1/*
  2 * Copyright (c) 2015 Nicira, Inc.
  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
 14#ifndef OVS_CONNTRACK_H
 15#define OVS_CONNTRACK_H 1
 16
 17#include "flow.h"
 18
 19struct ovs_conntrack_info;
 20enum ovs_key_attr;
 21
 22#if IS_ENABLED(CONFIG_NF_CONNTRACK)
 23void ovs_ct_init(struct net *);
 24void ovs_ct_exit(struct net *);
 25bool ovs_ct_verify(struct net *, enum ovs_key_attr attr);
 26int ovs_ct_copy_action(struct net *, const struct nlattr *,
 27		       const struct sw_flow_key *, struct sw_flow_actions **,
 28		       bool log);
 29int ovs_ct_action_to_attr(const struct ovs_conntrack_info *, struct sk_buff *);
 30
 31int ovs_ct_execute(struct net *, struct sk_buff *, struct sw_flow_key *,
 32		   const struct ovs_conntrack_info *);
 33int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key);
 34
 35void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key);
 36int ovs_ct_put_key(const struct sw_flow_key *swkey,
 37		   const struct sw_flow_key *output, struct sk_buff *skb);
 38void ovs_ct_free_action(const struct nlattr *a);
 39
 40#define CT_SUPPORTED_MASK (OVS_CS_F_NEW | OVS_CS_F_ESTABLISHED | \
 41			   OVS_CS_F_RELATED | OVS_CS_F_REPLY_DIR | \
 42			   OVS_CS_F_INVALID | OVS_CS_F_TRACKED | \
 43			   OVS_CS_F_SRC_NAT | OVS_CS_F_DST_NAT)
 44#else
 45#include <linux/errno.h>
 46
 47static inline void ovs_ct_init(struct net *net) { }
 48
 49static inline void ovs_ct_exit(struct net *net) { }
 50
 51static inline bool ovs_ct_verify(struct net *net, int attr)
 52{
 53	return false;
 54}
 55
 56static inline int ovs_ct_copy_action(struct net *net, const struct nlattr *nla,
 57				     const struct sw_flow_key *key,
 58				     struct sw_flow_actions **acts, bool log)
 59{
 60	return -ENOTSUPP;
 61}
 62
 63static inline int ovs_ct_action_to_attr(const struct ovs_conntrack_info *info,
 64					struct sk_buff *skb)
 65{
 66	return -ENOTSUPP;
 67}
 68
 69static inline int ovs_ct_execute(struct net *net, struct sk_buff *skb,
 70				 struct sw_flow_key *key,
 71				 const struct ovs_conntrack_info *info)
 72{
 73	kfree_skb(skb);
 74	return -ENOTSUPP;
 75}
 76
 77static inline int ovs_ct_clear(struct sk_buff *skb,
 78			       struct sw_flow_key *key)
 79{
 80	return -ENOTSUPP;
 81}
 82
 83static inline void ovs_ct_fill_key(const struct sk_buff *skb,
 84				   struct sw_flow_key *key)
 85{
 86	key->ct_state = 0;
 87	key->ct_zone = 0;
 88	key->ct.mark = 0;
 89	memset(&key->ct.labels, 0, sizeof(key->ct.labels));
 90	/* Clear 'ct_orig_proto' to mark the non-existence of original
 91	 * direction key fields.
 92	 */
 93	key->ct_orig_proto = 0;
 94}
 95
 96static inline int ovs_ct_put_key(const struct sw_flow_key *swkey,
 97				 const struct sw_flow_key *output,
 98				 struct sk_buff *skb)
 99{
100	return 0;
101}
102
103static inline void ovs_ct_free_action(const struct nlattr *a) { }
104
105#define CT_SUPPORTED_MASK 0
106#endif /* CONFIG_NF_CONNTRACK */
107#endif /* ovs_conntrack.h */