net/openvswitch/conntrack.h

   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
  19 struct ovs_conntrack_info;
  20 enum ovs_key_attr;
  21
  22 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
  23 void ovs_ct_init(struct net *);
  24 void ovs_ct_exit(struct net *);
  25 bool ovs_ct_verify(struct net *, enum ovs_key_attr attr);
  26 int ovs_ct_copy_action(struct net *, const struct nlattr *,
  27                        const struct sw_flow_key *, struct sw_flow_actions **,
  28                        bool log);
  29 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *, struct sk_buff *);
  30
  31 int ovs_ct_execute(struct net *, struct sk_buff *, struct sw_flow_key *,
  32                    const struct ovs_conntrack_info *);
  33 int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key);
  34
  35 void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key);
  36 int ovs_ct_put_key(const struct sw_flow_key *swkey,
  37                    const struct sw_flow_key *output, struct sk_buff *skb);
  38 void 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
  47 static inline void ovs_ct_init(struct net *net) { }
  48
  49 static inline void ovs_ct_exit(struct net *net) { }
  50
  51 static inline bool ovs_ct_verify(struct net *net, int attr)
  52 {
  53         return false;
  54 }
  55
  56 static 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
  63 static inline int ovs_ct_action_to_attr(const struct ovs_conntrack_info *info,
  64                                         struct sk_buff *skb)
  65 {
  66         return -ENOTSUPP;
  67 }
  68
  69 static 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
  77 static inline int ovs_ct_clear(struct sk_buff *skb,
  78                                struct sw_flow_key *key)
  79 {
  80         return -ENOTSUPP;
  81 }
  82
  83 static 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
  96 static 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
 103 static 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 */