net/openvswitch/flow.h

   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 };
  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         } phy;
  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         union {
  88                 struct {
  89                         struct {
  90                                 __be32 src;     /* IP source address. */
  91                                 __be32 dst;     /* IP destination address. */
  92                         } addr;
  93                         union {
  94                                 struct {
  95                                         __be16 src;             /* TCP/UDP/SCTP source port. */
  96                                         __be16 dst;             /* TCP/UDP/SCTP destination port. */
  97                                         __be16 flags;           /* TCP flags. */
  98                                 } tp;
  99                                 struct {
 100                                         u8 sha[ETH_ALEN];       /* ARP source hardware address. */
 101                                         u8 tha[ETH_ALEN];       /* ARP target hardware address. */
 102                                 } arp;
 103                         };
 104                 } ipv4;
 105                 struct {
 106                         struct {
 107                                 struct in6_addr src;    /* IPv6 source address. */
 108                                 struct in6_addr dst;    /* IPv6 destination address. */
 109                         } addr;
 110                         __be32 label;                   /* IPv6 flow label. */
 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                         struct {
 117                                 struct in6_addr target; /* ND target address. */
 118                                 u8 sll[ETH_ALEN];       /* ND source link layer address. */
 119                                 u8 tll[ETH_ALEN];       /* ND target link layer address. */
 120                         } nd;
 121                 } ipv6;
 122         };
 123 } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
 124
 125 struct sw_flow_key_range {
 126         unsigned short int start;
 127         unsigned short int end;
 128 };
 129
 130 struct sw_flow_mask {
 131         int ref_count;
 132         struct rcu_head rcu;
 133         struct list_head list;
 134         struct sw_flow_key_range range;
 135         struct sw_flow_key key;
 136 };
 137
 138 struct sw_flow_match {
 139         struct sw_flow_key *key;
 140         struct sw_flow_key_range range;
 141         struct sw_flow_mask *mask;
 142 };
 143
 144 struct sw_flow_actions {
 145         struct rcu_head rcu;
 146         u32 actions_len;
 147         struct nlattr actions[];
 148 };
 149
 150 struct flow_stats {
 151         u64 packet_count;               /* Number of packets matched. */
 152         u64 byte_count;                 /* Number of bytes matched. */
 153         unsigned long used;             /* Last used time (in jiffies). */
 154         spinlock_t lock;                /* Lock for atomic stats update. */
 155         __be16 tcp_flags;               /* Union of seen TCP flags. */
 156 };
 157
 158 struct sw_flow_stats {
 159         bool is_percpu;
 160         union {
 161                 struct flow_stats *stat;
 162                 struct flow_stats __percpu *cpu_stats;
 163         };
 164 };
 165
 166 struct sw_flow {
 167         struct rcu_head rcu;
 168         struct hlist_node hash_node[2];
 169         u32 hash;
 170
 171         struct sw_flow_key key;
 172         struct sw_flow_key unmasked_key;
 173         struct sw_flow_mask *mask;
 174         struct sw_flow_actions __rcu *sf_acts;
 175         struct sw_flow_stats stats;
 176 };
 177
 178 struct arp_eth_header {
 179         __be16      ar_hrd;     /* format of hardware address   */
 180         __be16      ar_pro;     /* format of protocol address   */
 181         unsigned char   ar_hln; /* length of hardware address   */
 182         unsigned char   ar_pln; /* length of protocol address   */
 183         __be16      ar_op;      /* ARP opcode (command)     */
 184
 185         /* Ethernet+IPv4 specific members. */
 186         unsigned char       ar_sha[ETH_ALEN];   /* sender hardware address  */
 187         unsigned char       ar_sip[4];          /* sender IP address        */
 188         unsigned char       ar_tha[ETH_ALEN];   /* target hardware address  */
 189         unsigned char       ar_tip[4];          /* target IP address        */
 190 } __packed;
 191
 192 void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb);
 193 void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *stats,
 194                         unsigned long *used, __be16 *tcp_flags);
 195 void ovs_flow_stats_clear(struct sw_flow *flow);
 196 u64 ovs_flow_used_time(unsigned long flow_jiffies);
 197
 198 int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *);
 199
 200 #endif /* flow.h */