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ospfd/ospfclient: add option to flush/withdrawal with zero length

Browse source 
default behavior is unchanged, i.e., to not zero

Signed-off-by: Lou Berger <lberger@labn.net>
This commit is contained in:
Lou Berger 2022-10-16 15:19:37 +00:00
parent 08172828f6
commit 2f30cb2574
10 changed files with 70 additions and 27 deletions
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5
ospfclient/ospf_apiclient.c
View file

@ -482,7 +482,8 @@ int ospf_apiclient_lsa_originate(struct ospf_apiclient *oclient,
int ospf_apiclient_lsa_delete(struct ospf_apiclient *oclient,
struct in_addr addr, uint8_t lsa_type,
uint8_t opaque_type, uint32_t opaque_id)
uint8_t opaque_type, uint32_t opaque_id,
uint8_t flags)
{
struct msg *msg;
int rc;
@ -497,7 +498,7 @@ int ospf_apiclient_lsa_delete(struct ospf_apiclient *oclient,
/* opaque_id is in host byte order and will be converted
* to network byte order by new_msg_delete_request */
msg = new_msg_delete_request(ospf_apiclient_get_seqnr(), addr, lsa_type,
opaque_type, opaque_id);
opaque_type, opaque_id, flags);
rc = ospf_apiclient_send_request(oclient, msg);
return rc;

3
ospfclient/ospf_apiclient.h
View file

@ -95,7 +95,8 @@ int ospf_apiclient_lsa_originate(struct ospf_apiclient *oclient,
host byte order */
int ospf_apiclient_lsa_delete(struct ospf_apiclient *oclient,
struct in_addr addr, uint8_t lsa_type,
uint8_t opaque_type, uint32_t opaque_id);
uint8_t opaque_type, uint32_t opaque_id,
uint8_t flags);
/* Fetch async message and handle it */
int ospf_apiclient_handle_async(struct ospf_apiclient *oclient);

7
ospfclient/ospfclient.c
View file

@ -98,9 +98,10 @@ static void lsa_delete(struct thread *t)
printf("Deleting LSA... ");
rc = ospf_apiclient_lsa_delete(oclient, area_id,
atoi(args[2]), /* lsa type */
atoi(args[3]), /* opaque type */
atoi(args[4])); /* opaque ID */
atoi(args[2]), /* lsa type */
atoi(args[3]), /* opaque type */
atoi(args[4]), /* opaque ID */
0); /* send data in withdrawals */
printf("done, return code is = %d\n", rc);
}

45
ospfclient/ospfclient.py
View file

@ -62,13 +62,16 @@ smsg_info = {
MSG_REGISTER_EVENT: ("REGISTER_EVENT", FMT_LSA_FILTER),
MSG_SYNC_LSDB: ("SYNC_LSDB", FMT_LSA_FILTER),
MSG_ORIGINATE_REQUEST: ("ORIGINATE_REQUEST", ">II" + FMT_LSA_HEADER[1:]),
MSG_DELETE_REQUEST: ("DELETE_REQUEST", ">IBBxxL"),
MSG_DELETE_REQUEST: ("DELETE_REQUEST", ">IBBxBL"),
MSG_SYNC_REACHABLE: ("MSG_SYNC_REACHABLE", ""),
MSG_SYNC_ISM: ("MSG_SYNC_ISM", ""),
MSG_SYNC_NSM: ("MSG_SYNC_NSM", ""),
MSG_SYNC_ROUTER_ID: ("MSG_SYNC_ROUTER_ID", ""),
}
# OSPF API MSG Delete Flag.
OSPF_API_DEL_ZERO_LEN_LSA = 0x01 # send withdrawal with no LSA data
# --------------------------
# Messages from OSPF daemon.
# --------------------------
@ -842,7 +845,7 @@ class OspfOpaqueClient(OspfApiClient):
await self._assure_opaque_ready(lsa_type, otype)
await self.msg_send_raises(mt, msg)
async def delete_opaque_data(self, addr, lsa_type, otype, oid):
async def delete_opaque_data(self, addr, lsa_type, otype, oid, flags=0):
"""Delete an instance of opaque data.
Delete an instance of opaque data. This call will register for the given
@ -854,6 +857,7 @@ class OspfOpaqueClient(OspfApiClient):
otype: (octet) opaque type. Note: the type will be registered if the user
has not explicity done that yet with `register_opaque_data`.
oid: (3 octets) ID of this opaque data
flags: (octet) optional flags (e.g., OSPF_API_DEL_ZERO_LEN_LSA, defaults to no flags)
Raises:
See `msg_send_raises`
"""
@ -862,7 +866,7 @@ class OspfOpaqueClient(OspfApiClient):
mt = MSG_DELETE_REQUEST
await self._assure_opaque_ready(lsa_type, otype)
mp = struct.pack(msg_fmt[mt], int(addr), lsa_type, otype, oid)
mp = struct.pack(msg_fmt[mt], int(addr), lsa_type, otype, flags, oid)
await self.msg_send_raises(mt, mp)
async def register_opaque_data(self, lsa_type, otype, callback=None):
@ -1115,23 +1119,28 @@ async def async_main(args):
except ValueError:
addr = ip(aval)
oargs = [addr, ltype, int(_s.pop(False)), int(_s.pop(False))]
assert len(_s) <= 1, "Bad format for action argument"
try:
b = bytes.fromhex(_s.pop(False))
except IndexError:
b = b""
logging.info("opaque data is %s octets", len(b))
# Needs to be multiple of 4 in length
mod = len(b) % 4
if mod:
b += b"\x00" * (4 - mod)
logging.info("opaque padding to %s octets", len(b))
if what.casefold() == "add":
try:
b = bytes.fromhex(_s.pop(False))
except IndexError:
b = b""
logging.info("opaque data is %s octets", len(b))
# Needs to be multiple of 4 in length
mod = len(b) % 4
if mod:
b += b"\x00" * (4 - mod)
logging.info("opaque padding to %s octets", len(b))
await c.add_opaque_data(*oargs, b)
else:
assert what.casefold().startswith("del")
await c.delete_opaque_data(*oargs)
f = 0
if len(_s) >= 1:
try:
f = int(_s.pop(False))
except IndexError:
f = 0
await c.delete_opaque_data(*oargs, f)
if args.exit:
return 0
except Exception as error:
@ -1153,7 +1162,9 @@ def main(*args):
ap.add_argument("--server", default="localhost", help="OSPF API server")
ap.add_argument("-v", "--verbose", action="store_true", help="be verbose")
ap.add_argument(
"actions", nargs="*", help="(ADD|DEL),LSATYPE,[ADDR,],OTYPE,OID,[HEXDATA]"
"actions",
nargs="*",
help="(ADD|DEL),LSATYPE,[ADDR,],OTYPE,OID,[HEXDATA|DEL_FLAG]",
)
args = ap.parse_args()

