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Jesse Grossccb13522011-10-25 19:26:31 -07001/*
Raju Subramaniancaf2ee12012-05-03 18:55:23 -07002 * Copyright (c) 2007-2011 Nicira, Inc.
Jesse Grossccb13522011-10-25 19:26:31 -07003 *
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.
7 *
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.
12 *
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
16 * 02110-1301, USA
17 */
18
19#ifndef FLOW_H
20#define FLOW_H 1
21
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>
34
35struct sk_buff;
36
37struct sw_flow_actions {
38 struct rcu_head rcu;
39 u32 actions_len;
40 struct nlattr actions[];
41};
42
43struct sw_flow_key {
44 struct {
45 u32 priority; /* Packet QoS priority. */
Ansis Atteka39c7caeb2012-11-26 11:24:11 -080046 u32 skb_mark; /* SKB mark. */
Pravin B Shelar15eac2a2012-08-23 12:40:54 -070047 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
Jesse Grossccb13522011-10-25 19:26:31 -070048 } phy;
49 struct {
50 u8 src[ETH_ALEN]; /* Ethernet source address. */
51 u8 dst[ETH_ALEN]; /* Ethernet destination address. */
52 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
53 __be16 type; /* Ethernet frame type. */
54 } eth;
55 struct {
56 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
57 u8 tos; /* IP ToS. */
58 u8 ttl; /* IP TTL/hop limit. */
59 u8 frag; /* One of OVS_FRAG_TYPE_*. */
60 } ip;
61 union {
62 struct {
63 struct {
64 __be32 src; /* IP source address. */
65 __be32 dst; /* IP destination address. */
66 } addr;
67 union {
68 struct {
69 __be16 src; /* TCP/UDP source port. */
70 __be16 dst; /* TCP/UDP destination port. */
71 } tp;
72 struct {
73 u8 sha[ETH_ALEN]; /* ARP source hardware address. */
74 u8 tha[ETH_ALEN]; /* ARP target hardware address. */
75 } arp;
76 };
77 } ipv4;
78 struct {
79 struct {
80 struct in6_addr src; /* IPv6 source address. */
81 struct in6_addr dst; /* IPv6 destination address. */
82 } addr;
83 __be32 label; /* IPv6 flow label. */
84 struct {
85 __be16 src; /* TCP/UDP source port. */
86 __be16 dst; /* TCP/UDP destination port. */
87 } tp;
88 struct {
89 struct in6_addr target; /* ND target address. */
90 u8 sll[ETH_ALEN]; /* ND source link layer address. */
91 u8 tll[ETH_ALEN]; /* ND target link layer address. */
92 } nd;
93 } ipv6;
94 };
95};
96
97struct sw_flow {
98 struct rcu_head rcu;
99 struct hlist_node hash_node[2];
100 u32 hash;
101
102 struct sw_flow_key key;
103 struct sw_flow_actions __rcu *sf_acts;
104
105 spinlock_t lock; /* Lock for values below. */
106 unsigned long used; /* Last used time (in jiffies). */
107 u64 packet_count; /* Number of packets matched. */
108 u64 byte_count; /* Number of bytes matched. */
109 u8 tcp_flags; /* Union of seen TCP flags. */
110};
111
112struct arp_eth_header {
113 __be16 ar_hrd; /* format of hardware address */
114 __be16 ar_pro; /* format of protocol address */
115 unsigned char ar_hln; /* length of hardware address */
116 unsigned char ar_pln; /* length of protocol address */
117 __be16 ar_op; /* ARP opcode (command) */
118
119 /* Ethernet+IPv4 specific members. */
120 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
121 unsigned char ar_sip[4]; /* sender IP address */
122 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
123 unsigned char ar_tip[4]; /* target IP address */
124} __packed;
125
126int ovs_flow_init(void);
127void ovs_flow_exit(void);
128
129struct sw_flow *ovs_flow_alloc(void);
130void ovs_flow_deferred_free(struct sw_flow *);
131void ovs_flow_free(struct sw_flow *flow);
132
133struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *);
134void ovs_flow_deferred_free_acts(struct sw_flow_actions *);
135
136int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
137 int *key_lenp);
138void ovs_flow_used(struct sw_flow *, struct sk_buff *);
139u64 ovs_flow_used_time(unsigned long flow_jiffies);
140
141/* Upper bound on the length of a nlattr-formatted flow key. The longest
142 * nlattr-formatted flow key would be:
143 *
144 * struct pad nl hdr total
145 * ------ --- ------ -----
146 * OVS_KEY_ATTR_PRIORITY 4 -- 4 8
147 * OVS_KEY_ATTR_IN_PORT 4 -- 4 8
Ansis Atteka39c7caeb2012-11-26 11:24:11 -0800148 * OVS_KEY_ATTR_SKB_MARK 4 -- 4 8
Jesse Grossccb13522011-10-25 19:26:31 -0700149 * OVS_KEY_ATTR_ETHERNET 12 -- 4 16
Jesse Grossc303aa92012-09-03 19:06:27 -0700150 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (outer VLAN ethertype)
Jesse Grossccb13522011-10-25 19:26:31 -0700151 * OVS_KEY_ATTR_8021Q 4 -- 4 8
Jesse Grossc303aa92012-09-03 19:06:27 -0700152 * OVS_KEY_ATTR_ENCAP 0 -- 4 4 (VLAN encapsulation)
153 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (inner VLAN ethertype)
Jesse Grossccb13522011-10-25 19:26:31 -0700154 * OVS_KEY_ATTR_IPV6 40 -- 4 44
155 * OVS_KEY_ATTR_ICMPV6 2 2 4 8
156 * OVS_KEY_ATTR_ND 28 -- 4 32
157 * -------------------------------------------------
Ansis Atteka39c7caeb2012-11-26 11:24:11 -0800158 * total 152
Jesse Grossccb13522011-10-25 19:26:31 -0700159 */
Ansis Atteka39c7caeb2012-11-26 11:24:11 -0800160#define FLOW_BUFSIZE 152
Jesse Grossccb13522011-10-25 19:26:31 -0700161
162int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
163int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
164 const struct nlattr *);
Ansis Atteka39c7caeb2012-11-26 11:24:11 -0800165int ovs_flow_metadata_from_nlattrs(u32 *priority, u32 *mark, u16 *in_port,
Jesse Grossccb13522011-10-25 19:26:31 -0700166 const struct nlattr *);
167
Pravin B Shelar15eac2a2012-08-23 12:40:54 -0700168#define MAX_ACTIONS_BUFSIZE (16 * 1024)
Jesse Grossccb13522011-10-25 19:26:31 -0700169#define TBL_MIN_BUCKETS 1024
170
171struct flow_table {
172 struct flex_array *buckets;
173 unsigned int count, n_buckets;
174 struct rcu_head rcu;
175 int node_ver;
176 u32 hash_seed;
177 bool keep_flows;
178};
179
180static inline int ovs_flow_tbl_count(struct flow_table *table)
181{
182 return table->count;
183}
184
185static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
186{
187 return (table->count > table->n_buckets);
188}
189
190struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
191 struct sw_flow_key *key, int len);
192void ovs_flow_tbl_destroy(struct flow_table *table);
193void ovs_flow_tbl_deferred_destroy(struct flow_table *table);
194struct flow_table *ovs_flow_tbl_alloc(int new_size);
195struct flow_table *ovs_flow_tbl_expand(struct flow_table *table);
196struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table);
197void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow);
198void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
199u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len);
200
201struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
202extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];
203
204#endif /* flow.h */