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isisd: Add support for isis hello padding sometimes

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New configuration to pad ISIS hello packets during adjacency formation only.

Signed-off-by: Diogo Oliveira <14191454+dorDiogo@users.noreply.github.com>
This commit is contained in:
Diogo Oliveira 2023-01-20 17:08:45 -08:00
parent 617d2b71c0
commit e36ec6acbc
9 changed files with 100 additions and 30 deletions
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34
isisd/isis_circuit.c
View File

@ -107,7 +107,7 @@ struct isis_circuit *isis_circuit_new(struct interface *ifp, const char *tag)
"/frr-interface:lib/interface/frr-isisd:isis/circuit-type");
circuit->flags = 0;
circuit->pad_hellos = yang_get_default_bool(
circuit->pad_hellos = yang_get_default_enum(
"/frr-interface:lib/interface/frr-isisd:isis/hello/padding");
circuit->hello_interval[0] = yang_get_default_uint32(
"/frr-interface:lib/interface/frr-isisd:isis/hello/interval/level-1");
@ -145,7 +145,7 @@ struct isis_circuit *isis_circuit_new(struct interface *ifp, const char *tag)
#else
circuit->is_type_config = IS_LEVEL_1_AND_2;
circuit->flags = 0;
circuit->pad_hellos = 1;
circuit->pad_hellos = ISIS_HELLO_PADDING_ALWAYS;
for (i = 0; i < 2; i++) {
circuit->hello_interval[i] = DEFAULT_HELLO_INTERVAL;
circuit->hello_multiplier[i] = DEFAULT_HELLO_MULTIPLIER;
@ -1029,7 +1029,8 @@ void isis_circuit_print_json(struct isis_circuit *circuit,
circuit->hello_multiplier[0]);
json_object_string_add(
hold_json, "pad",
(circuit->pad_hellos ? "yes" : "no"));
isis_hello_padding2string(
circuit->pad_hellos));
json_object_int_add(level_json, "cnsp-interval",
circuit->csnp_interval[0]);
json_object_int_add(level_json, "psnp-interval",
@ -1137,11 +1138,11 @@ void isis_circuit_print_vty(struct isis_circuit *circuit, struct vty *vty,
vty_out(vty, ", Active neighbors: %u\n",
circuit->upadjcount[0]);
vty_out(vty,
" Hello interval: %u, Holddown count: %u %s\n",
" Hello interval: %u, Holddown count: %u, Padding: %s\n",
circuit->hello_interval[0],
circuit->hello_multiplier[0],
(circuit->pad_hellos ? "(pad)"
: "(no-pad)"));
isis_hello_padding2string(
circuit->pad_hellos));
vty_out(vty,
" CNSP interval: %u, PSNP interval: %u\n",
circuit->csnp_interval[0],
@ -1169,11 +1170,11 @@ void isis_circuit_print_vty(struct isis_circuit *circuit, struct vty *vty,
vty_out(vty, ", Active neighbors: %u\n",
circuit->upadjcount[1]);
vty_out(vty,
" Hello interval: %u, Holddown count: %u %s\n",
" Hello interval: %u, Holddown count: %u, Padding: %s\n",
circuit->hello_interval[1],
circuit->hello_multiplier[1],
(circuit->pad_hellos ? "(pad)"
: "(no-pad)"));
isis_hello_padding2string(
circuit->pad_hellos));
vty_out(vty,
" CNSP interval: %u, PSNP interval: %u\n",
circuit->csnp_interval[1],
@ -1319,11 +1320,20 @@ static int isis_interface_config_write(struct vty *vty)
}
}
/* ISIS - Hello padding - Defaults to true so only
* display if false */
if (circuit->pad_hellos == 0) {
/* ISIS - Hello padding - Defaults to always so only
* display if not always */
switch (circuit->pad_hellos) {
case ISIS_HELLO_PADDING_DISABLED:
vty_out(vty, " no " PROTO_NAME " hello padding\n");
write++;
break;
case ISIS_HELLO_PADDING_SOMETIMES:
vty_out(vty, PROTO_NAME
" hello padding sometimes\n");
write++;
break;
case ISIS_HELLO_PADDING_ALWAYS:
break;
}
if (circuit->disable_threeway_adj) {

11
isisd/isis_circuit.h
View File

@ -63,6 +63,15 @@ struct isis_circuit_arg {
struct isis_circuit *circuit;
};
/*
* Hello padding types
*/
enum isis_hello_padding {
ISIS_HELLO_PADDING_ALWAYS,
ISIS_HELLO_PADDING_DISABLED,
ISIS_HELLO_PADDING_SOMETIMES
};
struct isis_circuit {
enum isis_circuit_state state;
uint8_t circuit_id; /* l1/l2 bcast CircuitID */
@ -100,7 +109,7 @@ struct isis_circuit {
struct isis_p2p_info p2p;
} u;
uint8_t priority[ISIS_LEVELS]; /* l1/2 IS configured priority */
int pad_hellos; /* add padding to Hello PDUs ? */
enum isis_hello_padding pad_hellos; /* type of Hello PDUs padding */
char ext_domain; /* externalDomain (boolean) */
int lsp_regenerate_pending[ISIS_LEVELS];
uint64_t lsp_error_counter;

