Add special Twice-NAT feature (VPP-1221)

[vpp.git] / src / plugins / nat / nat.h

diff --git a/src/plugins/nat/nat.h b/src/plugins/nat/nat.h
index bf975a1..775376f 100644 (file)
--- a/src/plugins/nat/nat.h
+++ b/src/plugins/nat/nat.h
@@ -125,10 +125,12 @@ typedef enum {
 } snat_session_state_t;
 
 
-#define SNAT_SESSION_FLAG_STATIC_MAPPING 1
-#define SNAT_SESSION_FLAG_UNKNOWN_PROTO  2
-#define SNAT_SESSION_FLAG_LOAD_BALANCING 4
-#define SNAT_SESSION_FLAG_TWICE_NAT      8
+#define SNAT_SESSION_FLAG_STATIC_MAPPING       1
+#define SNAT_SESSION_FLAG_UNKNOWN_PROTO        2
+#define SNAT_SESSION_FLAG_LOAD_BALANCING       4
+#define SNAT_SESSION_FLAG_TWICE_NAT            8
+#define SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT   16
+#define SNAT_SESSION_FLAG_FWD_BYPASS           32
 
 #define NAT_INTERFACE_FLAG_IS_INSIDE 1
 #define NAT_INTERFACE_FLAG_IS_OUTSIDE 2
@@ -210,18 +212,25 @@ typedef struct {
   u8 prefix;
 } nat44_lb_addr_port_t;
 
+typedef enum {
+  TWICE_NAT_DISABLED,
+  TWICE_NAT,
+  TWICE_NAT_SELF,
+} twice_nat_type_t;
+
 typedef struct {
   ip4_address_t local_addr;
   ip4_address_t external_addr;
   u16 local_port;
   u16 external_port;
   u8 addr_only;
-  u8 twice_nat;
+  twice_nat_type_t twice_nat;
   u8 out2in_only;
   u32 vrf_id;
   u32 fib_index;
   snat_protocol_t proto;
   u32 worker_index;
+  u8 *tag;
   nat44_lb_addr_port_t *locals;
 } snat_static_mapping_t;
 
@@ -240,6 +249,7 @@ typedef struct {
   int addr_only;
   int twice_nat;
   int is_add;
+  u8 *tag;
 } snat_static_map_resolve_t;
 
 typedef struct {
@@ -419,7 +429,8 @@ int snat_static_mapping_match (snat_main_t * sm,
                                snat_session_key_t * mapping,
                                u8 by_external,
                                u8 *is_addr_only,
-                               u8 *twice_nat);
+                               twice_nat_type_t *twice_nat,
+                               u8 *lb);
 
 void snat_add_del_addr_to_fib (ip4_address_t * addr,
                                u8 p_len,
@@ -460,11 +471,17 @@ typedef struct {
 */
 #define is_lb_session(s) (s->flags & SNAT_SESSION_FLAG_LOAD_BALANCING)
 
+/** \brief Check if NAT session is forwarding bypass.
+    @param s NAT session
+    @return 1 if NAT session is load-balancing
+*/
+#define is_fwd_bypass_session(s) (s->flags & SNAT_SESSION_FLAG_FWD_BYPASS)
+
 /** \brief Check if NAT session is endpoint dependent.
     @param s NAT session
     @return 1 if NAT session is endpoint dependent
 */
-#define is_ed_session(s) (snat_is_unk_proto_session (s) || is_twice_nat_session (s) || is_lb_session (s))
+#define is_ed_session(s) (s->flags & SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT)
 
 #define nat_interface_is_inside(i) i->flags & NAT_INTERFACE_FLAG_IS_INSIDE
 #define nat_interface_is_outside(i) i->flags & NAT_INTERFACE_FLAG_IS_OUTSIDE
@@ -548,7 +565,8 @@ void nat44_add_del_address_dpo (ip4_address_t addr, u8 is_add);
 int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
                             u16 l_port, u16 e_port, u32 vrf_id, int addr_only,
                             u32 sw_if_index, snat_protocol_t proto, int is_add,
-                            u8 twice_nat, u8 out2in_only);
+                            twice_nat_type_t twice_nat, u8 out2in_only,
+                            u8 *tag);
 clib_error_t * snat_api_init(vlib_main_t * vm, snat_main_t * sm);
 int snat_set_workers (uword * bitmap);
 int snat_interface_add_del(u32 sw_if_index, u8 is_inside, int is_del);
@@ -561,7 +579,8 @@ u8 * format_snat_protocol(u8 * s, va_list * args);
 int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
                                      snat_protocol_t proto, u32 vrf_id,
                                      nat44_lb_addr_port_t *locals, u8 is_add,
-                                     u8 twice_nat, u8 out2in_only);
+                                     twice_nat_type_t twice_nat, u8 out2in_only,
+                                     u8 *tag);
 int nat44_del_session (snat_main_t *sm, ip4_address_t *addr, u16 port,
                        snat_protocol_t proto, u32 vrf_id, int is_in);
 void nat_free_session_data (snat_main_t * sm, snat_session_t * s,
@@ -650,4 +669,16 @@ nat_send_all_to_node(vlib_main_t *vm, u32 *bi_vector,
   }
 }
 
+always_inline void
+user_session_increment(snat_main_t *sm, snat_user_t *u, u8 is_static)
+{
+  if (u->nsessions + u->nstaticsessions < sm->max_translations_per_user)
+    {
+      if (is_static)
+       u->nstaticsessions++;
+      else
+       u->nsessions++;
+    }
+}
+
 #endif /* __included_snat_h__ */