2 * Copyright (c) 2007-2011 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 #include <linux/kernel.h>
23 #include <linux/netlink.h>
24 #include <linux/openvswitch.h>
25 #include <linux/spinlock.h>
26 #include <linux/types.h>
27 #include <linux/rcupdate.h>
28 #include <linux/if_ether.h>
29 #include <linux/in6.h>
30 #include <linux/jiffies.h>
31 #include <linux/time.h>
32 #include <linux/flex_array.h>
33 #include <net/inet_ecn.h>
37 struct sw_flow_actions {
40 struct nlattr actions[];
46 struct ovs_key_ipv4_tunnel tun_key; /* Encapsulating tunnel key. */
48 u32 priority; /* Packet QoS priority. */
49 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
52 u8 src[ETH_ALEN]; /* Ethernet source address. */
53 u8 dst[ETH_ALEN]; /* Ethernet destination address. */
54 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
55 __be16 type; /* Ethernet frame type. */
58 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
60 u8 ttl; /* IP TTL/hop limit. */
61 u8 frag; /* One of OVS_FRAG_TYPE_*. */
66 __be32 src; /* IP source address. */
67 __be32 dst; /* IP destination address. */
71 __be16 src; /* TCP/UDP source port. */
72 __be16 dst; /* TCP/UDP destination port. */
75 u8 sha[ETH_ALEN]; /* ARP source hardware address. */
76 u8 tha[ETH_ALEN]; /* ARP target hardware address. */
82 struct in6_addr src; /* IPv6 source address. */
83 struct in6_addr dst; /* IPv6 destination address. */
85 __be32 label; /* IPv6 flow label. */
87 __be16 src; /* TCP/UDP source port. */
88 __be16 dst; /* TCP/UDP destination port. */
91 struct in6_addr target; /* ND target address. */
92 u8 sll[ETH_ALEN]; /* ND source link layer address. */
93 u8 tll[ETH_ALEN]; /* ND target link layer address. */
101 struct hlist_node hash_node[2];
104 struct sw_flow_key key;
105 struct sw_flow_actions __rcu *sf_acts;
110 spinlock_t lock; /* Lock for values below. */
111 unsigned long used; /* Last used time (in jiffies). */
112 u64 packet_count; /* Number of packets matched. */
113 u64 byte_count; /* Number of bytes matched. */
114 u8 tcp_flags; /* Union of seen TCP flags. */
117 struct arp_eth_header {
118 __be16 ar_hrd; /* format of hardware address */
119 __be16 ar_pro; /* format of protocol address */
120 unsigned char ar_hln; /* length of hardware address */
121 unsigned char ar_pln; /* length of protocol address */
122 __be16 ar_op; /* ARP opcode (command) */
124 /* Ethernet+IPv4 specific members. */
125 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
126 unsigned char ar_sip[4]; /* sender IP address */
127 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
128 unsigned char ar_tip[4]; /* target IP address */
131 int ovs_flow_init(void);
132 void ovs_flow_exit(void);
134 struct sw_flow *ovs_flow_alloc(void);
135 void ovs_flow_deferred_free(struct sw_flow *);
137 struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *);
138 void ovs_flow_deferred_free_acts(struct sw_flow_actions *);
140 void ovs_flow_hold(struct sw_flow *);
141 void ovs_flow_put(struct sw_flow *);
143 int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
145 void ovs_flow_used(struct sw_flow *, struct sk_buff *);
146 u64 ovs_flow_used_time(unsigned long flow_jiffies);
148 /* Upper bound on the length of a nlattr-formatted flow key. The longest
149 * nlattr-formatted flow key would be:
151 * struct pad nl hdr total
152 * ------ --- ------ -----
153 * OVS_KEY_ATTR_PRIORITY 4 -- 4 8
154 * OVS_KEY_ATTR_TUN_ID 8 -- 4 12
155 * OVS_KEY_ATTR_IPV4_TUNNEL 24 -- 4 28
156 * OVS_KEY_ATTR_IN_PORT 4 -- 4 8
157 * OVS_KEY_ATTR_ETHERNET 12 -- 4 16
158 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (outer VLAN ethertype)
159 * OVS_KEY_ATTR_8021Q 4 -- 4 8
160 * OVS_KEY_ATTR_ENCAP 0 -- 4 4 (VLAN encapsulation)
161 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (inner VLAN ethertype)
162 * OVS_KEY_ATTR_IPV6 40 -- 4 44
163 * OVS_KEY_ATTR_ICMPV6 2 2 4 8
164 * OVS_KEY_ATTR_ND 28 -- 4 32
165 * -------------------------------------------------
168 #define FLOW_BUFSIZE 184
170 int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
171 int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
172 const struct nlattr *);
173 int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, int key_len,
174 const struct nlattr *attr);
176 #define MAX_ACTIONS_BUFSIZE (16 * 1024)
177 #define TBL_MIN_BUCKETS 1024
180 struct flex_array *buckets;
181 unsigned int count, n_buckets;
188 static inline int ovs_flow_tbl_count(struct flow_table *table)
193 static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
195 return (table->count > table->n_buckets);
198 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
199 struct sw_flow_key *key, int len);
200 void ovs_flow_tbl_destroy(struct flow_table *table);
201 void ovs_flow_tbl_deferred_destroy(struct flow_table *table);
202 struct flow_table *ovs_flow_tbl_alloc(int new_size);
203 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table);
204 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table);
205 void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
206 struct sw_flow_key *key, int key_len);
207 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
209 struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
210 extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];