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nat64_db.c File Reference

NAT64 DB. More...

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Functions

int nat64_db_init (nat64_db_t *db, u32 bib_buckets, u32 bib_memory_size, u32 st_buckets, u32 st_memory_size, nat64_db_free_addr_port_function_t free_addr_port_cb)
 Initialize NAT64 DB. More...
 
nat64_db_bib_entry_t * nat64_db_bib_entry_create (nat64_db_t *db, ip6_address_t *in_addr, ip4_address_t *out_addr, u16 in_port, u16 out_port, u32 fib_index, u8 proto, u8 is_static)
 Create new NAT64 BIB entry. More...
 
void nat64_db_bib_entry_free (nat64_db_t *db, nat64_db_bib_entry_t *bibe)
 Free NAT64 BIB entry. More...
 
nat64_db_bib_entry_t * nat64_db_bib_entry_find (nat64_db_t *db, ip46_address_t *addr, u16 port, u8 proto, u32 fib_index, u8 is_ip6)
 Find NAT64 BIB entry. More...
 
void nat64_db_bib_walk (nat64_db_t *db, u8 proto, nat64_db_bib_walk_fn_t fn, void *ctx)
 Walk NAT64 BIB. More...
 
nat64_db_bib_entry_t * nat64_db_bib_entry_by_index (nat64_db_t *db, u8 proto, u32 bibe_index)
 Get BIB entry by index and protocol. More...
 
void nat64_db_st_walk (nat64_db_t *db, u8 proto, nat64_db_st_walk_fn_t fn, void *ctx)
 Walk NAT64 session table. More...
 
nat64_db_st_entry_t * nat64_db_st_entry_create (nat64_db_t *db, nat64_db_bib_entry_t *bibe, ip6_address_t *in_r_addr, ip4_address_t *out_r_addr, u16 r_port)
 Create new NAT64 session table entry. More...
 
void nat64_db_st_entry_free (nat64_db_t *db, nat64_db_st_entry_t *ste)
 Free NAT64 session table entry. More...
 
nat64_db_st_entry_t * nat64_db_st_entry_find (nat64_db_t *db, ip46_address_t *l_addr, ip46_address_t *r_addr, u16 l_port, u16 r_port, u8 proto, u32 fib_index, u8 is_ip6)
 Find NAT64 session table entry. More...
 
u32 nat64_db_st_entry_get_index (nat64_db_t *db, nat64_db_st_entry_t *ste)
 
nat64_db_st_entry_t * nat64_db_st_entry_by_index (nat64_db_t *db, u8 proto, u32 ste_index)
 Get ST entry by index and protocol. More...
 
void nad64_db_st_free_expired (nat64_db_t *db, u32 now)
 Free expired session entries in session tables. More...
 
void nat64_db_free_out_addr (nat64_db_t *db, ip4_address_t *out_addr)
 Free sessions using specific outside address. More...
 

Detailed Description

NAT64 DB.

Definition in file nat64_db.c.

Function Documentation

void nad64_db_st_free_expired ( nat64_db_t db,
u32  now 
)

Free expired session entries in session tables.

Parameters
dbNAT64 DB.
nowCurrent time.

Definition at line 638 of file nat64_db.c.

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nat64_db_bib_entry_t* nat64_db_bib_entry_by_index ( nat64_db_t db,
u8  proto,
u32  bibe_index 
)

Get BIB entry by index and protocol.

Parameters
dbNAT64 DB.
protoL4 protocol.
bibe_indexBIB entry index.
Returns
BIB entry if found.

Definition at line 298 of file nat64_db.c.

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nat64_db_bib_entry_t* nat64_db_bib_entry_create ( nat64_db_t db,
ip6_address_t in_addr,
ip4_address_t out_addr,
u16  in_port,
u16  out_port,
u32  fib_index,
u8  proto,
u8  is_static 
)

Create new NAT64 BIB entry.

Parameters
dbNAT64 DB.
in_addrInside IPv6 address.
out_addrOutside IPv4 address.
in_portInside port number.
out_portOutside port number.
fib_indexFIB index.
protoL4 protocol.
is_static1 if static, 0 if dynamic.
Returns
BIB entry on success, 0 otherwise.

Definition at line 52 of file nat64_db.c.

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nat64_db_bib_entry_t* nat64_db_bib_entry_find ( nat64_db_t db,
ip46_address_t *  addr,
u16  port,
u8  proto,
u32  fib_index,
u8  is_ip6 
)

Find NAT64 BIB entry.

