[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / openvswitch / flow.h

/*
 * Copyright (c) 2007-2011 Nicira Networks.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#ifndef FLOW_H
#define FLOW_H 1

#include <linux/kernel.h>
#include <linux/netlink.h>
#include <linux/openvswitch.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/rcupdate.h>
#include <linux/if_ether.h>
#include <linux/in6.h>
#include <linux/jiffies.h>
#include <linux/time.h>
#include <linux/flex_array.h>
#include <net/inet_ecn.h>

struct sk_buff;

struct sw_flow_actions {
	struct rcu_head rcu;
	u32 actions_len;
	struct nlattr actions[];
};

struct sw_flow_key {
	struct {
		u32	priority;	/* Packet QoS priority. */
		u16	in_port;	/* Input switch port (or USHRT_MAX). */
	} phy;
	struct {
		u8     src[ETH_ALEN];	/* Ethernet source address. */
		u8     dst[ETH_ALEN];	/* Ethernet destination address. */
		__be16 tci;		/* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
		__be16 type;		/* Ethernet frame type. */
	} eth;
	struct {
		u8     proto;		/* IP protocol or lower 8 bits of ARP opcode. */
		u8     tos;		/* IP ToS. */
		u8     ttl;		/* IP TTL/hop limit. */
		u8     frag;		/* One of OVS_FRAG_TYPE_*. */
	} ip;
	union {
		struct {
			struct {
				__be32 src;	/* IP source address. */
				__be32 dst;	/* IP destination address. */
			} addr;
			union {
				struct {
					__be16 src;		/* TCP/UDP source port. */
					__be16 dst;		/* TCP/UDP destination port. */
				} tp;
				struct {
					u8 sha[ETH_ALEN];	/* ARP source hardware address. */
					u8 tha[ETH_ALEN];	/* ARP target hardware address. */
				} arp;
			};
		} ipv4;
		struct {
			struct {
				struct in6_addr src;	/* IPv6 source address. */
				struct in6_addr dst;	/* IPv6 destination address. */
			} addr;
			__be32 label;			/* IPv6 flow label. */
			struct {
				__be16 src;		/* TCP/UDP source port. */
				__be16 dst;		/* TCP/UDP destination port. */
			} tp;
			struct {
				struct in6_addr target;	/* ND target address. */
				u8 sll[ETH_ALEN];	/* ND source link layer address. */
				u8 tll[ETH_ALEN];	/* ND target link layer address. */
			} nd;
		} ipv6;
	};
};

struct sw_flow {
	struct rcu_head rcu;
	struct hlist_node hash_node[2];
	u32 hash;

	struct sw_flow_key key;
	struct sw_flow_actions __rcu *sf_acts;

	spinlock_t lock;	/* Lock for values below. */
	unsigned long used;	/* Last used time (in jiffies). */
	u64 packet_count;	/* Number of packets matched. */
	u64 byte_count;		/* Number of bytes matched. */
	u8 tcp_flags;		/* Union of seen TCP flags. */
};

struct arp_eth_header {
	__be16      ar_hrd;	/* format of hardware address   */
	__be16      ar_pro;	/* format of protocol address   */
	unsigned char   ar_hln;	/* length of hardware address   */
	unsigned char   ar_pln;	/* length of protocol address   */
	__be16      ar_op;	/* ARP opcode (command)     */

	/* Ethernet+IPv4 specific members. */
	unsigned char       ar_sha[ETH_ALEN];	/* sender hardware address  */
	unsigned char       ar_sip[4];		/* sender IP address        */
	unsigned char       ar_tha[ETH_ALEN];	/* target hardware address  */
	unsigned char       ar_tip[4];		/* target IP address        */
} __packed;

int ovs_flow_init(void);
void ovs_flow_exit(void);

struct sw_flow *ovs_flow_alloc(void);
void ovs_flow_deferred_free(struct sw_flow *);
void ovs_flow_free(struct sw_flow *flow);

struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *);
void ovs_flow_deferred_free_acts(struct sw_flow_actions *);

int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *,
		     int *key_lenp);
void ovs_flow_used(struct sw_flow *, struct sk_buff *);
u64 ovs_flow_used_time(unsigned long flow_jiffies);

