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[];
33 /* Mask for the OVS_FRAG_TYPE_* value in the low 2 bits of ip.tos_frag in
34 * struct sw_flow_key. */
35 #define OVS_FRAG_TYPE_MASK INET_ECN_MASK
39 __be64 tun_id; /* Encapsulating tunnel ID. */
40 u32 priority; /* Packet QoS priority. */
41 u16 in_port; /* Input switch port (or USHRT_MAX). */
44 u8 src[ETH_ALEN]; /* Ethernet source address. */
45 u8 dst[ETH_ALEN]; /* Ethernet destination address. */
46 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
47 __be16 type; /* Ethernet frame type. */
50 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
51 u8 tos_frag; /* IP ToS DSCP in high 6 bits,
52 * OVS_FRAG_TYPE_* in low 2 bits. */
57 __be32 src; /* IP source address. */
58 __be32 dst; /* IP destination address. */
62 __be16 src; /* TCP/UDP source port. */
63 __be16 dst; /* TCP/UDP destination port. */
66 u8 sha[ETH_ALEN]; /* ARP source hardware address. */
67 u8 tha[ETH_ALEN]; /* ARP target hardware address. */
73 struct in6_addr src; /* IPv6 source address. */
74 struct in6_addr dst; /* IPv6 destination address. */
76 __be32 label; /* IPv6 flow label. */
78 __be16 src; /* TCP/UDP source port. */
79 __be16 dst; /* TCP/UDP destination port. */
82 struct in6_addr target; /* ND target address. */
83 u8 sll[ETH_ALEN]; /* ND source link layer address. */
84 u8 tll[ETH_ALEN]; /* ND target link layer address. */
92 struct hlist_node hash_node;
95 struct sw_flow_key key;
96 struct sw_flow_actions __rcu *sf_acts;
101 spinlock_t lock; /* Lock for values below. */
102 unsigned long used; /* Last used time (in jiffies). */
103 u64 packet_count; /* Number of packets matched. */
104 u64 byte_count; /* Number of bytes matched. */
105 u8 tcp_flags; /* Union of seen TCP flags. */
108 struct arp_eth_header {
109 __be16 ar_hrd; /* format of hardware address */
110 __be16 ar_pro; /* format of protocol address */
111 unsigned char ar_hln; /* length of hardware address */
112 unsigned char ar_pln; /* length of protocol address */
113 __be16 ar_op; /* ARP opcode (command) */
115 /* Ethernet+IPv4 specific members. */
116 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
117 unsigned char ar_sip[4]; /* sender IP address */
118 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
119 unsigned char ar_tip[4]; /* target IP address */
123 void flow_exit(void);
125 struct sw_flow *flow_alloc(void);
126 void flow_deferred_free(struct sw_flow *);
128 struct sw_flow_actions *flow_actions_alloc(const struct nlattr *);
129 void flow_deferred_free_acts(struct sw_flow_actions *);
131 void flow_hold(struct sw_flow *);
132 void flow_put(struct sw_flow *);
134 int flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
136 void flow_used(struct sw_flow *, struct sk_buff *);
137 u64 flow_used_time(unsigned long flow_jiffies);
139 /* Upper bound on the length of a nlattr-formatted flow key. The longest
140 * nlattr-formatted flow key would be:
142 * struct pad nl hdr total
143 * ------ --- ------ -----
144 * OVS_KEY_ATTR_PRIORITY 4 -- 4 8
145 * OVS_KEY_ATTR_TUN_ID 8 -- 4 12
146 * OVS_KEY_ATTR_IN_PORT 4 -- 4 8
147 * OVS_KEY_ATTR_ETHERNET 12 -- 4 16
148 * OVS_KEY_ATTR_8021Q 4 -- 4 8
149 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8
150 * OVS_KEY_ATTR_IPV6 38 2 4 44
151 * OVS_KEY_ATTR_ICMPV6 2 2 4 8
152 * OVS_KEY_ATTR_ND 28 -- 4 32
153 * -------------------------------------------------
156 #define FLOW_BUFSIZE 144
158 int flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
159 int flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
160 const struct nlattr *);
161 int flow_metadata_from_nlattrs(u32 *priority, u16 *in_port, __be64 *tun_id,
162 const struct nlattr *);
164 #define TBL_MIN_BUCKETS 1024
167 struct flex_array *buckets;
168 unsigned int count, n_buckets;
172 static inline int flow_tbl_count(struct flow_table *table)
177 static inline int flow_tbl_need_to_expand(struct flow_table *table)
179 return (table->count > table->n_buckets);
182 struct sw_flow *flow_tbl_lookup(struct flow_table *table,
183 struct sw_flow_key *key, int len);
184 void flow_tbl_destroy(struct flow_table *table);
185 void flow_tbl_deferred_destroy(struct flow_table *table);
186 struct flow_table *flow_tbl_alloc(int new_size);
187 struct flow_table *flow_tbl_expand(struct flow_table *table);
188 void flow_tbl_insert(struct flow_table *table, struct sw_flow *flow);
189 void flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
190 u32 flow_hash(const struct sw_flow_key *key, int key_len);
192 struct sw_flow *flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
193 extern const u32 ovs_key_lens[OVS_KEY_ATTR_MAX + 1];