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/*
* Copyright (c) 2009, 2010 Nicira Networks.
* Distributed under the terms of the GNU GPL version 2.
*
* Significant portions of this file may be copied from parts of the Linux
* kernel, by Linus Torvalds and others.
*/
#ifndef FLOW_H
#define FLOW_H 1
#include <linux/kernel.h>
#include <linux/netlink.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/rcupdate.h>
#include <linux/if_ether.h>
#include <linux/jiffies.h>
#include <linux/time.h>
#include "openvswitch/datapath-protocol.h"
#include "table.h"
struct sk_buff;
struct sw_flow_actions {
struct rcu_head rcu;
u32 actions_len;
struct nlattr actions[];
};
struct sw_flow_key {
__be64 tun_id; /* Encapsulating tunnel ID. */
__be32 nw_src; /* IP source address. */
__be32 nw_dst; /* IP destination address. */
u16 in_port; /* Input switch port. */
__be16 dl_tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
__be16 dl_type; /* Ethernet frame type. */
__be16 tp_src; /* TCP/UDP source port. */
__be16 tp_dst; /* TCP/UDP destination port. */
u8 dl_src[ETH_ALEN]; /* Ethernet source address. */
u8 dl_dst[ETH_ALEN]; /* Ethernet destination address. */
u8 nw_proto; /* IP protocol or lower 8 bits of ARP opcode. */
u8 nw_tos; /* IP ToS (DSCP field, 6 bits). */
};
struct sw_flow {
struct rcu_head rcu;
struct tbl_node tbl_node;
struct sw_flow_key key;
struct sw_flow_actions __rcu *sf_acts;
atomic_t refcnt;
bool dead;
spinlock_t lock; /* Lock for values below. */
unsigned long used; /* Last used time (in jiffies). */
u64 packet_count; /* Number of packets matched. */
u64 byte_count; /* Number of bytes matched. */
u8 tcp_flags; /* Union of seen TCP flags. */
};
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;
int flow_init(void);
void flow_exit(void);
struct sw_flow *flow_alloc(void);
void flow_deferred_free(struct sw_flow *);
void flow_free_tbl(struct tbl_node *);
struct sw_flow_actions *flow_actions_alloc(u32 actions_len);
void flow_deferred_free_acts(struct sw_flow_actions *);
void flow_hold(struct sw_flow *);
void flow_put(struct sw_flow *);
int flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *, bool *is_frag);
void flow_used(struct sw_flow *, struct sk_buff *);
u32 flow_hash(const struct sw_flow_key *);
int flow_cmp(const struct tbl_node *, void *target);
/* By my calculations currently the longest valid nlattr-formatted flow key is
* 80 bytes long, so this leaves some safety margin.
*/
#define FLOW_BUFSIZE 96
int flow_copy_from_user(struct sw_flow_key *, const struct nlattr __user *ukey, u32 key_len);
int flow_copy_to_user(struct nlattr __user *ukey, const struct sw_flow_key *, u32 key_len);
static inline struct sw_flow *flow_cast(const struct tbl_node *node)
{
return container_of(node, struct sw_flow, tbl_node);
}
#endif /* flow.h */
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