session_lookup.c File Reference

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Typedefs
typedef clib_bihash_kv_16_8_t	session_kv4_t
typedef clib_bihash_kv_48_8_t	session_kv6_t
typedef struct _ip4_session_table_show_ctx_t	ip4_session_table_show_ctx_t

Functions
typedef	CLIB_PACKED (struct{union{struct{ip4_address_t src;ip4_address_t dst;u16 src_port;u16 dst_port;u32 proto;};u64 as_u64[2];};})
static void	make_v4_ss_kv (session_kv4_t *kv, ip4_address_t *lcl, ip4_address_t *rmt, u16 lcl_port, u16 rmt_port, u8 proto)
static void	make_v4_listener_kv (session_kv4_t *kv, ip4_address_t *lcl, u16 lcl_port, u8 proto)
static void	make_v4_proxy_kv (session_kv4_t *kv, ip4_address_t *lcl, u8 proto)
static void	make_v4_ss_kv_from_tc (session_kv4_t *kv, transport_connection_t *tc)
static void	make_v6_ss_kv (session_kv6_t *kv, ip6_address_t *lcl, ip6_address_t *rmt, u16 lcl_port, u16 rmt_port, u8 proto)
static void	make_v6_listener_kv (session_kv6_t *kv, ip6_address_t *lcl, u16 lcl_port, u8 proto)
static void	make_v6_proxy_kv (session_kv6_t *kv, ip6_address_t *lcl, u8 proto)
static void	make_v6_ss_kv_from_tc (session_kv6_t *kv, transport_connection_t *tc)
static session_table_t *	session_table_get_or_alloc (u8 fib_proto, u8 fib_index)
static session_table_t *	session_table_get_or_alloc_for_connection (transport_connection_t *tc)
static session_table_t *	session_table_get_for_connection (transport_connection_t *tc)
static session_table_t *	session_table_get_for_fib_index (u32 fib_proto, u32 fib_index)
u32	session_lookup_get_index_for_fib (u32 fib_proto, u32 fib_index)
int	session_lookup_add_connection (transport_connection_t *tc, u64 value)
	Add transport connection to a session table. More...
int	session_lookup_add_session_endpoint (u32 table_index, session_endpoint_t *sep, u64 value)
int	session_lookup_del_session_endpoint (u32 table_index, session_endpoint_t *sep)
int	session_lookup_del_connection (transport_connection_t *tc)
	Delete transport connection from session table. More...
int	session_lookup_del_session (stream_session_t *s)
static u8	session_lookup_action_index_is_valid (u32 action_index)
static u64	session_lookup_action_to_handle (u32 action_index)
static stream_session_t *	session_lookup_app_listen_session (u32 app_index, u8 fib_proto, u8 transport_proto)
static stream_session_t *	session_lookup_action_to_session (u32 action_index, u8 fib_proto, u8 transport_proto)
stream_session_t *	session_lookup_rules_table_session4 (session_table_t *st, u8 proto, ip4_address_t *lcl, u16 lcl_port, ip4_address_t *rmt, u16 rmt_port)
	UNUSED. More...
stream_session_t *	session_lookup_rules_table_session6 (session_table_t *st, u8 proto, ip6_address_t *lcl, u16 lcl_port, ip6_address_t *rmt, u16 rmt_port)
	UNUSED. More...
u64	session_lookup_endpoint_listener (u32 table_index, session_endpoint_t *sep, u8 use_rules)
	Lookup listener for session endpoint in table. More...
u64	session_lookup_local_endpoint (u32 table_index, session_endpoint_t *sep)
	Look up endpoint in local session table. More...
