ip_path_mtu.c File Reference

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Data Structures
struct	ip_path_mtu_adj_delegate_t_
	Delegate added to adjacencies to track path MTU. More...
struct	ip_pmtu_key_t_
struct	ip_path_mtu_walk_sweep_ctx_t_

Macros
#define	IP_PMTU_TRKR_DBG(_ipt, _fmt, _args...)
#define	IP_PMTU_DBG(_fmt, _args...)

Typedefs
typedef struct ip_path_mtu_adj_delegate_t_	ip_path_mtu_adj_delegate_t
	Delegate added to adjacencies to track path MTU. More...
typedef struct ip_pmtu_key_t_	ip_pmtu_key_t
typedef struct ip_path_mtu_walk_sweep_ctx_t_	ip_path_mtu_walk_sweep_ctx_t

Functions
static u8 *	format_ip_pmtu_flags (u8 *s, va_list *ap)
u32	ip_pmtu_get_table_id (const ip_pmtu_t *ipt)
void	ip_pmtu_get_ip (const ip_pmtu_t *ipt, ip_address_t *ip)
static u8 *	format_ip_pmtu (u8 *s, va_list *ap)
static u8 *	format_ip_path_mtu_adj_delegate (const adj_delegate_t *aed, u8 *s)
static void	ip_pmtu_adj_delegate_adj_created (adj_index_t ai)
static void	ip_pmtu_adj_delegate_adj_deleted (adj_delegate_t *ad)
static void	ip_pmtu_adj_delegate_adj_modified (adj_delegate_t *ad)
static bool	ip_path_mtu_value_invalid (u16 pmtu)
static adj_walk_rc_t	ip_ptmu_adj_walk_remove (adj_index_t ai, void *ctx)
static adj_walk_rc_t	ip_ptmu_adj_walk_update (adj_index_t ai, void *ctx)
static ip_pmtu_dpo_t *	ip_pmtu_dpo_alloc (void)
static ip_pmtu_dpo_t *	ip_pmtu_dpo_get_from_dpo (const dpo_id_t *dpo)
static index_t	ip_pmtu_dpo_get_index (ip_pmtu_dpo_t *ipm)
static void	ip_pmtu_dpo_lock (dpo_id_t *dpo)
static void	ip_pmtu_dpo_unlock (dpo_id_t *dpo)
static u32	ip_pmtu_dpo_get_urpf (const dpo_id_t *dpo)
void	ip_pmtu_dpo_add_or_lock (fib_protocol_t fproto, u16 pmtu, dpo_id_t *dpo)
u8 *	format_ip_pmtu_dpo (u8 *s, va_list *ap)
static void	ip_pmtu_dpo_interpose (const dpo_id_t *original, const dpo_id_t *parent, dpo_id_t *clone)
	Interpose a path MTU DPO. More...
static u16	ip_pmtu_dpo_get_mtu (const dpo_id_t *dpo)
static bool	ip_mtu_fib_entry_is_attached (fib_node_index_t fib_entry)
static index_t	ip_pmtu_alloc (u32 fib_index, const fib_prefix_t *pfx, const ip_pmtu_key_t *key, u16 pmtu)
static void	ip_pmtu_stack (ip_pmtu_t *ipt)
static void	ip_pmtu_update (index_t ipti, u16 pmtu)
static index_t	ip_pmtu_destroy (index_t ipti, const ip_pmtu_key_t *key)
int	ip_path_mtu_update (const ip_address_t *nh, u32 table_id, u16 pmtu)
static walk_rc_t	ip_path_mtu_walk_mark (index_t ipti, void *ctx)
static walk_rc_t	ip_path_mtu_walk_sweep (index_t ipti, void *arg)
int	ip_path_mtu_replace_begin (void)
int	ip_path_mtu_replace_end (void)
void	ip_path_mtu_walk (ip_path_mtu_walk_t fn, void *ctx)
static fib_node_t *	ip_pmtu_get_node (fib_node_index_t index)
static ip_pmtu_t *	ip_pmtu_get_from_node (fib_node_t *node)
static void	ip_pmtu_last_lock_gone (fib_node_t *node)
static fib_node_back_walk_rc_t	ip_pmtu_back_walk_notify (fib_node_t *node, fib_node_back_walk_ctx_t *ctx)
static clib_error_t *	ip_path_module_init (vlib_main_t *vm)
static clib_error_t *	show_ip_pmtu_command (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)

