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The Openvswitch implementation is completely agnostic to the options that are in use and can handle newly defined options without further work. It does this by simply matching on a byte array of options and allowing userspace to setup flows on this array. Signed-off-by: Jesse Gross <jesse@nicira.com> Singed-off-by: Ansis Atteka <aatteka@nicira.com> Signed-off-by: Andy Zhou <azhou@nicira.com> Acked-by: Thomas Graf <tgraf@noironetworks.com> Acked-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
223 lines
6.8 KiB
C
223 lines
6.8 KiB
C
/*
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* Copyright (c) 2007-2014 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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struct sk_buff;
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/* Used to memset ovs_key_ipv4_tunnel padding. */
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#define OVS_TUNNEL_KEY_SIZE \
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(offsetof(struct ovs_key_ipv4_tunnel, ipv4_ttl) + \
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FIELD_SIZEOF(struct ovs_key_ipv4_tunnel, ipv4_ttl))
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struct ovs_key_ipv4_tunnel {
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__be64 tun_id;
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__be32 ipv4_src;
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__be32 ipv4_dst;
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__be16 tun_flags;
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u8 ipv4_tos;
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u8 ipv4_ttl;
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} __packed __aligned(4); /* Minimize padding. */
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struct ovs_tunnel_info {
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struct ovs_key_ipv4_tunnel tunnel;
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struct geneve_opt *options;
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u8 options_len;
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};
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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 GENEVE_OPTS(flow_key, opt_len) \
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((struct geneve_opt *)((flow_key)->tun_opts + \
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FIELD_SIZEOF(struct sw_flow_key, tun_opts) - \
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opt_len))
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static inline void ovs_flow_tun_info_init(struct ovs_tunnel_info *tun_info,
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const struct iphdr *iph,
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__be64 tun_id, __be16 tun_flags,
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struct geneve_opt *opts,
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u8 opts_len)
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{
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tun_info->tunnel.tun_id = tun_id;
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tun_info->tunnel.ipv4_src = iph->saddr;
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tun_info->tunnel.ipv4_dst = iph->daddr;
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tun_info->tunnel.ipv4_tos = iph->tos;
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tun_info->tunnel.ipv4_ttl = iph->ttl;
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tun_info->tunnel.tun_flags = tun_flags;
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/* clear struct padding. */
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memset((unsigned char *)&tun_info->tunnel + OVS_TUNNEL_KEY_SIZE, 0,
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sizeof(tun_info->tunnel) - OVS_TUNNEL_KEY_SIZE);
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tun_info->options = opts;
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tun_info->options_len = opts_len;
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}
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struct sw_flow_key {
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u8 tun_opts[255];
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u8 tun_opts_len;
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struct ovs_key_ipv4_tunnel 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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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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__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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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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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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} 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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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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} __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
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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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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 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 hlist_node hash_node[2];
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u32 hash;
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int stats_last_writer; /* NUMA-node 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_key unmasked_key;
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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 NUMA node. 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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void ovs_flow_stats_update(struct sw_flow *, __be16 tcp_flags,
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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(struct ovs_tunnel_info *tun_info, 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(const struct nlattr *attr,
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struct sk_buff *skb,
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struct sw_flow_key *key);
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#endif /* flow.h */
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