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flow.h
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1 /*
2  * Copyright (c) 2007-2011 Nicira, Inc.
3  *
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 
35 struct sk_buff;
36 
37 struct sw_flow_actions {
38  struct rcu_head rcu;
39  u32 actions_len;
40  struct nlattr actions[];
41 };
42 
43 struct sw_flow_key {
44  struct {
45  u32 priority; /* Packet QoS priority. */
46  u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
47  } phy;
48  struct {
49  u8 src[ETH_ALEN]; /* Ethernet source address. */
50  u8 dst[ETH_ALEN]; /* Ethernet destination address. */
51  __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
52  __be16 type; /* Ethernet frame type. */
53  } eth;
54  struct {
55  u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
56  u8 tos; /* IP ToS. */
57  u8 ttl; /* IP TTL/hop limit. */
58  u8 frag; /* One of OVS_FRAG_TYPE_*. */
59  } ip;
60  union {
61  struct {
62  struct {
63  __be32 src; /* IP source address. */
64  __be32 dst; /* IP destination address. */
65  } addr;
66  union {
67  struct {
68  __be16 src; /* TCP/UDP source port. */
69  __be16 dst; /* TCP/UDP destination port. */
70  } tp;
71  struct {
72  u8 sha[ETH_ALEN]; /* ARP source hardware address. */
73  u8 tha[ETH_ALEN]; /* ARP target hardware address. */
74  } arp;
75  };
76  } ipv4;
77  struct {
78  struct {
79  struct in6_addr src; /* IPv6 source address. */
80  struct in6_addr dst; /* IPv6 destination address. */
81  } addr;
82  __be32 label; /* IPv6 flow label. */
83  struct {
84  __be16 src; /* TCP/UDP source port. */
85  __be16 dst; /* TCP/UDP destination port. */
86  } tp;
87  struct {
88  struct in6_addr target; /* ND target address. */
89  u8 sll[ETH_ALEN]; /* ND source link layer address. */
90  u8 tll[ETH_ALEN]; /* ND target link layer address. */
91  } nd;
92  } ipv6;
93  };
94 };
95 
96 struct sw_flow {
97  struct rcu_head rcu;
98  struct hlist_node hash_node[2];
99  u32 hash;
100 
101  struct sw_flow_key key;
102  struct sw_flow_actions __rcu *sf_acts;
103 
104  spinlock_t lock; /* Lock for values below. */
105  unsigned long used; /* Last used time (in jiffies). */
106  u64 packet_count; /* Number of packets matched. */
107  u64 byte_count; /* Number of bytes matched. */
108  u8 tcp_flags; /* Union of seen TCP flags. */
109 };
110 
111 struct arp_eth_header {
112  __be16 ar_hrd; /* format of hardware address */
113  __be16 ar_pro; /* format of protocol address */
114  unsigned char ar_hln; /* length of hardware address */
115  unsigned char ar_pln; /* length of protocol address */
116  __be16 ar_op; /* ARP opcode (command) */
117 
118  /* Ethernet+IPv4 specific members. */
119  unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
120  unsigned char ar_sip[4]; /* sender IP address */
121  unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
122  unsigned char ar_tip[4]; /* target IP address */
123 } __packed;
124 
125 int ovs_flow_init(void);
126 void ovs_flow_exit(void);
127 
128 struct sw_flow *ovs_flow_alloc(void);
129 void ovs_flow_deferred_free(struct sw_flow *);
130 void ovs_flow_free(struct sw_flow *flow);
131 
132 struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *);
133 void ovs_flow_deferred_free_acts(struct sw_flow_actions *);
134 
135 int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
136  int *key_lenp);
137 void ovs_flow_used(struct sw_flow *, struct sk_buff *);
138 u64 ovs_flow_used_time(unsigned long flow_jiffies);
139 
140 /* Upper bound on the length of a nlattr-formatted flow key. The longest
141  * nlattr-formatted flow key would be:
142  *
143  * struct pad nl hdr total
144  * ------ --- ------ -----
145  * OVS_KEY_ATTR_PRIORITY 4 -- 4 8
146  * OVS_KEY_ATTR_IN_PORT 4 -- 4 8
147  * OVS_KEY_ATTR_ETHERNET 12 -- 4 16
148  * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (outer VLAN ethertype)
149  * OVS_KEY_ATTR_8021Q 4 -- 4 8
150  * OVS_KEY_ATTR_ENCAP 0 -- 4 4 (VLAN encapsulation)
151  * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (inner VLAN ethertype)
152  * OVS_KEY_ATTR_IPV6 40 -- 4 44
153  * OVS_KEY_ATTR_ICMPV6 2 2 4 8
154  * OVS_KEY_ATTR_ND 28 -- 4 32
155  * -------------------------------------------------
156  * total 144
157  */
158 #define FLOW_BUFSIZE 144
159 
160 int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
161 int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
162  const struct nlattr *);
163 int ovs_flow_metadata_from_nlattrs(u32 *priority, u16 *in_port,
164  const struct nlattr *);
165 
166 #define MAX_ACTIONS_BUFSIZE (16 * 1024)
167 #define TBL_MIN_BUCKETS 1024
168 
169 struct flow_table {
170  struct flex_array *buckets;
171  unsigned int count, n_buckets;
172  struct rcu_head rcu;
173  int node_ver;
174  u32 hash_seed;
175  bool keep_flows;
176 };
177 
178 static inline int ovs_flow_tbl_count(struct flow_table *table)
179 {
180  return table->count;
181 }
182 
183 static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
184 {
185  return (table->count > table->n_buckets);
186 }
187 
188 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
189  struct sw_flow_key *key, int len);
190 void ovs_flow_tbl_destroy(struct flow_table *table);
191 void ovs_flow_tbl_deferred_destroy(struct flow_table *table);
192 struct flow_table *ovs_flow_tbl_alloc(int new_size);
193 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table);
194 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table);
195 void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow);
196 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
197 u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len);
198 
199 struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
200 extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];
201 
202 #endif /* flow.h */
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