285 lines
8.2 KiB
C
285 lines
8.2 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, tp_dst) + \
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FIELD_SIZEOF(struct ovs_key_ipv4_tunnel, tp_dst))
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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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__be16 tp_src;
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__be16 tp_dst;
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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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const void *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 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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static inline void __ovs_flow_tun_info_init(struct ovs_tunnel_info *tun_info,
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__be32 saddr, __be32 daddr,
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u8 tos, u8 ttl,
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__be16 tp_src,
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__be16 tp_dst,
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__be64 tun_id,
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__be16 tun_flags,
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const void *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 = saddr;
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tun_info->tunnel.ipv4_dst = daddr;
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tun_info->tunnel.ipv4_tos = tos;
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tun_info->tunnel.ipv4_ttl = ttl;
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tun_info->tunnel.tun_flags = tun_flags;
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/* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
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* the upper tunnel are used.
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* E.g: GRE over IPSEC, the tp_src and tp_port are zero.
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*/
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tun_info->tunnel.tp_src = tp_src;
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tun_info->tunnel.tp_dst = tp_dst;
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/* Clear struct padding. */
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if (sizeof(tun_info->tunnel) != OVS_TUNNEL_KEY_SIZE)
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memset((unsigned char *)&tun_info->tunnel + OVS_TUNNEL_KEY_SIZE,
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0, 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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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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__be16 tp_src,
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__be16 tp_dst,
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__be64 tun_id,
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__be16 tun_flags,
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const void *opts,
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u8 opts_len)
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{
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__ovs_flow_tun_info_init(tun_info, iph->saddr, iph->daddr,
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iph->tos, iph->ttl,
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tp_src, tp_dst,
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tun_id, tun_flags,
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opts, opts_len);
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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[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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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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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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#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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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; /* 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_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 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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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 ovs_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(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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