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nexedi
babeld
Commits
675dc627
Commit
675dc627
authored
Sep 03, 2013
by
Baptiste Jonglez
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Compute the RTT to a neighbour
To do this, we use the timestamps piggybacked on Hello and IHU messages.
parent
c7c5578c
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1
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23 additions
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2 deletions
+23
-2
message.c
message.c
+23
-2
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message.c
View file @
675dc627
...
@@ -280,6 +280,7 @@ parse_packet(const unsigned char *from, struct interface *ifp,
...
@@ -280,6 +280,7 @@ parse_packet(const unsigned char *from, struct interface *ifp,
have_v4_nh
=
0
,
have_v6_nh
=
0
;
have_v4_nh
=
0
,
have_v6_nh
=
0
;
unsigned
char
router_id
[
8
],
v4_prefix
[
16
],
v6_prefix
[
16
],
unsigned
char
router_id
[
8
],
v4_prefix
[
16
],
v6_prefix
[
16
],
v4_nh
[
16
],
v6_nh
[
16
];
v4_nh
[
16
],
v6_nh
[
16
];
int
have_hello_rtt
=
0
;
/* Content of the RTT sub-TLV on IHU messages. */
/* Content of the RTT sub-TLV on IHU messages. */
unsigned
int
hello_send_us
=
0
,
hello_rtt_receive_time
=
0
;
unsigned
int
hello_send_us
=
0
,
hello_rtt_receive_time
=
0
;
...
@@ -369,8 +370,10 @@ parse_packet(const unsigned char *from, struct interface *ifp,
...
@@ -369,8 +370,10 @@ parse_packet(const unsigned char *from, struct interface *ifp,
/* Multiply by 3/2 to allow hellos to expire. */
/* Multiply by 3/2 to allow hellos to expire. */
schedule_neighbours_check
(
interval
*
15
,
0
);
schedule_neighbours_check
(
interval
*
15
,
0
);
/* Sub-TLV handling. */
/* Sub-TLV handling. */
if
(
len
>
8
)
if
(
len
>
8
)
{
parse_hello_subtlv
(
message
+
8
,
len
-
6
,
neigh
);
if
(
parse_hello_subtlv
(
message
+
8
,
len
-
6
,
neigh
)
>
0
)
have_hello_rtt
=
1
;
}
}
else
if
(
type
==
MESSAGE_IHU
)
{
}
else
if
(
type
==
MESSAGE_IHU
)
{
unsigned
short
txcost
,
interval
;
unsigned
short
txcost
,
interval
;
unsigned
char
address
[
16
];
unsigned
char
address
[
16
];
...
@@ -590,6 +593,24 @@ parse_packet(const unsigned char *from, struct interface *ifp,
...
@@ -590,6 +593,24 @@ parse_packet(const unsigned char *from, struct interface *ifp,
message
[
0
],
message
[
1
],
format_address
(
from
),
ifp
->
name
);
message
[
0
],
message
[
1
],
format_address
(
from
),
ifp
->
name
);
goto
done
;
goto
done
;
}
}
/* We can calculate the RTT to this neighbour. */
if
(
have_hello_rtt
&&
hello_send_us
&&
hello_rtt_receive_time
)
{
int
remote_waiting_us
,
local_waiting_us
;
int
rtt
;
remote_waiting_us
=
neigh
->
hello_send_us
-
hello_rtt_receive_time
;
local_waiting_us
=
time_us
(
neigh
->
hello_rtt_receive_time
)
-
hello_send_us
;
/* Sanity checks (validity window of 10 minutes). */
if
(
remote_waiting_us
<
0
||
local_waiting_us
<
0
||
remote_waiting_us
>
600000000
||
local_waiting_us
>
600000000
)
return
;
rtt
=
local_waiting_us
-
remote_waiting_us
;
debugf
(
"RTT to %s on %s sample result: %d us.
\n
"
,
format_address
(
from
),
ifp
->
name
,
rtt
);
}
return
;
return
;
}
}
...
...
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