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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/openvswitch.h>
15 #include <linux/spinlock.h>
16 #include <linux/types.h>
17 #include <linux/rcupdate.h>
18 #include <linux/if_ether.h>
19 #include <linux/in6.h>
20 #include <linux/jiffies.h>
21 #include <linux/time.h>
22 #include <linux/flex_array.h>
26 struct sw_flow_actions
{
29 struct nlattr actions
[];
34 __be64 tun_id
; /* Encapsulating tunnel ID. */
35 u16 in_port
; /* Input switch port (or USHRT_MAX). */
36 u8 src
[ETH_ALEN
]; /* Ethernet source address. */
37 u8 dst
[ETH_ALEN
]; /* Ethernet destination address. */
38 __be16 tci
; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
39 __be16 type
; /* Ethernet frame type. */
42 u8 proto
; /* IP protocol or lower 8 bits of ARP opcode. */
43 u8 tos
; /* IP ToS (DSCP field, 6 bits). */
48 __be32 src
; /* IP source address. */
49 __be32 dst
; /* IP destination address. */
53 __be16 src
; /* TCP/UDP source port. */
54 __be16 dst
; /* TCP/UDP destination port. */
57 u8 sha
[ETH_ALEN
]; /* ARP source hardware address. */
58 u8 tha
[ETH_ALEN
]; /* ARP target hardware address. */
64 struct in6_addr src
; /* IPv6 source address. */
65 struct in6_addr dst
; /* IPv6 destination address. */
68 __be16 src
; /* TCP/UDP source port. */
69 __be16 dst
; /* TCP/UDP destination port. */
72 struct in6_addr target
; /* ND target address. */
73 u8 sll
[ETH_ALEN
]; /* ND source link layer address. */
74 u8 tll
[ETH_ALEN
]; /* ND target link layer address. */
82 struct hlist_node hash_node
;
85 struct sw_flow_key key
;
86 struct sw_flow_actions __rcu
*sf_acts
;
91 spinlock_t lock
; /* Lock for values below. */
92 unsigned long used
; /* Last used time (in jiffies). */
93 u64 packet_count
; /* Number of packets matched. */
94 u64 byte_count
; /* Number of bytes matched. */
95 u8 tcp_flags
; /* Union of seen TCP flags. */
100 __be16 ar_hrd
; /* format of hardware address */
101 __be16 ar_pro
; /* format of protocol address */
102 unsigned char ar_hln
; /* length of hardware address */
103 unsigned char ar_pln
; /* length of protocol address */
104 __be16 ar_op
; /* ARP opcode (command) */
106 /* Ethernet+IPv4 specific members. */
107 unsigned char ar_sha
[ETH_ALEN
]; /* sender hardware address */
108 unsigned char ar_sip
[4]; /* sender IP address */
109 unsigned char ar_tha
[ETH_ALEN
]; /* target hardware address */
110 unsigned char ar_tip
[4]; /* target IP address */
114 void flow_exit(void);
116 struct sw_flow
*flow_alloc(void);
117 void flow_deferred_free(struct sw_flow
*);
119 struct sw_flow_actions
*flow_actions_alloc(const struct nlattr
*);
120 void flow_deferred_free_acts(struct sw_flow_actions
*);
122 void flow_hold(struct sw_flow
*);
123 void flow_put(struct sw_flow
*);
125 int flow_extract(struct sk_buff
*, u16 in_port
, struct sw_flow_key
*,
126 int *key_lenp
, bool *is_frag
);
127 void flow_used(struct sw_flow
*, struct sk_buff
*);
128 u64
flow_used_time(unsigned long flow_jiffies
);
130 /* Upper bound on the length of a nlattr-formatted flow key. The longest
131 * nlattr-formatted flow key would be:
133 * struct pad nl hdr total
134 * ------ --- ------ -----
135 * OVS_KEY_ATTR_TUN_ID 8 -- 4 12
136 * OVS_KEY_ATTR_IN_PORT 4 -- 4 8
137 * OVS_KEY_ATTR_ETHERNET 12 -- 4 16
138 * OVS_KEY_ATTR_8021Q 4 -- 4 8
139 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8
140 * OVS_KEY_ATTR_IPV6 34 2 4 40
141 * OVS_KEY_ATTR_ICMPV6 2 2 4 8
142 * OVS_KEY_ATTR_ND 28 -- 4 32
143 * -------------------------------------------------
146 #define FLOW_BUFSIZE 132
148 int flow_to_nlattrs(const struct sw_flow_key
*, struct sk_buff
*);
149 int flow_from_nlattrs(struct sw_flow_key
*swkey
, int *key_lenp
,
150 const struct nlattr
*);
151 int flow_metadata_from_nlattrs(u16
*in_port
, __be64
*tun_id
,
152 const struct nlattr
*);
154 #define TBL_MIN_BUCKETS 1024
157 struct flex_array
*buckets
;
158 unsigned int count
, n_buckets
;
162 static inline int flow_tbl_count(struct flow_table
*table
)
167 static inline int flow_tbl_need_to_expand(struct flow_table
*table
)
169 return (table
->count
> table
->n_buckets
);
172 struct sw_flow
*flow_tbl_lookup(struct flow_table
*table
,
173 struct sw_flow_key
*key
, int len
);
174 void flow_tbl_destroy(struct flow_table
*table
);
175 void flow_tbl_deferred_destroy(struct flow_table
*table
);
176 struct flow_table
*flow_tbl_alloc(int new_size
);
177 struct flow_table
*flow_tbl_expand(struct flow_table
*table
);
178 void flow_tbl_insert(struct flow_table
*table
, struct sw_flow
*flow
);
179 void flow_tbl_remove(struct flow_table
*table
, struct sw_flow
*flow
);
180 u32
flow_hash(const struct sw_flow_key
*key
, int key_len
);
182 struct sw_flow
*flow_tbl_next(struct flow_table
*table
, u32
*bucket
, u32
*idx
);