200 строки
6.3 KiB
C
200 строки
6.3 KiB
C
/*
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* Copyright (c) 2007-2011 Nicira Networks.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#ifndef FLOW_H
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#define FLOW_H 1
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#include <linux/kernel.h>
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#include <linux/netlink.h>
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#include <linux/openvswitch.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/rcupdate.h>
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#include <linux/if_ether.h>
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#include <linux/in6.h>
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#include <linux/jiffies.h>
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#include <linux/time.h>
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#include <linux/flex_array.h>
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#include <net/inet_ecn.h>
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struct sk_buff;
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struct sw_flow_actions {
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struct rcu_head rcu;
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u32 actions_len;
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struct nlattr actions[];
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};
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struct sw_flow_key {
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struct {
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u32 priority; /* Packet QoS priority. */
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u16 in_port; /* Input switch port (or USHRT_MAX). */
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} phy;
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struct {
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u8 src[ETH_ALEN]; /* Ethernet source address. */
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u8 dst[ETH_ALEN]; /* Ethernet destination address. */
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__be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
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__be16 type; /* Ethernet frame type. */
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} eth;
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struct {
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u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
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u8 tos; /* IP ToS. */
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u8 ttl; /* IP TTL/hop limit. */
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u8 frag; /* One of OVS_FRAG_TYPE_*. */
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} ip;
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union {
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struct {
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struct {
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__be32 src; /* IP source address. */
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__be32 dst; /* IP destination address. */
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} addr;
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union {
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struct {
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__be16 src; /* TCP/UDP source port. */
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__be16 dst; /* TCP/UDP destination port. */
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} tp;
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struct {
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u8 sha[ETH_ALEN]; /* ARP source hardware address. */
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u8 tha[ETH_ALEN]; /* ARP target hardware address. */
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} arp;
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};
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} ipv4;
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struct {
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struct {
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struct in6_addr src; /* IPv6 source address. */
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struct in6_addr dst; /* IPv6 destination address. */
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} addr;
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__be32 label; /* IPv6 flow label. */
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struct {
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__be16 src; /* TCP/UDP source port. */
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__be16 dst; /* TCP/UDP destination port. */
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} tp;
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struct {
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struct in6_addr target; /* ND target address. */
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u8 sll[ETH_ALEN]; /* ND source link layer address. */
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u8 tll[ETH_ALEN]; /* ND target link layer address. */
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} nd;
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} ipv6;
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};
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};
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struct sw_flow {
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struct rcu_head rcu;
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struct hlist_node hash_node[2];
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u32 hash;
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struct sw_flow_key key;
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struct sw_flow_actions __rcu *sf_acts;
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spinlock_t lock; /* Lock for values below. */
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unsigned long used; /* Last used time (in jiffies). */
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u64 packet_count; /* Number of packets matched. */
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u64 byte_count; /* Number of bytes matched. */
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u8 tcp_flags; /* Union of seen TCP flags. */
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};
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struct arp_eth_header {
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__be16 ar_hrd; /* format of hardware address */
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__be16 ar_pro; /* format of protocol address */
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unsigned char ar_hln; /* length of hardware address */
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unsigned char ar_pln; /* length of protocol address */
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__be16 ar_op; /* ARP opcode (command) */
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/* Ethernet+IPv4 specific members. */
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unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
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unsigned char ar_sip[4]; /* sender IP address */
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unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
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unsigned char ar_tip[4]; /* target IP address */
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} __packed;
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int ovs_flow_init(void);
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void ovs_flow_exit(void);
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struct sw_flow *ovs_flow_alloc(void);
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void ovs_flow_deferred_free(struct sw_flow *);
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void ovs_flow_free(struct sw_flow *flow);
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struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *);
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void ovs_flow_deferred_free_acts(struct sw_flow_actions *);
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int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
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int *key_lenp);
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void ovs_flow_used(struct sw_flow *, struct sk_buff *);
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u64 ovs_flow_used_time(unsigned long flow_jiffies);
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/* Upper bound on the length of a nlattr-formatted flow key. The longest
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* nlattr-formatted flow key would be:
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*
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* struct pad nl hdr total
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* ------ --- ------ -----
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* OVS_KEY_ATTR_PRIORITY 4 -- 4 8
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* OVS_KEY_ATTR_IN_PORT 4 -- 4 8
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* OVS_KEY_ATTR_ETHERNET 12 -- 4 16
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* OVS_KEY_ATTR_8021Q 4 -- 4 8
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* OVS_KEY_ATTR_ETHERTYPE 2 2 4 8
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* OVS_KEY_ATTR_IPV6 40 -- 4 44
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* OVS_KEY_ATTR_ICMPV6 2 2 4 8
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* OVS_KEY_ATTR_ND 28 -- 4 32
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* -------------------------------------------------
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* total 132
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*/
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#define FLOW_BUFSIZE 132
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int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
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int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
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const struct nlattr *);
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int ovs_flow_metadata_from_nlattrs(u32 *priority, u16 *in_port,
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const struct nlattr *);
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#define TBL_MIN_BUCKETS 1024
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struct flow_table {
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struct flex_array *buckets;
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unsigned int count, n_buckets;
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struct rcu_head rcu;
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int node_ver;
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u32 hash_seed;
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bool keep_flows;
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};
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static inline int ovs_flow_tbl_count(struct flow_table *table)
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{
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return table->count;
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}
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static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
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{
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return (table->count > table->n_buckets);
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}
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struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
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struct sw_flow_key *key, int len);
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void ovs_flow_tbl_destroy(struct flow_table *table);
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void ovs_flow_tbl_deferred_destroy(struct flow_table *table);
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struct flow_table *ovs_flow_tbl_alloc(int new_size);
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struct flow_table *ovs_flow_tbl_expand(struct flow_table *table);
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struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table);
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void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow);
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void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
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u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len);
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struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
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extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];
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#endif /* flow.h */
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