static stream_session_t *	session_lookup_listener4_i (session_table_t *st, ip4_address_t *lcl, u16 lcl_port, u8 proto, u8 use_wildcard)
stream_session_t *	session_lookup_listener4 (u32 fib_index, ip4_address_t *lcl, u16 lcl_port, u8 proto)
static stream_session_t *	session_lookup_listener6_i (session_table_t *st, ip6_address_t *lcl, u16 lcl_port, u8 proto, u8 ip_wildcard)
stream_session_t *	session_lookup_listener6 (u32 fib_index, ip6_address_t *lcl, u16 lcl_port, u8 proto)
stream_session_t *	session_lookup_listener (u32 table_index, session_endpoint_t *sep)
	Lookup listener, exact or proxy (inaddr_any:0) match. More...
int	session_lookup_add_half_open (transport_connection_t *tc, u64 value)
int	session_lookup_del_half_open (transport_connection_t *tc)
u64	session_lookup_half_open_handle (transport_connection_t *tc)
transport_connection_t *	session_lookup_half_open_connection (u64 handle, u8 proto, u8 is_ip4)
transport_connection_t *	session_lookup_connection_wt4 (u32 fib_index, ip4_address_t *lcl, ip4_address_t *rmt, u16 lcl_port, u16 rmt_port, u8 proto, u32 thread_index, u8 *is_filtered)
	Lookup connection with ip4 and transport layer information. More...
transport_connection_t *	session_lookup_connection4 (u32 fib_index, ip4_address_t *lcl, ip4_address_t *rmt, u16 lcl_port, u16 rmt_port, u8 proto)
	Lookup connection with ip4 and transport layer information. More...
stream_session_t *	session_lookup_safe4 (u32 fib_index, ip4_address_t *lcl, ip4_address_t *rmt, u16 lcl_port, u16 rmt_port, u8 proto)
	Lookup session with ip4 and transport layer information. More...
transport_connection_t *	session_lookup_connection_wt6 (u32 fib_index, ip6_address_t *lcl, ip6_address_t *rmt, u16 lcl_port, u16 rmt_port, u8 proto, u32 thread_index, u8 *is_filtered)
	Lookup connection with ip6 and transport layer information. More...
transport_connection_t *	session_lookup_connection6 (u32 fib_index, ip6_address_t *lcl, ip6_address_t *rmt, u16 lcl_port, u16 rmt_port, u8 proto)
	Lookup connection with ip6 and transport layer information. More...
stream_session_t *	session_lookup_safe6 (u32 fib_index, ip6_address_t *lcl, ip6_address_t *rmt, u16 lcl_port, u16 rmt_port, u8 proto)
	Lookup session with ip6 and transport layer information. More...
clib_error_t *	vnet_session_rule_add_del (session_rule_add_del_args_t *args)
void	session_lookup_set_tables_appns (app_namespace_t *app_ns)
	Mark (global) tables as pertaining to app ns. More...
u8 *	format_ip4_session_lookup_kvp (u8 *s, va_list *args)
static int	ip4_session_table_show (clib_bihash_kv_16_8_t *kvp, void *arg)
void	session_lookup_show_table_entries (vlib_main_t *vm, session_table_t *table, u8 type, u8 is_local)
static clib_error_t *	session_rule_command_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
void	session_lookup_dump_rules_table (u32 fib_index, u8 fib_proto, u8 transport_proto)
void	session_lookup_dump_local_rules_table (u32 table_index, u8 fib_proto, u8 transport_proto)
static clib_error_t *	show_session_rules_command_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
void	session_lookup_init (void)

