linux/net/openvswitch/flow.h
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   1/*
   2 * Copyright (c) 2007-2011 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
  35struct sk_buff;
  36
  37struct sw_flow_actions {
  38        struct rcu_head rcu;
  39        u32 actions_len;
  40        struct nlattr actions[];
  41};
  42
  43struct sw_flow_key {
  44        struct {
  45                u32     priority;       /* Packet QoS priority. */
  46                u16     in_port;        /* Input switch port (or USHRT_MAX). */
  47        } phy;
  48        struct {
  49                u8     src[ETH_ALEN];   /* Ethernet source address. */
  50                u8     dst[ETH_ALEN];   /* Ethernet destination address. */
  51                __be16 tci;             /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
  52                __be16 type;            /* Ethernet frame type. */
  53        } eth;
  54        struct {
  55                u8     proto;           /* IP protocol or lower 8 bits of ARP opcode. */
  56                u8     tos;             /* IP ToS. */
  57                u8     ttl;             /* IP TTL/hop limit. */
  58                u8     frag;            /* One of OVS_FRAG_TYPE_*. */
  59        } ip;
  60        union {
  61                struct {
  62                        struct {
  63                                __be32 src;     /* IP source address. */
  64                                __be32 dst;     /* IP destination address. */
  65                        } addr;
  66                        union {
  67                                struct {
  68                                        __be16 src;             /* TCP/UDP source port. */
  69                                        __be16 dst;             /* TCP/UDP destination port. */
  70                                } tp;
  71                                struct {
  72                                        u8 sha[ETH_ALEN];       /* ARP source hardware address. */
  73                                        u8 tha[ETH_ALEN];       /* ARP target hardware address. */
  74                                } arp;
  75                        };
  76                } ipv4;
  77                struct {
  78                        struct {
  79                                struct in6_addr src;    /* IPv6 source address. */
  80                                struct in6_addr dst;    /* IPv6 destination address. */
  81                        } addr;
  82                        __be32 label;                   /* IPv6 flow label. */
  83                        struct {
  84                                __be16 src;             /* TCP/UDP source port. */
  85                                __be16 dst;             /* TCP/UDP destination port. */
  86                        } tp;
  87                        struct {
  88                                struct in6_addr target; /* ND target address. */
  89                                u8 sll[ETH_ALEN];       /* ND source link layer address. */
  90                                u8 tll[ETH_ALEN];       /* ND target link layer address. */
  91                        } nd;
  92                } ipv6;
  93        };
  94};
  95
  96struct sw_flow {
  97        struct rcu_head rcu;
  98        struct hlist_node hash_node[2];
  99        u32 hash;
 100
 101        struct sw_flow_key key;
 102        struct sw_flow_actions __rcu *sf_acts;
 103
 104        spinlock_t lock;        /* Lock for values below. */
 105        unsigned long used;     /* Last used time (in jiffies). */
 106        u64 packet_count;       /* Number of packets matched. */
 107        u64 byte_count;         /* Number of bytes matched. */
 108        u8 tcp_flags;           /* Union of seen TCP flags. */
 109};
 110
 111struct arp_eth_header {
 112        __be16      ar_hrd;     /* format of hardware address   */
 113        __be16      ar_pro;     /* format of protocol address   */
 114        unsigned char   ar_hln; /* length of hardware address   */
 115        unsigned char   ar_pln; /* length of protocol address   */
 116        __be16      ar_op;      /* ARP opcode (command)     */
 117
 118        /* Ethernet+IPv4 specific members. */
 119        unsigned char       ar_sha[ETH_ALEN];   /* sender hardware address  */
 120        unsigned char       ar_sip[4];          /* sender IP address        */
 121        unsigned char       ar_tha[ETH_ALEN];   /* target hardware address  */
 122        unsigned char       ar_tip[4];          /* target IP address        */
 123} __packed;
 124
 125int ovs_flow_init(void);
 126void ovs_flow_exit(void);
 127
 128struct sw_flow *ovs_flow_alloc(void);
 129void ovs_flow_deferred_free(struct sw_flow *);
 130void ovs_flow_free(struct sw_flow *flow);
 131
 132struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *);
 133void ovs_flow_deferred_free_acts(struct sw_flow_actions *);
 134
 135int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
 136                     int *key_lenp);
 137void ovs_flow_used(struct sw_flow *, struct sk_buff *);
 138u64 ovs_flow_used_time(unsigned long flow_jiffies);
 139
 140/* Upper bound on the length of a nlattr-formatted flow key.  The longest
 141 * nlattr-formatted flow key would be:
 142 *
 143 *                         struct  pad  nl hdr  total
 144 *                         ------  ---  ------  -----
 145 *  OVS_KEY_ATTR_PRIORITY      4    --     4      8
 146 *  OVS_KEY_ATTR_IN_PORT       4    --     4      8
 147 *  OVS_KEY_ATTR_ETHERNET     12    --     4     16
 148 *  OVS_KEY_ATTR_ETHERTYPE     2     2     4      8  (outer VLAN ethertype)
 149 *  OVS_KEY_ATTR_8021Q         4    --     4      8
 150 *  OVS_KEY_ATTR_ENCAP         0    --     4      4  (VLAN encapsulation)
 151 *  OVS_KEY_ATTR_ETHERTYPE     2     2     4      8  (inner VLAN ethertype)
 152 *  OVS_KEY_ATTR_IPV6         40    --     4     44
 153 *  OVS_KEY_ATTR_ICMPV6        2     2     4      8
 154 *  OVS_KEY_ATTR_ND           28    --     4     32
 155 *  -------------------------------------------------
 156 *  total                                       144
 157 */
 158#define FLOW_BUFSIZE 144
 159
 160int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
 161int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
 162                      const struct nlattr *);
 163int ovs_flow_metadata_from_nlattrs(u32 *priority, u16 *in_port,
 164                               const struct nlattr *);
 165
 166#define TBL_MIN_BUCKETS         1024
 167
 168struct flow_table {
 169        struct flex_array *buckets;
 170        unsigned int count, n_buckets;
 171        struct rcu_head rcu;
 172        int node_ver;
 173        u32 hash_seed;
 174        bool keep_flows;
 175};
 176
 177static inline int ovs_flow_tbl_count(struct flow_table *table)
 178{
 179        return table->count;
 180}
 181
 182static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
 183{
 184        return (table->count > table->n_buckets);
 185}
 186
 187struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
 188                                    struct sw_flow_key *key, int len);
 189void ovs_flow_tbl_destroy(struct flow_table *table);
 190void ovs_flow_tbl_deferred_destroy(struct flow_table *table);
 191struct flow_table *ovs_flow_tbl_alloc(int new_size);
 192struct flow_table *ovs_flow_tbl_expand(struct flow_table *table);
 193struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table);
 194void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow);
 195void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
 196u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len);
 197
 198struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
 199extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];
 200
 201#endif /* flow.h */
 202
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