1 /* 2 * Copyright (c) 2007-2014 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/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> 37 38 struct sk_buff; 39 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. 43 */ 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))) 48 49 struct ovs_tunnel_info { 50 struct metadata_dst *tun_dst; 51 }; 52 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)) 56 57 struct sw_flow_key { 58 u8 tun_opts[255]; 59 u8 tun_opts_len; 60 struct ip_tunnel_key tun_key; /* Encapsulating tunnel key. */ 61 struct { 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. */ 68 struct { 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. */ 73 } eth; 74 union { 75 struct { 76 __be32 top_lse; /* top label stack entry */ 77 } mpls; 78 struct { 79 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */ 80 u8 tos; /* IP ToS. */ 81 u8 ttl; /* IP TTL/hop limit. */ 82 u8 frag; /* One of OVS_FRAG_TYPE_*. */ 83 } ip; 84 }; 85 struct { 86 __be16 src; /* TCP/UDP/SCTP source port. */ 87 __be16 dst; /* TCP/UDP/SCTP destination port. */ 88 __be16 flags; /* TCP flags. */ 89 } tp; 90 union { 91 struct { 92 struct { 93 __be32 src; /* IP source address. */ 94 __be32 dst; /* IP destination address. */ 95 } addr; 96 struct { 97 u8 sha[ETH_ALEN]; /* ARP source hardware address. */ 98 u8 tha[ETH_ALEN]; /* ARP target hardware address. */ 99 } arp; 100 } ipv4; 101 struct { 102 struct { 103 struct in6_addr src; /* IPv6 source address. */ 104 struct in6_addr dst; /* IPv6 destination address. */ 105 } addr; 106 __be32 label; /* IPv6 flow label. */ 107 struct { 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. */ 111 } nd; 112 } ipv6; 113 }; 114 struct { 115 /* Connection tracking fields. */ 116 u16 zone; 117 u32 mark; 118 u8 state; 119 struct ovs_key_ct_labels labels; 120 } ct; 121 122 } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */ 123 124 struct sw_flow_key_range { 125 unsigned short int start; 126 unsigned short int end; 127 }; 128 129 struct sw_flow_mask { 130 int ref_count; 131 struct rcu_head rcu; 132 struct list_head list; 133 struct sw_flow_key_range range; 134 struct sw_flow_key key; 135 }; 136 137 struct sw_flow_match { 138 struct sw_flow_key *key; 139 struct sw_flow_key_range range; 140 struct sw_flow_mask *mask; 141 }; 142 143 #define MAX_UFID_LENGTH 16 /* 128 bits */ 144 145 struct sw_flow_id { 146 u32 ufid_len; 147 union { 148 u32 ufid[MAX_UFID_LENGTH / 4]; 149 struct sw_flow_key *unmasked_key; 150 }; 151 }; 152 153 struct sw_flow_actions { 154 struct rcu_head rcu; 155 size_t orig_len; /* From flow_cmd_new netlink actions size */ 156 u32 actions_len; 157 struct nlattr actions[]; 158 }; 159 160 struct flow_stats { 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. */ 166 }; 167 168 struct sw_flow { 169 struct rcu_head rcu; 170 struct { 171 struct hlist_node node[2]; 172 u32 hash; 173 } flow_table, ufid_table; 174 int stats_last_writer; /* NUMA-node id of the last writer on 175 * 'stats[0]'. 176 */ 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'. 185 */ 186 }; 187 188 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) */ 194 195 /* 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 */ 200 } __packed; 201 202 static inline bool ovs_identifier_is_ufid(const struct sw_flow_id *sfid) 203 { 204 return sfid->ufid_len; 205 } 206 207 static inline bool ovs_identifier_is_key(const struct sw_flow_id *sfid) 208 { 209 return !ovs_identifier_is_ufid(sfid); 210 } 211 212 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); 218 219 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, 221 struct sk_buff *skb, 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, 225 struct sk_buff *skb, 226 struct sw_flow_key *key, bool log); 227 228 #endif /* flow.h */ 229