Variables
static vlib_log_class_t	ip_pmtu_logger
	Path MTU. More...
static adj_delegate_type_t	ip_pmtu_adj_delegate_type
static fib_source_t	ip_pmtu_source
ip_pmtu_dpo_t *	ip_pmtu_dpo_pool
	DPO pool. More...
static dpo_type_t	ip_pmtu_dpo_type
	DPO type registered for these GBP FWD. More...
static fib_node_type_t	ip_pmtu_fib_type
	Fib node type for the tracker. More...
ip_pmtu_t *	ip_pmtu_pool
	Path MTU tracker pool. More...
static ip_path_mtu_adj_delegate_t *	ip_path_mtu_adj_delegate_pool
static uword *	ip_pmtu_db
const adj_delegate_vft_t	ip_path_adj_delegate_vft
const static dpo_vft_t	ip_pmtu_dpo_vft
const static char *const	ip_pmtu_dpo_ip4_nodes []
	The per-protocol VLIB graph nodes that are assigned to a glean object. More...
const static char *const	ip_pmtu_dpo_ip6_nodes []
const static char *const *const	ip_pmtu_dpo_nodes [DPO_PROTO_NUM]
static const fib_node_vft_t	ip_ptmu_fib_node_vft
static vlib_cli_command_t	show_fib_entry
	(constructor) VLIB_CLI_COMMAND (show_fib_entry) More...

Macro Definition Documentation

IP_PMTU_DBG

#define IP_PMTU_DBG	(		_fmt,
			_args...
	)

Value:

  {                                                                           \
    vlib_log_debug (ip_pmtu_logger, _fmt ": ", ##_args);                      \
  }

Definition at line 94 of file ip_path_mtu.c.

IP_PMTU_TRKR_DBG

#define IP_PMTU_TRKR_DBG	(		_ipt,
			_fmt,
			_args...
	)

Value:

  {                                                                           \
    vlib_log_debug (ip_pmtu_logger, "[%U]: " _fmt ": ", format_ip_pmtu(),       \
                    _ipt - ip_pmtu_pool, ##_args);                            \
  }

Definition at line 89 of file ip_path_mtu.c.

Typedef Documentation

ip_path_mtu_adj_delegate_t

typedef struct ip_path_mtu_adj_delegate_t_ ip_path_mtu_adj_delegate_t

Delegate added to adjacencies to track path MTU.

ip_path_mtu_walk_sweep_ctx_t

typedef struct ip_path_mtu_walk_sweep_ctx_t_ ip_path_mtu_walk_sweep_ctx_t

ip_pmtu_key_t

typedef struct ip_pmtu_key_t_ ip_pmtu_key_t

Function Documentation

format_ip_path_mtu_adj_delegate()

static u8* format_ip_path_mtu_adj_delegate ( const adj_delegate_t *  aed, u8 *  s  )

static

Definition at line 156 of file ip_path_mtu.c.

format_ip_pmtu()

static u8* format_ip_pmtu ( u8 *  s, va_list *  ap  )

static

Definition at line 135 of file ip_path_mtu.c.

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format_ip_pmtu_dpo()

u8* format_ip_pmtu_dpo	(	u8 *	s,
		va_list *	ap
	)

Definition at line 372 of file ip_path_mtu.c.

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format_ip_pmtu_flags()

static u8* format_ip_pmtu_flags ( u8 *  s, va_list *  ap  )

static

Definition at line 100 of file ip_path_mtu.c.

