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>
23 #include <net/inet_ecn.h>
27 struct sw_flow_actions {
30 struct nlattr actions[];
35 __be64 tun_id; /* Encapsulating tunnel ID. */
36 u32 priority; /* Packet QoS priority. */
37 u16 in_port; /* Input switch port (or USHRT_MAX). */
40 u8 src[ETH_ALEN]; /* Ethernet source address. */
41 u8 dst[ETH_ALEN]; /* Ethernet destination address. */
42 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
43 __be16 type; /* Ethernet frame type. */
46 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
48 u8 ttl; /* IP TTL/hop limit. */
49 u8 frag; /* One of OVS_FRAG_TYPE_*. */
54 __be32 src; /* IP source address. */
55 __be32 dst; /* IP destination address. */
59 __be16 src; /* TCP/UDP source port. */
60 __be16 dst; /* TCP/UDP destination port. */
63 u8 sha[ETH_ALEN]; /* ARP source hardware address. */
64 u8 tha[ETH_ALEN]; /* ARP target hardware address. */
70 struct in6_addr src; /* IPv6 source address. */
71 struct in6_addr dst; /* IPv6 destination address. */
73 __be32 label; /* IPv6 flow label. */
75 __be16 src; /* TCP/UDP source port. */
76 __be16 dst; /* TCP/UDP destination port. */
79 struct in6_addr target; /* ND target address. */
80 u8 sll[ETH_ALEN]; /* ND source link layer address. */
81 u8 tll[ETH_ALEN]; /* ND target link layer address. */
89 struct hlist_node hash_node;
92 struct sw_flow_key key;
93 struct sw_flow_actions __rcu *sf_acts;
98 spinlock_t lock; /* Lock for values below. */
99 unsigned long used; /* Last used time (in jiffies). */
100 u64 packet_count; /* Number of packets matched. */
101 u64 byte_count; /* Number of bytes matched. */
102 u8 tcp_flags; /* Union of seen TCP flags. */
105 struct arp_eth_header {
106 __be16 ar_hrd; /* format of hardware address */
107 __be16 ar_pro; /* format of protocol address */
108 unsigned char ar_hln; /* length of hardware address */
109 unsigned char ar_pln; /* length of protocol address */
110 __be16 ar_op; /* ARP opcode (command) */
112 /* Ethernet+IPv4 specific members. */
113 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
114 unsigned char ar_sip[4]; /* sender IP address */
115 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
116 unsigned char ar_tip[4]; /* target IP address */
120 void flow_exit(void);
122 struct sw_flow *flow_alloc(void);
123 void flow_deferred_free(struct sw_flow *);
125 struct sw_flow_actions *flow_actions_alloc(const struct nlattr *);
126 void flow_deferred_free_acts(struct sw_flow_actions *);
128 void flow_hold(struct sw_flow *);
129 void flow_put(struct sw_flow *);
131 int flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
133 void flow_used(struct sw_flow *, struct sk_buff *);
134 u64 flow_used_time(unsigned long flow_jiffies);
136 /* Upper bound on the length of a nlattr-formatted flow key. The longest
137 * nlattr-formatted flow key would be:
139 * struct pad nl hdr total
140 * ------ --- ------ -----
141 * OVS_KEY_ATTR_PRIORITY 4 -- 4 8
142 * OVS_KEY_ATTR_TUN_ID 8 -- 4 12
143 * OVS_KEY_ATTR_IN_PORT 4 -- 4 8
144 * OVS_KEY_ATTR_ETHERNET 12 -- 4 16
145 * OVS_KEY_ATTR_8021Q 4 -- 4 8
146 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8
147 * OVS_KEY_ATTR_IPV6 40 -- 4 44
148 * OVS_KEY_ATTR_ICMPV6 2 2 4 8
149 * OVS_KEY_ATTR_ND 28 -- 4 32
150 * -------------------------------------------------
153 #define FLOW_BUFSIZE 144
155 int flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
156 int flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
157 const struct nlattr *);
158 int flow_metadata_from_nlattrs(u32 *priority, u16 *in_port, __be64 *tun_id,
159 const struct nlattr *);
161 #define TBL_MIN_BUCKETS 1024
164 struct flex_array *buckets;
165 unsigned int count, n_buckets;
169 static inline int flow_tbl_count(struct flow_table *table)
174 static inline int flow_tbl_need_to_expand(struct flow_table *table)
176 return (table->count > table->n_buckets);
179 struct sw_flow *flow_tbl_lookup(struct flow_table *table,
180 struct sw_flow_key *key, int len);
181 void flow_tbl_destroy(struct flow_table *table);
182 void flow_tbl_deferred_destroy(struct flow_table *table);
183 struct flow_table *flow_tbl_alloc(int new_size);
184 struct flow_table *flow_tbl_expand(struct flow_table *table);
185 void flow_tbl_insert(struct flow_table *table, struct sw_flow *flow);
186 void flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
187 u32 flow_hash(const struct sw_flow_key *key, int key_len);
189 struct sw_flow *flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
190 extern const u32 ovs_key_lens[OVS_KEY_ATTR_MAX + 1];