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