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ccb1352e | 1 | /* |
caf2ee14 | 2 | * Copyright (c) 2007-2011 Nicira, Inc. |
ccb1352e JG |
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 | ||
35 | struct sk_buff; | |
36 | ||
37 | struct sw_flow_actions { | |
38 | struct rcu_head rcu; | |
39 | u32 actions_len; | |
40 | struct nlattr actions[]; | |
41 | }; | |
42 | ||
43 | struct 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 | ||
96 | struct 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 | ||
111 | struct 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 | ||
125 | int ovs_flow_init(void); | |
126 | void ovs_flow_exit(void); | |
127 | ||
128 | struct sw_flow *ovs_flow_alloc(void); | |
129 | void ovs_flow_deferred_free(struct sw_flow *); | |
130 | void ovs_flow_free(struct sw_flow *flow); | |
131 | ||
132 | struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *); | |
133 | void ovs_flow_deferred_free_acts(struct sw_flow_actions *); | |
134 | ||
135 | int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *, | |
136 | int *key_lenp); | |
137 | void ovs_flow_used(struct sw_flow *, struct sk_buff *); | |
138 | u64 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 | ||
158 | int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *); | |
159 | int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp, | |
160 | const struct nlattr *); | |
161 | int ovs_flow_metadata_from_nlattrs(u32 *priority, u16 *in_port, | |
162 | const struct nlattr *); | |
163 | ||
164 | #define TBL_MIN_BUCKETS 1024 | |
165 | ||
166 | struct 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 | ||
175 | static inline int ovs_flow_tbl_count(struct flow_table *table) | |
176 | { | |
177 | return table->count; | |
178 | } | |
179 | ||
180 | static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table) | |
181 | { | |
182 | return (table->count > table->n_buckets); | |
183 | } | |
184 | ||
185 | struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table, | |
186 | struct sw_flow_key *key, int len); | |
187 | void ovs_flow_tbl_destroy(struct flow_table *table); | |
188 | void ovs_flow_tbl_deferred_destroy(struct flow_table *table); | |
189 | struct flow_table *ovs_flow_tbl_alloc(int new_size); | |
190 | struct flow_table *ovs_flow_tbl_expand(struct flow_table *table); | |
191 | struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table); | |
192 | void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow); | |
193 | void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow); | |
194 | u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len); | |
195 | ||
196 | struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx); | |
197 | extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1]; | |
198 | ||
199 | #endif /* flow.h */ |