/* * 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 #include #include #include #include #include #include #include #include #include #include #include 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 */