1 /* 2 * Copyright (c) 2007-2013 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 static inline void ovs_flow_tun_key_init(struct ovs_key_ipv4_tunnel *tun_key, 53 const struct iphdr *iph, __be64 tun_id, 54 __be16 tun_flags) 55 { 56 tun_key->tun_id = tun_id; 57 tun_key->ipv4_src = iph->saddr; 58 tun_key->ipv4_dst = iph->daddr; 59 tun_key->ipv4_tos = iph->tos; 60 tun_key->ipv4_ttl = iph->ttl; 61 tun_key->tun_flags = tun_flags; 62 63 /* clear struct padding. */ 64 memset((unsigned char *) tun_key + OVS_TUNNEL_KEY_SIZE, 0, 65 sizeof(*tun_key) - OVS_TUNNEL_KEY_SIZE); 66 } 67 68 struct sw_flow_key { 69 struct ovs_key_ipv4_tunnel tun_key; /* Encapsulating tunnel key. */ 70 struct { 71 u32 priority; /* Packet QoS priority. */ 72 u32 skb_mark; /* SKB mark. */ 73 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */ 74 } __packed phy; /* Safe when right after 'tun_key'. */ 75 struct { 76 u8 src[ETH_ALEN]; /* Ethernet source address. */ 77 u8 dst[ETH_ALEN]; /* Ethernet destination address. */ 78 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */ 79 __be16 type; /* Ethernet frame type. */ 80 } eth; 81 struct { 82 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */ 83 u8 tos; /* IP ToS. */ 84 u8 ttl; /* IP TTL/hop limit. */ 85 u8 frag; /* One of OVS_FRAG_TYPE_*. */ 86 } ip; 87 struct { 88 __be16 src; /* TCP/UDP/SCTP source port. */ 89 __be16 dst; /* TCP/UDP/SCTP destination port. */ 90 __be16 flags; /* TCP flags. */ 91 } tp; 92 union { 93 struct { 94 struct { 95 __be32 src; /* IP source address. */ 96 __be32 dst; /* IP destination address. */ 97 } addr; 98 struct { 99 u8 sha[ETH_ALEN]; /* ARP source hardware address. */ 100 u8 tha[ETH_ALEN]; /* ARP target hardware address. */ 101 } arp; 102 } ipv4; 103 struct { 104 struct { 105 struct in6_addr src; /* IPv6 source address. */ 106 struct in6_addr dst; /* IPv6 destination address. */ 107 } addr; 108 __be32 label; /* IPv6 flow label. */ 109 struct { 110 struct in6_addr target; /* ND target address. */ 111 u8 sll[ETH_ALEN]; /* ND source link layer address. */ 112 u8 tll[ETH_ALEN]; /* ND target link layer address. */ 113 } nd; 114 } ipv6; 115 }; 116 } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */ 117 118 struct sw_flow_key_range { 119 unsigned short int start; 120 unsigned short int end; 121 }; 122 123 struct sw_flow_mask { 124 int ref_count; 125 struct rcu_head rcu; 126 struct list_head list; 127 struct sw_flow_key_range range; 128 struct sw_flow_key key; 129 }; 130 131 struct sw_flow_match { 132 struct sw_flow_key *key; 133 struct sw_flow_key_range range; 134 struct sw_flow_mask *mask; 135 }; 136 137 struct sw_flow_actions { 138 struct rcu_head rcu; 139 u32 actions_len; 140 struct nlattr actions[]; 141 }; 142 143 struct flow_stats { 144 u64 packet_count; /* Number of packets matched. */ 145 u64 byte_count; /* Number of bytes matched. */ 146 unsigned long used; /* Last used time (in jiffies). */ 147 spinlock_t lock; /* Lock for atomic stats update. */ 148 __be16 tcp_flags; /* Union of seen TCP flags. */ 149 }; 150 151 struct sw_flow { 152 struct rcu_head rcu; 153 struct hlist_node hash_node[2]; 154 u32 hash; 155 int stats_last_writer; /* NUMA-node id of the last writer on 156 * 'stats[0]'. 157 */ 158 struct sw_flow_key key; 159 struct sw_flow_key unmasked_key; 160 struct sw_flow_mask *mask; 161 struct sw_flow_actions __rcu *sf_acts; 162 struct flow_stats __rcu *stats[]; /* One for each NUMA node. First one 163 * is allocated at flow creation time, 164 * the rest are allocated on demand 165 * while holding the 'stats[0].lock'. 166 */ 167 }; 168 169 struct arp_eth_header { 170 __be16 ar_hrd; /* format of hardware address */ 171 __be16 ar_pro; /* format of protocol address */ 172 unsigned char ar_hln; /* length of hardware address */ 173 unsigned char ar_pln; /* length of protocol address */ 174 __be16 ar_op; /* ARP opcode (command) */ 175 176 /* Ethernet+IPv4 specific members. */ 177 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ 178 unsigned char ar_sip[4]; /* sender IP address */ 179 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ 180 unsigned char ar_tip[4]; /* target IP address */ 181 } __packed; 182 183 void ovs_flow_stats_update(struct sw_flow *, struct sk_buff *); 184 void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *, 185 unsigned long *used, __be16 *tcp_flags); 186 void ovs_flow_stats_clear(struct sw_flow *); 187 u64 ovs_flow_used_time(unsigned long flow_jiffies); 188 189 int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *); 190 191 #endif /* flow.h */ 192