/* Upper bound on the length of a nlattr-formatted flow key.  The longest
 * nlattr-formatted flow key would be:
 *
 *                         struct  pad  nl hdr  total
 *                         ------  ---  ------  -----
 *  OVS_KEY_ATTR_PRIORITY      4    --     4      8
 *  OVS_KEY_ATTR_IN_PORT       4    --     4      8
 *  OVS_KEY_ATTR_ETHERNET     12    --     4     16
 *  OVS_KEY_ATTR_8021Q         4    --     4      8
 *  OVS_KEY_ATTR_ETHERTYPE     2     2     4      8
 *  OVS_KEY_ATTR_IPV6         40    --     4     44
 *  OVS_KEY_ATTR_ICMPV6        2     2     4      8
 *  OVS_KEY_ATTR_ND           28    --     4     32
 *  -------------------------------------------------
 *  total                                       132
 */
#define FLOW_BUFSIZE 132

int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
		      const struct nlattr *);
int ovs_flow_metadata_from_nlattrs(u32 *priority, u16 *in_port,
			       const struct nlattr *);

#define TBL_MIN_BUCKETS		1024

struct flow_table {
	struct flex_array *buckets;
	unsigned int count, n_buckets;
	struct rcu_head rcu;
	int node_ver;
	u32 hash_seed;
	bool keep_flows;
};

static inline int ovs_flow_tbl_count(struct flow_table *table)
{
	return table->count;
}

static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
{
	return (table->count > table->n_buckets);
}

struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
				    struct sw_flow_key *key, int len);
void ovs_flow_tbl_destroy(struct flow_table *table);
void ovs_flow_tbl_deferred_destroy(struct flow_table *table);
struct flow_table *ovs_flow_tbl_alloc(int new_size);
struct flow_table *ovs_flow_tbl_expand(struct flow_table *table);
struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table);
void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow);
void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len);

struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx);
extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];

#endif /* flow.h */
Commit	Line	Data
ccb1352e JG	1	/*
	2	* Copyright (c) 2007-2011 Nicira Networks.
	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
	35	struct sk_buff;
	36
	37	struct sw_flow_actions {
	38	struct rcu_head rcu;
	39	u32 actions_len;
	40	struct nlattr actions[];
	41	};
	42
	43	struct 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
96	struct 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
111	struct 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
125	int ovs_flow_init(void);
126	void ovs_flow_exit(void);
127
128	struct sw_flow *ovs_flow_alloc(void);
129	void ovs_flow_deferred_free(struct sw_flow *);
130	void ovs_flow_free(struct sw_flow *flow);
131
132	struct sw_flow_actions ovs_flow_actions_alloc(const struct nlattr );
133	void ovs_flow_deferred_free_acts(struct sw_flow_actions *);
134
135	int ovs_flow_extract(struct sk_buff , u16 in_port, struct sw_flow_key ,
136	int *key_lenp);
137	void ovs_flow_used(struct sw_flow , struct sk_buff );
138	u64 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_8021Q 4 -- 4 8
149	* OVS_KEY_ATTR_ETHERTYPE 2 2 4 8
150	* OVS_KEY_ATTR_IPV6 40 -- 4 44
151	* OVS_KEY_ATTR_ICMPV6 2 2 4 8
152	* OVS_KEY_ATTR_ND 28 -- 4 32
153	* -------------------------------------------------
154	* total 132
155	*/
156	#define FLOW_BUFSIZE 132
157
158	int ovs_flow_to_nlattrs(const struct sw_flow_key , struct sk_buff );
159	int ovs_flow_from_nlattrs(struct sw_flow_key swkey, int key_lenp,
160	const struct nlattr *);
161	int ovs_flow_metadata_from_nlattrs(u32 priority, u16 in_port,
162	const struct nlattr *);
163
164	#define TBL_MIN_BUCKETS 1024
165
166	struct flow_table {
167	struct flex_array *buckets;
168	unsigned int count, n_buckets;
169	struct rcu_head rcu;
170	int node_ver;
171	u32 hash_seed;
172	bool keep_flows;
173	};
174
175	static inline int ovs_flow_tbl_count(struct flow_table *table)
176	{
177	return table->count;
178	}
179
180	static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table)
181	{
182	return (table->count > table->n_buckets);
183	}
184
185	struct sw_flow ovs_flow_tbl_lookup(struct flow_table table,
186	struct sw_flow_key *key, int len);
187	void ovs_flow_tbl_destroy(struct flow_table *table);
188	void ovs_flow_tbl_deferred_destroy(struct flow_table *table);
189	struct flow_table *ovs_flow_tbl_alloc(int new_size);
190	struct flow_table ovs_flow_tbl_expand(struct flow_table table);
191	struct flow_table ovs_flow_tbl_rehash(struct flow_table table);
192	void ovs_flow_tbl_insert(struct flow_table table, struct sw_flow flow);
193	void ovs_flow_tbl_remove(struct flow_table table, struct sw_flow flow);
194	u32 ovs_flow_hash(const struct sw_flow_key *key, int key_len);
195
196	struct sw_flow ovs_flow_tbl_next(struct flow_table table, u32 bucket, u32 idx);
197	extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1];
198
199	#endif /* flow.h */