3
ospfd/ospf_api.c
View file

@ -534,7 +534,7 @@ struct msg *new_msg_originate_request(uint32_t seqnum, struct in_addr ifaddr,
struct msg *new_msg_delete_request(uint32_t seqnum, struct in_addr addr,
uint8_t lsa_type, uint8_t opaque_type,
uint32_t opaque_id)
uint32_t opaque_id, uint8_t flags)
{
struct msg_delete_request dmsg;
dmsg.addr = addr;
@ -542,6 +542,7 @@ struct msg *new_msg_delete_request(uint32_t seqnum, struct in_addr addr,
dmsg.opaque_type = opaque_type;
dmsg.opaque_id = htonl(opaque_id);
memset(&dmsg.pad, 0, sizeof(dmsg.pad));
dmsg.flags = flags;
return msg_new(MSG_DELETE_REQUEST, &dmsg, seqnum,
sizeof(struct msg_delete_request));

14
ospfd/ospf_api.h
View file

@ -185,11 +185,19 @@ struct msg_originate_request {
struct lsa_header data;
};
/* OSPF API MSG Delete Flag. */
#define OSPF_API_DEL_ZERO_LEN_LSA 0x01 /* send withdrawal with no LSA data */
#define IS_DEL_ZERO_LEN_LSA(x) ((x)->flags & OSPF_API_DEL_ZERO_LEN_LSA)
struct msg_delete_request {
struct in_addr addr; /* intf IP for link local, area for type 10, "0.0.0.0" for AS-external */
struct in_addr addr; /* intf IP for link local, area for type 10,
"0.0.0.0" for AS-external */
uint8_t lsa_type;
uint8_t opaque_type;
uint8_t pad[2]; /* padding */
uint8_t pad; /* padding */
uint8_t flags; /* delete flags */
uint32_t opaque_id;
};
@ -313,7 +321,7 @@ extern struct msg *new_msg_originate_request(uint32_t seqnum,
struct lsa_header *data);
extern struct msg *new_msg_delete_request(uint32_t seqnum, struct in_addr addr,
uint8_t lsa_type, uint8_t opaque_type,
uint32_t opaque_id);
uint32_t opaque_id, uint8_t flags);
/* Messages sent by OSPF daemon */
extern struct msg *new_msg_reply(uint32_t seqnum, uint8_t rc);

5
ospfd/ospf_apiserver.c
View file

@ -1997,6 +1997,11 @@ int ospf_apiserver_handle_delete_request(struct ospf_apiserver *apiserv,
goto out;
}
if (IS_DEL_ZERO_LEN_LSA(dmsg)) {
/* minimize the size of the withdrawal: */
old->opaque_zero_len_delete = 1;
}
/* Schedule flushing of LSA from LSDB */
/* NB: Multiple scheduling will produce a warning message, but harmless.
*/

1
ospfd/ospf_lsa.c
View file

@ -190,6 +190,7 @@ struct ospf_lsa *ospf_lsa_new(void)
new->refresh_list = -1;
new->vrf_id = VRF_DEFAULT;
new->to_be_acknowledged = 0;
new->opaque_zero_len_delete = 0;
return new;
}

3
ospfd/ospf_lsa.h
View file

@ -124,6 +124,9 @@ struct ospf_lsa {
/*For topo chg detection in HELPER role*/
bool to_be_acknowledged;
/* send maxage with no data */
bool opaque_zero_len_delete;
};
/* OSPF LSA Link Type. */

11
ospfd/ospf_opaque.c
View file

@ -2050,6 +2050,17 @@ void ospf_opaque_lsa_flush_schedule(struct ospf_lsa *lsa0)
goto out;
}
if (lsa->opaque_zero_len_delete &&
lsa->data->length != htons(sizeof(struct lsa_header))) {
/* minimize the size of the withdrawal: */
/* increment the sequence number and make len just header */
/* and update checksum */
lsa->data->ls_seqnum = lsa_seqnum_increment(lsa);
lsa->data->length = htons(sizeof(struct lsa_header));
lsa->data->checksum = 0;
lsa->data->checksum = ospf_lsa_checksum(lsa->data);
}
/* Delete this lsa from neighbor retransmit-list. */
switch (lsa->data->type) {
case OSPF_OPAQUE_LINK_LSA: