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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 | ||
7d5437c7 PS |
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 | ||
48 | struct ovs_key_ipv4_tunnel { | |
49 | __be64 tun_id; | |
50 | __be32 ipv4_src; | |
51 | __be32 ipv4_dst; | |
aa310701 | 52 | __be16 tun_flags; |
7d5437c7 PS |
53 | u8 ipv4_tos; |
54 | u8 ipv4_ttl; | |
55 | }; | |
56 | ||
aa310701 PS |
57 | static 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 | ||
ccb1352e | 73 | struct sw_flow_key { |
7d5437c7 | 74 | struct ovs_key_ipv4_tunnel tun_key; /* Encapsulating tunnel key. */ |
ccb1352e JG |
75 | struct { |
76 | u32 priority; /* Packet QoS priority. */ | |
39c7caeb | 77 | u32 skb_mark; /* SKB mark. */ |
15eac2a7 | 78 | u16 in_port; /* Input switch port (or DP_MAX_PORTS). */ |
ccb1352e JG |
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 | ||
128 | struct 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 | ||
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) */ | |
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 | ||
157 | int ovs_flow_init(void); | |
158 | void ovs_flow_exit(void); | |
159 | ||
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); | |
163 | ||
74f84a57 | 164 | struct sw_flow_actions *ovs_flow_actions_alloc(int actions_len); |
ccb1352e JG |
165 | void ovs_flow_deferred_free_acts(struct sw_flow_actions *); |
166 | ||
167 | int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *, | |
168 | int *key_lenp); | |
169 | void ovs_flow_used(struct sw_flow *, struct sk_buff *); | |
170 | u64 ovs_flow_used_time(unsigned long flow_jiffies); | |
171 | ||
ccb1352e JG |
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 *); | |
a3e82996 | 175 | int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, int key_len, |
93d8fd15 | 176 | const struct nlattr *attr); |
ccb1352e | 177 | |
ffe3f432 | 178 | #define MAX_ACTIONS_BUFSIZE (32 * 1024) |
ccb1352e JG |
179 | #define TBL_MIN_BUCKETS 1024 |
180 | ||
181 | struct 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 | ||
190 | static inline int ovs_flow_tbl_count(struct flow_table *table) | |
191 | { | |
192 | return table->count; | |
193 | } | |
194 | ||
195 | static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table) | |
196 | { | |
197 | return (table->count > table->n_buckets); | |
198 | } | |
199 | ||
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); | |
a3e82996 PS |
207 | void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow, |
208 | struct sw_flow_key *key, int key_len); | |
ccb1352e | 209 | void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow); |
ccb1352e JG |
210 | |
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]; | |
7d5437c7 PS |
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); | |
ccb1352e JG |
217 | |
218 | #endif /* flow.h */ |