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 struct ovs_ct_limit_info;
  22 enum ovs_key_attr;
  23
  24 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
  25 int ovs_ct_init(struct net *);
  26 void ovs_ct_exit(struct net *);
  27 bool ovs_ct_verify(struct net *, enum ovs_key_attr attr);
  28 int ovs_ct_copy_action(struct net *, const struct nlattr *,
  29                        const struct sw_flow_key *, struct sw_flow_actions **,
  30                        bool log);
  31 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *, struct sk_buff *);
  32
  33 int ovs_ct_execute(struct net *, struct sk_buff *, struct sw_flow_key *,
  34                    const struct ovs_conntrack_info *);
  35 int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key);
  36
  37 void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key);
  38 int ovs_ct_put_key(const struct sw_flow_key *swkey,
  39                    const struct sw_flow_key *output, struct sk_buff *skb);
  40 void ovs_ct_free_action(const struct nlattr *a);
  41
  42 #define CT_SUPPORTED_MASK (OVS_CS_F_NEW | OVS_CS_F_ESTABLISHED | \
  43                            OVS_CS_F_RELATED | OVS_CS_F_REPLY_DIR | \
  44                            OVS_CS_F_INVALID | OVS_CS_F_TRACKED | \
  45                            OVS_CS_F_SRC_NAT | OVS_CS_F_DST_NAT)
  46 #else
  47 #include <linux/errno.h>
  48
  49 static inline int ovs_ct_init(struct net *net) { return 0; }
  50
  51 static inline void ovs_ct_exit(struct net *net) { }
  52
  53 static inline bool ovs_ct_verify(struct net *net, int attr)
  54 {
  55         return false;
  56 }
  57
  58 static inline int ovs_ct_copy_action(struct net *net, const struct nlattr *nla,
  59                                      const struct sw_flow_key *key,
  60                                      struct sw_flow_actions **acts, bool log)
  61 {
  62         return -ENOTSUPP;
  63 }
  64
  65 static inline int ovs_ct_action_to_attr(const struct ovs_conntrack_info *info,
  66                                         struct sk_buff *skb)
  67 {
  68         return -ENOTSUPP;
  69 }
  70
  71 static inline int ovs_ct_execute(struct net *net, struct sk_buff *skb,
  72                                  struct sw_flow_key *key,
  73                                  const struct ovs_conntrack_info *info)
  74 {
  75         kfree_skb(skb);
  76         return -ENOTSUPP;
  77 }
  78
  79 static inline int ovs_ct_clear(struct sk_buff *skb,
  80                                struct sw_flow_key *key)
  81 {
  82         return -ENOTSUPP;
  83 }
  84
  85 static inline void ovs_ct_fill_key(const struct sk_buff *skb,
  86                                    struct sw_flow_key *key)
  87 {
  88         key->ct_state = 0;
  89         key->ct_zone = 0;
  90         key->ct.mark = 0;
  91         memset(&key->ct.labels, 0, sizeof(key->ct.labels));
  92         /* Clear 'ct_orig_proto' to mark the non-existence of original
  93          * direction key fields.
  94          */
  95         key->ct_orig_proto = 0;
  96 }
  97
  98 static inline int ovs_ct_put_key(const struct sw_flow_key *swkey,
  99                                  const struct sw_flow_key *output,
 100                                  struct sk_buff *skb)
 101 {
 102         return 0;
 103 }
 104
 105 static inline void ovs_ct_free_action(const struct nlattr *a) { }
 106
 107 #define CT_SUPPORTED_MASK 0
 108 #endif
 109
 110 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
 111 extern struct genl_family dp_ct_limit_genl_family;
 112 #endif
 113 #endif /* ovs_conntrack.h */