2 * Copyright (c) 2009, 2010, 2011 Nicira Networks.
3 * Distributed under the terms of the GNU GPL version 2.
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
12 #include <linux/kernel.h>
13 #include <linux/netlink.h>
14 #include <linux/spinlock.h>
15 #include <linux/types.h>
16 #include <linux/rcupdate.h>
17 #include <linux/if_ether.h>
18 #include <linux/jiffies.h>
19 #include <linux/time.h>
21 #include "openvswitch/datapath-protocol.h"
26 struct sw_flow_actions {
29 struct nlattr actions[];
33 __be64 tun_id; /* Encapsulating tunnel ID. */
36 __be32 ipv4_src; /* IPv4 source address. */
37 __be32 ipv4_dst; /* IPv4 destination address. */
40 __be32 ipv6_src[4]; /* IPv6 source address. */
41 __be32 ipv6_dst[4]; /* IPv6 source address. */
44 u16 in_port; /* Input switch port. */
45 __be16 dl_tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
46 __be16 dl_type; /* Ethernet frame type. */
47 __be16 tp_src; /* TCP/UDP source port. */
48 __be16 tp_dst; /* TCP/UDP destination port. */
49 u8 dl_src[ETH_ALEN]; /* Ethernet source address. */
50 u8 dl_dst[ETH_ALEN]; /* Ethernet destination address. */
51 u8 nw_proto; /* IP protocol or lower 8 bits of ARP opcode. */
52 u8 nw_tos; /* IP ToS (DSCP field, 6 bits). */
53 u8 arp_sha[ETH_ALEN]; /* ARP source hardware address. */
54 u8 arp_tha[ETH_ALEN]; /* ARP target hardware address. */
59 struct tbl_node tbl_node;
61 struct sw_flow_key key;
62 struct sw_flow_actions __rcu *sf_acts;
67 spinlock_t lock; /* Lock for values below. */
68 unsigned long used; /* Last used time (in jiffies). */
69 u64 packet_count; /* Number of packets matched. */
70 u64 byte_count; /* Number of bytes matched. */
71 u8 tcp_flags; /* Union of seen TCP flags. */
76 __be16 ar_hrd; /* format of hardware address */
77 __be16 ar_pro; /* format of protocol address */
78 unsigned char ar_hln; /* length of hardware address */
79 unsigned char ar_pln; /* length of protocol address */
80 __be16 ar_op; /* ARP opcode (command) */
82 /* Ethernet+IPv4 specific members. */
83 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
84 unsigned char ar_sip[4]; /* sender IP address */
85 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
86 unsigned char ar_tip[4]; /* target IP address */
92 struct sw_flow *flow_alloc(void);
93 void flow_deferred_free(struct sw_flow *);
94 void flow_free_tbl(struct tbl_node *);
96 struct sw_flow_actions *flow_actions_alloc(const struct nlattr *);
97 void flow_deferred_free_acts(struct sw_flow_actions *);
99 void flow_hold(struct sw_flow *);
100 void flow_put(struct sw_flow *);
102 int flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *, bool *is_frag);
103 void flow_used(struct sw_flow *, struct sk_buff *);
104 u64 flow_used_time(unsigned long flow_jiffies);
106 u32 flow_hash(const struct sw_flow_key *);
107 int flow_cmp(const struct tbl_node *, void *target);
109 /* By my calculations currently the longest valid nlattr-formatted flow key is
110 * 80 bytes long, so this leaves some safety margin.
112 #define FLOW_BUFSIZE 96
114 int flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
115 int flow_from_nlattrs(struct sw_flow_key *swkey, const struct nlattr *);
117 static inline struct sw_flow *flow_cast(const struct tbl_node *node)
119 return container_of(node, struct sw_flow, tbl_node);