datapath/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/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
  34 #include <net/inet_ecn.h>
  35 #include <net/ip_tunnels.h>
  36
  37 struct sk_buff;
  38 struct sw_flow_mask;
  39 struct flow_table;
  40
  41 struct sw_flow_actions {
  42         struct rcu_head rcu;
  43         u32 actions_len;
  44         struct nlattr actions[];
  45 };
  46
  47 /* Used to memset ovs_key_ipv4_tunnel padding. */
  48 #define OVS_TUNNEL_KEY_SIZE                                     \
  49         (offsetof(struct ovs_key_ipv4_tunnel, ipv4_ttl) +       \
  50          FIELD_SIZEOF(struct ovs_key_ipv4_tunnel, ipv4_ttl))
  51
  52 struct ovs_key_ipv4_tunnel {
  53         __be64 tun_id;
  54         __be32 ipv4_src;
  55         __be32 ipv4_dst;
  56         __be16 tun_flags;
  57         u8   ipv4_tos;
  58         u8   ipv4_ttl;
  59 };
  60
  61 struct sw_flow_key {
  62         struct ovs_key_ipv4_tunnel tun_key;  /* Encapsulating tunnel key. */
  63         struct {
  64                 u32     priority;       /* Packet QoS priority. */
  65                 u32     skb_mark;       /* SKB mark. */
  66                 u16     in_port;        /* Input switch port (or DP_MAX_PORTS). */
  67         } phy;
  68         struct {
  69                 u8     src[ETH_ALEN];   /* Ethernet source address. */
  70                 u8     dst[ETH_ALEN];   /* Ethernet destination address. */
  71                 __be16 tci;             /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
  72                 __be16 type;            /* Ethernet frame type. */
  73         } eth;
  74         struct {
  75                 u8     proto;           /* IP protocol or lower 8 bits of ARP opcode. */
  76                 u8     tos;             /* IP ToS. */
  77                 u8     ttl;             /* IP TTL/hop limit. */
  78                 u8     frag;            /* One of OVS_FRAG_TYPE_*. */
  79         } ip;
  80         union {
  81                 struct {
  82                         struct {
  83                                 __be32 src;     /* IP source address. */
  84                                 __be32 dst;     /* IP destination address. */
  85                         } addr;
  86                         union {
  87                                 struct {
  88                                         __be16 src;             /* TCP/UDP source port. */
  89                                         __be16 dst;             /* TCP/UDP destination port. */
  90                                 } tp;
  91                                 struct {
  92                                         u8 sha[ETH_ALEN];       /* ARP source hardware address. */
  93                                         u8 tha[ETH_ALEN];       /* ARP target hardware address. */
  94                                 } arp;
  95                         };
  96                 } ipv4;
  97                 struct {
  98                         struct {
  99                                 struct in6_addr src;    /* IPv6 source address. */
 100                                 struct in6_addr dst;    /* IPv6 destination address. */
 101                         } addr;
 102                         __be32 label;                   /* IPv6 flow label. */
 103                         struct {
 104                                 __be16 src;             /* TCP/UDP source port. */
 105                                 __be16 dst;             /* TCP/UDP destination port. */
 106                         } tp;
 107                         struct {
 108                                 struct in6_addr target; /* ND target address. */
 109                                 u8 sll[ETH_ALEN];       /* ND source link layer address. */
 110                                 u8 tll[ETH_ALEN];       /* ND target link layer address. */
 111                         } nd;
 112                 } ipv6;
 113         };
 114 };
 115
 116 struct sw_flow {
 117         struct rcu_head rcu;
 118         struct hlist_node hash_node[2];
 119         u32 hash;
 120
 121         struct sw_flow_key key;
 122         struct sw_flow_key unmasked_key;
 123         struct sw_flow_mask *mask;
 124         struct sw_flow_actions __rcu *sf_acts;
 125
 126         spinlock_t lock;        /* Lock for values below. */
 127         unsigned long used;     /* Last used time (in jiffies). */
 128         u64 packet_count;       /* Number of packets matched. */
 129         u64 byte_count;         /* Number of bytes matched. */
 130         u8 tcp_flags;           /* Union of seen TCP flags. */
 131 };
 132
 133 struct sw_flow_key_range {
 134         size_t start;
 135         size_t end;
 136 };
 137
 138 static inline u16 ovs_sw_flow_key_range_actual_size(const struct sw_flow_key_range *range)
 139 {
 140         return range->end - range->start;
 141 }
 142
 143 struct sw_flow_match {
 144         struct sw_flow_key *key;
 145         struct sw_flow_key_range range;
