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 36 struct sk_buff; 37 38 /* Used to memset ovs_key_ipv4_tunnel padding. */ 39 #define OVS_TUNNEL_KEY_SIZE \ 40 (offsetof(struct ovs_key_ipv4_tunnel, ipv4_ttl) + \ 41 FIELD_SIZEOF(struct ovs_key_ipv4_tunnel, ipv4_ttl)) 42 43 struct ovs_key_ipv4_tunnel { 44 __be64 tun_id; 45 __be32 ipv4_src; 46 __be32 ipv4_dst; 47 __be16 tun_flags; 48 u8 ipv4_tos; 49 u8 ipv4_ttl; 50 } __packed __aligned(4); /* Minimize padding. */ 51 52 struct ovs_tunnel_info { 53 struct ovs_key_ipv4_tunnel tunnel; 54 struct geneve_opt *options; 55 u8 options_len; 56 }; 57 58 /* Store options at the end of the array if they are less than the 59 * maximum size. This allows us to get the benefits of variable length 60 * matching for small options. 61 */ 62 #define GENEVE_OPTS(flow_key, opt_len) \ 63 ((struct geneve_opt *)((flow_key)->tun_opts + \ 64 FIELD_SIZEOF(struct sw_flow_key, tun_opts) - \ 65 opt_len)) 66 67 static inline void ovs_flow_tun_info_init(struct ovs_tunnel_info *tun_info, 68 const struct iphdr *iph, 69 __be64 tun_id, __be16 tun_flags, 70 struct geneve_opt *opts, 71 u8 opts_len) 72 { 73 tun_info->tunnel.tun_id = tun_id; 74 tun_info->tunnel.ipv4_src = iph->saddr; 75 tun_info->tunnel.ipv4_dst = iph->daddr; 76 tun_info->tunnel.ipv4_tos = iph->tos; 77 tun_info->tunnel.ipv4_ttl = iph->ttl; 78 tun_info->tunnel.tun_flags = tun_flags; 79 80 /* clear struct padding. */ 81 memset((unsigned char *)&tun_info->tunnel + OVS_TUNNEL_KEY_SIZE, 0, 82 sizeof(tun_info->tunnel) - OVS_TUNNEL_KEY_SIZE); 83 84 tun_info->options = opts; 85 tun_info->options_len = opts_len; 86 } 87 88 struct sw_flow_key { 89 u8 tun_opts[255]; 90 u8 tun_opts_len; 91 struct ovs_key_ipv4_tunnel tun_key; /* Encapsulating tunnel key. */ 92 struct { 93 u32 priority; /* Packet QoS priority. */ 94 u32 skb_mark; /* SKB mark. */ 95 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */ 96 } __packed phy; /* Safe when right after 'tun_key'. */ 97 u32 ovs_flow_hash; /* Datapath computed hash value. */ 98 u32 recirc_id; /* Recirculation ID. */ 99 struct { 100 u8 src[ETH_ALEN]; /* Ethernet source address. */ 101 u8 dst[ETH_ALEN]; /* Ethernet destination address. */ 102 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */ 103 __be16 type; /* Ethernet frame type. */ 104 } eth; 105 struct { 106 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */ 107 u8 tos; /* IP ToS. */ 108 u8 ttl; /* IP TTL/hop limit. */ 109 u8 frag; /* One of OVS_FRAG_TYPE_*. */ 110 } ip; 111 struct { 112 __be16 src; /* TCP/UDP/SCTP source port. */ 113 __be16 dst; /* TCP/UDP/SCTP destination port. */ 114 __be16 flags; /* TCP flags. */ 115 } tp; 116 union { 117 struct { 118 struct { 119 __be32 src; /* IP source address. */ 120 __be32 dst; /* IP destination address. */ 121 } addr; 122 struct { 123 u8 sha[ETH_ALEN]; /* ARP source hardware address. */ 124 u8 tha[ETH_ALEN]; /* ARP target hardware address. */ 125 } arp; 126 } ipv4; 127 struct { 128 struct { 129 struct in6_addr src; /* IPv6 source address. */ 130 struct in6_addr dst; /* IPv6 destination address. */ 131 } addr; 132 __be32 label; /* IPv6 flow label. */ 133 struct { 134 struct in6_addr target; /* ND target address. */ 135 u8 sll[ETH_ALEN]; /* ND source link layer address. */ 136 u8 tll[ETH_ALEN]; /* ND target link layer address. */ 137 } nd; 138 } ipv6; 139 }; 140 } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */ 141 142 struct sw_flow_key_range { 143 unsigned short int start; 144 unsigned short int end; 145 }; 146 147 struct sw_flow_mask { 148 int ref_count; 149 struct rcu_head rcu; 150 struct list_head list; 151 struct sw_flow_key_range range; 152 struct sw_flow_key key; 153 }; 154 155 struct sw_flow_match { 156 struct sw_flow_key *key; 157 struct sw_flow_key_range range; 158 struct sw_flow_mask *mask; 159 }; 160 161 struct sw_flow_actions { 162 struct rcu_head rcu; 163 u32 actions_len; 164 struct nlattr actions[]; 165 }; 166 167 struct flow_stats { 168 u64 packet_count; /* Number of packets matched. */ 169 u64 byte_count; /* Number of bytes matched. */ 170 unsigned long used; /* Last used time (in jiffies). */ 171 spinlock_t lock; /* Lock for atomic stats update. */ 172 __be16 tcp_flags; /* Union of seen TCP flags. */ 173 }; 174 175 struct sw_flow { 176 struct rcu_head rcu; 177 struct hlist_node hash_node[2]; 178 u32 hash; 179 int stats_last_writer; /* NUMA-node id of the last writer on 180 * 'stats[0]'. 181 */ 182 struct sw_flow_key key; 183 struct sw_flow_key unmasked_key; 184 struct sw_flow_mask *mask; 185 struct sw_flow_actions __rcu *sf_acts; 186 struct flow_stats __rcu *stats[]; /* One for each NUMA node. First one 187 * is allocated at flow creation time, 188 * the rest are allocated on demand 189 * while holding the 'stats[0].lock'. 190 */ 191 }; 192 193 struct arp_eth_header { 194 __be16 ar_hrd; /* format of hardware address */ 195 __be16 ar_pro; /* format of protocol address */ 196 unsigned char ar_hln; /* length of hardware address */ 197 unsigned char ar_pln; /* length of protocol address */ 198 __be16 ar_op; /* ARP opcode (command) */ 199 200 /* Ethernet+IPv4 specific members. */ 201 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ 202 unsigned char ar_sip[4]; /* sender IP address */ 203 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ 204 unsigned char ar_tip[4]; /* target IP address */ 205 } __packed; 206 207 void ovs_flow_stats_update(struct sw_flow *, __be16 tcp_flags, 208 struct sk_buff *); 209 void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *, 210 unsigned long *used, __be16 *tcp_flags); 211 void ovs_flow_stats_clear(struct sw_flow *); 212 u64 ovs_flow_used_time(unsigned long flow_jiffies); 213 214 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key); 215 int ovs_flow_key_extract(struct ovs_tunnel_info *tun_info, struct sk_buff *skb, 216 struct sw_flow_key *key); 217 /* Extract key from packet coming from userspace. */ 218 int ovs_flow_key_extract_userspace(const struct nlattr *attr, 219 struct sk_buff *skb, 220 struct sw_flow_key *key); 221 222 #endif /* flow.h */ 223