ufid(const struct sw_flow_id *sfid){	return sfid->ufid_len;} static inline bool ovs_identifier_is_key(const struct sw_flow_id *sfid){	return !ovs_identifier_is_ufid(sfid);} void ovs_flow_stats_update(struct sw_flow *, __be16 tcp_flags,			   const struct sk_buff *);void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,			unsigned long *used, __be16 *tcp_flags);void ovs_flow_stats_clear(struct sw_flow *);u64 ovs_flow_used_time(unsigned long flow_jiffies); int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key);int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,			 struct sk_buff *skb,			 struct sw_flow_key *key);/* Extract key from packet coming from userspace. */int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,				   struct sk_buff *skb,				   struct sw_flow_key *key, bool log); #endif /* flow.h */