Loading...
1/*
2 * Copyright (c) 2007-2011 Nicira Networks.
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
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. */
46 u16 in_port; /* Input switch port (or USHRT_MAX). */
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
96struct 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
111struct 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
125int ovs_flow_init(void);
126void ovs_flow_exit(void);
127
128struct sw_flow *ovs_flow_alloc(void);
129void ovs_flow_deferred_free(struct sw_flow *);
130void ovs_flow_free(struct sw_flow *flow);
131
132struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *);
133void ovs_flow_deferred_free_acts(struct sw_flow_actions *);
134
135int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
136 int *key_lenp);
137void ovs_flow_used(struct sw_flow *, struct sk_buff *);
138u64 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_8021Q 4 -- 4 8
149 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8
150 * OVS_KEY_ATTR_IPV6 40 -- 4 44
151 * OVS_KEY_ATTR_ICMPV6 2 2 4 8
152 * OVS_KEY_ATTR_ND 28 -- 4 32
153 * -------------------------------------------------
154 * total 132
155 */
156#define FLOW_BUFSIZE 132
157
158int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
159int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
160 const struct nlattr *);
161int ovs_flow_metadata_from_nlattrs(u32 *priority, u16 *in_port,
162 const struct nlattr *);
163
164#define TBL_MIN_BUCKETS 1024
165
166struct flow_table {
167 struct flex_array *buckets;
168 unsigned int count, n_buckets;
169 struct rcu_head rcu;
170 int node_ver;
171 u32 hash_seed;
172 bool keep_flows;
173};
174
175static inline int ovs_flow_tbl_count(struct flow_table *table)
176{
177 return table->count;
178}
179
180static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
181{
182 return (table->count > table->n_buckets);
183}
184
185struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
186 struct sw_flow_key *key, int len);
187void ovs_flow_tbl_destroy(struct flow_table *table);
188void ovs_flow_tbl_deferred_destroy(struct flow_table *table);
189struct flow_table *ovs_flow_tbl_alloc(int new_size);
190struct flow_table *ovs_flow_tbl_expand(struct flow_table *table);
191struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table);
192void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow);
193void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
194u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len);
195
196struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
197extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];
198
199#endif /* flow.h */
1/*
2 * Copyright (c) 2007-2013 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/cache.h>
23#include <linux/kernel.h>
24#include <linux/netlink.h>
25#include <linux/openvswitch.h>
26#include <linux/spinlock.h>
27#include <linux/types.h>
28#include <linux/rcupdate.h>
29#include <linux/if_ether.h>
30#include <linux/in6.h>
31#include <linux/jiffies.h>
32#include <linux/time.h>
33#include <linux/flex_array.h>
34#include <net/inet_ecn.h>
35
36struct sk_buff;
37
38/* Used to memset ovs_key_ipv4_tunnel padding. */
39#define OVS_TUNNEL_KEY_SIZE \
40 (offsetof(struct ovs_key_ipv4_tunnel, ipv4_ttl) + \
41 FIELD_SIZEOF(struct ovs_key_ipv4_tunnel, ipv4_ttl))
42
43struct ovs_key_ipv4_tunnel {
44 __be64 tun_id;
45 __be32 ipv4_src;
46 __be32 ipv4_dst;
47 __be16 tun_flags;
48 u8 ipv4_tos;
49 u8 ipv4_ttl;
50};
51
52static inline void ovs_flow_tun_key_init(struct ovs_key_ipv4_tunnel *tun_key,
53 const struct iphdr *iph, __be64 tun_id,
54 __be16 tun_flags)
55{
56 tun_key->tun_id = tun_id;
57 tun_key->ipv4_src = iph->saddr;
58 tun_key->ipv4_dst = iph->daddr;
59 tun_key->ipv4_tos = iph->tos;
60 tun_key->ipv4_ttl = iph->ttl;
61 tun_key->tun_flags = tun_flags;
62
63 /* clear struct padding. */
64 memset((unsigned char *) tun_key + OVS_TUNNEL_KEY_SIZE, 0,
65 sizeof(*tun_key) - OVS_TUNNEL_KEY_SIZE);