Variables
transport_proto_vft_t *	tp_vfts
	Generate typed init functions for multiple hash table styles... More...
static u32 *	fib_index_to_table_index [2]
	Network namespace index (i.e., fib index) to session lookup table. More...
	v6_connection_key_t
static vlib_cli_command_t	session_rule_command
	(constructor) VLIB_CLI_COMMAND (session_rule_command) More...
static vlib_cli_command_t	show_session_rules_command
	(constructor) VLIB_CLI_COMMAND (show_session_rules_command) More...

Typedef Documentation

typedef struct _ip4_session_table_show_ctx_t ip4_session_table_show_ctx_t

typedef clib_bihash_kv_16_8_t session_kv4_t

Definition at line 82 of file session_lookup.c.

typedef clib_bihash_kv_48_8_t session_kv6_t

Definition at line 83 of file session_lookup.c.

Function Documentation

typedef CLIB_PACKED

(

struct{union{struct{ip4_address_t src;ip4_address_t dst;u16 src_port;u16 dst_port;u32 proto;};u64 as_u64[2];};}

)

Definition at line 45 of file session_lookup.c.

u8* format_ip4_session_lookup_kvp	(	u8 *	s,
		va_list *	args
	)

Definition at line 1336 of file session_lookup.c.

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static int ip4_session_table_show ( clib_bihash_kv_16_8_t *  kvp, void *  arg  )

static

Definition at line 1373 of file session_lookup.c.

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static void make_v4_listener_kv ( session_kv4_t *  kv, ip4_address_t *  lcl, u16  lcl_port, u8  proto  )

inlinestatic

Definition at line 101 of file session_lookup.c.

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static void make_v4_proxy_kv ( session_kv4_t *  kv, ip4_address_t *  lcl, u8  proto  )

inlinestatic

Definition at line 116 of file session_lookup.c.

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static void make_v4_ss_kv ( session_kv4_t *  kv, ip4_address_t *  lcl, ip4_address_t *  rmt, u16  lcl_port, u16  rmt_port, u8  proto  )

inlinestatic

Definition at line 86 of file session_lookup.c.

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static void make_v4_ss_kv_from_tc ( session_kv4_t *  kv, transport_connection_t *  tc  )

inlinestatic

Definition at line 130 of file session_lookup.c.

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static void make_v6_listener_kv ( session_kv6_t *  kv, ip6_address_t *  lcl, u16  lcl_port, u8  proto  )

inlinestatic

Definition at line 155 of file session_lookup.c.

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static void make_v6_proxy_kv ( session_kv6_t *  kv, ip6_address_t *  lcl, u8  proto  )

inlinestatic

Definition at line 173 of file session_lookup.c.

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static void make_v6_ss_kv ( session_kv6_t *  kv, ip6_address_t *  lcl, ip6_address_t *  rmt, u16  lcl_port, u16  rmt_port, u8  proto  )

inlinestatic

Definition at line 137 of file session_lookup.c.

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static void make_v6_ss_kv_from_tc ( session_kv6_t *  kv, transport_connection_t *  tc  )

inlinestatic

Definition at line 190 of file session_lookup.c.

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static u8 session_lookup_action_index_is_valid ( u32  action_index )

static

Definition at line 383 of file session_lookup.c.

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static u64 session_lookup_action_to_handle ( u32  action_index )

static

Definition at line 392 of file session_lookup.c.

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static stream_session_t* session_lookup_action_to_session ( u32  action_index, u8  fib_proto, u8  transport_proto  )

static

Definition at line 420 of file session_lookup.c.

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int session_lookup_add_connection	(	transport_connection_t *	tc,
		u64	value
	)

Add transport connection to a session table.

Session lookup 5-tuple (src-ip, dst-ip, src-port, dst-port, session-type) is added to requested session table.

Parameters

tc	transport connection to be added
value	value to be stored

Returns

non-zero if failure

Definition at line 264 of file session_lookup.c.

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int session_lookup_add_half_open	(	transport_connection_t *	tc,
		u64	value
	)

Definition at line 768 of file session_lookup.c.

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int session_lookup_add_session_endpoint	(	u32	table_index,
		session_endpoint_t *	sep,
		u64	value
	)

Definition at line 290 of file session_lookup.c.

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static stream_session_t* session_lookup_app_listen_session ( u32  app_index, u8  fib_proto, u8  transport_proto  )

static

Definition at line 408 of file session_lookup.c.

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transport_connection_t* session_lookup_connection4	(	u32	fib_index,
		ip4_address_t *	lcl,
		ip4_address_t *	rmt,
		u16	lcl_port,
		u16	rmt_port,
		u8	proto
	)

Lookup connection with ip4 and transport layer information.