32
isisd/isis_cli.c
View File

@ -2239,15 +2239,22 @@ void cli_show_ip_isis_threeway_shake(struct vty *vty,
/*
* XPath: /frr-interface:lib/interface/frr-isisd:isis/hello/padding
*/
DEFPY_YANG(isis_hello_padding, isis_hello_padding_cmd, "[no] isis hello padding",
NO_STR
"IS-IS routing protocol\n"
"Add padding to IS-IS hello packets\n"
"Pad hello packets\n")
DEFPY_YANG(isis_hello_padding, isis_hello_padding_cmd,
"[no] isis hello padding [sometimes]$padding_type",
NO_STR
"IS-IS routing protocol\n"
"Type of padding for IS-IS hello packets\n"
"Pad hello packets\n"
"Add padding to hello packets during adjacency formation only.\n")
{
nb_cli_enqueue_change(vty, "./frr-isisd:isis/hello/padding",
NB_OP_MODIFY, no ? "false" : "true");
if (no) {
nb_cli_enqueue_change(vty, "./frr-isisd:isis/hello/padding",
NB_OP_MODIFY, "disabled");
} else {
nb_cli_enqueue_change(vty, "./frr-isisd:isis/hello/padding",
NB_OP_MODIFY,
padding_type ? padding_type : "always");
}
return nb_cli_apply_changes(vty, NULL);
}
@ -2255,10 +2262,13 @@ void cli_show_ip_isis_hello_padding(struct vty *vty,
const struct lyd_node *dnode,
bool show_defaults)
{
if (!yang_dnode_get_bool(dnode, NULL))
int hello_padding_type = yang_dnode_get_enum(dnode, NULL);
if (hello_padding_type == ISIS_HELLO_PADDING_DISABLED)
vty_out(vty, " no");
vty_out(vty, " isis hello padding\n");
vty_out(vty, " isis hello padding");
if (hello_padding_type == ISIS_HELLO_PADDING_SOMETIMES)
vty_out(vty, " sometimes");
vty_out(vty, "\n");
}
/*

13
isisd/isis_misc.c
View File

@ -294,6 +294,19 @@ const char *syst2string(int type)
return NULL; /* not reached */
}
const char *isis_hello_padding2string(int hello_padding_type)
{
switch (hello_padding_type) {
case ISIS_HELLO_PADDING_DISABLED:
return "no";
case ISIS_HELLO_PADDING_SOMETIMES:
return "sometimes";
case ISIS_HELLO_PADDING_ALWAYS:
return "yes";
}
return NULL; /* not reached */
}
/*
* Print functions - we print to static vars
*/

1
isisd/isis_misc.h
View File

@ -16,6 +16,7 @@ const char *circuit_t2string(int);
const char *circuit_state2string(int state);
const char *circuit_type2string(int type);
const char *syst2string(int);
const char *isis_hello_padding2string(int hello_padding_type);
struct in_addr newprefix2inaddr(uint8_t *prefix_start, uint8_t prefix_masklen);
/*
* Converting input to memory stored format

2
isisd/isis_nb_config.c
View File

@ -2765,7 +2765,7 @@ int lib_interface_isis_hello_padding_modify(struct nb_cb_modify_args *args)
return NB_OK;
circuit = nb_running_get_entry(args->dnode, NULL, true);
circuit->pad_hellos = yang_dnode_get_bool(args->dnode, NULL);
circuit->pad_hellos = yang_dnode_get_enum(args->dnode, NULL);
return NB_OK;
}

7
isisd/isis_pdu.c
View File

@ -1964,8 +1964,13 @@ int send_hello(struct isis_circuit *circuit, int level)
isis_tlvs_add_global_ipv6_addresses(tlvs,
circuit->ipv6_non_link);
bool should_pad_hello =
circuit->pad_hellos == ISIS_HELLO_PADDING_ALWAYS ||
(circuit->pad_hellos == ISIS_HELLO_PADDING_SOMETIMES &&
circuit->upadjcount[0] + circuit->upadjcount[1] == 0);
if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
circuit->pad_hellos, false)) {
should_pad_hello, false)) {
isis_free_tlvs(tlvs);
return ISIS_WARNING; /* XXX: Maybe Log TLV structure? */
}

4
isisd/isis_snmp.c
View File

@ -2161,7 +2161,9 @@ static uint8_t *isis_snmp_find_circ(struct variable *v, oid *name,
/*
* return false if lan hellos must be padded
*/
if (circuit->pad_hellos)
if (circuit->pad_hellos == ISIS_HELLO_PADDING_ALWAYS ||
(circuit->pad_hellos == ISIS_HELLO_PADDING_SOMETIMES &&
circuit->upadjcount[0] + circuit->upadjcount[1] == 0))
return SNMP_INTEGER(ISIS_SNMP_TRUTH_VALUE_FALSE);
return SNMP_INTEGER(ISIS_SNMP_TRUTH_VALUE_TRUE);

26
yang/frr-isisd.yang
View File

@ -116,6 +116,26 @@ module frr-isisd {
associated with an interface.";
}
typedef hello-padding-type {
type enumeration {
enum "always" {
value 0;
description
"Add padding to all hello packets.";
}
enum "disabled" {
value 1;
description
"Do not add any padding to hello packets.";
}
enum "sometimes" {
value 2;
description
"Add padding to hello packets during adjacency formation only.";
}
}
}
typedef network-type {
type enumeration {
enum "unknown" {
@ -605,10 +625,10 @@ module frr-isisd {
description
"Parameters related to IS-IS hello PDUs.";
leaf padding {
type boolean;
default "true";
type hello-padding-type;
default "always";
description
"Add padding to IS-IS hello PDUs.";
"Type of padding for IS-IS hello packets.";
}
container interval {