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
[];
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))
48 struct ovs_key_ipv4_tunnel
{
57 static inline void ovs_flow_tun_key_init(struct ovs_key_ipv4_tunnel
*tun_key
,
58 const struct iphdr
*iph
, __be64 tun_id
,
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
;
68 /* clear struct padding. */
69 memset((unsigned char *) tun_key
+ OVS_TUNNEL_KEY_SIZE
, 0,
70 sizeof(*tun_key
) - OVS_TUNNEL_KEY_SIZE
);
74 struct ovs_key_ipv4_tunnel tun_key
; /* Encapsulating tunnel key. */
76 u32 priority
; /* Packet QoS priority. */
77 u32 skb_mark
; /* SKB mark. */
78 u16 in_port
; /* Input switch port (or DP_MAX_PORTS). */
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. */
87 u8 proto
; /* IP protocol or lower 8 bits of ARP opcode. */
89 u8 ttl
; /* IP TTL/hop limit. */
90 u8 frag
; /* One of OVS_FRAG_TYPE_*. */
95 __be32 src
; /* IP source address. */
96 __be32 dst
; /* IP destination address. */
100 __be16 src
; /* TCP/UDP source port. */
101 __be16 dst
; /* TCP/UDP destination port. */
104 u8 sha
[ETH_ALEN
]; /* ARP source hardware address. */
105 u8 tha
[ETH_ALEN
]; /* ARP target hardware address. */
111 struct in6_addr src
; /* IPv6 source address. */
112 struct in6_addr dst
; /* IPv6 destination address. */
114 __be32 label
; /* IPv6 flow label. */
116 __be16 src
; /* TCP/UDP source port. */
117 __be16 dst
; /* TCP/UDP destination port. */
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. */
130 struct hlist_node hash_node
[2];
133 struct sw_flow_key key
;
134 struct sw_flow_actions __rcu
*sf_acts
;
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. */
143 struct 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) */
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 */
157 int ovs_flow_init(void);
158 void ovs_flow_exit(void);
160 struct sw_flow
*ovs_flow_alloc(void);
161 void ovs_flow_deferred_free(struct sw_flow
*);
162 void ovs_flow_free(struct sw_flow
*flow
);
164 struct sw_flow_actions
*ovs_flow_actions_alloc(int actions_len
);
165 void ovs_flow_deferred_free_acts(struct sw_flow_actions
*);
167 int ovs_flow_extract(struct sk_buff
*, u16 in_port
, struct sw_flow_key
*,
169 void ovs_flow_used(struct sw_flow
*, struct sk_buff
*);
170 u64
ovs_flow_used_time(unsigned long flow_jiffies
);
172 int ovs_flow_to_nlattrs(const struct sw_flow_key
*, struct sk_buff
*);
173 int ovs_flow_from_nlattrs(struct sw_flow_key
*swkey
, int *key_lenp
,
174 const struct nlattr
*);
175 int ovs_flow_metadata_from_nlattrs(struct sw_flow
*flow
, int key_len
,
176 const struct nlattr
*attr
);
178 #define MAX_ACTIONS_BUFSIZE (32 * 1024)
179 #define TBL_MIN_BUCKETS 1024
182 struct flex_array
*buckets
;
183 unsigned int count
, n_buckets
;
190 static inline int ovs_flow_tbl_count(struct flow_table
*table
)
195 static inline int ovs_flow_tbl_need_to_expand(struct flow_table
*table
)
197 return (table
->count
> table
->n_buckets
);
200 struct sw_flow
*ovs_flow_tbl_lookup(struct flow_table
*table
,
201 struct sw_flow_key
*key
, int len
);
202 void ovs_flow_tbl_destroy(struct flow_table
*table
);
203 void ovs_flow_tbl_deferred_destroy(struct flow_table
*table
);
204 struct flow_table
*ovs_flow_tbl_alloc(int new_size
);
205 struct flow_table
*ovs_flow_tbl_expand(struct flow_table
*table
);
206 struct flow_table
*ovs_flow_tbl_rehash(struct flow_table
*table
);
207 void ovs_flow_tbl_insert(struct flow_table
*table
, struct sw_flow
*flow
,
208 struct sw_flow_key
*key
, int key_len
);
209 void ovs_flow_tbl_remove(struct flow_table
*table
, struct sw_flow
*flow
);
211 struct sw_flow
*ovs_flow_tbl_next(struct flow_table
*table
, u32
*bucket
, u32
*idx
);
212 extern const int ovs_key_lens
[OVS_KEY_ATTR_MAX
+ 1];
213 int ovs_ipv4_tun_from_nlattr(const struct nlattr
*attr
,
214 struct ovs_key_ipv4_tunnel
*tun_key
);
215 int ovs_ipv4_tun_to_nlattr(struct sk_buff
*skb
,
216 const struct ovs_key_ipv4_tunnel
*tun_key
);