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