66}
67
68struct sw_flow_key {
69 struct ovs_key_ipv4_tunnel tun_key; /* Encapsulating tunnel key. */
70 struct {
71 u32 priority; /* Packet QoS priority. */
72 u32 skb_mark; /* SKB mark. */
73 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
74 } phy;
75 struct {
76 u8 src[ETH_ALEN]; /* Ethernet source address. */
77 u8 dst[ETH_ALEN]; /* Ethernet destination address. */
78 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
79 __be16 type; /* Ethernet frame type. */
80 } eth;
81 struct {
82 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
83 u8 tos; /* IP ToS. */
84 u8 ttl; /* IP TTL/hop limit. */
85 u8 frag; /* One of OVS_FRAG_TYPE_*. */
86 } ip;
87 union {
88 struct {
89 struct {
90 __be32 src; /* IP source address. */
91 __be32 dst; /* IP destination address. */
92 } addr;
93 union {
94 struct {
95 __be16 src; /* TCP/UDP/SCTP source port. */
96 __be16 dst; /* TCP/UDP/SCTP destination port. */
97 __be16 flags; /* TCP flags. */
98 } tp;
99 struct {
100 u8 sha[ETH_ALEN]; /* ARP source hardware address. */
101 u8 tha[ETH_ALEN]; /* ARP target hardware address. */
102 } arp;
103 };
104 } ipv4;
105 struct {
106 struct {
107 struct in6_addr src; /* IPv6 source address. */
108 struct in6_addr dst; /* IPv6 destination address. */
109 } addr;
110 __be32 label; /* IPv6 flow label. */
111 struct {
112 __be16 src; /* TCP/UDP/SCTP source port. */
113 __be16 dst; /* TCP/UDP/SCTP destination port. */
114 __be16 flags; /* TCP flags. */
115 } tp;
116 struct {
117 struct in6_addr target; /* ND target address. */
118 u8 sll[ETH_ALEN]; /* ND source link layer address. */
119 u8 tll[ETH_ALEN]; /* ND target link layer address. */
120 } nd;
121 } ipv6;
122 };
123} __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
124
125struct sw_flow_key_range {
126 unsigned short int start;
127 unsigned short int end;
128};
129
130struct sw_flow_mask {
131 int ref_count;
132 struct rcu_head rcu;
133 struct list_head list;
134 struct sw_flow_key_range range;
135 struct sw_flow_key key;
136};
137
138struct sw_flow_match {
139 struct sw_flow_key *key;
140 struct sw_flow_key_range range;
141 struct sw_flow_mask *mask;
142};
143
144struct sw_flow_actions {
145 struct rcu_head rcu;
146 u32 actions_len;
147 struct nlattr actions[];
148};
149
150struct flow_stats {
151 u64 packet_count; /* Number of packets matched. */
152 u64 byte_count; /* Number of bytes matched. */
153 unsigned long used; /* Last used time (in jiffies). */
154 spinlock_t lock; /* Lock for atomic stats update. */
155 __be16 tcp_flags; /* Union of seen TCP flags. */
156};
157
158struct sw_flow_stats {
159 bool is_percpu;
160 union {
161 struct flow_stats *stat;
162 struct flow_stats __percpu *cpu_stats;
163 };
164};
165
166struct sw_flow {
167 struct rcu_head rcu;
168 struct hlist_node hash_node[2];
169 u32 hash;
170
171 struct sw_flow_key key;
172 struct sw_flow_key unmasked_key;
173 struct sw_flow_mask *mask;
174 struct sw_flow_actions __rcu *sf_acts;
175 struct sw_flow_stats stats;
176};
177
178struct arp_eth_header {
179 __be16 ar_hrd; /* format of hardware address */
180 __be16 ar_pro; /* format of protocol address */
181 unsigned char ar_hln; /* length of hardware address */
182 unsigned char ar_pln; /* length of protocol address */
183 __be16 ar_op; /* ARP opcode (command) */
184
185 /* Ethernet+IPv4 specific members. */
186 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
187 unsigned char ar_sip[4]; /* sender IP address */
188 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
189 unsigned char ar_tip[4]; /* target IP address */
190} __packed;
191
192void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb);
193void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *stats,
194 unsigned long *used, __be16 *tcp_flags);
195void ovs_flow_stats_clear(struct sw_flow *flow);
196u64 ovs_flow_used_time(unsigned long flow_jiffies);
197
198int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *);
199
200#endif /* flow.h */