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Vector Packet Processing
nat_reass.h File Reference

NAT plugin virtual fragmentation reassembly. More...

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Data Structures

struct  nat_reass_ip4_key_t
 
struct  nat_reass_ip6_key_t
 
struct  nat_reass_main_t
 

Macros

#define NAT_REASS_TIMEOUT_DEFAULT   2
 
#define NAT_MAX_REASS_DEAFULT   1024
 
#define NAT_MAX_FRAG_DEFAULT   5
 
#define NAT_REASS_HT_LOAD_FACTOR   (0.75)
 

Typedefs

typedef int(* nat_ip4_reass_walk_fn_t) (nat_reass_ip4_t *reass, void *ctx)
 Call back function when walking IPv4 reassemblies, non-zero return value stop walk. More...
 
typedef int(* nat_ip6_reass_walk_fn_t) (nat_reass_ip6_t *reass, void *ctx)
 Call back function when walking IPv6 reassemblies, non-zero return value stop walk. More...
 

Functions

typedef CLIB_PACKED (struct{nat_reass_ip4_key_t key;u32 lru_list_index;u32 sess_index;u32 thread_index;f64 last_heard;u32 frags_per_reass_list_head_index;u8 frag_n;}) nat_reass_ip4_t
 
typedef CLIB_PACKED (struct{nat_reass_ip6_key_t key;u32 lru_list_index;u32 sess_index;f64 last_heard;u32 frags_per_reass_list_head_index;u8 frag_n;}) nat_reass_ip6_t
 
int nat_reass_set (u32 timeout, u16 max_reass, u8 max_frag, u8 drop_frag, u8 is_ip6)
 Set NAT virtual fragmentation reassembly configuration. More...
 
u32 nat_reass_get_timeout (u8 is_ip6)
 Get reassembly timeout. More...
 
u16 nat_reass_get_max_reass (u8 is_ip6)
 Get maximum number of concurrent reassemblies. More...
 
u8 nat_reass_get_max_frag (u8 is_ip6)
 Get maximum number of fragmets per reassembly. More...
 
u8 nat_reass_is_drop_frag (u8 is_ip6)
 Get status of virtual fragmentation reassembly. More...
 
clib_error_tnat_reass_init (vlib_main_t *vm)
 Initialize NAT virtual fragmentation reassembly. More...
 
nat_reass_ip4_t * nat_ip4_reass_find (ip4_address_t src, ip4_address_t dst, u16 frag_id, u8 proto)
 Find reassembly. More...
 
nat_reass_ip4_t * nat_ip4_reass_find_or_create (ip4_address_t src, ip4_address_t dst, u16 frag_id, u8 proto, u8 reset_timeout, u32 **bi_to_drop)
 Find or create reassembly. More...
 
int nat_ip4_reass_add_fragment (nat_reass_ip4_t *reass, u32 bi)
 Cache fragment. More...
 
void nat_ip4_reass_get_frags (nat_reass_ip4_t *reass, u32 **bi)
 Get cached fragments. More...
 
void nat_ip4_reass_walk (nat_ip4_reass_walk_fn_t fn, void *ctx)
 Walk IPv4 reassemblies. More...
 
nat_reass_ip6_t * nat_ip6_reass_find_or_create (ip6_address_t src, ip6_address_t dst, u32 frag_id, u8 proto, u8 reset_timeout, u32 **bi_to_drop)
 Find or create reassembly. More...
 
int nat_ip6_reass_add_fragment (nat_reass_ip6_t *reass, u32 bi)
 Cache fragment. More...
 
void nat_ip6_reass_get_frags (nat_reass_ip6_t *reass, u32 **bi)
 Get cached fragments. More...
 
void nat_ip6_reass_walk (nat_ip6_reass_walk_fn_t fn, void *ctx)
 Walk IPv6 reassemblies. More...
 

Detailed Description

NAT plugin virtual fragmentation reassembly.

Definition in file nat_reass.h.

Macro Definition Documentation

#define NAT_MAX_FRAG_DEFAULT   5

Definition at line 30 of file nat_reass.h.

#define NAT_MAX_REASS_DEAFULT   1024

Definition at line 29 of file nat_reass.h.

#define NAT_REASS_HT_LOAD_FACTOR   (0.75)

Definition at line 31 of file nat_reass.h.

#define NAT_REASS_TIMEOUT_DEFAULT   2

Definition at line 28 of file nat_reass.h.

Typedef Documentation

typedef int(* nat_ip4_reass_walk_fn_t) (nat_reass_ip4_t *reass, void *ctx)

Call back function when walking IPv4 reassemblies, non-zero return value stop walk.

Definition at line 242 of file nat_reass.h.

typedef int(* nat_ip6_reass_walk_fn_t) (nat_reass_ip6_t *reass, void *ctx)

Call back function when walking IPv6 reassemblies, non-zero return value stop walk.

Definition at line 291 of file nat_reass.h.

Function Documentation

typedef CLIB_PACKED ( struct{nat_reass_ip4_key_t key;u32 lru_list_index;u32 sess_index;u32 thread_index;f64 last_heard;u32 frags_per_reass_list_head_index;u8 frag_n;}  )
typedef CLIB_PACKED ( struct{nat_reass_ip6_key_t key;u32 lru_list_index;u32 sess_index;f64 last_heard;u32 frags_per_reass_list_head_index;u8 frag_n;}  )
int nat_ip4_reass_add_fragment ( nat_reass_ip4_t *  reass,
u32  bi 
)

Cache fragment.

