include/net/netfilter/nf_flow_table.h

   1 #ifndef _NF_FLOW_TABLE_H
   2 #define _NF_FLOW_TABLE_H
   3
   4 #include <linux/in.h>
   5 #include <linux/in6.h>
   6 #include <linux/netdevice.h>
   7 #include <linux/rhashtable-types.h>
   8 #include <linux/rcupdate.h>
   9 #include <linux/netfilter.h>
  10 #include <linux/netfilter/nf_conntrack_tuple_common.h>
  11 #include <net/flow_offload.h>
  12 #include <net/dst.h>
  13
  14 struct nf_flowtable;
  15 struct nf_flow_rule;
  16 struct flow_offload;
  17 enum flow_offload_tuple_dir;
  18
  19 struct nf_flowtable_type {
  20         struct list_head                list;
  21         int                             family;
  22         int                             (*init)(struct nf_flowtable *ft);
  23         int                             (*setup)(struct nf_flowtable *ft,
  24                                                  struct net_device *dev,
  25                                                  enum flow_block_command cmd);
  26         int                             (*action)(struct net *net,
  27                                                   const struct flow_offload *flow,
  28                                                   enum flow_offload_tuple_dir dir,
  29                                                   struct nf_flow_rule *flow_rule);
  30         void                            (*free)(struct nf_flowtable *ft);
  31         nf_hookfn                       *hook;
  32         struct module                   *owner;
  33 };
  34
  35 enum nf_flowtable_flags {
  36         NF_FLOWTABLE_HW_OFFLOAD         = 0x1,
  37 };
  38
  39 struct nf_flowtable {
  40         struct list_head                list;
  41         struct rhashtable               rhashtable;
  42         int                             priority;
  43         const struct nf_flowtable_type  *type;
  44         struct delayed_work             gc_work;
  45         unsigned int                    flags;
  46         struct flow_block               flow_block;
  47         possible_net_t                  net;
  48 };
  49
  50 enum flow_offload_tuple_dir {
  51         FLOW_OFFLOAD_DIR_ORIGINAL = IP_CT_DIR_ORIGINAL,
  52         FLOW_OFFLOAD_DIR_REPLY = IP_CT_DIR_REPLY,
  53         FLOW_OFFLOAD_DIR_MAX = IP_CT_DIR_MAX
  54 };
  55
  56 struct flow_offload_tuple {
  57         union {
  58                 struct in_addr          src_v4;
  59                 struct in6_addr         src_v6;
  60         };
  61         union {
  62                 struct in_addr          dst_v4;
  63                 struct in6_addr         dst_v6;
  64         };
  65         struct {
  66                 __be16                  src_port;
  67                 __be16                  dst_port;
  68         };
  69
  70         int                             iifidx;
  71
  72         u8                              l3proto;
  73         u8                              l4proto;
  74         u8                              dir;
  75
  76         u16                             mtu;
  77
  78         struct dst_entry                *dst_cache;
  79 };
  80
  81 struct flow_offload_tuple_rhash {
  82         struct rhash_head               node;
  83         struct flow_offload_tuple       tuple;
  84 };
  85
  86 #define FLOW_OFFLOAD_SNAT       0x1
  87 #define FLOW_OFFLOAD_DNAT       0x2
  88 #define FLOW_OFFLOAD_DYING      0x4
  89 #define FLOW_OFFLOAD_TEARDOWN   0x8
  90 #define FLOW_OFFLOAD_HW         0x10
  91 #define FLOW_OFFLOAD_HW_DYING   0x20
  92 #define FLOW_OFFLOAD_HW_DEAD    0x40
  93
  94 enum flow_offload_type {
  95         NF_FLOW_OFFLOAD_UNSPEC  = 0,
  96         NF_FLOW_OFFLOAD_ROUTE,
  97 };
  98
  99 struct flow_offload {
 100         struct flow_offload_tuple_rhash         tuplehash[FLOW_OFFLOAD_DIR_MAX];
 101         struct nf_conn                          *ct;
 102         u16                                     flags;
 103         u16                                     type;
 104         u32                                     timeout;
 105         struct rcu_head                         rcu_head;
 106 };
 107
 108 #define NF_FLOW_TIMEOUT (30 * HZ)
 109
 110 struct nf_flow_route {
 111         struct {
 112                 struct dst_entry        *dst;
 113         } tuple[FLOW_OFFLOAD_DIR_MAX];
 114 };
 115
 116 struct flow_offload *flow_offload_alloc(struct nf_conn *ct);
 117 void flow_offload_free(struct flow_offload *flow);
 118
 119 int flow_offload_route_init(struct flow_offload *flow,
 120                             const struct nf_flow_route *route);
 121
 122 int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow);
 123 struct flow_offload_tuple_rhash *flow_offload_lookup(struct nf_flowtable *flow_table,
 124                                                      struct flow_offload_tuple *tuple);
 125 void nf_flow_table_cleanup(struct net_device *dev);
 126
 127 int nf_flow_table_init(struct nf_flowtable *flow_table);
 128 void nf_flow_table_free(struct nf_flowtable *flow_table);
 129
 130 void flow_offload_teardown(struct flow_offload *flow);
 131 static inline void flow_offload_dead(struct flow_offload *flow)
 132 {
 133         flow->flags |= FLOW_OFFLOAD_DYING;
 134 }
 135
 136 int nf_flow_snat_port(const struct flow_offload *flow,
 137                       struct sk_buff *skb, unsigned int thoff,
 138                       u8 protocol, enum flow_offload_tuple_dir dir);
 139 int nf_flow_dnat_port(const struct flow_offload *flow,
 140                       struct sk_buff *skb, unsigned int thoff,
 141                       u8 protocol, enum flow_offload_tuple_dir dir);
 142
 143 struct flow_ports {
 144         __be16 source, dest;
 145 };
 146
 147 unsigned int nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
 148                                      const struct nf_hook_state *state);
 149 unsigned int nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
 150                                        const struct nf_hook_state *state);
 151
 152 #define MODULE_ALIAS_NF_FLOWTABLE(family)       \
 153         MODULE_ALIAS("nf-flowtable-" __stringify(family))
 154
 155 void nf_flow_offload_add(struct nf_flowtable *flowtable,
 156                          struct flow_offload *flow);
 157 void nf_flow_offload_del(struct nf_flowtable *flowtable,
 158                          struct flow_offload *flow);
 159 void nf_flow_offload_stats(struct nf_flowtable *flowtable,
 160                            struct flow_offload *flow);
 161
 162 void nf_flow_table_offload_flush(struct nf_flowtable *flowtable);
 163 int nf_flow_table_offload_setup(struct nf_flowtable *flowtable,
 164                                 struct net_device *dev,
 165                                 enum flow_block_command cmd);
 166 int nf_flow_rule_route_ipv4(struct net *net, const struct flow_offload *flow,
 167                             enum flow_offload_tuple_dir dir,
 168                             struct nf_flow_rule *flow_rule);
 169 int nf_flow_rule_route_ipv6(struct net *net, const struct flow_offload *flow,
 170                             enum flow_offload_tuple_dir dir,
 171                             struct nf_flow_rule *flow_rule);
 172
 173 int nf_flow_table_offload_init(void);
 174 void nf_flow_table_offload_exit(void);
 175
 176 #endif /* _NF_FLOW_TABLE_H */