Not optimized. This is used on the fast path so it needs to be fast. Thereby, duplication of code and 'hacks' allowed. Lookup logic is identical to that of session_lookup_connection_wt4

Parameters

fib_index	index of the fib wherein the connection was received
lcl	local ip4 address
rmt	remote ip4 address
lcl_port	local port
rmt_port	remote port
proto	transport protocol (e.g., tcp, udp)

Returns

pointer to transport connection, if one is found, 0 otherwise

Definition at line 965 of file session_lookup.c.

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transport_connection_t* session_lookup_connection6	(	u32	fib_index,
		ip6_address_t *	lcl,
		ip6_address_t *	rmt,
		u16	lcl_port,
		u16	rmt_port,
		u8	proto
	)

Lookup connection with ip6 and transport layer information.

Not optimized. This is used on the fast path so it needs to be fast. Thereby, duplication of code and 'hacks' allowed. Lookup logic is identical to that of session_lookup_connection_wt4

Parameters

fib_index	index of the fib wherein the connection was received
lcl	local ip6 address
rmt	remote ip6 address
lcl_port	local port
rmt_port	remote port
proto	transport protocol (e.g., tcp, udp)

Returns

pointer to transport connection, if one is found, 0 otherwise

Definition at line 1174 of file session_lookup.c.

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transport_connection_t* session_lookup_connection_wt4	(	u32	fib_index,
		ip4_address_t *	lcl,
		ip4_address_t *	rmt,
		u16	lcl_port,
		u16	rmt_port,
		u8	proto,
		u32	thread_index,
		u8 *	is_filtered
	)

Lookup connection with ip4 and transport layer information.

This is used on the fast path so it needs to be fast. Thereby, duplication of code and 'hacks' allowed.

The lookup is incremental and returns whenever something is matched. The steps are:

• Try to find an established session
• Try to find a half-open connection
• Try session rules table
• Try to find a fully-formed or local source wildcarded (listener bound to all interfaces) listener session
• return 0

Parameters

fib_index	index of fib wherein the connection was received
lcl	local ip4 address
rmt	remote ip4 address
lcl_port	local port
rmt_port	remote port
proto	transport protocol (e.g., tcp, udp)
thread_index	thread index for request
is_filtered	return flag that indicates if connection was filtered.

Returns

pointer to transport connection, if one is found, 0 otherwise

Definition at line 888 of file session_lookup.c.

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transport_connection_t* session_lookup_connection_wt6	(	u32	fib_index,
		ip6_address_t *	lcl,
		ip6_address_t *	rmt,
		u16	lcl_port,
		u16	rmt_port,
		u8	proto,
		u32	thread_index,
		u8 *	is_filtered
	)

Lookup connection with ip6 and transport layer information.

This is used on the fast path so it needs to be fast. Thereby, duplication of code and 'hacks' allowed.

The lookup is incremental and returns whenever something is matched. The steps are:

• Try to find an established session
• Try to find a half-open connection
• Try session rules table
• Try to find a fully-formed or local source wildcarded (listener bound to all interfaces) listener session
• return 0

Parameters

fib_index	index of the fib wherein the connection was received
lcl	local ip6 address
rmt	remote ip6 address
lcl_port	local port
rmt_port	remote port
proto	transport protocol (e.g., tcp, udp)
thread_index	thread index for request

Returns

pointer to transport connection, if one is found, 0 otherwise

Definition at line 1106 of file session_lookup.c.

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int session_lookup_del_connection

(

transport_connection_t *

tc

)

Delete transport connection from session table.

Parameters

table_index	session table index
tc	transport connection to be removed

Returns

non-zero if failure

Definition at line 350 of file session_lookup.c.

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int session_lookup_del_half_open

(

transport_connection_t *

tc

)

Definition at line 794 of file session_lookup.c.

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int session_lookup_del_session

(

stream_session_t *

s

)

Definition at line 374 of file session_lookup.c.

