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/nf_conntrack_tuple_common.h>
  10 #include <net/dst.h>
  11
  12 struct nf_flowtable;
  13
  14 struct nf_flowtable_type {
  15         struct list_head                list;
  16         int                             family;
  17         int                             (*init)(struct nf_flowtable *ft);
  18         void                            (*free)(struct nf_flowtable *ft);
  19         nf_hookfn                       *hook;
  20         struct module                   *owner;
  21 };
  22
  23 struct nf_flowtable {
  24         struct list_head                list;
  25         struct rhashtable               rhashtable;
  26         const struct nf_flowtable_type  *type;
  27         struct delayed_work             gc_work;
  28 };
  29
  30 enum flow_offload_tuple_dir {
  31         FLOW_OFFLOAD_DIR_ORIGINAL = IP_CT_DIR_ORIGINAL,
  32         FLOW_OFFLOAD_DIR_REPLY = IP_CT_DIR_REPLY,
  33         FLOW_OFFLOAD_DIR_MAX = IP_CT_DIR_MAX
  34 };
  35
  36 struct flow_offload_tuple {
  37         union {
  38                 struct in_addr          src_v4;
  39                 struct in6_addr         src_v6;
  40         };
  41         union {
  42                 struct in_addr          dst_v4;
  43                 struct in6_addr         dst_v6;
  44         };
  45         struct {
  46                 __be16                  src_port;
  47                 __be16                  dst_port;
  48         };
  49
  50         int                             iifidx;
  51
  52         u8                              l3proto;
  53         u8                              l4proto;
  54         u8                              dir;
  55
  56         u16                             mtu;
  57
  58         struct dst_entry                *dst_cache;
  59 };
  60
  61 struct flow_offload_tuple_rhash {
  62         struct rhash_head               node;
  63         struct flow_offload_tuple       tuple;
  64 };
  65
  66 #define FLOW_OFFLOAD_SNAT       0x1
  67 #define FLOW_OFFLOAD_DNAT       0x2
  68 #define FLOW_OFFLOAD_DYING      0x4
  69 #define FLOW_OFFLOAD_TEARDOWN   0x8
  70
  71 struct flow_offload {
  72         struct flow_offload_tuple_rhash         tuplehash[FLOW_OFFLOAD_DIR_MAX];
  73         u32                                     flags;
  74         union {
  75                 /* Your private driver data here. */
  76                 u32             timeout;
  77         };
  78 };
  79
  80 #define NF_FLOW_TIMEOUT (30 * HZ)
  81
  82 struct nf_flow_route {
  83         struct {
  84                 struct dst_entry        *dst;
  85         } tuple[FLOW_OFFLOAD_DIR_MAX];
  86 };
  87
  88 struct flow_offload *flow_offload_alloc(struct nf_conn *ct,
  89                                         struct nf_flow_route *route);
  90 void flow_offload_free(struct flow_offload *flow);
  91
  92 int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow);
  93 struct flow_offload_tuple_rhash *flow_offload_lookup(struct nf_flowtable *flow_table,
  94                                                      struct flow_offload_tuple *tuple);
  95 void nf_flow_table_cleanup(struct net_device *dev);
  96
  97 int nf_flow_table_init(struct nf_flowtable *flow_table);
  98 void nf_flow_table_free(struct nf_flowtable *flow_table);
  99
 100 void flow_offload_teardown(struct flow_offload *flow);
 101 static inline void flow_offload_dead(struct flow_offload *flow)
 102 {
 103         flow->flags |= FLOW_OFFLOAD_DYING;
 104 }
 105
 106 int nf_flow_snat_port(const struct flow_offload *flow,
 107                       struct sk_buff *skb, unsigned int thoff,
 108                       u8 protocol, enum flow_offload_tuple_dir dir);
 109 int nf_flow_dnat_port(const struct flow_offload *flow,
 110                       struct sk_buff *skb, unsigned int thoff,
 111                       u8 protocol, enum flow_offload_tuple_dir dir);
 112
 113 struct flow_ports {
 114         __be16 source, dest;
 115 };
 116
 117 unsigned int nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
 118                                      const struct nf_hook_state *state);
 119 unsigned int nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
 120                                        const struct nf_hook_state *state);
 121
 122 #define MODULE_ALIAS_NF_FLOWTABLE(family)       \
 123         MODULE_ALIAS("nf-flowtable-" __stringify(family))
 124
 125 #endif /* _FLOW_OFFLOAD_H */