Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
35struct sk_buff;
36
37struct sw_flow_actions {
38 struct rcu_head rcu;
39 u32 actions_len;
40 struct nlattr actions[];
41};
42
43/* Used to memset ovs_key_ipv4_tunnel padding. */
44#define OVS_TUNNEL_KEY_SIZE \
45 (offsetof(struct ovs_key_ipv4_tunnel, ipv4_ttl) + \
46 FIELD_SIZEOF(struct ovs_key_ipv4_tunnel, ipv4_ttl))
47
48struct ovs_key_ipv4_tunnel {
49 __be64 tun_id;
50 __be32 ipv4_src;
51 __be32 ipv4_dst;
52 __be16 tun_flags;
53 u8 ipv4_tos;
54 u8 ipv4_ttl;
55};
56
57static inline void ovs_flow_tun_key_init(struct ovs_key_ipv4_tunnel *tun_key,
58 const struct iphdr *iph, __be64 tun_id,
59 __be16 tun_flags)
60{
61 tun_key->tun_id = tun_id;
62 tun_key->ipv4_src = iph->saddr;
63 tun_key->ipv4_dst = iph->daddr;
64 tun_key->ipv4_tos = iph->tos;
65 tun_key->ipv4_ttl = iph->ttl;
66 tun_key->tun_flags = tun_flags;
67
68 /* clear struct padding. */
69 memset((unsigned char *) tun_key + OVS_TUNNEL_KEY_SIZE, 0,
70 sizeof(*tun_key) - OVS_TUNNEL_KEY_SIZE);
71}
72
73struct sw_flow_key {
74 struct ovs_key_ipv4_tunnel tun_key; /* Encapsulating tunnel key. */
75 struct {
76 u32 priority; /* Packet QoS priority. */
77 u32 skb_mark; /* SKB mark. */
78 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
79 } phy;
80 struct {
81 u8 src[ETH_ALEN]; /* Ethernet source address. */
82 u8 dst[ETH_ALEN]; /* Ethernet destination address. */
83 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
84 __be16 type; /* Ethernet frame type. */
85 } eth;
86 struct {
87 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
88 u8 tos; /* IP ToS. */
89 u8 ttl; /* IP TTL/hop limit. */
90 u8 frag; /* One of OVS_FRAG_TYPE_*. */
91 } ip;
92 union {
93 struct {
94 struct {
95 __be32 src; /* IP source address. */
96 __be32 dst; /* IP destination address. */
97 } addr;
98 union {
99 struct {
100 __be16 src; /* TCP/UDP source port. */
101 __be16 dst; /* TCP/UDP destination port. */
102 } tp;
103 struct {
104 u8 sha[ETH_ALEN]; /* ARP source hardware address. */
105 u8 tha[ETH_ALEN]; /* ARP target hardware address. */
106 } arp;
107 };
108 } ipv4;
109 struct {
110 struct {
111 struct in6_addr src; /* IPv6 source address. */
112 struct in6_addr dst; /* IPv6 destination address. */
113 } addr;
114 __be32 label; /* IPv6 flow label. */
115 struct {
116 __be16 src; /* TCP/UDP source port. */
117 __be16 dst; /* TCP/UDP destination port. */
118 } tp;
119 struct {
120 struct in6_addr target; /* ND target address. */
121 u8 sll[ETH_ALEN]; /* ND source link layer address. */
122 u8 tll[ETH_ALEN]; /* ND target link layer address. */
123 } nd;
124 } ipv6;
125 };
126};
127
128struct sw_flow {
129 struct rcu_head rcu;
130 struct hlist_node hash_node[2];
131 u32 hash;
132
133 struct sw_flow_key key;
134 struct sw_flow_actions __rcu *sf_acts;
135
136 spinlock_t lock; /* Lock for values below. */
137 unsigned long used; /* Last used time (in jiffies). */
138 u64 packet_count; /* Number of packets matched. */
139 u64 byte_count; /* Number of bytes matched. */
140 u8 tcp_flags; /* Union of seen TCP flags. */
141};
142
143struct arp_eth_header {
144 __be16 ar_hrd; /* format of hardware address */
145 __be16 ar_pro; /* format of protocol address */
146 unsigned char ar_hln; /* length of hardware address */
147 unsigned char ar_pln; /* length of protocol address */
148 __be16 ar_op; /* ARP opcode (command) */
149
150 /* Ethernet+IPv4 specific members. */
151 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
152 unsigned char ar_sip[4]; /* sender IP address */
153 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
154 unsigned char ar_tip[4]; /* target IP address */
155} __packed;
156
157int ovs_flow_init(void);
158void ovs_flow_exit(void);
159
160struct sw_flow *ovs_flow_alloc(void);
161void ovs_flow_deferred_free(struct sw_flow *);
162void ovs_flow_free(struct sw_flow *flow);
163
164struct sw_flow_actions *ovs_flow_actions_alloc(int actions_len);
165void ovs_flow_deferred_free_acts(struct sw_flow_actions *);
166
167int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
168 int *key_lenp);
169void ovs_flow_used(struct sw_flow *, struct sk_buff *);
170u64 ovs_flow_used_time(unsigned long flow_jiffies);
171
172int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
173int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
174 const struct nlattr *);
175int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, int key_len,
176 const struct nlattr *attr);
177
178#define MAX_ACTIONS_BUFSIZE (32 * 1024)
179#define TBL_MIN_BUCKETS 1024
180
181struct flow_table {
182 struct flex_array *buckets;
183 unsigned int count, n_buckets;
184 struct rcu_head rcu;
185 int node_ver;
186 u32 hash_seed;
187 bool keep_flows;
188};
189
190static inline int ovs_flow_tbl_count(struct flow_table *table)
191{
192 return table->count;
193}
194
195static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
196{
197 return (table->count > table->n_buckets);
198}
199
200struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
201 struct sw_flow_key *key, int len);
202void ovs_flow_tbl_destroy(struct flow_table *table);
203void ovs_flow_tbl_deferred_destroy(struct flow_table *table);
204struct flow_table *ovs_flow_tbl_alloc(int new_size);
205struct flow_table *ovs_flow_tbl_expand(struct flow_table *table);
206struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table);
207void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
208 struct sw_flow_key *key, int key_len);
209void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
210
211struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
212extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];
213int ovs_ipv4_tun_from_nlattr(const struct nlattr *attr,
214 struct ovs_key_ipv4_tunnel *tun_key);
215int ovs_ipv4_tun_to_nlattr(struct sk_buff *skb,
216 const struct ovs_key_ipv4_tunnel *tun_key);
217
218#endif /* flow.h */