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int session_lookup_del_session_endpoint	(	u32	table_index,
		session_endpoint_t *	sep
	)

Definition at line 317 of file session_lookup.c.

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void session_lookup_dump_local_rules_table	(	u32	table_index,
		u8	fib_proto,
		u8	transport_proto
	)

Definition at line 1541 of file session_lookup.c.

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void session_lookup_dump_rules_table	(	u32	fib_index,
		u8	fib_proto,
		u8	transport_proto
	)

Definition at line 1529 of file session_lookup.c.

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u64 session_lookup_endpoint_listener	(	u32	table_index,
		session_endpoint_t *	sep,
		u8	use_rules
	)

Lookup listener for session endpoint in table.

Parameters

table_index	table where the endpoint should be looked up
sep	session endpoint to be looked up
use_rules	flag that indicates if the session rules of the table should be used

Returns

invalid handle if nothing is found, the handle of a valid listener or an action derived handle if a rule is hit

Definition at line 472 of file session_lookup.c.

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u32 session_lookup_get_index_for_fib	(	u32	fib_proto,
		u32	fib_index
	)

Definition at line 245 of file session_lookup.c.

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transport_connection_t* session_lookup_half_open_connection	(	u64	handle,
		u8	proto,
		u8	is_ip4
	)

Definition at line 849 of file session_lookup.c.

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u64 session_lookup_half_open_handle

(

transport_connection_t *

tc

)

Definition at line 818 of file session_lookup.c.

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void session_lookup_init

(

void

)

Definition at line 1658 of file session_lookup.c.

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stream_session_t* session_lookup_listener	(	u32	table_index,
		session_endpoint_t *	sep
	)

Lookup listener, exact or proxy (inaddr_any:0) match.

Definition at line 752 of file session_lookup.c.

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stream_session_t* session_lookup_listener4	(	u32	fib_index,
		ip4_address_t *	lcl,
		u16	lcl_port,
		u8	proto
	)

Definition at line 693 of file session_lookup.c.

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static stream_session_t* session_lookup_listener4_i ( session_table_t *  st, ip4_address_t *  lcl, u16  lcl_port, u8  proto, u8  use_wildcard  )

inlinestatic

Definition at line 650 of file session_lookup.c.

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stream_session_t* session_lookup_listener6	(	u32	fib_index,
		ip6_address_t *	lcl,
		u16	lcl_port,
		u8	proto
	)

Definition at line 738 of file session_lookup.c.

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static stream_session_t* session_lookup_listener6_i ( session_table_t *  st, ip6_address_t *  lcl, u16  lcl_port, u8  proto, u8  ip_wildcard  )

static

Definition at line 704 of file session_lookup.c.

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u64 session_lookup_local_endpoint	(	u32	table_index,
		session_endpoint_t *	sep
	)

Look up endpoint in local session table.

The result, for now, is an application index and it may in the future be extended to a more complicated "action object". The only action we emulate now is "drop" and for that we return a special app index.

Lookup logic is to check in order:

• the rules in the table (connect acls)
• session sub-table for a listener
• session sub-table for a local listener (zeroed addr)

Parameters

table_index	table where the lookup should be done
sep	session endpoint to be looked up

Returns

session handle that can be interpreted as an adjacency

Definition at line 544 of file session_lookup.c.

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stream_session_t* session_lookup_rules_table_session4	(	session_table_t *	st,
		u8	proto,
		ip4_address_t *	lcl,
		u16	lcl_port,
		ip4_address_t *	rmt,
		u16	rmt_port
	)

UNUSED.

Definition at line 432 of file session_lookup.c.

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stream_session_t* session_lookup_rules_table_session6	(	session_table_t *	st,
		u8	proto,
		ip6_address_t *	lcl,
		u16	lcl_port,
		ip6_address_t *	rmt,
		u16	rmt_port
	)

UNUSED.

Definition at line 448 of file session_lookup.c.

