mirror of
https://github.com/openvswitch/ovs
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112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
/*
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* Copyright (c) 2009, 2010, 2011 Nicira Networks.
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* Distributed under the terms of the GNU GPL version 2.
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*
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* Significant portions of this file may be copied from parts of the Linux
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* kernel, by Linus Torvalds and others.
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*/
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#ifndef FLOW_H
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#define FLOW_H 1
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#include <linux/kernel.h>
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#include <linux/netlink.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/rcupdate.h>
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#include <linux/if_ether.h>
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#include <linux/jiffies.h>
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#include <linux/time.h>
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#include "openvswitch/datapath-protocol.h"
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#include "table.h"
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struct sk_buff;
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struct sw_flow_actions {
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struct rcu_head rcu;
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u32 actions_len;
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struct nlattr actions[];
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};
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struct sw_flow_key {
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__be64 tun_id; /* Encapsulating tunnel ID. */
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__be32 nw_src; /* IP source address. */
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__be32 nw_dst; /* IP destination address. */
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u16 in_port; /* Input switch port. */
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__be16 dl_tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
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__be16 dl_type; /* Ethernet frame type. */
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__be16 tp_src; /* TCP/UDP source port. */
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__be16 tp_dst; /* TCP/UDP destination port. */
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u8 dl_src[ETH_ALEN]; /* Ethernet source address. */
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u8 dl_dst[ETH_ALEN]; /* Ethernet destination address. */
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u8 nw_proto; /* IP protocol or lower 8 bits of ARP opcode. */
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u8 nw_tos; /* IP ToS (DSCP field, 6 bits). */
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};
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struct sw_flow {
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struct rcu_head rcu;
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struct tbl_node tbl_node;
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struct sw_flow_key key;
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struct sw_flow_actions __rcu *sf_acts;
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atomic_t refcnt;
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bool dead;
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spinlock_t lock; /* Lock for values below. */
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unsigned long used; /* Last used time (in jiffies). */
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u64 packet_count; /* Number of packets matched. */
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u64 byte_count; /* Number of bytes matched. */
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u8 tcp_flags; /* Union of seen TCP flags. */
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};
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struct arp_eth_header
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{
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__be16 ar_hrd; /* format of hardware address */
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__be16 ar_pro; /* format of protocol address */
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unsigned char ar_hln; /* length of hardware address */
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unsigned char ar_pln; /* length of protocol address */
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__be16 ar_op; /* ARP opcode (command) */
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/* Ethernet+IPv4 specific members. */
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unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
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unsigned char ar_sip[4]; /* sender IP address */
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unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
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unsigned char ar_tip[4]; /* target IP address */
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} __packed;
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int flow_init(void);
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void flow_exit(void);
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struct sw_flow *flow_alloc(void);
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void flow_deferred_free(struct sw_flow *);
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void flow_free_tbl(struct tbl_node *);
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struct sw_flow_actions *flow_actions_alloc(u32 actions_len);
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void flow_deferred_free_acts(struct sw_flow_actions *);
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void flow_hold(struct sw_flow *);
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void flow_put(struct sw_flow *);
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int flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *, bool *is_frag);
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void flow_used(struct sw_flow *, struct sk_buff *);
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u32 flow_hash(const struct sw_flow_key *);
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int flow_cmp(const struct tbl_node *, void *target);
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/* By my calculations currently the longest valid nlattr-formatted flow key is
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* 80 bytes long, so this leaves some safety margin.
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*/
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#define FLOW_BUFSIZE 96
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int flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
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int flow_from_nlattrs(struct sw_flow_key *swkey, const struct nlattr *);
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static inline struct sw_flow *flow_cast(const struct tbl_node *node)
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{
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return container_of(node, struct sw_flow, tbl_node);
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}
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#endif /* flow.h */
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