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ip_mtu_fib_entry_is_attached()

static bool ip_mtu_fib_entry_is_attached ( fib_node_index_t  fib_entry )

static

Definition at line 449 of file ip_path_mtu.c.

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ip_path_module_init()

static clib_error_t* ip_path_module_init ( vlib_main_t *  vm )

static

Definition at line 823 of file ip_path_mtu.c.

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ip_path_mtu_replace_begin()

int ip_path_mtu_replace_begin

(

void

)

Definition at line 718 of file ip_path_mtu.c.

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ip_path_mtu_replace_end()

int ip_path_mtu_replace_end

(

void

)

Definition at line 728 of file ip_path_mtu.c.

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ip_path_mtu_update()

int ip_path_mtu_update	(	const ip_address_t *	nh,
		u32	table_id,
		u16	pmtu
	)

Definition at line 647 of file ip_path_mtu.c.

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ip_path_mtu_value_invalid()

static bool ip_path_mtu_value_invalid ( u16  pmtu )

static

Definition at line 248 of file ip_path_mtu.c.

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ip_path_mtu_walk()

void ip_path_mtu_walk	(	ip_path_mtu_walk_t	fn,
		void *	ctx
	)

Definition at line 760 of file ip_path_mtu.c.

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ip_path_mtu_walk_mark()

static walk_rc_t ip_path_mtu_walk_mark ( index_t  ipti, void *  ctx  )

static

Definition at line 685 of file ip_path_mtu.c.

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ip_path_mtu_walk_sweep()

static walk_rc_t ip_path_mtu_walk_sweep ( index_t  ipti, void *  arg  )

static

Definition at line 702 of file ip_path_mtu.c.

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ip_pmtu_adj_delegate_adj_created()

static void ip_pmtu_adj_delegate_adj_created ( adj_index_t  ai )

static

Definition at line 168 of file ip_path_mtu.c.

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ip_pmtu_adj_delegate_adj_deleted()

static void ip_pmtu_adj_delegate_adj_deleted ( adj_delegate_t *  ad )

static

Definition at line 225 of file ip_path_mtu.c.

ip_pmtu_adj_delegate_adj_modified()

static void ip_pmtu_adj_delegate_adj_modified ( adj_delegate_t *  ad )

static

Definition at line 231 of file ip_path_mtu.c.

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ip_pmtu_alloc()

static index_t ip_pmtu_alloc ( u32  fib_index, const fib_prefix_t *  pfx, const ip_pmtu_key_t *  key, u16  pmtu  )

static

Definition at line 469 of file ip_path_mtu.c.

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ip_pmtu_back_walk_notify()

static fib_node_back_walk_rc_t ip_pmtu_back_walk_notify ( fib_node_t *  node, fib_node_back_walk_ctx_t *  ctx  )

static

Definition at line 801 of file ip_path_mtu.c.

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ip_pmtu_destroy()

static index_t ip_pmtu_destroy ( index_t  ipti, const ip_pmtu_key_t *  key  )

static

Definition at line 613 of file ip_path_mtu.c.

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ip_pmtu_dpo_add_or_lock()

void ip_pmtu_dpo_add_or_lock	(	fib_protocol_t	fproto,
		u16	pmtu,
		dpo_id_t *	dpo
	)

Definition at line 356 of file ip_path_mtu.c.

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ip_pmtu_dpo_alloc()

static ip_pmtu_dpo_t* ip_pmtu_dpo_alloc ( void  )

static

Definition at line 298 of file ip_path_mtu.c.

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ip_pmtu_dpo_get_from_dpo()

static ip_pmtu_dpo_t* ip_pmtu_dpo_get_from_dpo ( const dpo_id_t *  dpo )

static

Definition at line 308 of file ip_path_mtu.c.

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ip_pmtu_dpo_get_index()

static index_t ip_pmtu_dpo_get_index ( ip_pmtu_dpo_t *  ipm )

static

Definition at line 316 of file ip_path_mtu.c.

