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/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 /* Used to memset ovs_key_ipv4_tunnel padding. */ 38 #define OVS_TUNNEL_KEY_SIZE \ 39 (offsetof(struct ovs_key_ipv4_tunnel, ipv4_ttl) + \ 40 FIELD_SIZEOF(struct ovs_key_ipv4_tunnel, ipv4_ttl)) 41 42 struct ovs_key_ipv4_tunnel { 43 __be64 tun_id; 44 __be32 ipv4_src; 45 __be32 ipv4_dst; 46 __be16 tun_flags; 47 u8 ipv4_tos; 48 u8 ipv4_ttl; 49 }; 50 51 static inline void ovs_flow_tun_key_init(struct ovs_key_ipv4_tunnel *tun_key, 52 const struct iphdr *iph, __be64 tun_id, 53 __be16 tun_flags) 54 { 55 tun_key->tun_id = tun_id; 56 tun_key->ipv4_src = iph->saddr; 57 tun_key->ipv4_dst = iph->daddr; 58 tun_key->ipv4_tos = iph->tos; 59 tun_key->ipv4_ttl = iph->ttl; 60 tun_key->tun_flags = tun_flags; 61 62 /* clear struct padding. */ 63 memset((unsigned char *) tun_key + OVS_TUNNEL_KEY_SIZE, 0, 64 sizeof(*tun_key) - OVS_TUNNEL_KEY_SIZE); 65 } 66 67 struct sw_flow_key { 68 struct ovs_key_ipv4_tunnel tun_key; /* Encapsulating tunnel key. */ 69 struct { 70 u32 priority; /* Packet QoS priority. */ 71 u32 skb_mark; /* SKB mark. */ 72 u16 in_port; /* Input switch port (or DP_MAX_PORTS). */ 73 } phy; 74 struct { 75 u8 src[ETH_ALEN]; /* Ethernet source address. */ 76 u8 dst[ETH_ALEN]; /* Ethernet destination address. */ 77 __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */ 78 __be16 type; /* Ethernet frame type. */ 79 } eth; 80 struct { 81 u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */ 82 u8 tos; /* IP ToS. */ 83 u8 ttl; /* IP TTL/hop limit. */ 84 u8 frag; /* One of OVS_FRAG_TYPE_*. */ 85 } ip; 86 union { 87 struct { 88 struct { 89 __be32 src; /* IP source address. */ 90 __be32 dst; /* IP destination address. */ 91 } addr; 92 union { 93 struct { 94 __be16 src; /* TCP/UDP/SCTP source port. */ 95 __be16 dst; /* TCP/UDP/SCTP destination port. */ 96 __be16 flags; /* TCP flags. */ 97 } tp; 98 struct { 99 u8 sha[ETH_ALEN]; /* ARP source hardware address. */ 100 u8 tha[ETH_ALEN]; /* ARP target hardware address. */ 101 } arp; 102 }; 103 } ipv4; 104 struct { 105 struct { 106 struct in6_addr src; /* IPv6 source address. */ 107 struct in6_addr dst; /* IPv6 destination address. */ 108 } addr; 109 __be32 label; /* IPv6 flow label. */ 110 struct { 111 __be16 src; /* TCP/UDP/SCTP source port. */ 112 __be16 dst; /* TCP/UDP/SCTP destination port. */ 113 __be16 flags; /* TCP flags. */ 114 } tp; 115 struct { 116 struct in6_addr target; /* ND target address. */ 117 u8 sll[ETH_ALEN]; /* ND source link layer address. */ 118 u8 tll[ETH_ALEN]; /* ND target link layer address. */ 119 } nd; 120 } ipv6; 121 }; 122 } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */ 123 124 struct sw_flow_key_range { 125 size_t start; 126 size_t 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 struct sw_flow_actions { 144 struct rcu_head rcu; 145 u32 actions_len; 146 struct nlattr actions[]; 147 }; 148 149 struct sw_flow { 150 struct rcu_head rcu; 151 struct hlist_node hash_node[2]; 152 u32 hash; 153 154 struct sw_flow_key key; 155 struct sw_flow_key unmasked_key; 156 struct sw_flow_mask *mask; 157 struct sw_flow_actions __rcu *sf_acts; 158 159 spinlock_t lock; /* Lock for values below. */ 160 unsigned long used; /* Last used time (in jiffies). */ 161 u64 packet_count; /* Number of packets matched. */ 162 u64 byte_count; /* Number of bytes matched. */ 163 __be16 tcp_flags; /* Union of seen TCP flags. */ 164 }; 165 166 struct arp_eth_header { 167 __be16 ar_hrd; /* format of hardware address */ 168 __be16 ar_pro; /* format of protocol address */ 169 unsigned char ar_hln; /* length of hardware address */ 170 unsigned char ar_pln; /* length of protocol address */ 171 __be16 ar_op; /* ARP opcode (command) */ 172 173 /* Ethernet+IPv4 specific members. */ 174 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ 175 unsigned char ar_sip[4]; /* sender IP address */ 176 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ 177 unsigned char ar_tip[4]; /* target IP address */ 178 } __packed; 179 180 void ovs_flow_used(struct sw_flow *, struct sk_buff *); 181 u64 ovs_flow_used_time(unsigned long flow_jiffies); 182 183 int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *); 184 185 #endif /* flow.h */ 186