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 struct sw_flow_key { 44 struct { 45 u32 priority; /* Packet QoS priority. */ 46 u32 skb_mark; /* SKB mark. */ 47 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */ 48 } phy; 49 struct { 50 u8 src[ETH_ALEN]; /* Ethernet source address. */ 51 u8 dst[ETH_ALEN]; /* Ethernet destination address. */ 52 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */ 53 __be16 type; /* Ethernet frame type. */ 54 } eth; 55 struct { 56 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */ 57 u8 tos; /* IP ToS. */ 58 u8 ttl; /* IP TTL/hop limit. */ 59 u8 frag; /* One of OVS_FRAG_TYPE_*. */ 60 } ip; 61 union { 62 struct { 63 struct { 64 __be32 src; /* IP source address. */ 65 __be32 dst; /* IP destination address. */ 66 } addr; 67 union { 68 struct { 69 __be16 src; /* TCP/UDP source port. */ 70 __be16 dst; /* TCP/UDP destination port. */ 71 } tp; 72 struct { 73 u8 sha[ETH_ALEN]; /* ARP source hardware address. */ 74 u8 tha[ETH_ALEN]; /* ARP target hardware address. */ 75 } arp; 76 }; 77 } ipv4; 78 struct { 79 struct { 80 struct in6_addr src; /* IPv6 source address. */ 81 struct in6_addr dst; /* IPv6 destination address. */ 82 } addr; 83 __be32 label; /* IPv6 flow label. */ 84 struct { 85 __be16 src; /* TCP/UDP source port. */ 86 __be16 dst; /* TCP/UDP destination port. */ 87 } tp; 88 struct { 89 struct in6_addr target; /* ND target address. */ 90 u8 sll[ETH_ALEN]; /* ND source link layer address. */ 91 u8 tll[ETH_ALEN]; /* ND target link layer address. */ 92 } nd; 93 } ipv6; 94 }; 95 }; 96 97 struct sw_flow { 98 struct rcu_head rcu; 99 struct hlist_node hash_node[2]; 100 u32 hash; 101 102 struct sw_flow_key key; 103 struct sw_flow_actions __rcu *sf_acts; 104 105 spinlock_t lock; /* Lock for values below. */ 106 unsigned long used; /* Last used time (in jiffies). */ 107 u64 packet_count; /* Number of packets matched. */ 108 u64 byte_count; /* Number of bytes matched. */ 109 u8 tcp_flags; /* Union of seen TCP flags. */ 110 }; 111 112 struct arp_eth_header { 113 __be16 ar_hrd; /* format of hardware address */ 114 __be16 ar_pro; /* format of protocol address */ 115 unsigned char ar_hln; /* length of hardware address */ 116 unsigned char ar_pln; /* length of protocol address */ 117 __be16 ar_op; /* ARP opcode (command) */ 118 119 /* Ethernet+IPv4 specific members. */ 120 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ 121 unsigned char ar_sip[4]; /* sender IP address */ 122 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ 123 unsigned char ar_tip[4]; /* target IP address */ 124 } __packed; 125 126 int ovs_flow_init(void); 127 void ovs_flow_exit(void); 128 129 struct sw_flow *ovs_flow_alloc(void); 130 void ovs_flow_deferred_free(struct sw_flow *); 131 void ovs_flow_free(struct sw_flow *flow); 132 133 struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *); 134 void ovs_flow_deferred_free_acts(struct sw_flow_actions *); 135 136 int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *, 137 int *key_lenp); 138 void ovs_flow_used(struct sw_flow *, struct sk_buff *); 139 u64 ovs_flow_used_time(unsigned long flow_jiffies); 140 141 /* Upper bound on the length of a nlattr-formatted flow key. The longest 142 * nlattr-formatted flow key would be: 143 * 144 * struct pad nl hdr total 145 * ------ --- ------ ----- 146 * OVS_KEY_ATTR_PRIORITY 4 -- 4 8 147 * OVS_KEY_ATTR_IN_PORT 4 -- 4 8 148 * OVS_KEY_ATTR_SKB_MARK 4 -- 4 8 149 * OVS_KEY_ATTR_ETHERNET 12 -- 4 16 150 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (outer VLAN ethertype) 151 * OVS_KEY_ATTR_8021Q 4 -- 4 8 152 * OVS_KEY_ATTR_ENCAP 0 -- 4 4 (VLAN encapsulation) 153 * OVS_KEY_ATTR_ETHERTYPE 2 2 4 8 (inner VLAN ethertype) 154 * OVS_KEY_ATTR_IPV6 40 -- 4 44 155 * OVS_KEY_ATTR_ICMPV6 2 2 4 8 156 * OVS_KEY_ATTR_ND 28 -- 4 32 157 * ------------------------------------------------- 158 * total 152 159 */ 160 #define FLOW_BUFSIZE 152 161 162 int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *); 163 int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp, 164 const struct nlattr *); 165 int ovs_flow_metadata_from_nlattrs(u32 *priority, u32 *mark, u16 *in_port, 166 const struct nlattr *); 167 168 #define MAX_ACTIONS_BUFSIZE (16 * 1024) 169 #define TBL_MIN_BUCKETS 1024 170 171 struct flow_table { 172 struct flex_array *buckets; 173 unsigned int count, n_buckets; 174 struct rcu_head rcu; 175 int node_ver; 176 u32 hash_seed; 177 bool keep_flows; 178 }; 179 180 static inline int ovs_flow_tbl_count(struct flow_table *table) 181 { 182 return table->count; 183 } 184 185 static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table) 186 { 187 return (table->count > table->n_buckets); 188 } 189 190 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table, 191 struct sw_flow_key *key, int len); 192 void ovs_flow_tbl_destroy(struct flow_table *table); 193 void ovs_flow_tbl_deferred_destroy(struct flow_table *table); 194 struct flow_table *ovs_flow_tbl_alloc(int new_size); 195 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table); 196 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table); 197 void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow); 198 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow); 199 u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len); 200 201 struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx); 202 extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1]; 203 204 #endif /* flow.h */ 205