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ip_pmtu_dpo_get_mtu()

static u16 ip_pmtu_dpo_get_mtu ( const dpo_id_t *  dpo )

static

Definition at line 408 of file ip_path_mtu.c.

ip_pmtu_dpo_get_urpf()

static u32 ip_pmtu_dpo_get_urpf ( const dpo_id_t *  dpo )

static

Definition at line 346 of file ip_path_mtu.c.

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ip_pmtu_dpo_interpose()

static void ip_pmtu_dpo_interpose ( const dpo_id_t *  original, const dpo_id_t *  parent, dpo_id_t *  clone  )

static

Interpose a path MTU DPO.

Definition at line 390 of file ip_path_mtu.c.

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ip_pmtu_dpo_lock()

static void ip_pmtu_dpo_lock ( dpo_id_t *  dpo )

static

Definition at line 322 of file ip_path_mtu.c.

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ip_pmtu_dpo_unlock()

static void ip_pmtu_dpo_unlock ( dpo_id_t *  dpo )

static

Definition at line 331 of file ip_path_mtu.c.

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ip_pmtu_get_from_node()

static ip_pmtu_t* ip_pmtu_get_from_node ( fib_node_t *  node )

static

Definition at line 782 of file ip_path_mtu.c.

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ip_pmtu_get_ip()

void ip_pmtu_get_ip	(	const ip_pmtu_t *	ipt,
		ip_address_t *	ip
	)

Definition at line 126 of file ip_path_mtu.c.

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ip_pmtu_get_node()

static fib_node_t* ip_pmtu_get_node ( fib_node_index_t  index )

static

Definition at line 772 of file ip_path_mtu.c.

ip_pmtu_get_table_id()

u32 ip_pmtu_get_table_id

(

const ip_pmtu_t *

ipt

)

Definition at line 114 of file ip_path_mtu.c.

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ip_pmtu_last_lock_gone()

static void ip_pmtu_last_lock_gone ( fib_node_t *  node )

static

Definition at line 789 of file ip_path_mtu.c.

ip_pmtu_stack()

static void ip_pmtu_stack ( ip_pmtu_t *  ipt )

static

Definition at line 532 of file ip_path_mtu.c.

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ip_pmtu_update()

static void ip_pmtu_update ( index_t  ipti, u16  pmtu  )

static

Definition at line 601 of file ip_path_mtu.c.

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ip_ptmu_adj_walk_remove()

static adj_walk_rc_t ip_ptmu_adj_walk_remove ( adj_index_t  ai, void *  ctx  )

static

Definition at line 254 of file ip_path_mtu.c.

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ip_ptmu_adj_walk_update()

static adj_walk_rc_t ip_ptmu_adj_walk_update ( adj_index_t  ai, void *  ctx  )

static

Definition at line 271 of file ip_path_mtu.c.

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show_ip_pmtu_command()

static clib_error_t* show_ip_pmtu_command ( vlib_main_t *  vm, unformat_input_t *  input, vlib_cli_command_t *  cmd  )

static

Definition at line 842 of file ip_path_mtu.c.

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Variable Documentation

ip_path_adj_delegate_vft

const adj_delegate_vft_t ip_path_adj_delegate_vft

Initial value:

= {
  .adv_format = format_ip_path_mtu_adj_delegate,
  .adv_adj_deleted = ip_pmtu_adj_delegate_adj_deleted,
  .adv_adj_modified = ip_pmtu_adj_delegate_adj_modified,
  .adv_adj_created = ip_pmtu_adj_delegate_adj_created,
}

Definition at line 240 of file ip_path_mtu.c.

ip_path_mtu_adj_delegate_pool

ip_path_mtu_adj_delegate_t* ip_path_mtu_adj_delegate_pool

static

Definition at line 77 of file ip_path_mtu.c.

ip_pmtu_adj_delegate_type

adj_delegate_type_t ip_pmtu_adj_delegate_type

static

Definition at line 46 of file ip_path_mtu.c.

ip_pmtu_db

uword* ip_pmtu_db

static

Definition at line 87 of file ip_path_mtu.c.

ip_pmtu_dpo_ip4_nodes

const static char* const ip_pmtu_dpo_ip4_nodes[]

static

Initial value:

= {
  "ip4-pmtu-dpo",
  NULL,
}

The per-protocol VLIB graph nodes that are assigned to a glean object.

this means that these graph nodes are ones from which a glean is the parent object in the DPO-graph.

