2 * Copyright (c) 2007-2014 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/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 #include <net/ip_tunnels.h>
36 #include <net/dst_metadata.h>
40 /* Store options at the end of the array if they are less than the
41 * maximum size. This allows us to get the benefits of variable length
42 * matching for small options.
44 #define TUN_METADATA_OFFSET(opt_len) \
45 (FIELD_SIZEOF(struct sw_flow_key, tun_opts) - opt_len)
46 #define TUN_METADATA_OPTS(flow_key, opt_len) \
47 ((void *)((flow_key)->tun_opts + TUN_METADATA_OFFSET(opt_len)))
49 struct ovs_tunnel_info {
50 struct metadata_dst *tun_dst;
53 #define OVS_SW_FLOW_KEY_METADATA_SIZE \
54 (offsetof(struct sw_flow_key, recirc_id) + \
55 FIELD_SIZEOF(struct sw_flow_key, recirc_id))
60 struct ip_tunnel_key tun_key; /* Encapsulating tunnel key. */
62 u32 priority; /* Packet QoS priority. */
63 u32 skb_mark; /* SKB mark. */
64 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
65 } __packed phy; /* Safe when right after 'tun_key'. */
66 u32 ovs_flow_hash; /* Datapath computed hash value. */
67 u32 recirc_id; /* Recirculation ID. */
69 u8 src[ETH_ALEN]; /* Ethernet source address. */
70 u8 dst[ETH_ALEN]; /* Ethernet destination address. */
71 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
72 __be16 type; /* Ethernet frame type. */
76 __be32 top_lse; /* top label stack entry */
79 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
81 u8 ttl; /* IP TTL/hop limit. */
82 u8 frag; /* One of OVS_FRAG_TYPE_*. */
86 __be16 src; /* TCP/UDP/SCTP source port. */
87 __be16 dst; /* TCP/UDP/SCTP destination port. */
88 __be16 flags; /* TCP flags. */
93 __be32 src; /* IP source address. */
94 __be32 dst; /* IP destination address. */
97 u8 sha[ETH_ALEN]; /* ARP source hardware address. */
98 u8 tha[ETH_ALEN]; /* ARP target hardware address. */
103 struct in6_addr src; /* IPv6 source address. */
104 struct in6_addr dst; /* IPv6 destination address. */
106 __be32 label; /* IPv6 flow label. */
108 struct in6_addr target; /* ND target address. */
109 u8 sll[ETH_ALEN]; /* ND source link layer address. */
110 u8 tll[ETH_ALEN]; /* ND target link layer address. */
115 /* Connection tracking fields. */
119 struct ovs_key_ct_labels labels;
122 } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
124 struct sw_flow_key_range {
125 unsigned short int start;
126 unsigned short int end;
129 struct sw_flow_mask {
132 struct list_head list;
133 struct sw_flow_key_range range;
134 struct sw_flow_key key;
137 struct sw_flow_match {
138 struct sw_flow_key *key;
139 struct sw_flow_key_range range;
140 struct sw_flow_mask *mask;
143 #define MAX_UFID_LENGTH 16 /* 128 bits */
148 u32 ufid[MAX_UFID_LENGTH / 4];
149 struct sw_flow_key *unmasked_key;
153 struct sw_flow_actions {
155 size_t orig_len; /* From flow_cmd_new netlink actions size */
157 struct nlattr actions[];
161 u64 packet_count; /* Number of packets matched. */
162 u64 byte_count; /* Number of bytes matched. */
163 unsigned long used; /* Last used time (in jiffies). */
164 spinlock_t lock; /* Lock for atomic stats update. */
165 __be16 tcp_flags; /* Union of seen TCP flags. */
171 struct hlist_node node[2];
173 } flow_table, ufid_table;
174 int stats_last_writer; /* NUMA-node id of the last writer on
177 struct sw_flow_key key;
178 struct sw_flow_id id;
179 struct sw_flow_mask *mask;
180 struct sw_flow_actions __rcu *sf_acts;
181 struct flow_stats __rcu *stats[]; /* One for each NUMA node. First one
182 * is allocated at flow creation time,
183 * the rest are allocated on demand
184 * while holding the 'stats[0].lock'.
188 struct arp_eth_header {
189 __be16 ar_hrd; /* format of hardware address */
190 __be16 ar_pro; /* format of protocol address */
191 unsigned char ar_hln; /* length of hardware address */
192 unsigned char ar_pln; /* length of protocol address */
193 __be16 ar_op; /* ARP opcode (command) */
195 /* Ethernet+IPv4 specific members. */
196 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
197 unsigned char ar_sip[4]; /* sender IP address */
198 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
199 unsigned char ar_tip[4]; /* target IP address */
202 static inline bool ovs_identifier_is_ufid(const struct sw_flow_id *sfid)
204 return sfid->ufid_len;
207 static inline bool ovs_identifier_is_key(const struct sw_flow_id *sfid)
209 return !ovs_identifier_is_ufid(sfid);
212 void ovs_flow_stats_update(struct sw_flow *, __be16 tcp_flags,
213 const struct sk_buff *);
214 void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
215 unsigned long *used, __be16 *tcp_flags);
216 void ovs_flow_stats_clear(struct sw_flow *);
217 u64 ovs_flow_used_time(unsigned long flow_jiffies);
219 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key);
220 int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
222 struct sw_flow_key *key);
223 /* Extract key from packet coming from userspace. */
224 int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
226 struct sw_flow_key *key, bool log);