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stream_session_t* session_lookup_safe4	(	u32	fib_index,
		ip4_address_t *	lcl,
		ip4_address_t *	rmt,
		u16	lcl_port,
		u16	rmt_port,
		u8	proto
	)

Lookup session with ip4 and transport layer information.

Important note: this may look into another thread's pool table and register as 'peeker'. Caller should call session_pool_remove_peeker as if needed as soon as possible.

Lookup logic is similar to that of session_lookup_connection_wt4 but this returns a session as opposed to a transport connection and it does not try to lookup half-open sessions.

Typically used by dgram connections

Definition at line 1037 of file session_lookup.c.

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stream_session_t* session_lookup_safe6	(	u32	fib_index,
		ip6_address_t *	lcl,
		ip6_address_t *	rmt,
		u16	lcl_port,
		u16	rmt_port,
		u8	proto
	)

Lookup session with ip6 and transport layer information.

Important note: this may look into another thread's pool table and register as 'peeker'. Caller should call session_pool_remove_peeker as if needed as soon as possible.

Lookup logic is similar to that of session_lookup_connection_wt6 but this returns a session as opposed to a transport connection and it does not try to lookup half-open sessions.

Typically used by dgram connections

Definition at line 1237 of file session_lookup.c.

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void session_lookup_set_tables_appns

(

app_namespace_t *

app_ns

)

Mark (global) tables as pertaining to app ns.

Definition at line 1320 of file session_lookup.c.

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void session_lookup_show_table_entries	(	vlib_main_t *	vm,
		session_table_t *	table,
		u8	type,
		u8	is_local
	)

Definition at line 1382 of file session_lookup.c.

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

static

Definition at line 1406 of file session_lookup.c.

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static session_table_t* session_table_get_for_connection ( transport_connection_t *  tc )

static

Definition at line 227 of file session_lookup.c.

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static session_table_t* session_table_get_for_fib_index ( u32  fib_proto, u32  fib_index  )

static

Definition at line 237 of file session_lookup.c.

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static session_table_t* session_table_get_or_alloc ( u8  fib_proto, u8  fib_index  )

static

Definition at line 197 of file session_lookup.c.

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static session_table_t* session_table_get_or_alloc_for_connection ( transport_connection_t *  tc )

static

Definition at line 219 of file session_lookup.c.

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

static

Definition at line 1553 of file session_lookup.c.

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clib_error_t* vnet_session_rule_add_del

(

session_rule_add_del_args_t *

args

)

Definition at line 1273 of file session_lookup.c.

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Variable Documentation

u32* fib_index_to_table_index[2]

static

Network namespace index (i.e., fib index) to session lookup table.

We should have one per network protocol type but for now we only support IP4/6

Definition at line 41 of file session_lookup.c.

vlib_cli_command_t session_rule_command

static

Initial value:

=
{
  .path = "session rule",
  .short_help = "session rule [add|del] appns <ns_id> proto <proto> "
      "<lcl-ip/plen> <lcl-port> <rmt-ip/plen> <rmt-port> action <action>",
  .function = session_rule_command_fn,
}

(constructor) VLIB_CLI_COMMAND (session_rule_command)

Definition at line 1519 of file session_lookup.c.

vlib_cli_command_t show_session_rules_command

static

Initial value:

=
{
  .path = "show session rules",
  .short_help = "show session rules [<proto> appns <id> <lcl-ip/plen> "
      "<lcl-port> <rmt-ip/plen> <rmt-port> scope <scope>]",
  .function = show_session_rules_command_fn,
}

(constructor) VLIB_CLI_COMMAND (show_session_rules_command)

Definition at line 1648 of file session_lookup.c.

transport_proto_vft_t* tp_vfts

Generate typed init functions for multiple hash table styles...

External vector of per transport virtual functions table

Generate typed init functions for multiple hash table styles...

Definition at line 23 of file transport.c.

v6_connection_key_t

Definition at line 79 of file session_lookup.c.