287 lines
8.1 KiB
C
287 lines
8.1 KiB
C
/*
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* Copyright (c) 2007-2017 Nicira, Inc.
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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/cache.h>
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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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#include <net/ip_tunnels.h>
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#include <net/dst_metadata.h>
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struct sk_buff;
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enum sw_flow_mac_proto {
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MAC_PROTO_NONE = 0,
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MAC_PROTO_ETHERNET,
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};
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#define SW_FLOW_KEY_INVALID 0x80
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/* Store options at the end of the array if they are less than the
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* maximum size. This allows us to get the benefits of variable length
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* matching for small options.
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*/
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#define TUN_METADATA_OFFSET(opt_len) \
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(FIELD_SIZEOF(struct sw_flow_key, tun_opts) - opt_len)
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#define TUN_METADATA_OPTS(flow_key, opt_len) \
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((void *)((flow_key)->tun_opts + TUN_METADATA_OFFSET(opt_len)))
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struct ovs_tunnel_info {
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struct metadata_dst *tun_dst;
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};
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struct vlan_head {
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__be16 tpid; /* Vlan type. Generally 802.1q or 802.1ad.*/
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__be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
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};
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#define OVS_SW_FLOW_KEY_METADATA_SIZE \
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(offsetof(struct sw_flow_key, recirc_id) + \
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FIELD_SIZEOF(struct sw_flow_key, recirc_id))
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struct sw_flow_key {
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u8 tun_opts[IP_TUNNEL_OPTS_MAX];
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u8 tun_opts_len;
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struct ip_tunnel_key tun_key; /* Encapsulating tunnel key. */
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struct {
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u32 priority; /* Packet QoS priority. */
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u32 skb_mark; /* SKB mark. */
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u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
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} __packed phy; /* Safe when right after 'tun_key'. */
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u8 mac_proto; /* MAC layer protocol (e.g. Ethernet). */
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u8 tun_proto; /* Protocol of encapsulating tunnel. */
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u32 ovs_flow_hash; /* Datapath computed hash value. */
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u32 recirc_id; /* Recirculation ID. */
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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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struct vlan_head vlan;
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struct vlan_head cvlan;
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__be16 type; /* Ethernet frame type. */
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} eth;
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/* Filling a hole of two bytes. */
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u8 ct_state;
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u8 ct_orig_proto; /* CT original direction tuple IP
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* protocol.
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*/
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union {
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struct {
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__be32 top_lse; /* top label stack entry */
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} mpls;
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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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};
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u16 ct_zone; /* Conntrack zone. */
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struct {
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__be16 src; /* TCP/UDP/SCTP source port. */
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__be16 dst; /* TCP/UDP/SCTP destination port. */
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__be16 flags; /* TCP flags. */
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} tp;
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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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__be32 src;
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__be32 dst;
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} ct_orig; /* Conntrack original direction fields. */
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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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union {
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struct {
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struct in6_addr src;
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struct in6_addr dst;
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} ct_orig; /* Conntrack original direction fields. */
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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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};
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} ipv6;
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};
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struct {
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/* Connection tracking fields not packed above. */
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struct {
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__be16 src; /* CT orig tuple tp src port. */
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__be16 dst; /* CT orig tuple tp dst port. */
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} orig_tp;
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u32 mark;
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struct ovs_key_ct_labels labels;
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} ct;
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} __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
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static inline bool sw_flow_key_is_nd(const struct sw_flow_key *key)
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{
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return key->eth.type == htons(ETH_P_IPV6) &&
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key->ip.proto == NEXTHDR_ICMP &&
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key->tp.dst == 0 &&
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(key->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
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key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT));
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}
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struct sw_flow_key_range {
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unsigned short int start;
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unsigned short int end;
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};
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struct sw_flow_mask {
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int ref_count;
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struct rcu_head rcu;
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struct list_head list;
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struct sw_flow_key_range range;
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struct sw_flow_key key;
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};
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struct sw_flow_match {
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struct sw_flow_key *key;
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struct sw_flow_key_range range;
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struct sw_flow_mask *mask;
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};
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#define MAX_UFID_LENGTH 16 /* 128 bits */
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struct sw_flow_id {
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u32 ufid_len;
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union {
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u32 ufid[MAX_UFID_LENGTH / 4];
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struct sw_flow_key *unmasked_key;
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};
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};
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struct sw_flow_actions {
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struct rcu_head rcu;
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size_t orig_len; /* From flow_cmd_new netlink actions size */
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u32 actions_len;
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struct nlattr actions[];
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};
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struct flow_stats {
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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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unsigned long used; /* Last used time (in jiffies). */
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spinlock_t lock; /* Lock for atomic stats update. */
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__be16 tcp_flags; /* Union of seen TCP flags. */
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};
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struct sw_flow {
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struct rcu_head rcu;
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struct {
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struct hlist_node node[2];
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u32 hash;
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} flow_table, ufid_table;
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int stats_last_writer; /* CPU id of the last writer on
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* 'stats[0]'.
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*/
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struct sw_flow_key key;
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struct sw_flow_id id;
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struct sw_flow_mask *mask;
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struct sw_flow_actions __rcu *sf_acts;
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struct flow_stats __rcu *stats[]; /* One for each CPU. First one
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* is allocated at flow creation time,
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* the rest are allocated on demand
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* while holding the 'stats[0].lock'.
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*/
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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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static inline u8 ovs_key_mac_proto(const struct sw_flow_key *key)
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{
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return key->mac_proto & ~SW_FLOW_KEY_INVALID;
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}
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static inline u16 __ovs_mac_header_len(u8 mac_proto)
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{
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return mac_proto == MAC_PROTO_ETHERNET ? ETH_HLEN : 0;
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}
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static inline u16 ovs_mac_header_len(const struct sw_flow_key *key)
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{
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return __ovs_mac_header_len(ovs_key_mac_proto(key));
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}
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static inline bool ovs_identifier_is_ufid(const struct sw_flow_id *sfid)
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{
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return sfid->ufid_len;
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}
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static inline bool ovs_identifier_is_key(const struct sw_flow_id *sfid)
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{
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return !ovs_identifier_is_ufid(sfid);
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}
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void ovs_flow_stats_update(struct sw_flow *, __be16 tcp_flags,
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const struct sk_buff *);
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void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
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unsigned long *used, __be16 *tcp_flags);
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void ovs_flow_stats_clear(struct sw_flow *);
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u64 ovs_flow_used_time(unsigned long flow_jiffies);
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int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key);
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int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
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struct sk_buff *skb,
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struct sw_flow_key *key);
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/* Extract key from packet coming from userspace. */
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int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
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struct sk_buff *skb,
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struct sw_flow_key *key, bool log);
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#endif /* flow.h */
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