LXR linux/include/net/netfilter/nf_flow

   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.h>
   8#include <linux/rcupdate.h>
   9#include <net/dst.h>
  10
  11struct nf_flowtable;
  12
  13struct nf_flowtable_type {
  14        struct list_head                list;
  15        int                             family;
  16        void                            (*gc)(struct work_struct *work);
  17        void                            (*free)(struct nf_flowtable *ft);
  18        const struct rhashtable_params  *params;
  19        nf_hookfn                       *hook;
  20        struct module                   *owner;
  21};
  22
  23struct nf_flowtable {
  24        struct rhashtable               rhashtable;
  25        const struct nf_flowtable_type  *type;
  26        struct delayed_work             gc_work;
  27};
  28
  29enum flow_offload_tuple_dir {
  30        FLOW_OFFLOAD_DIR_ORIGINAL,
  31        FLOW_OFFLOAD_DIR_REPLY,
  32        __FLOW_OFFLOAD_DIR_MAX          = FLOW_OFFLOAD_DIR_REPLY,
  33};
  34#define FLOW_OFFLOAD_DIR_MAX    (__FLOW_OFFLOAD_DIR_MAX + 1)
  35
  36struct 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        int                             oifidx;
  57
  58        struct dst_entry                *dst_cache;
  59};
  60
  61struct 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
  70struct flow_offload {
  71        struct flow_offload_tuple_rhash         tuplehash[FLOW_OFFLOAD_DIR_MAX];
  72        u32                                     flags;
  73        union {
  74                /* Your private driver data here. */
  75                u32             timeout;
  76        };
  77};
  78
  79#define NF_FLOW_TIMEOUT (30 * HZ)
  80
  81struct nf_flow_route {
  82        struct {
  83                struct dst_entry        *dst;
  84                int                     ifindex;
  85        } tuple[FLOW_OFFLOAD_DIR_MAX];
  86};
  87
  88struct flow_offload *flow_offload_alloc(struct nf_conn *ct,
  89                                        struct nf_flow_route *route);
  90void flow_offload_free(struct flow_offload *flow);
  91
  92int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow);
  93struct flow_offload_tuple_rhash *flow_offload_lookup(struct nf_flowtable *flow_table,
  94                                                     struct flow_offload_tuple *tuple);
  95int nf_flow_table_iterate(struct nf_flowtable *flow_table,
  96                          void (*iter)(struct flow_offload *flow, void *data),
  97                          void *data);
  98
  99void nf_flow_table_cleanup(struct net *net, struct net_device *dev);
 100
 101void nf_flow_table_free(struct nf_flowtable *flow_table);
 102void nf_flow_offload_work_gc(struct work_struct *work);
 103extern const struct rhashtable_params nf_flow_offload_rhash_params;
 104
 105void flow_offload_dead(struct flow_offload *flow);
 106
 107int nf_flow_snat_port(const struct flow_offload *flow,
 108                      struct sk_buff *skb, unsigned int thoff,
 109                      u8 protocol, enum flow_offload_tuple_dir dir);
 110int nf_flow_dnat_port(const struct flow_offload *flow,
 111                      struct sk_buff *skb, unsigned int thoff,
 112                      u8 protocol, enum flow_offload_tuple_dir dir);
 113
 114struct flow_ports {
 115        __be16 source, dest;
 116};
 117
 118unsigned int nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
 119                                     const struct nf_hook_state *state);
 120unsigned int nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
 121                                       const struct nf_hook_state *state);
 122
 123#define MODULE_ALIAS_NF_FLOWTABLE(family)       \
 124        MODULE_ALIAS("nf-flowtable-" __stringify(family))
 125
 126#endif /* _FLOW_OFFLOAD_H */
 127