Parameters
reassReassembly data.
biBuffer index.
Returns
0 on success, non-zero value otherwise.

Definition at line 328 of file nat_reass.c.

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nat_reass_ip4_t* nat_ip4_reass_find ( ip4_address_t  src,
ip4_address_t  dst,
u16  frag_id,
u8  proto 
)

Find reassembly.

Parameters
srcSource IPv4 address.
dstDestination IPv4 address.
frag_idFragment ID.
protoL4 protocol.
Returns
Reassembly data or 0 if not found.

Definition at line 198 of file nat_reass.c.

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nat_reass_ip4_t* nat_ip4_reass_find_or_create ( ip4_address_t  src,
ip4_address_t  dst,
u16  frag_id,
u8  proto,
u8  reset_timeout,
u32 **  bi_to_drop 
)

Find or create reassembly.

Parameters
srcSource IPv4 address.
dstDestination IPv4 address.
frag_idFragment ID.
protoL4 protocol.
reset_timeoutIf non-zero value reset timeout.
bi_to_dropFragments to drop.
Returns
Reassembly data or 0 on failure.

Definition at line 219 of file nat_reass.c.

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void nat_ip4_reass_get_frags ( nat_reass_ip4_t *  reass,
u32 **  bi 
)

Get cached fragments.

Parameters
reassReassembly data.
biVector of buffer indexes.

Definition at line 353 of file nat_reass.c.

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void nat_ip4_reass_walk ( nat_ip4_reass_walk_fn_t  fn,
void *  ctx 
)

Walk IPv4 reassemblies.

Parameters
fnThe function to invoke on each entry visited.
ctxA context passed in the visit function.

Definition at line 365 of file nat_reass.c.

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int nat_ip6_reass_add_fragment ( nat_reass_ip6_t *  reass,
u32  bi 
)

Cache fragment.

Parameters
reassReassembly data.
biBuffer index.
Returns
0 on success, non-zero value otherwise.

Definition at line 520 of file nat_reass.c.

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nat_reass_ip6_t* nat_ip6_reass_find_or_create ( ip6_address_t  src,
ip6_address_t  dst,
u32  frag_id,
u8  proto,
u8  reset_timeout,
u32 **  bi_to_drop 
)

Find or create reassembly.

Parameters
srcSource IPv6 address.
dstDestination IPv6 address.
frag_idFragment ID.
protoL4 protocol.
reset_timeoutIf non-zero value reset timeout.
bi_to_dropFragments to drop.
Returns
Reassembly data or 0 on failure.

Definition at line 409 of file nat_reass.c.

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void nat_ip6_reass_get_frags ( nat_reass_ip6_t *  reass,
u32 **  bi 
)

Get cached fragments.

Parameters
reassReassembly data.
biVector of buffer indexes.

Definition at line 545 of file nat_reass.c.

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void nat_ip6_reass_walk ( nat_ip6_reass_walk_fn_t  fn,
void *  ctx 
)

Walk IPv6 reassemblies.

Parameters
fnThe function to invoke on each entry visited.
ctxA context passed in the visit function.

Definition at line 557 of file nat_reass.c.

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u8 nat_reass_get_max_frag ( u8  is_ip6)

Get maximum number of fragmets per reassembly.

Parameters
is_ip61 if IPv6, 0 if IPv4.
Returns
maximum number of fragmets per reassembly.

Definition at line 156 of file nat_reass.c.

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u16 nat_reass_get_max_reass ( u8  is_ip6)

Get maximum number of concurrent reassemblies.

Parameters
is_ip61 if IPv6, 0 if IPv4.
Returns
maximum number of concurrent reassemblies.

Definition at line 145 of file nat_reass.c.

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u32 nat_reass_get_timeout ( u8  is_ip6)

Get reassembly timeout.

Parameters
is_ip61 if IPv6, 0 if IPv4.
Returns
reassembly timeout.

Definition at line 134 of file nat_reass.c.

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clib_error_t* nat_reass_init ( vlib_main_t vm)

Initialize NAT virtual fragmentation reassembly.

Parameters
vmvlib main.
Returns
error code.

Definition at line 576 of file nat_reass.c.

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u8 nat_reass_is_drop_frag ( u8  is_ip6)

Get status of virtual fragmentation reassembly.

Parameters
is_ip61 if IPv6, 0 if IPv4.
Returns
zero if translate fragments, non-zero value if drop fragments.

Definition at line 167 of file nat_reass.c.

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int nat_reass_set ( u32  timeout,
u16  max_reass,
u8  max_frag,
u8  drop_frag,
u8  is_ip6 
)

Set NAT virtual fragmentation reassembly configuration.

Parameters
timeoutReassembly timeout.
max_reassMaximum number of concurrent reassemblies.
max_fragMaximum number of fragmets per reassembly
drop_fragIf zero translate fragments, otherwise drop fragments.
is_ip61 if IPv6, 0 if IPv4.
Returns
0 on success, non-zero value otherwise.

Definition at line 84 of file nat_reass.c.

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