 146         struct sw_flow_mask *mask;
 147 };
 148
 149 void ovs_match_init(struct sw_flow_match *match,
 150                 struct sw_flow_key *key, struct sw_flow_mask *mask);
 151
 152 struct arp_eth_header {
 153         __be16      ar_hrd;     /* format of hardware address   */
 154         __be16      ar_pro;     /* format of protocol address   */
 155         unsigned char   ar_hln; /* length of hardware address   */
 156         unsigned char   ar_pln; /* length of protocol address   */
 157         __be16      ar_op;      /* ARP opcode (command)     */
 158
 159         /* Ethernet+IPv4 specific members. */
 160         unsigned char       ar_sha[ETH_ALEN];   /* sender hardware address  */
 161         unsigned char       ar_sip[4];          /* sender IP address        */
 162         unsigned char       ar_tha[ETH_ALEN];   /* target hardware address  */
 163         unsigned char       ar_tip[4];          /* target IP address        */
 164 } __packed;
 165
 166 int ovs_flow_init(void);
 167 void ovs_flow_exit(void);
 168
 169 struct sw_flow *ovs_flow_alloc(void);
 170 void ovs_flow_deferred_free(struct sw_flow *);
 171 void ovs_flow_free(struct sw_flow *, bool deferred);
 172
 173 struct sw_flow_actions *ovs_flow_actions_alloc(int actions_len);
 174 void ovs_flow_deferred_free_acts(struct sw_flow_actions *);
 175
 176 int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *);
 177 void ovs_flow_used(struct sw_flow *, struct sk_buff *);
 178 u64 ovs_flow_used_time(unsigned long flow_jiffies);
 179 int ovs_flow_to_nlattrs(const struct sw_flow_key *,
 180                 const struct sw_flow_key *, struct sk_buff *);
 181 int ovs_match_from_nlattrs(struct sw_flow_match *match,
 182                       const struct nlattr *,
 183                       const struct nlattr *);
 184 int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow,
 185                 const struct nlattr *attr);
 186
 187 #define MAX_ACTIONS_BUFSIZE     (32 * 1024)
 188 #define TBL_MIN_BUCKETS         1024
 189
 190 struct flow_table {
 191         struct flex_array *buckets;
 192         unsigned int count, n_buckets;
 193         struct rcu_head rcu;
 194         struct list_head *mask_list;
 195         int node_ver;
 196         u32 hash_seed;
 197         bool keep_flows;
 198 };
 199
 200 static inline int ovs_flow_tbl_count(struct flow_table *table)
 201 {
 202         return table->count;
 203 }
 204
 205 static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
 206 {
 207         return (table->count > table->n_buckets);
 208 }
 209
 210 struct sw_flow *ovs_flow_lookup(struct flow_table *,
 211                                 const struct sw_flow_key *);
 212 struct sw_flow *ovs_flow_lookup_unmasked_key(struct flow_table *table,
 213                                     struct sw_flow_match *match);
 214
 215 void ovs_flow_tbl_destroy(struct flow_table *table, bool deferred);
 216 struct flow_table *ovs_flow_tbl_alloc(int new_size);
 217 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table);
 218 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table);
 219
 220 void ovs_flow_insert(struct flow_table *table, struct sw_flow *flow);
 221 void ovs_flow_remove(struct flow_table *table, struct sw_flow *flow);
 222
 223 struct sw_flow *ovs_flow_dump_next(struct flow_table *table, u32 *bucket, u32 *idx);
 224 extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];
 225 int ipv4_tun_from_nlattr(const struct nlattr *attr,
 226                          struct sw_flow_match *match, bool is_mask);
 227 int ipv4_tun_to_nlattr(struct sk_buff *skb,
 228                         const struct ovs_key_ipv4_tunnel *tun_key,
 229                         const struct ovs_key_ipv4_tunnel *output);
 230
 231 bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
 232                 const struct sw_flow_key *key, int key_len);
 233
 234 struct sw_flow_mask {
 235         int ref_count;
 236         struct rcu_head rcu;
 237         struct list_head list;
 238         struct sw_flow_key_range range;
 239         struct sw_flow_key key;
 240 };
 241
 242 static inline u16
 243 ovs_sw_flow_mask_actual_size(const struct sw_flow_mask *mask)
 244 {
 245         return ovs_sw_flow_key_range_actual_size(&mask->range);
 246 }
 247
 248 static inline u16
 249 ovs_sw_flow_mask_size_roundup(const struct sw_flow_mask *mask)
 250 {
 251         return roundup(ovs_sw_flow_mask_actual_size(mask), sizeof(u32));
 252 }
 253
 254 struct sw_flow_mask *ovs_sw_flow_mask_alloc(void);
 255 void ovs_sw_flow_mask_add_ref(struct sw_flow_mask *);
 256 void ovs_sw_flow_mask_del_ref(struct sw_flow_mask *, bool deferred);
 257 void ovs_sw_flow_mask_insert(struct flow_table *, struct sw_flow_mask *);
 258 struct sw_flow_mask *ovs_sw_flow_mask_find(const struct flow_table *,
 259                 const struct sw_flow_mask *);
 260 void ovs_flow_key_mask(struct sw_flow_key *dst, const struct sw_flow_key *src,
 261                        const struct sw_flow_mask *mask);
 262 #endif /* flow.h */