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 {
41 struct nlattr actions[];
44 /* Tunnel flow flags. */
45 #define OVS_TNL_F_DONT_FRAGMENT (1 << 0)
46 #define OVS_TNL_F_CSUM (1 << 1)
47 #define OVS_TNL_F_KEY (1 << 2)
49 /* Used to memset ovs_key_ipv4_tunnel padding. */
50 #define OVS_TUNNEL_KEY_SIZE \
51 (offsetof(struct ovs_key_ipv4_tunnel, ipv4_ttl) + \
52 FIELD_SIZEOF(struct ovs_key_ipv4_tunnel, ipv4_ttl))
54 struct ovs_key_ipv4_tunnel {
64 struct ovs_key_ipv4_tunnel tun_key; /* Encapsulating tunnel key. */
66 u32 priority; /* Packet QoS priority. */
67 u32 skb_mark; /* SKB mark. */
68 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
71 u8 src[ETH_ALEN]; /* Ethernet source address. */
72 u8 dst[ETH_ALEN]; /* Ethernet destination address. */
73 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
74 __be16 type; /* Ethernet frame type. */
77 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
79 u8 ttl; /* IP TTL/hop limit. */
80 u8 frag; /* One of OVS_FRAG_TYPE_*. */
85 __be32 src; /* IP source address. */
86 __be32 dst; /* IP destination address. */
90 __be16 src; /* TCP/UDP source port. */
91 __be16 dst; /* TCP/UDP destination port. */
94 u8 sha[ETH_ALEN]; /* ARP source hardware address. */
95 u8 tha[ETH_ALEN]; /* ARP target hardware address. */
101 struct in6_addr src; /* IPv6 source address. */
102 struct in6_addr dst; /* IPv6 destination address. */
104 __be32 label; /* IPv6 flow label. */
106 __be16 src; /* TCP/UDP source port. */
107 __be16 dst; /* TCP/UDP destination port. */
110 struct in6_addr target; /* ND target address. */
111 u8 sll[ETH_ALEN]; /* ND source link layer address. */
112 u8 tll[ETH_ALEN]; /* ND target link layer address. */
120 struct hlist_node hash_node[2];
123 struct sw_flow_key key;
124 struct sw_flow_actions __rcu *sf_acts;
126 spinlock_t lock; /* Lock for values below. */
127 unsigned long used; /* Last used time (in jiffies). */
128 u64 packet_count; /* Number of packets matched. */
129 u64 byte_count; /* Number of bytes matched. */
130 u8 tcp_flags; /* Union of seen TCP flags. */
133 struct arp_eth_header {
134 __be16 ar_hrd; /* format of hardware address */
135 __be16 ar_pro; /* format of protocol address */
136 unsigned char ar_hln; /* length of hardware address */
137 unsigned char ar_pln; /* length of protocol address */
138 __be16 ar_op; /* ARP opcode (command) */
140 /* Ethernet+IPv4 specific members. */
141 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
142 unsigned char ar_sip[4]; /* sender IP address */
143 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
144 unsigned char ar_tip[4]; /* target IP address */
147 int ovs_flow_init(void);
148 void ovs_flow_exit(void);
150 struct sw_flow *ovs_flow_alloc(void);
151 void ovs_flow_deferred_free(struct sw_flow *);
152 void ovs_flow_free(struct sw_flow *);
154 struct sw_flow_actions *ovs_flow_actions_alloc(int actions_len);
155 void ovs_flow_actions_free(struct sw_flow_actions *sfa);
156 void ovs_flow_deferred_free_acts(struct sw_flow_actions *);
158 int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
160 void ovs_flow_used(struct sw_flow *, struct sk_buff *);
161 u64 ovs_flow_used_time(unsigned long flow_jiffies);
163 /* Upper bound on the length of a nlattr-formatted flow key. The longest
164 * nlattr-formatted flow key would be:
166 * struct pad nl hdr total
167 * ------ --- ------ -----
168 * OVS_KEY_ATTR_PRIORITY 4 -- 4 8
169 * OVS_KEY_ATTR_TUN_ID 8 -- 4 12
170 * OVS_KEY_ATTR_TUNNEL 0 -- 4 4
171 * - OVS_TUNNEL_KEY_ATTR_ID 8 -- 4 12
172 * - OVS_TUNNEL_KEY_ATTR_IPV4_SRC 4 -- 4 8
173 * - OVS_TUNNEL_KEY_ATTR_IPV4_DST 4 -- 4 8
174 * - OVS_TUNNEL_KEY_ATTR_TOS 1 3 4 8
175 * - OVS_TUNNEL_KEY_ATTR_TTL 1 3 4 8
176 * - OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT 0 -- 4 4
177 * - OVS_TUNNEL_KEY_ATTR_CSUM 0 -- 4 4
178 * OVS_KEY_ATTR_IN_PORT 4 -- 4 8
179 * OVS_KEY_ATTR_SKB_MARK 4 -- 4 8
180 * OVS_KEY_ATTR_ETHERNET 12 -- 4 16
181 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (outer VLAN ethertype)
182 * OVS_KEY_ATTR_8021Q 4 -- 4 8
183 * OVS_KEY_ATTR_ENCAP 0 -- 4 4 (VLAN encapsulation)
184 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (inner VLAN ethertype)
185 * OVS_KEY_ATTR_IPV6 40 -- 4 44
186 * OVS_KEY_ATTR_ICMPV6 2 2 4 8
187 * OVS_KEY_ATTR_ND 28 -- 4 32
188 * ----------------------------------------------------------
191 #define FLOW_BUFSIZE 220
193 int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
194 int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
195 const struct nlattr *);
196 int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, int key_len,
197 const struct nlattr *attr);
199 #define MAX_ACTIONS_BUFSIZE (32 * 1024)
200 #define MAX_ACTIONS_BUFSIZE_KMALLOC PAGE_SIZE
201 #define TBL_MIN_BUCKETS 1024
204 struct flex_array *buckets;
205 unsigned int count, n_buckets;
212 static inline int ovs_flow_tbl_count(struct flow_table *table)
217 static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
219 return (table->count > table->n_buckets);
222 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
223 struct sw_flow_key *key, int len);
224 void ovs_flow_tbl_destroy(struct flow_table *table);
225 void ovs_flow_tbl_deferred_destroy(struct flow_table *table);
226 struct flow_table *ovs_flow_tbl_alloc(int new_size);
227 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table);
228 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table);
229 void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
230 struct sw_flow_key *key, int key_len);
231 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
233 struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
234 extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];
235 int ipv4_tun_from_nlattr(const struct nlattr *attr,
236 struct ovs_key_ipv4_tunnel *tun_key);
237 int ipv4_tun_to_nlattr(struct sk_buff *skb,
238 const struct ovs_key_ipv4_tunnel *tun_key);