Definition at line 433 of file ip_path_mtu.c.

ip_pmtu_dpo_ip6_nodes

const static char* const ip_pmtu_dpo_ip6_nodes[]

static

Initial value:

= {
  "ip6-pmtu-dpo",
  NULL,
}

Definition at line 438 of file ip_path_mtu.c.

ip_pmtu_dpo_nodes

const static char* const * const ip_pmtu_dpo_nodes[DPO_PROTO_NUM]

static

Initial value:

= {
  [DPO_PROTO_IP4] = ip_pmtu_dpo_ip4_nodes,
  [DPO_PROTO_IP6] = ip_pmtu_dpo_ip6_nodes,
}

Definition at line 443 of file ip_path_mtu.c.

ip_pmtu_dpo_pool

ip_pmtu_dpo_t* ip_pmtu_dpo_pool

DPO pool.

Data-plane accessor functions.

Definition at line 52 of file ip_path_mtu.c.

ip_pmtu_dpo_type

dpo_type_t ip_pmtu_dpo_type

static

DPO type registered for these GBP FWD.

Definition at line 57 of file ip_path_mtu.c.

ip_pmtu_dpo_vft

const static dpo_vft_t ip_pmtu_dpo_vft

static

Initial value:

= {
  .dv_lock = ip_pmtu_dpo_lock,
  .dv_unlock = ip_pmtu_dpo_unlock,
  .dv_format = format_ip_pmtu_dpo,
  .dv_get_urpf = ip_pmtu_dpo_get_urpf,
  .dv_mk_interpose = ip_pmtu_dpo_interpose,
  .dv_get_mtu = ip_pmtu_dpo_get_mtu,
}

Definition at line 417 of file ip_path_mtu.c.

ip_pmtu_fib_type

fib_node_type_t ip_pmtu_fib_type

static

Fib node type for the tracker.

Definition at line 62 of file ip_path_mtu.c.

ip_pmtu_logger

vlib_log_class_t ip_pmtu_logger

static

Path MTU.

A path is a peer. A peer is known by an IP address (in a table). Insert a DPO in the forwarding chain for the peer to perform the fragmentation. For attached peers, all traffic will use the peer's adjacency, there is already an MTU chekc in the adjacency (for the link's MTU) so as an optimisation, instead of using a DPO, we add a delegate to the adjacency to set the adjacency's MTU to the path MTU. the logger

Definition at line 44 of file ip_path_mtu.c.

ip_pmtu_pool

ip_pmtu_t* ip_pmtu_pool

Path MTU tracker pool.

Definition at line 67 of file ip_path_mtu.c.

ip_pmtu_source

fib_source_t ip_pmtu_source

static

Definition at line 47 of file ip_path_mtu.c.

ip_ptmu_fib_node_vft

const fib_node_vft_t ip_ptmu_fib_node_vft

static

Initial value:

= {
  .fnv_get = ip_pmtu_get_node,
  .fnv_last_lock = ip_pmtu_last_lock_gone,
  .fnv_back_walk = ip_pmtu_back_walk_notify,
}

Definition at line 816 of file ip_path_mtu.c.

show_fib_entry

vlib_cli_command_t show_fib_entry

static

Initial value:

= {
  .path = "show ip pmtu",
  .function = show_ip_pmtu_command,
  .short_help = "show ip path MTU",
}

(constructor) VLIB_CLI_COMMAND (show_fib_entry)

Definition at line 871 of file ip_path_mtu.c.