net/openvswitch/flow.h

   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 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 *, __be16 tcp_flags,
 184                            struct sk_buff *);
 185 void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
 186                         unsigned long *used, __be16 *tcp_flags);
 187 void ovs_flow_stats_clear(struct sw_flow *);
 188 u64 ovs_flow_used_time(unsigned long flow_jiffies);
 189
 190 int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *);
 191
 192 #endif /* flow.h */