Parameters
dbNAT64 DB.
addrIP address.
portPort number.
protoL4 protocol.
fib_indexFIB index.
is_ip61 if find by IPv6 (inside) address, 0 by IPv4 (outside).
Returns
BIB entry if found.

Definition at line 205 of file nat64_db.c.

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void nat64_db_bib_entry_free ( nat64_db_t db,
nat64_db_bib_entry_t *  bibe 
)

Free NAT64 BIB entry.

Parameters
dbNAT64 DB.
bibeBIB entry.

Definition at line 127 of file nat64_db.c.

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void nat64_db_bib_walk ( nat64_db_t db,
u8  proto,
nat64_db_bib_walk_fn_t  fn,
void *  ctx 
)

Walk NAT64 BIB.

Parameters
dbNAT64 DB.
protoBIB L4 protocol:
  • 255 all BIBs
  • 6 TCP BIB
  • 17 UDP BIB
  • 1/58 ICMP BIB
  • otherwise "unknown" protocol BIB
fnThe function to invoke on each entry visited.
ctxA context passed in the visit function.

Definition at line 247 of file nat64_db.c.

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void nat64_db_free_out_addr ( nat64_db_t db,
ip4_address_t out_addr 
)

Free sessions using specific outside address.

Parameters
dbNAT64 DB.
out_addrOutside address to match.

Definition at line 670 of file nat64_db.c.

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int nat64_db_init ( nat64_db_t db,
u32  bib_buckets,
u32  bib_memory_size,
u32  st_buckets,
u32  st_memory_size,
nat64_db_free_addr_port_function_t  free_addr_port_cb 
)

Initialize NAT64 DB.

Parameters
dbNAT64 DB.
bib_bucketsNumber of BIB hash buckets.
bib_memory_sizeMemory size of BIB hash.
st_bucketsNumber of session table hash buckets.
st_memory_sizeMemory size of session table hash.
free_addr_port_cbCall back function to free address and port.
Returns
0 on success, non-zero value otherwise.

Definition at line 25 of file nat64_db.c.

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nat64_db_st_entry_t* nat64_db_st_entry_by_index ( nat64_db_t db,
u8  proto,
u32  ste_index 
)

Get ST entry by index and protocol.

Parameters
dbNAT64 DB.
protoL4 protocol.
bibe_indexST entry index.
Returns
BIB entry if found.

Definition at line 615 of file nat64_db.c.

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nat64_db_st_entry_t* nat64_db_st_entry_create ( nat64_db_t db,
nat64_db_bib_entry_t *  bibe,
ip6_address_t in_r_addr,
ip4_address_t out_r_addr,
u16  r_port 
)

Create new NAT64 session table entry.

Parameters
dbNAT64 DB.
bibeCorresponding BIB entry.
in_r_addrInside IPv6 address of the remote host.
out_r_addrOutside IPv4 address of the remote host.
r_portRemote host port number.
Returns
BIB entry on success, 0 otherwise.

Definition at line 372 of file nat64_db.c.

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nat64_db_st_entry_t* nat64_db_st_entry_find ( nat64_db_t db,
ip46_address_t *  l_addr,
ip46_address_t *  r_addr,
u16  l_port,
u16  r_port,
u8  proto,
u32  fib_index,
u8  is_ip6 
)

Find NAT64 session table entry.

Parameters
dbNAT64 DB.
l_addrLocal host address.
r_addrRemote host address.
l_portLocal host port number.
r_portRemote host port number.
protoL4 protocol.
fib_indexFIB index.
is_ip61 if find by IPv6 (inside) address, 0 by IPv4 (outside).
Returns
BIB entry if found.

Definition at line 544 of file nat64_db.c.

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void nat64_db_st_entry_free ( nat64_db_t db,
nat64_db_st_entry_t *  ste 
)

Free NAT64 session table entry.

Parameters
dbNAT64 DB.
steSession table entry.

Definition at line 464 of file nat64_db.c.

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u32 nat64_db_st_entry_get_index ( nat64_db_t db,
nat64_db_st_entry_t *  ste 
)

Definition at line 592 of file nat64_db.c.

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void nat64_db_st_walk ( nat64_db_t db,
u8  proto,
nat64_db_st_walk_fn_t  fn,
void *  ctx 
)

Walk NAT64 session table.

Parameters
dbNAT64 DB.
protoL4 protocol:
  • 255 all session tables
  • 6 TCP session table
  • 17 UDP session table
  • 1/58 ICMP session table
  • otherwise "unknown" protocol session table
fnThe function to invoke on each entry visited.
ctxA context passed in the visit function.

Definition at line 321 of file nat64_db.c.

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