1 /* 2 * Copyright (c) 2007-2011 Nicira, Inc. 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 /* 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; 52 u16 tun_flags; 53 u8 ipv4_tos; 54 u8 ipv4_ttl; 55 }; 56 57 struct sw_flow_key { 58 struct ovs_key_ipv4_tunnel tun_key; /* Encapsulating tunnel key. */ 59 struct { 60 u32 priority; /* Packet QoS priority. */ 61 u32 skb_mark; /* SKB mark. */ 62 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */ 63 } phy; 64 struct { 65 u8 src[ETH_ALEN]; /* Ethernet source address. */ 66 u8 dst[ETH_ALEN]; /* Ethernet destination address. */ 67 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */ 68 __be16 type; /* Ethernet frame type. */ 69 } eth; 70 struct { 71 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */ 72 u8 tos; /* IP ToS. */ 73 u8 ttl; /* IP TTL/hop limit. */ 74 u8 frag; /* One of OVS_FRAG_TYPE_*. */ 75 } ip; 76 union { 77 struct { 78 struct { 79 __be32 src; /* IP source address. */ 80 __be32 dst; /* IP destination address. */ 81 } addr; 82 union { 83 struct { 84 __be16 src; /* TCP/UDP source port. */ 85 __be16 dst; /* TCP/UDP destination port. */ 86 } tp; 87 struct { 88 u8 sha[ETH_ALEN]; /* ARP source hardware address. */ 89 u8 tha[ETH_ALEN]; /* ARP target hardware address. */ 90 } arp; 91 }; 92 } ipv4; 93 struct { 94 struct { 95 struct in6_addr src; /* IPv6 source address. */ 96 struct in6_addr dst; /* IPv6 destination address. */ 97 } addr; 98 __be32 label; /* IPv6 flow label. */ 99 struct { 100 __be16 src; /* TCP/UDP source port. */ 101 __be16 dst; /* TCP/UDP destination port. */ 102 } tp; 103 struct { 104 struct in6_addr target; /* ND target address. */ 105 u8 sll[ETH_ALEN]; /* ND source link layer address. */ 106 u8 tll[ETH_ALEN]; /* ND target link layer address. */ 107 } nd; 108 } ipv6; 109 }; 110 }; 111 112 struct sw_flow { 113 struct rcu_head rcu; 114 struct hlist_node hash_node[2]; 115 u32 hash; 116 117 struct sw_flow_key key; 118 struct sw_flow_actions __rcu *sf_acts; 119 120 spinlock_t lock; /* Lock for values below. */ 121 unsigned long used; /* Last used time (in jiffies). */ 122 u64 packet_count; /* Number of packets matched. */ 123 u64 byte_count; /* Number of bytes matched. */ 124 u8 tcp_flags; /* Union of seen TCP flags. */ 125 }; 126 127 struct arp_eth_header { 128 __be16 ar_hrd; /* format of hardware address */ 129 __be16 ar_pro; /* format of protocol address */ 130 unsigned char ar_hln; /* length of hardware address */ 131 unsigned char ar_pln; /* length of protocol address */ 132 __be16 ar_op; /* ARP opcode (command) */ 133 134 /* Ethernet+IPv4 specific members. */ 135 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ 136 unsigned char ar_sip[4]; /* sender IP address */ 137 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ 138 unsigned char ar_tip[4]; /* target IP address */ 139 } __packed; 140 141 int ovs_flow_init(void); 142 void ovs_flow_exit(void); 143 144 struct sw_flow *ovs_flow_alloc(void); 145 void ovs_flow_deferred_free(struct sw_flow *); 146 void ovs_flow_free(struct sw_flow *flow); 147 148 struct sw_flow_actions *ovs_flow_actions_alloc(int actions_len); 149 void ovs_flow_deferred_free_acts(struct sw_flow_actions *); 150 151 int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *, 152 int *key_lenp); 153 void ovs_flow_used(struct sw_flow *, struct sk_buff *); 154 u64 ovs_flow_used_time(unsigned long flow_jiffies); 155 156 int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *); 157 int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp, 158 const struct nlattr *); 159 int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, 160 const struct nlattr *attr); 161 162 #define MAX_ACTIONS_BUFSIZE (16 * 1024) 163 #define TBL_MIN_BUCKETS 1024 164 165 struct flow_table { 166 struct flex_array *buckets; 167 unsigned int count, n_buckets; 168 struct rcu_head rcu; 169 int node_ver; 170 u32 hash_seed; 171 bool keep_flows; 172 }; 173 174 static inline int ovs_flow_tbl_count(struct flow_table *table) 175 { 176 return table->count; 177 } 178 179 static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table) 180 { 181 return (table->count > table->n_buckets); 182 } 183 184 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table, 185 struct sw_flow_key *key, int len); 186 void ovs_flow_tbl_destroy(struct flow_table *table); 187 void ovs_flow_tbl_deferred_destroy(struct flow_table *table); 188 struct flow_table *ovs_flow_tbl_alloc(int new_size); 189 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table); 190 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table); 191 void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow); 192 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow); 193 u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len); 194 195 struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx); 196 extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1]; 197 int ovs_ipv4_tun_from_nlattr(const struct nlattr *attr, 198 struct ovs_key_ipv4_tunnel *tun_key); 199 int ovs_ipv4_tun_to_nlattr(struct sk_buff *skb, 200 const struct ovs_key_ipv4_tunnel *tun_key); 201 202 #endif /* flow.h */ 203